From d7f22c48408bf10202614b93c49f82be280b03c9 Mon Sep 17 00:00:00 2001
From: Matthew O'Loughlin <matthew.oloughlin@aligent.com.au>
Date: Fri, 31 Jan 2020 15:09:27 +1030
Subject: [PATCH] GH-26597: Also calculate tax discount compensation amount
 when prices are configured to be exclusive of tax.

---
 .../Tax/Model/Calculation/AbstractAggregateCalculator.php        | 1 +
 1 file changed, 1 insertion(+)

diff --git a/app/code/Magento/Tax/Model/Calculation/AbstractAggregateCalculator.php b/app/code/Magento/Tax/Model/Calculation/AbstractAggregateCalculator.php
index 939facd02c02d..acd2fd43a7e15 100644
--- a/app/code/Magento/Tax/Model/Calculation/AbstractAggregateCalculator.php
+++ b/app/code/Magento/Tax/Model/Calculation/AbstractAggregateCalculator.php
@@ -155,6 +155,7 @@ protected function calculateWithTaxNotInPrice(QuoteDetailsItemInterface $item, $
         $rowTax = array_sum($rowTaxes);
         $rowTaxBeforeDiscount = array_sum($rowTaxesBeforeDiscount);
         $rowTotalInclTax = $rowTotal + $rowTaxBeforeDiscount;
+        $discountTaxCompensationAmount = $rowTaxBeforeDiscount - $rowTax;
         $priceInclTax = $rowTotalInclTax / $quantity;
 
         if ($round) {