As low as displays incorrect pricing on category page, tax appears to be added twice #21383

[Jitheesh]

Description (*)

While calculating minimal price, MinimalTierPriceCalculator is applying tax twice.

magento2/app/code/Magento/Catalog/Pricing/Price/MinimalTierPriceCalculator.php

Lines 35 to 49 in 94383aa

	public function getValue(SaleableInterface $saleableItem)
	{
	/** @var TierPrice $price */
	$price = $saleableItem->getPriceInfo()->getPrice(TierPrice::PRICE_CODE);
	$tierPriceList = $price->getTierPriceList();
	$tierPrices = [];
	foreach ($tierPriceList as $tierPrice) {
	/** @var AmountInterface $price */
	$price = $tierPrice['price'];
	$tierPrices[] = $price->getValue();
	}
	return $tierPrices ? min($tierPrices) : null;
	}

Above function is returning minimum price with tax, and then Magento is applying tax again while returning calculated amount of minimum price

magento2/app/code/Magento/Catalog/Pricing/Price/MinimalTierPriceCalculator.php

Lines 55 to 63 in 94383aa

	public function getAmount(SaleableInterface $saleableItem)
	{
	$value = $this->getValue($saleableItem);
	return $value === null
	? null
	: $this->calculator->getAmount($value, $saleableItem);
	}
	}

Issue can be fixed by excluding 'tax' while calculating return amount.

Fixed Issues (if relevant)

1. As low as displays incorrect pricing on category page, tax appears to be added twice #21383: As low as displays incorrect pricing on category page, tax appears to be added twice

Manual testing scenarios (*)

1. Create tax rules & rates
   1.1 Add 20% tax rate for UK shipping address
2. Create product with tier price and tax class
3. Set Stores->Configuration->Sales->Tax->Price Display Settings->Display Product Prices In Catalog to "Including and Excluding Tax".
4. Create an account and add UK shipping as default address
5. Check category listing page for newly created item
6. Verify As low as price, it should be minimum tier price + tax

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @Jitheesh. Thank you for your contribution
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[Jitheesh]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @Jitheesh. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @Jitheesh, here is your new Magento instance.
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Login: admin Password: 123123q

[rogyar]

• @magento-engcom-team give me test instance

[magento-engcom-team]

Hi @rogyar. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @rogyar, here is your new Magento instance.
Admin access: https://pr-21395.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-4360 has been created to process this Pull Request

[magento-engcom-team]

@Jitheesh thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

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