diff --git a/modules/rtbhouseBidAdapter.js b/modules/rtbhouseBidAdapter.js
index 9f498014a8e..c01ce5e7db7 100644
--- a/modules/rtbhouseBidAdapter.js
+++ b/modules/rtbhouseBidAdapter.js
@@ -56,7 +56,7 @@ export const spec = {
       site: mapSite(validBidRequests, bidderRequest),
       cur: DEFAULT_CURRENCY_ARR,
       test: validBidRequests[0].params.test || 0,
-      source: mapSource(validBidRequests[0]),
+      source: mapSource(validBidRequests[0], bidderRequest),
     };
 
     if (bidderRequest && bidderRequest.gdprConsent && bidderRequest.gdprConsent.gdprApplies) {
@@ -228,6 +228,13 @@ function mapImpression(slot, bidderRequest) {
       delete imp.ext.ae;
     }
   }
+
+  const tid = deepAccess(slot, 'ortb2Imp.ext.tid');
+  if (tid) {
+    imp.ext = imp.ext || {};
+    imp.ext.tid = tid;
+  }
+
   return imp;
 }
 
@@ -283,9 +290,9 @@ function mapSite(slot, bidderRequest) {
  * @param {object} slot Ad Unit Params by Prebid
  * @returns {object} Source by OpenRTB 2.5 §3.2.2
  */
-function mapSource(slot) {
+function mapSource(slot, bidderRequest) {
   const source = {
-    tid: slot.transactionId,
+    tid: bidderRequest?.auctionId || '',
   };
 
   return source;
diff --git a/test/spec/modules/rtbhouseBidAdapter_spec.js b/test/spec/modules/rtbhouseBidAdapter_spec.js
index 6d41df7605b..792d3ab0a9e 100644
--- a/test/spec/modules/rtbhouseBidAdapter_spec.js
+++ b/test/spec/modules/rtbhouseBidAdapter_spec.js
@@ -53,16 +53,18 @@ describe('RTBHouseAdapter', () => {
 
   describe('buildRequests', function () {
     let bidRequests;
-    const bidderRequest = {
-      'refererInfo': {
-        'numIframes': 0,
-        'reachedTop': true,
-        'referer': 'https://example.com',
-        'stack': ['https://example.com']
-      }
-    };
+    let bidderRequest;
 
     beforeEach(() => {
+      bidderRequest = {
+        'auctionId': 'bidderrequest-auction-id',
+        'refererInfo': {
+          'numIframes': 0,
+          'reachedTop': true,
+          'referer': 'https://example.com',
+          'stack': ['https://example.com']
+        }
+      };
       bidRequests = [
         {
           'bidder': 'rtbhouse',
@@ -82,6 +84,11 @@ describe('RTBHouseAdapter', () => {
           'bidderRequestId': '22edbae2733bf6',
           'auctionId': '1d1a030790a475',
           'transactionId': 'example-transaction-id',
+          'ortb2Imp': {
+            'ext': {
+              'tid': 'ortb2Imp-transaction-id-1'
+            }
+          },
           'schain': {
             'ver': '1.0',
             'complete': 1,
@@ -203,7 +210,7 @@ describe('RTBHouseAdapter', () => {
       const bidRequest = Object.assign([], bidRequests);
       const request = spec.buildRequests(bidRequest, bidderRequest);
       const data = JSON.parse(request.data);
-      expect(data.source.tid).to.equal('example-transaction-id');
+      expect(data.source.tid).to.equal('bidderrequest-auction-id');
     });
 
     it('should include bidfloor from floor module if avaiable', () => {
@@ -256,6 +263,13 @@ describe('RTBHouseAdapter', () => {
       expect(data.source).to.have.deep.property('tid');
     });
 
+    it('should include impression level transaction id when provided', () => {
+      const bidRequest = Object.assign([], bidRequests);
+      const request = spec.buildRequests(bidRequest, bidderRequest);
+      const data = JSON.parse(request.data);
+      expect(data.imp[0].ext.tid).to.equal('ortb2Imp-transaction-id-1');
+    });
+
     it('should not include invalid schain', () => {
       const bidRequest = Object.assign([], bidRequests);
       bidRequest[0].schain = {