diff --git a/app/controllers/api/v1/coupons_controller.rb b/app/controllers/api/v1/coupons_controller.rb
index b157b82052c..0776002ec57 100644
--- a/app/controllers/api/v1/coupons_controller.rb
+++ b/app/controllers/api/v1/coupons_controller.rb
@@ -6,10 +6,7 @@ class CouponsController < Api::BaseController
       def create
         service = Coupons::CreateService.new
         result = service.create(
-          CouponLegacyInput.new(
-            current_organization,
-            input_params.merge(organization_id: current_organization.id)
-          ).create_input
+          input_params.merge(organization_id: current_organization.id).to_h
         )
 
         if result.success?
@@ -24,10 +21,7 @@ def update
 
         result = Coupons::UpdateService.call(
           coupon:,
-          params: CouponLegacyInput.new(
-            current_organization,
-            input_params
-          ).update_input
+          params: input_params.to_h
         )
 
         if result.success?
@@ -89,8 +83,6 @@ def input_params
           :frequency_duration,
           :expiration,
           :expiration_at,
-          # NOTE: Legacy field
-          :expiration_date,
           :reusable,
           applies_to: [
             plan_codes: [],
diff --git a/app/controllers/api/v1/customers_controller.rb b/app/controllers/api/v1/customers_controller.rb
index cfee3d39b5f..766476d7e68 100644
--- a/app/controllers/api/v1/customers_controller.rb
+++ b/app/controllers/api/v1/customers_controller.rb
@@ -127,9 +127,6 @@ def create_params
             :sync,
             :sync_with_provider,
             :document_locale,
-
-            # NOTE(legacy): vat has been moved to tax model
-            :vat_rate,
             provider_payment_methods: []
           ],
           metadata: [
diff --git a/app/controllers/api/v1/organizations_controller.rb b/app/controllers/api/v1/organizations_controller.rb
index b5f00e08bab..ba957c62b30 100644
--- a/app/controllers/api/v1/organizations_controller.rb
+++ b/app/controllers/api/v1/organizations_controller.rb
@@ -69,10 +69,7 @@ def input_params
           billing_configuration: [
             :invoice_footer,
             :invoice_grace_period,
-            :document_locale,
-
-            # NOTE(legacy): vat has been moved to tax model
-            :vat_rate
+            :document_locale
           ]
         )
       end
diff --git a/app/controllers/api/v1/subscriptions_controller.rb b/app/controllers/api/v1/subscriptions_controller.rb
index e4d44469a96..da97a5072b7 100644
--- a/app/controllers/api/v1/subscriptions_controller.rb
+++ b/app/controllers/api/v1/subscriptions_controller.rb
@@ -17,10 +17,7 @@ def create
         result = Subscriptions::CreateService.call(
           customer:,
           plan:,
-          params: SubscriptionLegacyInput.new(
-            current_organization,
-            create_params
-          ).create_input
+          params: create_params.to_h
         )
 
         if result.success?
@@ -64,10 +61,7 @@ def update
 
         result = Subscriptions::UpdateService.call(
           subscription:,
-          params: SubscriptionLegacyInput.new(
-            current_organization,
-            update_params
-          ).update_input
+          params: update_params.to_h
         )
 
         if result.success?
diff --git a/app/controllers/api/v1/wallets_controller.rb b/app/controllers/api/v1/wallets_controller.rb
index 1beafd8887a..f93511a4dbb 100644
--- a/app/controllers/api/v1/wallets_controller.rb
+++ b/app/controllers/api/v1/wallets_controller.rb
@@ -5,12 +5,9 @@ module V1
     class WalletsController < Api::BaseController
       def create
         result = Wallets::CreateService.call(
-          params: WalletLegacyInput.new(
-            current_organization,
-            input_params
-              .merge(organization_id: current_organization.id)
-              .merge(customer:).to_h.deep_symbolize_keys
-          ).create_input
+          params: input_params
+            .merge(organization_id: current_organization.id)
+            .merge(customer:).to_h.deep_symbolize_keys
         )
 
         if result.success?
@@ -23,10 +20,7 @@ def create
       def update
         result = Wallets::UpdateService.call(
           wallet: current_organization.wallets.find_by(id: params[:id]),
-          params: WalletLegacyInput.new(
-            current_organization,
-            update_params.merge(id: params[:id]).to_h.deep_symbolize_keys
-          ).update_input
+          params: update_params.merge(id: params[:id]).to_h.deep_symbolize_keys
         )
 
         if result.success?
@@ -86,7 +80,6 @@ def input_params
           :paid_credits,
           :granted_credits,
           :expiration_at,
-          :expiration_date, # NOTE: Legacy field
           recurring_transaction_rules: [
             :granted_credits,
             :interval,
@@ -108,7 +101,6 @@ def update_params
         params.require(:wallet).permit(
           :name,
           :expiration_at,
-          :expiration_date, # NOTE: Legacy field
           recurring_transaction_rules: [
             :lago_id,
             :interval,
diff --git a/app/graphql/types/organizations/base_organization_type.rb b/app/graphql/types/organizations/base_organization_type.rb
index 1fc9aca4f6b..ba7b42d31a3 100644
--- a/app/graphql/types/organizations/base_organization_type.rb
+++ b/app/graphql/types/organizations/base_organization_type.rb
@@ -6,7 +6,6 @@ class BaseOrganizationType < BaseObject
       def billing_configuration
         {
           id: "#{object&.id}-c0nf", # Each nested object needs ID so that appollo cache system can work properly
-          vat_rate: object&.vat_rate,
           invoice_footer: object&.invoice_footer,
           invoice_grace_period: object&.invoice_grace_period,
           document_locale: object&.document_locale,
diff --git a/app/graphql/types/organizations/billing_configuration.rb b/app/graphql/types/organizations/billing_configuration.rb
index 59fbadbb947..287c4292fbf 100644
--- a/app/graphql/types/organizations/billing_configuration.rb
+++ b/app/graphql/types/organizations/billing_configuration.rb
@@ -9,7 +9,6 @@ class BillingConfiguration < Types::BaseObject
       field :id, ID, null: false
       field :invoice_footer, String
       field :invoice_grace_period, Integer, null: false
-      field :vat_rate, Float, null: false
     end
   end
 end
diff --git a/app/legacy_inputs/coupon_legacy_input.rb b/app/legacy_inputs/coupon_legacy_input.rb
deleted file mode 100644
index 85b1454bac3..00000000000
--- a/app/legacy_inputs/coupon_legacy_input.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-
-class CouponLegacyInput < BaseLegacyInput
-  def create_input
-    if args[:expiration_date].present?
-      args[:expiration_at] ||= date_in_organization_timezone(args[:expiration_date], end_of_day: true)
-    end
-
-    args
-  end
-  alias_method :update_input, :create_input
-end
diff --git a/app/legacy_inputs/subscription_legacy_input.rb b/app/legacy_inputs/subscription_legacy_input.rb
deleted file mode 100644
index 3944ed05ea5..00000000000
--- a/app/legacy_inputs/subscription_legacy_input.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-
-class SubscriptionLegacyInput < BaseLegacyInput
-  def create_input
-    if args[:subscription_date].present?
-      args[:subscription_at] ||= date_in_organization_timezone(args[:subscription_date], end_of_day: false)
-    end
-
-    args
-  end
-  alias_method :update_input, :create_input
-end
diff --git a/app/legacy_inputs/wallet_legacy_input.rb b/app/legacy_inputs/wallet_legacy_input.rb
deleted file mode 100644
index f3f0381fbb7..00000000000
--- a/app/legacy_inputs/wallet_legacy_input.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-
-class WalletLegacyInput < BaseLegacyInput
-  def create_input
-    if args[:expiration_date].present?
-      args[:expiration_at] ||= date_in_organization_timezone(args[:expiration_date], end_of_day: true)
-    end
-
-    args
-  end
-  alias_method :update_input, :create_input
-end
diff --git a/app/models/customer.rb b/app/models/customer.rb
index b2f055e1791..d2a56898332 100644
--- a/app/models/customer.rb
+++ b/app/models/customer.rb
@@ -59,7 +59,6 @@ class Customer < ApplicationRecord
   validates :net_payment_term, numericality: {greater_than_or_equal_to: 0}, allow_nil: true
   validates :payment_provider, inclusion: {in: PAYMENT_PROVIDERS}, allow_nil: true
   validates :timezone, timezone: true, allow_nil: true
-  validates :vat_rate, numericality: {less_than_or_equal_to: 100, greater_than_or_equal_to: 0}, allow_nil: true
 
   def self.ransackable_attributes(_auth_object = nil)
     %w[id name external_id email]
diff --git a/app/models/organization.rb b/app/models/organization.rb
index 16d4c239521..7788cf9e0ca 100644
--- a/app/models/organization.rb
+++ b/app/models/organization.rb
@@ -67,7 +67,6 @@ class Organization < ApplicationRecord
     if: :logo?
   validates :name, presence: true
   validates :timezone, timezone: true
-  validates :vat_rate, numericality: {less_than_or_equal_to: 100, greater_than_or_equal_to: 0}
   validates :webhook_url, url: true, allow_nil: true
 
   validate :validate_email_settings
diff --git a/app/serializers/v1/applied_coupon_serializer.rb b/app/serializers/v1/applied_coupon_serializer.rb
index 7d9e68950a3..21a4bcf217c 100644
--- a/app/serializers/v1/applied_coupon_serializer.rb
+++ b/app/serializers/v1/applied_coupon_serializer.rb
@@ -23,7 +23,6 @@ def serialize
         terminated_at: model.terminated_at&.iso8601
       }
 
-      payload = payload.merge(legacy_values)
       payload = payload.merge(credits) if include?(:credits)
 
       payload
@@ -41,11 +40,5 @@ def amount_cents_remaining
     def credits
       ::CollectionSerializer.new(model.credits, ::V1::CreditSerializer, collection_name: 'credits').serialize
     end
-
-    def legacy_values
-      ::V1::Legacy::AppliedCouponSerializer.new(
-        model
-      ).serialize
-    end
   end
 end
diff --git a/app/serializers/v1/coupon_serializer.rb b/app/serializers/v1/coupon_serializer.rb
index 932a59502d4..6aea4f4a003 100644
--- a/app/serializers/v1/coupon_serializer.rb
+++ b/app/serializers/v1/coupon_serializer.rb
@@ -23,15 +23,7 @@ def serialize
         expiration: model.expiration,
         expiration_at: model.expiration_at&.iso8601,
         terminated_at: model.terminated_at&.iso8601
-      }.merge(legacy_values)
-    end
-
-    private
-
-    def legacy_values
-      ::V1::Legacy::CouponSerializer.new(
-        model
-      ).serialize
+      }
     end
   end
 end
diff --git a/app/serializers/v1/credit_note_serializer.rb b/app/serializers/v1/credit_note_serializer.rb
index f76750c0cf0..851d687fe7e 100644
--- a/app/serializers/v1/credit_note_serializer.rb
+++ b/app/serializers/v1/credit_note_serializer.rb
@@ -26,7 +26,7 @@ def serialize
         created_at: model.created_at.iso8601,
         updated_at: model.updated_at.iso8601,
         file_url: model.file_url
-      }.merge(legacy_values)
+      }
 
       payload.merge!(customer) if include?(:customer)
       payload.merge!(items) if include?(:items)
@@ -58,9 +58,5 @@ def applied_taxes
         collection_name: 'applied_taxes'
       ).serialize
     end
-
-    def legacy_values
-      ::V1::Legacy::CreditNoteSerializer.new(model).serialize
-    end
   end
 end
diff --git a/app/serializers/v1/credit_serializer.rb b/app/serializers/v1/credit_serializer.rb
index a492ef0e8f0..3f1cf85668e 100644
--- a/app/serializers/v1/credit_serializer.rb
+++ b/app/serializers/v1/credit_serializer.rb
@@ -18,13 +18,7 @@ def serialize
           lago_id: model.invoice_id,
           payment_status: model.invoice.payment_status
         }
-      }.deep_merge(legacy_values)
-    end
-
-    private
-
-    def legacy_values
-      ::V1::Legacy::CreditSerializer.new(model).serialize
+      }
     end
   end
 end
diff --git a/app/serializers/v1/customer_serializer.rb b/app/serializers/v1/customer_serializer.rb
index 9e34664fd55..c823fd0f5d6 100644
--- a/app/serializers/v1/customer_serializer.rb
+++ b/app/serializers/v1/customer_serializer.rb
@@ -31,7 +31,7 @@ def serialize
         external_salesforce_id: model.external_salesforce_id,
         billing_configuration:,
         shipping_address: model.shipping_address
-      }.merge(legacy_values.except(:billing_configuration))
+      }
 
       payload = payload.merge(metadata)
       payload = payload.merge(taxes) if include?(:taxes)
@@ -56,9 +56,8 @@ def billing_configuration
         invoice_grace_period: model.invoice_grace_period,
         payment_provider: model.payment_provider,
         payment_provider_code: model.payment_provider_code,
-        vat_rate: model.vat_rate,
         document_locale: model.document_locale
-      }.merge(legacy_values[:billing_configuration])
+      }
 
       case model.payment_provider&.to_sym
       when :stripe
@@ -76,10 +75,6 @@ def billing_configuration
       configuration
     end
 
-    def legacy_values
-      @legacy_values ||= ::V1::Legacy::CustomerSerializer.new(model).serialize
-    end
-
     def taxes
       ::CollectionSerializer.new(model.taxes, ::V1::TaxSerializer, collection_name: 'taxes').serialize
     end
diff --git a/app/serializers/v1/customers/usage_serializer.rb b/app/serializers/v1/customers/usage_serializer.rb
index f0f96641314..e74432f8b63 100644
--- a/app/serializers/v1/customers/usage_serializer.rb
+++ b/app/serializers/v1/customers/usage_serializer.rb
@@ -13,7 +13,7 @@ def serialize
           total_amount_cents: model.total_amount_cents,
           taxes_amount_cents: model.taxes_amount_cents,
           lago_invoice_id: nil
-        }.merge(legacy_values)
+        }
 
         payload.merge!(charges_usage) if include?(:charges_usage)
         payload
@@ -26,10 +26,6 @@ def charges_usage
           charges_usage: ::V1::Customers::ChargeUsageSerializer.new(model.fees).serialize
         }
       end
-
-      def legacy_values
-        ::V1::Legacy::Customers::UsageSerializer.new(model).serialize
-      end
     end
   end
 end
diff --git a/app/serializers/v1/event_error_serializer.rb b/app/serializers/v1/event_error_serializer.rb
index 61646696278..3d74dd44089 100644
--- a/app/serializers/v1/event_error_serializer.rb
+++ b/app/serializers/v1/event_error_serializer.rb
@@ -10,17 +10,10 @@ def serialize
       }
 
       payload.merge!(event)
-      payload.merge(legacy_values)
     end
 
     private
 
-    def legacy_values
-      ::V1::Legacy::EventErrorSerializer.new(
-        model.event
-      ).serialize
-    end
-
     def event
       {event: ::V1::EventSerializer.new(model.event).serialize}
     end
diff --git a/app/serializers/v1/fee_serializer.rb b/app/serializers/v1/fee_serializer.rb
index 8f358070f68..57b1c1be75f 100644
--- a/app/serializers/v1/fee_serializer.rb
+++ b/app/serializers/v1/fee_serializer.rb
@@ -42,7 +42,7 @@ def serialize
         failed_at: model.failed_at&.iso8601,
         refunded_at: model.refunded_at&.iso8601,
         amount_details: model.amount_details
-      }.deep_merge(legacy_values)
+      }
 
       payload.merge!(date_boundaries) if model.charge? || model.subscription?
       payload.merge!(pay_in_advance_charge_attributes) if model.pay_in_advance?
@@ -110,10 +110,6 @@ def applied_taxes
       ).serialize
     end
 
-    def legacy_values
-      ::V1::Legacy::FeeSerializer.new(model).serialize
-    end
-
     def pay_in_advance
       if model.charge?
         model.pay_in_advance
diff --git a/app/serializers/v1/invoice_serializer.rb b/app/serializers/v1/invoice_serializer.rb
index beb50bdab53..ecc1a2f1abf 100644
--- a/app/serializers/v1/invoice_serializer.rb
+++ b/app/serializers/v1/invoice_serializer.rb
@@ -26,7 +26,7 @@ def serialize
         prepaid_credit_amount_cents: model.prepaid_credit_amount_cents,
         file_url: model.file_url,
         version_number: model.version_number
-      }.merge(legacy_values)
+      }
 
       payload.merge!(customer) if include?(:customer)
       payload.merge!(subscriptions) if include?(:subscriptions)
@@ -89,9 +89,5 @@ def applied_taxes
         collection_name: 'applied_taxes'
       ).serialize
     end
-
-    def legacy_values
-      ::V1::Legacy::InvoiceSerializer.new(model).serialize
-    end
   end
 end
diff --git a/app/serializers/v1/legacy/applied_coupon_serializer.rb b/app/serializers/v1/legacy/applied_coupon_serializer.rb
deleted file mode 100644
index aa5cb5e358f..00000000000
--- a/app/serializers/v1/legacy/applied_coupon_serializer.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class AppliedCouponSerializer < ModelSerializer
-      def serialize
-        {
-          expiration_date: model.coupon.expiration_at&.to_date&.iso8601
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/coupon_serializer.rb b/app/serializers/v1/legacy/coupon_serializer.rb
deleted file mode 100644
index 3f9b7bdf4c8..00000000000
--- a/app/serializers/v1/legacy/coupon_serializer.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class CouponSerializer < ModelSerializer
-      def serialize
-        {
-          expiration_date: model.expiration_at&.to_date&.iso8601
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/credit_note_serializer.rb b/app/serializers/v1/legacy/credit_note_serializer.rb
deleted file mode 100644
index d5d363cf41c..00000000000
--- a/app/serializers/v1/legacy/credit_note_serializer.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class CreditNoteSerializer < ModelSerializer
-      def serialize
-        {
-          total_amount_currency: model.total_amount_currency,
-          vat_amount_cents: model.taxes_amount_cents,
-          vat_amount_currency: model.currency,
-          sub_total_vat_excluded_amount_cents: model.sub_total_excluding_taxes_amount_cents,
-          sub_total_vat_excluded_amount_currency: model.currency,
-          balance_amount_currency: model.balance_amount_currency,
-          credit_amount_currency: model.credit_amount_currency,
-          refund_amount_currency: model.refund_amount_currency
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/credit_serializer.rb b/app/serializers/v1/legacy/credit_serializer.rb
deleted file mode 100644
index c1cd01d5b31..00000000000
--- a/app/serializers/v1/legacy/credit_serializer.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class CreditSerializer < ModelSerializer
-      def serialize
-        {
-          before_vat: model.before_taxes,
-          item: {
-            lago_id: model.item_id
-          }
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/customer_serializer.rb b/app/serializers/v1/legacy/customer_serializer.rb
deleted file mode 100644
index bfd902aa390..00000000000
--- a/app/serializers/v1/legacy/customer_serializer.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class CustomerSerializer < ModelSerializer
-      def serialize
-        {
-          billing_configuration: {vat_rate: model.vat_rate}
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/customers/usage_serializer.rb b/app/serializers/v1/legacy/customers/usage_serializer.rb
deleted file mode 100644
index 023ca793da5..00000000000
--- a/app/serializers/v1/legacy/customers/usage_serializer.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    module Customers
-      class UsageSerializer < ModelSerializer
-        def serialize
-          {
-            from_date: model.from_datetime&.to_date,
-            to_date: model.to_datetime&.to_date,
-            amount_currency: model.currency,
-            total_amount_currency: model.currency,
-            vat_amount_currency: model.currency,
-            vat_amount_cents: model.taxes_amount_cents
-          }
-        end
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/event_error_serializer.rb b/app/serializers/v1/legacy/event_error_serializer.rb
deleted file mode 100644
index c0b9a11279d..00000000000
--- a/app/serializers/v1/legacy/event_error_serializer.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class EventErrorSerializer < ModelSerializer
-      def serialize
-        {
-          input_params: {
-            transaction_id: model.transaction_id,
-            external_subscription_id: model.external_subscription_id,
-            external_customer_id: model.external_customer_id,
-            timestamp: model.timestamp.to_f,
-            code: model.code,
-            properties: model.properties
-          }
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/fee_serializer.rb b/app/serializers/v1/legacy/fee_serializer.rb
deleted file mode 100644
index 42d6a63491d..00000000000
--- a/app/serializers/v1/legacy/fee_serializer.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class FeeSerializer < ModelSerializer
-      def serialize
-        {
-          vat_amount_cents: model.taxes_amount_cents,
-          vat_amount_currency: model.currency,
-          unit_amount_cents: model.unit_amount_cents,
-          lago_group_id: model.group_id,
-          item: {
-            group_invoice_display_name: model.charge_filter&.display_name
-          }
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/invoice_serializer.rb b/app/serializers/v1/legacy/invoice_serializer.rb
deleted file mode 100644
index 70eb19fa283..00000000000
--- a/app/serializers/v1/legacy/invoice_serializer.rb
+++ /dev/null
@@ -1,28 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class InvoiceSerializer < ModelSerializer
-      def serialize
-        {
-          legacy:,
-          amount_currency: model.currency,
-          vat_amount_currency: model.currency,
-          credit_amount_currency: model.currency,
-          total_amount_currency: model.currency,
-          amount_cents: model.fees_amount_cents,
-          credit_amount_cents: model.credits.sum(:amount_cents),
-          vat_amount_cents: model.taxes_amount_cents,
-          sub_total_vat_excluded_amount_cents: model.sub_total_excluding_taxes_amount_cents,
-          sub_total_vat_included_amount_cents: model.sub_total_including_taxes_amount_cents
-        }
-      end
-
-      private
-
-      def legacy
-        model.version_number < Invoice::CREDIT_NOTES_MIN_VERSION
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/organization_serializer.rb b/app/serializers/v1/legacy/organization_serializer.rb
deleted file mode 100644
index c8aec4a20ef..00000000000
--- a/app/serializers/v1/legacy/organization_serializer.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class OrganizationSerializer < ModelSerializer
-      def serialize
-        {
-          billing_configuration: {vat_rate: model.vat_rate}
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/subscription_serializer.rb b/app/serializers/v1/legacy/subscription_serializer.rb
deleted file mode 100644
index 311733deae2..00000000000
--- a/app/serializers/v1/legacy/subscription_serializer.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class SubscriptionSerializer < ModelSerializer
-      def serialize
-        {
-          subscription_date: model.subscription_at&.to_date
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/legacy/wallet_serializer.rb b/app/serializers/v1/legacy/wallet_serializer.rb
deleted file mode 100644
index ee0eb89c6ec..00000000000
--- a/app/serializers/v1/legacy/wallet_serializer.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-
-module V1
-  module Legacy
-    class WalletSerializer < ModelSerializer
-      def serialize
-        {
-          expiration_date: model.expiration_at&.to_date&.iso8601,
-          balance: model.balance.to_s
-        }
-      end
-    end
-  end
-end
diff --git a/app/serializers/v1/organization_serializer.rb b/app/serializers/v1/organization_serializer.rb
index 9a5cecb8235..40cd993db69 100644
--- a/app/serializers/v1/organization_serializer.rb
+++ b/app/serializers/v1/organization_serializer.rb
@@ -26,7 +26,7 @@ def serialize
         document_number_prefix: model.document_number_prefix,
         tax_identification_number: model.tax_identification_number,
         billing_configuration:
-      }.merge(legacy_values.except(:billing_configuration))
+      }
 
       payload = payload.merge(taxes) if include?(:taxes)
 
@@ -40,11 +40,7 @@ def billing_configuration
         invoice_footer: model.invoice_footer,
         invoice_grace_period: model.invoice_grace_period,
         document_locale: model.document_locale
-      }.merge(legacy_values[:billing_configuration])
-    end
-
-    def legacy_values
-      @legacy_values ||= ::V1::Legacy::OrganizationSerializer.new(model).serialize
+      }
     end
 
     def taxes
diff --git a/app/serializers/v1/subscription_serializer.rb b/app/serializers/v1/subscription_serializer.rb
index be111367261..73400f97134 100644
--- a/app/serializers/v1/subscription_serializer.rb
+++ b/app/serializers/v1/subscription_serializer.rb
@@ -22,7 +22,7 @@ def serialize
         previous_plan_code: model.previous_subscription&.plan&.code,
         next_plan_code: model.next_subscription&.plan&.code,
         downgrade_plan_date: model.downgrade_plan_date&.iso8601
-      }.merge(legacy_values)
+      }
 
       payload = payload.merge(customer:) if include?(:customer)
       payload = payload.merge(plan:) if include?(:plan)
@@ -32,10 +32,6 @@ def serialize
 
     private
 
-    def legacy_values
-      ::V1::Legacy::SubscriptionSerializer.new(model).serialize
-    end
-
     def customer
       ::V1::CustomerSerializer.new(model.customer).serialize
     end
diff --git a/app/serializers/v1/wallet_serializer.rb b/app/serializers/v1/wallet_serializer.rb
index 109518a22c7..24592097d09 100644
--- a/app/serializers/v1/wallet_serializer.rb
+++ b/app/serializers/v1/wallet_serializer.rb
@@ -23,7 +23,7 @@ def serialize
         last_balance_sync_at: model.last_balance_sync_at&.iso8601,
         last_consumed_credit_at: model.last_consumed_credit_at&.iso8601,
         terminated_at: model.terminated_at
-      }.merge(legacy_values)
+      }
 
       payload.merge!(recurring_transaction_rules) if include?(:recurring_transaction_rules)
 
@@ -32,12 +32,6 @@ def serialize
 
     private
 
-    def legacy_values
-      ::V1::Legacy::WalletSerializer.new(
-        model
-      ).serialize
-    end
-
     def recurring_transaction_rules
       ::CollectionSerializer.new(
         model.recurring_transaction_rules,
diff --git a/app/services/customers/create_service.rb b/app/services/customers/create_service.rb
index 3e119a1d3b0..2c0a981a0a3 100644
--- a/app/services/customers/create_service.rb
+++ b/app/services/customers/create_service.rb
@@ -137,7 +137,6 @@ def create(**args)
         legal_number: args[:legal_number],
         net_payment_term: args[:net_payment_term],
         external_salesforce_id: args[:external_salesforce_id],
-        vat_rate: args[:vat_rate],
         payment_provider: args[:payment_provider],
         payment_provider_code: args[:payment_provider_code],
         currency: args[:currency],
@@ -251,9 +250,6 @@ def handle_api_billing_configuration(customer, params, new_customer)
         Customers::UpdateInvoiceGracePeriodService.call(customer:, grace_period: billing[:invoice_grace_period])
       end
 
-      # NOTE(legacy): keep accepting vat_rate field temporary by converting it into tax
-      handle_legacy_vat_rate(customer:, vat_rate: billing[:vat_rate]) if billing.key?(:vat_rate)
-
       customer.document_locale = billing[:document_locale] if billing.key?(:document_locale)
 
       if new_customer || should_create_billing_configuration?(billing, customer)
@@ -318,27 +314,6 @@ def track_customer_created(customer)
       )
     end
 
-    def handle_legacy_vat_rate(customer:, vat_rate:)
-      if customer.taxes.count > 1
-        result.single_validation_failure!(
-          field: :vat_rate,
-          error_code: 'multiple_taxes'
-        ).raise_if_error!
-      end
-
-      # NOTE(legacy): Keep updating vat_rate until we remove the field
-      customer.vat_rate = vat_rate
-
-      current_tax = customer.taxes.first
-      return if current_tax&.rate == vat_rate
-
-      tax = customer.organization.taxes
-        .create_with(rate: vat_rate, name: "Tax (#{vat_rate}%)")
-        .find_or_create_by!(code: "tax_#{vat_rate}")
-
-      Customers::ApplyTaxesService.call(customer:, tax_codes: [tax.code])
-    end
-
     def should_create_billing_configuration?(billing, customer)
       billing[:sync_with_provider] && customer.provider_customer&.provider_customer_id.nil?
     end
diff --git a/app/services/customers/update_service.rb b/app/services/customers/update_service.rb
index 881e947bb90..a65087305ea 100644
--- a/app/services/customers/update_service.rb
+++ b/app/services/customers/update_service.rb
@@ -51,8 +51,6 @@ def update(**args)
 
         assign_premium_attributes(customer, args)
 
-        # TODO: delete this when GraphQL will use billing_configuration.
-        customer.vat_rate = args[:vat_rate] if args.key?(:vat_rate)
         customer.payment_provider = args[:payment_provider] if args.key?(:payment_provider)
         customer.payment_provider_code = args[:payment_provider_code] if args.key?(:payment_provider_code)
         customer.invoice_footer = args[:invoice_footer] if args.key?(:invoice_footer)
@@ -69,7 +67,6 @@ def update(**args)
       if args.key?(:billing_configuration)
         billing = args[:billing_configuration]
         customer.invoice_footer = billing[:invoice_footer] if billing.key?(:invoice_footer)
-        customer.vat_rate = billing[:vat_rate] if billing.key?(:vat_rate)
 
         if License.premium? && billing.key?(:invoice_grace_period)
           Customers::UpdateInvoiceGracePeriodService.call(customer:, grace_period: billing[:invoice_grace_period])
diff --git a/app/services/organizations/update_service.rb b/app/services/organizations/update_service.rb
index eb445810d04..17699ba77de 100644
--- a/app/services/organizations/update_service.rb
+++ b/app/services/organizations/update_service.rb
@@ -31,9 +31,6 @@ def call
       organization.invoice_footer = billing[:invoice_footer] if billing.key?(:invoice_footer)
       organization.document_locale = billing[:document_locale] if billing.key?(:document_locale)
 
-      # NOTE(legacy): keep accepting vat_rate field temporary by converting it into tax rate
-      handle_legacy_vat_rate(billing[:vat_rate]) if billing.key?(:vat_rate)
-
       # NOTE: handle eu tax management for organization
       handle_eu_tax_management(params[:eu_tax_management]) if params.key?(:eu_tax_management)
 
@@ -97,28 +94,6 @@ def handle_base64_logo
       )
     end
 
-    def handle_legacy_vat_rate(vat_rate)
-      if organization.taxes.applied_to_organization.count > 1
-        result.single_validation_failure!(field: :vat_rate, error_code: 'multiple_taxes')
-          .raise_if_error!
-      end
-
-      # NOTE(legacy): Keep updating vat_rate until we remove the field
-      organization.vat_rate = vat_rate
-
-      current_tax = organization.taxes.applied_to_organization.first
-      return if current_tax&.rate == vat_rate
-
-      current_tax&.update!(applied_to_organization: false)
-      return if vat_rate.zero?
-
-      organization.taxes.create_with(
-        rate: vat_rate,
-        name: "Tax (#{vat_rate}%)",
-        applied_to_organization: true
-      ).find_or_create_by!(code: "tax_#{vat_rate}")
-    end
-
     def handle_eu_tax_management(eu_tax_management)
       trying_to_enable_eu_tax_management = params[:eu_tax_management] && !organization.eu_tax_management
       if !organization.eu_vat_eligible? && trying_to_enable_eu_tax_management
diff --git a/schema.graphql b/schema.graphql
index 58fc6df98de..f876e00ace9 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -5147,7 +5147,6 @@ type OrganizationBillingConfiguration {
   id: ID!
   invoiceFooter: String
   invoiceGracePeriod: Int!
-  vatRate: Float!
 }
 
 input OrganizationBillingConfigurationInput {
diff --git a/schema.json b/schema.json
index 3c8c7f63642..0d2661faff5 100644
--- a/schema.json
+++ b/schema.json
@@ -24672,24 +24672,6 @@
               "deprecationReason": null,
               "args": [
 
-              ]
-            },
-            {
-              "name": "vatRate",
-              "description": null,
-              "type": {
-                "kind": "NON_NULL",
-                "name": null,
-                "ofType": {
-                  "kind": "SCALAR",
-                  "name": "Float",
-                  "ofType": null
-                }
-              },
-              "isDeprecated": false,
-              "deprecationReason": null,
-              "args": [
-
               ]
             }
           ],
diff --git a/spec/factories/organizations.rb b/spec/factories/organizations.rb
index ead1d77b1da..4f01e0bfb00 100644
--- a/spec/factories/organizations.rb
+++ b/spec/factories/organizations.rb
@@ -4,7 +4,6 @@
   factory :organization do
     name { Faker::Company.name }
     default_currency { 'USD' }
-    vat_rate { 20 }
 
     email { Faker::Internet.email }
     email_settings { ['invoice.finalized', 'credit_note.created'] }
diff --git a/spec/graphql/resolvers/organization_resolver_spec.rb b/spec/graphql/resolvers/organization_resolver_spec.rb
index 5390d1b6ca0..dc409999f64 100644
--- a/spec/graphql/resolvers/organization_resolver_spec.rb
+++ b/spec/graphql/resolvers/organization_resolver_spec.rb
@@ -45,7 +45,7 @@
             taxIdentificationNumber
             apiKey
             webhookUrl
-            billingConfiguration { invoiceFooter vatRate }
+            billingConfiguration { invoiceFooter }
             emailSettings
             taxes { id code }
           }
@@ -68,7 +68,6 @@
         expect(data['taxIdentificationNumber']).to eq(organization.tax_identification_number)
         expect(data['apiKey']).to eq(organization.api_key)
         expect(data['webhookUrl']).to eq(organization.webhook_endpoints.first.webhook_url)
-        expect(data['billingConfiguration']['vatRate']).to eq(organization.vat_rate)
         expect(data['billingConfiguration']['invoiceFooter']).to eq(organization.invoice_footer)
         expect(data['emailSettings']).to eq(organization.email_settings.map { _1.tr('.', '_') })
         expect(data['taxes']).to eq []
diff --git a/spec/requests/api/v1/applied_coupons_controller_spec.rb b/spec/requests/api/v1/applied_coupons_controller_spec.rb
index 0c205a59935..b42d9967509 100644
--- a/spec/requests/api/v1/applied_coupons_controller_spec.rb
+++ b/spec/requests/api/v1/applied_coupons_controller_spec.rb
@@ -35,7 +35,7 @@
         expect(json[:applied_coupon][:external_customer_id]).to eq(customer.external_id)
         expect(json[:applied_coupon][:amount_cents]).to eq(coupon.amount_cents)
         expect(json[:applied_coupon][:amount_currency]).to eq(coupon.amount_currency)
-        expect(json[:applied_coupon][:expiration_date]).to be_nil
+        expect(json[:applied_coupon][:expiration_at]).to be_nil
         expect(json[:applied_coupon][:created_at]).to be_present
         expect(json[:applied_coupon][:terminated_at]).to be_nil
       end
diff --git a/spec/requests/api/v1/coupons_controller_spec.rb b/spec/requests/api/v1/coupons_controller_spec.rb
index 57d9df3cbc7..40b8f04e845 100644
--- a/spec/requests/api/v1/coupons_controller_spec.rb
+++ b/spec/requests/api/v1/coupons_controller_spec.rb
@@ -39,23 +39,6 @@
       expect(json[:coupon][:limited_billable_metrics]).to eq(true)
       expect(json[:coupon][:billable_metric_codes].first).to eq(billable_metric.code)
     end
-
-    context 'with expiration date input' do
-      before do
-        create_params.except!(:expiration_at)
-        create_params[:expiration_date] = expiration_at.to_date
-      end
-
-      it 'creates a coupon' do
-        post_with_token(organization, '/api/v1/coupons', {coupon: create_params})
-
-        expect(response).to have_http_status(:success)
-        expect(json[:coupon][:lago_id]).to be_present
-        expect(json[:coupon][:code]).to eq(create_params[:code])
-        expect(json[:coupon][:name]).to eq(create_params[:name])
-        expect(json[:coupon][:expiration_at]).to eq(expiration_at.end_of_day.iso8601)
-      end
-    end
   end
 
   describe 'update' do
@@ -88,26 +71,6 @@
       expect(json[:coupon][:expiration_at]).to eq(expiration_at.iso8601)
     end
 
-    context 'with expiration date input' do
-      before do
-        update_params.except!(:expiration_at)
-        update_params[:expiration_date] = expiration_at.to_date
-      end
-
-      it 'creates a coupon' do
-        put_with_token(
-          organization,
-          "/api/v1/coupons/#{coupon.code}",
-          {coupon: update_params}
-        )
-
-        expect(response).to have_http_status(:success)
-        expect(json[:coupon][:lago_id]).to eq(coupon.id)
-        expect(json[:coupon][:code]).to eq(update_params[:code])
-        expect(json[:coupon][:expiration_at]).to eq(expiration_at.end_of_day.iso8601)
-      end
-    end
-
     context 'when coupon does not exist' do
       it 'returns not_found error' do
         put_with_token(organization, '/api/v1/coupons/invalid', {coupon: update_params})
diff --git a/spec/requests/api/v1/credit_notes_controller_spec.rb b/spec/requests/api/v1/credit_notes_controller_spec.rb
index fdbb562bcbe..06c467026f2 100644
--- a/spec/requests/api/v1/credit_notes_controller_spec.rb
+++ b/spec/requests/api/v1/credit_notes_controller_spec.rb
@@ -38,12 +38,10 @@
           invoice_number: invoice.number,
           credit_status: credit_note.credit_status,
           reason: credit_note.reason,
+          currency: credit_note.currency,
           total_amount_cents: credit_note.total_amount_cents,
-          total_amount_currency: credit_note.total_amount_currency,
           credit_amount_cents: credit_note.credit_amount_cents,
-          credit_amount_currency: credit_note.credit_amount_currency,
           balance_amount_cents: credit_note.balance_amount_cents,
-          balance_amount_currency: credit_note.balance_amount_currency,
           created_at: credit_note.created_at.iso8601,
           updated_at: credit_note.updated_at.iso8601,
           applied_taxes: []
@@ -276,14 +274,11 @@
           refund_status: 'pending',
           reason: 'duplicated_charge',
           description: 'Duplicated charge',
+          currency: 'EUR',
           total_amount_cents: 15,
-          total_amount_currency: 'EUR',
           credit_amount_cents: 10,
-          credit_amount_currency: 'EUR',
           balance_amount_cents: 10,
-          balance_amount_currency: 'EUR',
           refund_amount_cents: 5,
-          refund_amount_currency: 'EUR',
           applied_taxes: []
         )
 
diff --git a/spec/requests/api/v1/customers/usage_controller_spec.rb b/spec/requests/api/v1/customers/usage_controller_spec.rb
index 82903ced04c..be8544e954d 100644
--- a/spec/requests/api/v1/customers/usage_controller_spec.rb
+++ b/spec/requests/api/v1/customers/usage_controller_spec.rb
@@ -70,15 +70,12 @@
       aggregate_failures do
         expect(response).to have_http_status(:success)
 
-        expect(json[:customer_usage][:from_date]).to eq(Time.zone.today.beginning_of_month.iso8601)
-        expect(json[:customer_usage][:to_date]).to eq(Time.zone.today.end_of_month.iso8601)
+        expect(json[:customer_usage][:from_datetime]).to eq(Time.zone.today.beginning_of_month.beginning_of_day.iso8601)
+        expect(json[:customer_usage][:to_datetime]).to eq(Time.zone.today.end_of_month.end_of_day.iso8601)
         expect(json[:customer_usage][:issuing_date]).to eq(Time.zone.today.end_of_month.iso8601)
         expect(json[:customer_usage][:amount_cents]).to eq(5)
-        expect(json[:customer_usage][:amount_currency]).to eq('EUR')
+        expect(json[:customer_usage][:currency]).to eq('EUR')
         expect(json[:customer_usage][:total_amount_cents]).to eq(6)
-        expect(json[:customer_usage][:total_amount_currency]).to eq('EUR')
-        expect(json[:customer_usage][:vat_amount_cents]).to eq(1)
-        expect(json[:customer_usage][:vat_amount_currency]).to eq('EUR')
 
         charge_usage = json[:customer_usage][:charges_usage].first
         expect(charge_usage[:billable_metric][:name]).to eq(metric.name)
diff --git a/spec/requests/api/v1/customers_controller_spec.rb b/spec/requests/api/v1/customers_controller_spec.rb
index 3600796df83..bb2c7fe521d 100644
--- a/spec/requests/api/v1/customers_controller_spec.rb
+++ b/spec/requests/api/v1/customers_controller_spec.rb
@@ -65,7 +65,6 @@
             payment_provider: 'stripe',
             payment_provider_code: stripe_provider.code,
             provider_customer_id: 'stripe_id',
-            vat_rate: 20,
             document_locale: 'fr',
             provider_payment_methods:
           }
@@ -98,7 +97,6 @@
             expect(billing[:payment_provider_code]).to eq(stripe_provider.code)
             expect(billing[:provider_customer_id]).to eq('stripe_id')
             expect(billing[:invoice_grace_period]).to eq(3)
-            expect(billing[:vat_rate]).to eq(20)
             expect(billing[:document_locale]).to eq('fr')
             expect(billing[:provider_payment_methods]).to eq(%w[card])
           end
@@ -121,7 +119,6 @@
             expect(billing[:payment_provider_code]).to eq(stripe_provider.code)
             expect(billing[:provider_customer_id]).to eq('stripe_id')
             expect(billing[:invoice_grace_period]).to eq(3)
-            expect(billing[:vat_rate]).to eq(20)
             expect(billing[:document_locale]).to eq('fr')
             expect(billing[:provider_payment_methods]).to eq(%w[card sepa_debit])
           end
@@ -144,7 +141,6 @@
             expect(billing[:payment_provider_code]).to eq(stripe_provider.code)
             expect(billing[:provider_customer_id]).to eq('stripe_id')
             expect(billing[:invoice_grace_period]).to eq(3)
-            expect(billing[:vat_rate]).to eq(20)
             expect(billing[:document_locale]).to eq('fr')
             expect(billing[:provider_payment_methods]).to eq(%w[card])
           end
@@ -167,7 +163,6 @@
             expect(billing[:payment_provider_code]).to eq(stripe_provider.code)
             expect(billing[:provider_customer_id]).to eq('stripe_id')
             expect(billing[:invoice_grace_period]).to eq(3)
-            expect(billing[:vat_rate]).to eq(20)
             expect(billing[:document_locale]).to eq('fr')
             expect(billing[:provider_payment_methods]).to eq(%w[sepa_debit])
           end
diff --git a/spec/requests/api/v1/events_controller_spec.rb b/spec/requests/api/v1/events_controller_spec.rb
index 86302fb64ab..ff47108e22b 100644
--- a/spec/requests/api/v1/events_controller_spec.rb
+++ b/spec/requests/api/v1/events_controller_spec.rb
@@ -160,8 +160,6 @@
         expect(fee[:pay_in_advance]).to eq(true)
         expect(fee[:amount_cents]).to be_an(Integer)
         expect(fee[:amount_currency]).to eq('EUR')
-        expect(fee[:vat_amount_cents]).to be_an(Integer)
-        expect(fee[:vat_amount_currency]).to eq('EUR')
         expect(fee[:units]).to eq('1.0')
         expect(fee[:events_count]).to eq(1)
       end
diff --git a/spec/requests/api/v1/fees_controller_spec.rb b/spec/requests/api/v1/fees_controller_spec.rb
index 7dc6d585694..02ef6d6fcfd 100644
--- a/spec/requests/api/v1/fees_controller_spec.rb
+++ b/spec/requests/api/v1/fees_controller_spec.rb
@@ -18,7 +18,6 @@
 
         expect(json[:fee]).to include(
           lago_id: fee.id,
-          lago_group_id: fee.group_id,
           amount_cents: fee.amount_cents,
           amount_currency: fee.amount_currency,
           taxes_amount_cents: fee.taxes_amount_cents,
@@ -46,7 +45,6 @@
 
           expect(json[:fee]).to include(
             lago_id: fee.id,
-            lago_group_id: fee.group_id,
             amount_cents: fee.amount_cents,
             amount_currency: fee.amount_currency,
             taxes_amount_cents: fee.taxes_amount_cents,
@@ -100,11 +98,9 @@
 
         expect(json[:fee]).to include(
           lago_id: fee.reload.id,
-          lago_group_id: fee.group_id,
           amount_cents: fee.amount_cents,
           amount_currency: fee.amount_currency,
           taxes_amount_cents: fee.taxes_amount_cents,
-          vat_amount_cents: fee.taxes_amount_cents,
           units: fee.units.to_s,
           events_count: fee.events_count,
           payment_status: fee.payment_status,
diff --git a/spec/requests/api/v1/invoices_controller_spec.rb b/spec/requests/api/v1/invoices_controller_spec.rb
index ec9fac3c474..3c65db2faa2 100644
--- a/spec/requests/api/v1/invoices_controller_spec.rb
+++ b/spec/requests/api/v1/invoices_controller_spec.rb
@@ -43,7 +43,7 @@
         lago_id: String,
         issuing_date: Time.current.to_date.to_s,
         invoice_type: 'one_off',
-        amount_cents: 2800,
+        fees_amount_cents: 2800,
         taxes_amount_cents: 560,
         total_amount_cents: 3360,
         currency: 'EUR'
diff --git a/spec/requests/api/v1/organizations_controller_spec.rb b/spec/requests/api/v1/organizations_controller_spec.rb
index 6878cd34613..34468d23335 100644
--- a/spec/requests/api/v1/organizations_controller_spec.rb
+++ b/spec/requests/api/v1/organizations_controller_spec.rb
@@ -26,7 +26,6 @@
         billing_configuration: {
           invoice_footer: 'footer',
           invoice_grace_period: 3,
-          vat_rate: 20,
           document_locale: 'fr'
         }
       }
@@ -46,7 +45,6 @@
         expect(json[:organization][:default_currency]).to eq('EUR')
         expect(json[:organization][:webhook_url]).to eq(webhook_url)
         expect(json[:organization][:webhook_urls]).to eq([webhook_url])
-        expect(json[:organization][:vat_rate]).to eq(update_params[:vat_rate])
         expect(json[:organization][:document_numbering]).to eq('per_customer')
         expect(json[:organization][:document_number_prefix]).to eq('ORG-2')
         # TODO(:timezone): Timezone update is turned off for now
@@ -55,7 +53,6 @@
         billing = json[:organization][:billing_configuration]
         expect(billing[:invoice_footer]).to eq('footer')
         expect(billing[:document_locale]).to eq('fr')
-        expect(billing[:vat_rate]).to eq(20)
 
         expect(json[:organization][:taxes]).not_to be_nil
       end
diff --git a/spec/requests/api/v1/subscriptions_controller_spec.rb b/spec/requests/api/v1/subscriptions_controller_spec.rb
index 74b4063a2b7..c88f910b228 100644
--- a/spec/requests/api/v1/subscriptions_controller_spec.rb
+++ b/spec/requests/api/v1/subscriptions_controller_spec.rb
@@ -138,7 +138,7 @@
           name: 'subscription name',
           external_id: SecureRandom.uuid,
           billing_time: 'anniversary',
-          subscription_date: subscription_at.to_date
+          subscription_at: subscription_at
         }
       end
 
@@ -156,8 +156,7 @@
         expect(json[:subscription][:name]).to eq('subscription name')
         expect(json[:subscription][:started_at]).to be_present
         expect(json[:subscription][:billing_time]).to eq('anniversary')
-        expect(json[:subscription][:subscription_at]).to eq(Time.current.beginning_of_day.iso8601)
-        expect(json[:subscription][:subscription_date].to_s).to eq(Time.current.to_date.to_s)
+        expect(json[:subscription][:subscription_at]).to eq(Time.zone.parse(subscription_at).iso8601)
         expect(json[:subscription][:previous_plan_code]).to be_nil
         expect(json[:subscription][:next_plan_code]).to be_nil
         expect(json[:subscription][:downgrade_plan_date]).to be_nil
diff --git a/spec/requests/api/v1/wallets_controller_spec.rb b/spec/requests/api/v1/wallets_controller_spec.rb
index e433f1ff1a0..57f73f08305 100644
--- a/spec/requests/api/v1/wallets_controller_spec.rb
+++ b/spec/requests/api/v1/wallets_controller_spec.rb
@@ -36,26 +36,6 @@
       end
     end
 
-    context 'with expiration date' do
-      before do
-        create_params.except!(:expiration_at)
-        create_params[:expiration_date] = expiration_at.to_date
-      end
-
-      it 'creates a wallet' do
-        post_with_token(organization, '/api/v1/wallets', {wallet: create_params})
-
-        aggregate_failures do
-          expect(response).to have_http_status(:success)
-
-          expect(json[:wallet][:lago_id]).to be_present
-          expect(json[:wallet][:name]).to eq(create_params[:name])
-          expect(json[:wallet][:external_customer_id]).to eq(customer.external_id)
-          expect(json[:wallet][:expiration_at]).to eq((Time.current + 1.year).end_of_day.iso8601)
-        end
-      end
-    end
-
     context 'with recurring transaction rules' do
       around { |test| lago_premium!(&test) }
 
@@ -124,29 +104,6 @@
       end
     end
 
-    context 'with expiration date' do
-      before do
-        update_params.except!(:expiration_at)
-        update_params[:expiration_date] = expiration_at.to_date
-      end
-
-      it 'updates a wallet' do
-        put_with_token(
-          organization,
-          "/api/v1/wallets/#{wallet.id}",
-          {wallet: update_params}
-        )
-
-        aggregate_failures do
-          expect(response).to have_http_status(:success)
-
-          expect(json[:wallet][:lago_id]).to eq(wallet.id)
-          expect(json[:wallet][:name]).to eq(update_params[:name])
-          expect(json[:wallet][:expiration_at]).to eq((Time.current + 1.year).end_of_day.iso8601)
-        end
-      end
-    end
-
     context 'when wallet does not exist' do
       it 'returns not_found error' do
         put_with_token(organization, '/api/v1/wallets/invalid', {wallet: update_params})
diff --git a/spec/serializers/v1/applied_coupon_serializer_spec.rb b/spec/serializers/v1/applied_coupon_serializer_spec.rb
index a3eafe6a8d4..229e9ffd341 100644
--- a/spec/serializers/v1/applied_coupon_serializer_spec.rb
+++ b/spec/serializers/v1/applied_coupon_serializer_spec.rb
@@ -38,7 +38,6 @@
       expect(result['applied_coupon']['credits'].first['lago_id']).to eq(credit.id)
       expect(result['applied_coupon']['credits'].first['amount_cents']).to eq(credit.amount_cents)
       expect(result['applied_coupon']['credits'].first['amount_currency']).to eq(credit.amount_currency)
-      expect(result['applied_coupon']['credits'].first['item']['lago_id']).to eq(credit.item_id)
       expect(result['applied_coupon']['credits'].first['item']['type']).to eq(credit.item_type)
       expect(result['applied_coupon']['credits'].first['item']['code']).to eq(credit.item_code)
       expect(result['applied_coupon']['credits'].first['item']['name']).to eq(credit.item_name)
diff --git a/spec/serializers/v1/coupon_serializer_spec.rb b/spec/serializers/v1/coupon_serializer_spec.rb
index a1a37b0f62d..6fe39c5f204 100644
--- a/spec/serializers/v1/coupon_serializer_spec.rb
+++ b/spec/serializers/v1/coupon_serializer_spec.rb
@@ -30,10 +30,4 @@
       expect(result['coupon']['billable_metric_codes']).to eq([])
     end
   end
-
-  it 'serializes the legacy fields' do
-    result = JSON.parse(serializer.to_json)
-
-    expect(result['coupon']['expiration_date']).to eq(coupon.expiration_at&.to_date&.iso8601)
-  end
 end
diff --git a/spec/serializers/v1/credit_note_serializer_spec.rb b/spec/serializers/v1/credit_note_serializer_spec.rb
index 3616a19f9bd..3b91d688aa6 100644
--- a/spec/serializers/v1/credit_note_serializer_spec.rb
+++ b/spec/serializers/v1/credit_note_serializer_spec.rb
@@ -35,17 +35,7 @@
       'coupons_adjustment_amount_cents' => credit_note.coupons_adjustment_amount_cents,
       'created_at' => credit_note.created_at.iso8601,
       'updated_at' => credit_note.updated_at.iso8601,
-      'file_url' => credit_note.file_url,
-
-      # NOTE: deprecated fields
-      'total_amount_currency' => credit_note.total_amount_currency,
-      'vat_amount_currency' => credit_note.currency,
-      'sub_total_vat_excluded_amount_currency' => credit_note.currency,
-      'balance_amount_currency' => credit_note.balance_amount_currency,
-      'credit_amount_currency' => credit_note.credit_amount_currency,
-      'refund_amount_currency' => credit_note.refund_amount_currency,
-      'vat_amount_cents' => credit_note.taxes_amount_cents,
-      'sub_total_vat_excluded_amount_cents' => credit_note.sub_total_excluding_taxes_amount_cents
+      'file_url' => credit_note.file_url
     )
 
     expect(result['credit_note'].keys).to include('customer', 'items')
diff --git a/spec/serializers/v1/credit_serializer_spec.rb b/spec/serializers/v1/credit_serializer_spec.rb
index 70f4a9c27a0..0727304f320 100644
--- a/spec/serializers/v1/credit_serializer_spec.rb
+++ b/spec/serializers/v1/credit_serializer_spec.rb
@@ -21,10 +21,6 @@
       expect(result['credit']['item']['name']).to eq(credit.item_name)
       expect(result['credit']['invoice']['payment_status']).to eq(credit.invoice.payment_status)
       expect(result['credit']['invoice']['lago_id']).to eq(credit.invoice.id)
-
-      # NOTE: legacy fields
-      expect(result['credit']['before_vat']).to eq(false)
-      expect(result['credit']['item']['lago_id']).to eq(credit.item_id)
     end
   end
 end
diff --git a/spec/serializers/v1/customer_serializer_spec.rb b/spec/serializers/v1/customer_serializer_spec.rb
index 862cac8e7d0..a81882a1321 100644
--- a/spec/serializers/v1/customer_serializer_spec.rb
+++ b/spec/serializers/v1/customer_serializer_spec.rb
@@ -48,7 +48,6 @@
       expect(result['customer']['billing_configuration']['payment_provider']).to eq(customer.payment_provider)
       expect(result['customer']['billing_configuration']['payment_provider_code']).to eq(customer.payment_provider_code)
       expect(result['customer']['billing_configuration']['invoice_grace_period']).to eq(customer.invoice_grace_period)
-      expect(result['customer']['billing_configuration']['vat_rate']).to eq(customer.vat_rate)
       expect(result['customer']['billing_configuration']['document_locale']).to eq(customer.document_locale)
       expect(result['customer']['shipping_address']['address_line1']).to eq('test1')
       expect(result['customer']['shipping_address']['city']).to eq('Paris')
diff --git a/spec/serializers/v1/customers/usage_serializer_spec.rb b/spec/serializers/v1/customers/usage_serializer_spec.rb
index 1d4d4339c7a..4054b541ebf 100644
--- a/spec/serializers/v1/customers/usage_serializer_spec.rb
+++ b/spec/serializers/v1/customers/usage_serializer_spec.rb
@@ -45,11 +45,7 @@
       expect(result['customer_usage']['currency']).to eq('EUR')
       expect(result['customer_usage']['taxes_amount_cents']).to eq(1)
       expect(result['customer_usage']['amount_cents']).to eq(5)
-      expect(result['customer_usage']['amount_currency']).to eq('EUR')
       expect(result['customer_usage']['total_amount_cents']).to eq(6)
-      expect(result['customer_usage']['total_amount_currency']).to eq('EUR')
-      expect(result['customer_usage']['vat_amount_cents']).to eq(1)
-      expect(result['customer_usage']['vat_amount_currency']).to eq('EUR')
 
       charge_usage = result['customer_usage']['charges_usage'].first
       expect(charge_usage['billable_metric']['name']).to eq('Charge')
@@ -62,11 +58,4 @@
       expect(charge_usage['groups']).to eq([])
     end
   end
-
-  it 'serializes the legacy value' do
-    aggregate_failures do
-      expect(result['customer_usage']['from_date']).to eq(Time.current.beginning_of_month.to_date.iso8601)
-      expect(result['customer_usage']['to_date']).to eq(Time.current.end_of_month.to_date.iso8601)
-    end
-  end
 end
diff --git a/spec/serializers/v1/event_error_serializer_spec.rb b/spec/serializers/v1/event_error_serializer_spec.rb
index 020c0531e4a..d2711dcdfb3 100644
--- a/spec/serializers/v1/event_error_serializer_spec.rb
+++ b/spec/serializers/v1/event_error_serializer_spec.rb
@@ -34,16 +34,6 @@
         'external_subscription_id' => event_error.event.external_subscription_id,
         'created_at' => event_error.event.created_at.iso8601
       )
-
-      # NOTE: legacy values
-      expect(result['event_error']['input_params']).to include(
-        'transaction_id' => event_error.event.transaction_id,
-        'external_subscription_id' => event_error.event.external_subscription_id,
-        'external_customer_id' => event_error.event.external_customer_id,
-        'timestamp' => event_error.event.timestamp.to_f,
-        'code' => event_error.event.code,
-        'properties' => event_error.event.properties
-      )
     end
   end
 end
diff --git a/spec/serializers/v1/fee_serializer_spec.rb b/spec/serializers/v1/fee_serializer_spec.rb
index 98768a905ab..d71e48ed50f 100644
--- a/spec/serializers/v1/fee_serializer_spec.rb
+++ b/spec/serializers/v1/fee_serializer_spec.rb
@@ -22,7 +22,6 @@
     aggregate_failures do
       expect(result['fee']).to include(
         'lago_id' => fee.id,
-        'lago_group_id' => fee.group_id,
         'lago_charge_filter_id' => fee.charge_filter_id,
         'lago_invoice_id' => fee.invoice_id,
         'lago_true_up_fee_id' => fee.true_up_fee&.id,
@@ -35,11 +34,9 @@
         'amount_currency' => fee.amount_currency,
         'taxes_amount_cents' => fee.taxes_amount_cents,
         'taxes_rate' => fee.taxes_rate,
-        'vat_amount_cents' => fee.taxes_amount_cents,
         'total_amount_cents' => fee.total_amount_cents,
         'total_amount_currency' => fee.amount_currency,
         'units' => fee.units.to_s,
-        'unit_amount_cents' => fee.unit_amount_cents,
         'precise_unit_amount' => fee.precise_unit_amount.to_s,
         'pay_in_advance' => fee.subscription.plan.pay_in_advance,
         'invoiceable' => true,
@@ -137,7 +134,7 @@
           'code' => fee.item_code,
           'name' => fee.item_name,
           'invoice_display_name' => fee.invoice_name,
-          'group_invoice_display_name' => fee.filter_display_name,
+          'filter_invoice_display_name' => fee.filter_display_name,
           'lago_item_id' => fee.item_id,
           'item_type' => fee.item_type
         )
diff --git a/spec/serializers/v1/invoice_serializer_spec.rb b/spec/serializers/v1/invoice_serializer_spec.rb
index 563779fc637..d3ec5fc3609 100644
--- a/spec/serializers/v1/invoice_serializer_spec.rb
+++ b/spec/serializers/v1/invoice_serializer_spec.rb
@@ -36,19 +36,7 @@
         'sub_total_including_taxes_amount_cents' => invoice.sub_total_including_taxes_amount_cents,
         'total_amount_cents' => invoice.total_amount_cents,
         'file_url' => invoice.file_url,
-        'version_number' => 4,
-
-        # NOTE: deprecated fields
-        'legacy' => false,
-        'amount_currency' => invoice.currency,
-        'vat_amount_currency' => invoice.currency,
-        'credit_amount_currency' => invoice.currency,
-        'total_amount_currency' => invoice.currency,
-        'amount_cents' => invoice.fees.sum(:amount_cents),
-        'credit_amount_cents' => invoice.credits.sum(:amount_cents),
-        'vat_amount_cents' => invoice.taxes_amount_cents,
-        'sub_total_vat_excluded_amount_cents' => invoice.sub_total_excluding_taxes_amount_cents,
-        'sub_total_vat_included_amount_cents' => invoice.sub_total_including_taxes_amount_cents
+        'version_number' => 4
       )
 
       expect(result['invoice']['metadata'].first).to include(
diff --git a/spec/serializers/v1/organization_serializer_spec.rb b/spec/serializers/v1/organization_serializer_spec.rb
index 013a3701576..588a891e8a1 100644
--- a/spec/serializers/v1/organization_serializer_spec.rb
+++ b/spec/serializers/v1/organization_serializer_spec.rb
@@ -33,7 +33,6 @@
       expect(result['organization']['legal_number']).to eq(org.legal_number)
       expect(result['organization']['billing_configuration']['invoice_footer']).to eq(org.invoice_footer)
       expect(result['organization']['billing_configuration']['invoice_grace_period']).to eq(org.invoice_grace_period)
-      expect(result['organization']['billing_configuration']['vat_rate']).to eq(org.vat_rate)
       expect(result['organization']['billing_configuration']['document_locale']).to eq(org.document_locale)
       expect(result['organization']['tax_identification_number']).to eq(org.tax_identification_number)
       expect(result['organization']['timezone']).to eq(org.timezone)
diff --git a/spec/serializers/v1/wallet_serializer_spec.rb b/spec/serializers/v1/wallet_serializer_spec.rb
index 8daf28a384e..1a6e8f6cf5a 100644
--- a/spec/serializers/v1/wallet_serializer_spec.rb
+++ b/spec/serializers/v1/wallet_serializer_spec.rb
@@ -32,11 +32,6 @@
         'ongoing_usage_balance_cents' => wallet.ongoing_usage_balance_cents,
         'consumed_credits' => wallet.consumed_credits.to_s
       )
-
-      # NOTE: legacy values
-      expect(result['wallet']).to include(
-        'balance' => wallet.balance.to_s
-      )
     end
   end
 end
diff --git a/spec/services/coupons/create_service_spec.rb b/spec/services/coupons/create_service_spec.rb
index a764446e918..314a1706804 100644
--- a/spec/services/coupons/create_service_spec.rb
+++ b/spec/services/coupons/create_service_spec.rb
@@ -72,7 +72,7 @@
           frequency: 'once',
           percentage_rate: 20.00,
           expiration: 'time_limit',
-          expiration_date: (Time.current + 3.days).to_date
+          expiration_at: (Time.current + 3.days).iso8601
         }
       end
 
diff --git a/spec/services/credit_notes/create_from_termination_spec.rb b/spec/services/credit_notes/create_from_termination_spec.rb
index 089524fd011..4681c7ac8cf 100644
--- a/spec/services/credit_notes/create_from_termination_spec.rb
+++ b/spec/services/credit_notes/create_from_termination_spec.rb
@@ -374,8 +374,6 @@
         )
       end
 
-      before { organization.vat_rate = 0 }
-
       it 'creates a credit note' do
         travel_to(terminated_at) do
           result = create_service.call
diff --git a/spec/services/customers/create_service_spec.rb b/spec/services/customers/create_service_spec.rb
index 953c61bcfbd..7b4ad8480aa 100644
--- a/spec/services/customers/create_service_spec.rb
+++ b/spec/services/customers/create_service_spec.rb
@@ -18,7 +18,6 @@
         currency: 'EUR',
         tax_identification_number: '123456789',
         billing_configuration: {
-          vat_rate: 20,
           document_locale: 'fr'
         },
         shipping_address: {
@@ -52,7 +51,6 @@
         expect(customer.timezone).to be_nil
 
         billing = create_args[:billing_configuration]
-        expect(customer.vat_rate).to eq(billing[:vat_rate])
         expect(customer.document_locale).to eq(billing[:document_locale])
         expect(customer.invoice_grace_period).to be_nil
 
@@ -83,7 +81,6 @@
         name: create_args[:name],
         currency: create_args[:currency],
         timezone: nil,
-        vat_rate: billing[:vat_rate],
         document_locale: billing[:document_locale],
         invoice_grace_period: nil
       )
@@ -129,7 +126,6 @@
           name: 'Foo Bar',
           currency: 'EUR',
           billing_configuration: {
-            vat_rate: 20,
             document_locale: 'fr'
           },
           metadata: [
@@ -256,7 +252,6 @@
             expect(result.customer).to eq(customer)
             expect(result.customer.name).to eq(create_args[:name])
             expect(result.customer.external_id).to eq(create_args[:external_id])
-            expect(result.customer.vat_rate).to eq(create_args[:billing_configuration][:vat_rate])
             expect(result.customer.document_locale).to eq(create_args[:billing_configuration][:document_locale])
           end
         end
@@ -271,7 +266,6 @@
             name: 'Foo Bar',
             currency: 'EUR',
             billing_configuration: {
-              vat_rate: 20,
               document_locale: 'fr'
             },
             metadata: [
@@ -317,7 +311,6 @@
               name: 'Foo Bar',
               currency: 'EUR',
               billing_configuration: {
-                vat_rate: 20,
                 document_locale: 'fr'
               },
               metadata: [
@@ -378,7 +371,6 @@
             name: 'Foo Bar',
             currency: 'EUR',
             billing_configuration: {
-              vat_rate: 20,
               document_locale: 'fr'
             },
             integration_customers:
@@ -582,7 +574,6 @@
             external_id: SecureRandom.uuid,
             name: 'Foo Bar',
             billing_configuration: {
-              vat_rate: 28,
               payment_provider:,
               payment_provider_code:,
               provider_customer_id: 'stripe_id'
@@ -613,7 +604,6 @@
             expect(result.customer).to eq(customer)
 
             # NOTE: It should not erase exsting properties
-            expect(result.customer.vat_rate).to eq(28)
             expect(result.customer.payment_provider).to eq('stripe')
             expect(result.customer.stripe_customer).to be_present
 
@@ -637,7 +627,6 @@
               expect(result.customer).to eq(customer)
 
               # NOTE: It should not erase existing properties
-              expect(result.customer.vat_rate).to eq(28)
               expect(result.customer.payment_provider).to eq(nil)
               expect(result.customer.stripe_customer).not_to be_present
               expect(result.customer.gocardless_customer).not_to be_present
@@ -651,7 +640,6 @@
               external_id: SecureRandom.uuid,
               name: 'Foo Bar',
               billing_configuration: {
-                vat_rate: 28,
                 sync_with_provider: true
               }
             }
@@ -668,7 +656,6 @@
               expect(result.customer).to eq(customer)
 
               # NOTE: It should not erase existing properties
-              expect(result.customer.vat_rate).to eq(28)
               expect(result.customer.payment_provider).to eq(nil)
               expect(result.customer.stripe_customer).not_to be_present
             end
@@ -807,96 +794,6 @@
       end
     end
 
-    context 'with legacy vat_rate' do
-      let(:vat_rate) { 12.5 }
-      let(:params) do
-        {
-          external_id:,
-          name: 'Foo Bar',
-          currency: 'EUR',
-          billing_configuration: {
-            vat_rate:,
-            document_locale: 'fr'
-          }
-        }
-      end
-
-      it 'assigns the vat_rate and creates a tax' do
-        result = customers_service.create_from_api(organization:, params:)
-
-        aggregate_failures do
-          expect(result.customer.vat_rate).to eq(vat_rate)
-          expect(result.customer.taxes.count).to eq(1)
-
-          tax = result.customer.taxes.first
-          expect(tax.rate).to eq(vat_rate)
-        end
-      end
-
-      context 'when customer has multiple taxes' do
-        let(:customer) { create(:customer, organization:, external_id:) }
-
-        before do
-          first_tax = create(:tax, organization:, rate: 14)
-          second_tax = create(:tax, organization:, rate: 15)
-          create(:customer_applied_tax, customer:, tax: first_tax)
-          create(:customer_applied_tax, customer:, tax: second_tax)
-        end
-
-        it 'raises a validation error' do
-          result = customers_service.create_from_api(organization:, params:)
-
-          aggregate_failures do
-            expect(result).not_to be_success
-            expect(result.error).to be_a(BaseService::ValidationFailure)
-            expect(result.error.messages[:vat_rate]).to eq(['multiple_taxes'])
-          end
-        end
-      end
-
-      context 'when customer already has a tax' do
-        let(:customer) { create(:customer, organization:, external_id:) }
-
-        before do
-          tax = create(:tax, organization:, rate: 14)
-          create(:customer_applied_tax, customer:, tax:)
-        end
-
-        it 'creates a new tax' do
-          result = customers_service.create_from_api(organization:, params:)
-
-          aggregate_failures do
-            expect(result.customer.vat_rate).to eq(vat_rate)
-            expect(result.customer.organization.taxes.count).to eq(2)
-            expect(result.customer.reload.taxes.count).to eq(1)
-          end
-        end
-      end
-
-      context 'when tax exists but is not applied yet to the customer' do
-        let(:customer) { create(:customer, organization:, external_id:) }
-        let(:vat_rate) { 20 }
-
-        before do
-          create(:tax, organization:, rate: 10, code: 'tax_10')
-          initial_tax = create(:tax, organization:, rate: 15, code: 'tax_15')
-          create(:tax, organization:, rate: 20, code: 'tax_20')
-
-          create(:customer_applied_tax, customer:, tax: initial_tax)
-        end
-
-        it 'updates the customer\'s tax' do
-          result = customers_service.create_from_api(organization:, params:)
-
-          aggregate_failures do
-            expect(result.customer.vat_rate).to eq(vat_rate)
-            expect(result.customer.taxes.count).to eq(1)
-            expect(result.customer.taxes.first.code).to eq('tax_20')
-          end
-        end
-      end
-    end
-
     context 'when organization has eu tax management' do
       let(:eu_auto_tax_service) { instance_double(Customers::EuAutoTaxesService) }
 
diff --git a/spec/services/customers/update_service_spec.rb b/spec/services/customers/update_service_spec.rb
index b926cb10445..47c15977ec7 100644
--- a/spec/services/customers/update_service_spec.rb
+++ b/spec/services/customers/update_service_spec.rb
@@ -23,9 +23,6 @@
         tax_identification_number: '2246',
         net_payment_term: 8,
         external_id:,
-        billing_configuration: {
-          vat_rate: 20
-        },
         shipping_address: {
           city: 'Paris'
         }
@@ -40,9 +37,6 @@
         expect(updated_customer.name).to eq('Updated customer name')
         expect(updated_customer.tax_identification_number).to eq('2246')
 
-        billing = update_args[:billing_configuration]
-        expect(updated_customer.vat_rate).to eq(billing[:vat_rate])
-
         shipping_address = update_args[:shipping_address]
         expect(updated_customer.shipping_city).to eq(shipping_address[:city])
       end
@@ -74,24 +68,6 @@
       end
     end
 
-    context 'without billing configuration namespace' do
-      let(:update_args) do
-        {
-          id: customer.id,
-          name: 'Updated customer name',
-          external_id:,
-          invoice_grace_period: 3,
-          vat_rate: 20
-        }
-      end
-
-      it 'updates billing information' do
-        result = customers_service.update(**update_args)
-
-        expect(result.customer.vat_rate).to eq(update_args[:vat_rate])
-      end
-    end
-
     context 'with metadata' do
       let(:customer_metadata) { create(:customer_metadata, customer:) }
       let(:another_customer_metadata) { create(:customer_metadata, customer:, key: 'test', value: '1') }
diff --git a/spec/services/organizations/update_service_spec.rb b/spec/services/organizations/update_service_spec.rb
index e2c73759852..bfb6247851e 100644
--- a/spec/services/organizations/update_service_spec.rb
+++ b/spec/services/organizations/update_service_spec.rb
@@ -161,96 +161,6 @@
       end
     end
 
-    context 'with legacy vat_rate' do
-      let(:vat_rate) { 12.5 }
-      let(:params) do
-        {
-          webhook_url: 'http://foo.bar',
-          legal_name: 'Foobar',
-          legal_number: '1234',
-          email: 'foo@bar.com',
-          address_line1: 'Line 1',
-          address_line2: 'Line 2',
-          state: 'Foobar',
-          zipcode: 'FOO1234',
-          city: 'Foobar',
-          country:,
-          timezone:,
-          logo:,
-          email_settings:,
-          billing_configuration: {
-            vat_rate:,
-            invoice_footer: 'invoice footer',
-            document_locale: 'fr',
-            invoice_grace_period:
-          }
-        }
-      end
-
-      it 'assigns the vat_rate and creates a tax_rate' do
-        result = update_service.call
-
-        aggregate_failures do
-          expect(result.organization.vat_rate).to eq(12.5)
-
-          expect(result.organization.taxes.count).to eq(1)
-
-          tax_rate = result.organization.taxes.first
-          expect(tax_rate.rate).to eq(12.5)
-        end
-      end
-
-      context 'when organization already have a tax rate' do
-        before { create(:tax, organization:, rate: 14) }
-
-        it 'create a new tax_rate' do
-          result = update_service.call
-
-          aggregate_failures do
-            expect(result.organization.vat_rate).to eq(12.5)
-
-            expect(result.organization.taxes.count).to eq(2)
-            expect(result.organization.taxes.applied_to_organization.count).to eq(1)
-
-            tax_rate = result.organization.taxes.applied_to_organization.first
-            expect(tax_rate.rate).to eq(12.5)
-          end
-        end
-
-        context 'with vat_rate equals to 0' do
-          let(:vat_rate) { 0 }
-
-          it 'toggle the applied_to_organization flag' do
-            result = update_service.call
-
-            aggregate_failures do
-              expect(result.organization.vat_rate).to eq(0)
-
-              expect(result.organization.taxes.count).to eq(1)
-              expect(result.organization.taxes.applied_to_organization.count).to eq(0)
-            end
-          end
-        end
-      end
-
-      context 'when organization have multiple tax rates' do
-        before do
-          create(:tax, organization:, rate: 14)
-          create(:tax, organization:, rate: 15)
-        end
-
-        it 'raises a validation error' do
-          result = update_service.call
-
-          aggregate_failures do
-            expect(result).not_to be_success
-            expect(result.error).to be_a(BaseService::ValidationFailure)
-            expect(result.error.messages[:vat_rate]).to eq(['multiple_taxes'])
-          end
-        end
-      end
-    end
-
     context 'with eu tax management' do
       context 'with org within the EU' do
         let(:params) { {eu_tax_management: true, country: 'fr'} }
diff --git a/spec/services/webhooks/invoices/generated_service_spec.rb b/spec/services/webhooks/invoices/generated_service_spec.rb
index 26527926494..e704ed5bcbe 100644
--- a/spec/services/webhooks/invoices/generated_service_spec.rb
+++ b/spec/services/webhooks/invoices/generated_service_spec.rb
@@ -11,6 +11,6 @@
   let(:organization) { create(:organization) }
 
   describe '.call' do
-    it_behaves_like 'creates webhook', 'invoice.generated', 'invoice', {'amount_cents' => Integer}
+    it_behaves_like 'creates webhook', 'invoice.generated', 'invoice', {'fees_amount_cents' => Integer}
   end
 end