diff --git a/engine/Shopware/Core/sBasket.php b/engine/Shopware/Core/sBasket.php
index f0ae1f75aba..b54105b4c5b 100644
--- a/engine/Shopware/Core/sBasket.php
+++ b/engine/Shopware/Core/sBasket.php
@@ -421,7 +421,7 @@ public function sInsertDiscount()
             $tax = $this->config->get('sDISCOUNTTAX');
         }
 
-        if (!$tax) {
+        if (!$tax && $tax != 0) {
             $tax = 19;
         }
 
diff --git a/tests/Functional/Bundle/StoreFrontBundle/Helper.php b/tests/Functional/Bundle/StoreFrontBundle/Helper.php
index 44161f50c25..3f02dabb043 100644
--- a/tests/Functional/Bundle/StoreFrontBundle/Helper.php
+++ b/tests/Functional/Bundle/StoreFrontBundle/Helper.php
@@ -27,6 +27,8 @@
 
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\DBAL\Connection;
+use Doctrine\ORM\Exception\ORMException;
+use Doctrine\ORM\OptimisticLockException;
 use Enlight_Components_Db_Adapter_Pdo_Mysql;
 use Shopware\Bundle\StoreFrontBundle\Service\ListProductServiceInterface;
 use Shopware\Bundle\StoreFrontBundle\Struct\Customer\Group as CustomerGroupStruct;
@@ -45,11 +47,15 @@
 use Shopware\Models\Article\Configurator\Option;
 use Shopware\Models\Article\Supplier;
 use Shopware\Models\Category\Category;
+use Shopware\Models\Customer\Customer;
+use Shopware\Models\Customer\Discount as CustomerDiscount;
+use Shopware\Models\Customer\Group;
 use Shopware\Models\Customer\Group as CustomerGroup;
 use Shopware\Models\Price\Discount;
 use Shopware\Models\Price\Group as PriceGroup;
 use Shopware\Models\Shop\Currency;
 use Shopware\Models\Shop\Shop as ShopModel;
+use Shopware\Models\Tax\Rule as TaxRule;
 use Shopware\Models\Tax\Tax as TaxModel;
 use Shopware\Tests\Functional\Bundle\StoreFrontBundle\Helper\ProgressHelper;
 use Shopware_Components_Config;
@@ -361,6 +367,40 @@ public function createTax(array $data = []): TaxModel
         return $tax;
     }
 
+    /**
+     * @param array<string, string|int|Customer|Group|bool> $data
+     *
+     * @throws ORMException
+     * @throws OptimisticLockException
+     */
+    public function createTaxRule(array $data): TaxRule
+    {
+        $taxRule = new TaxRule();
+        $taxRule->fromArray($data);
+
+        $this->entityManager->persist($taxRule);
+        $this->entityManager->flush();
+
+        return $taxRule;
+    }
+
+    /**
+     * @param array<string, string|int|Customer|Group|bool> $data
+     *
+     * @throws OptimisticLockException
+     * @throws ORMException
+     */
+    public function createCustomerGroupDiscount(array $data): CustomerDiscount
+    {
+        $customerDiscount = new CustomerDiscount();
+        $customerDiscount->fromArray($data);
+
+        $this->entityManager->persist($customerDiscount);
+        $this->entityManager->flush();
+
+        return $customerDiscount;
+    }
+
     public function createCurrency(array $data = []): Currency
     {
         $currency = new Currency();
diff --git a/tests/Functional/Core/BasketTest.php b/tests/Functional/Core/BasketTest.php
index a41de4350ce..4d00c07d399 100644
--- a/tests/Functional/Core/BasketTest.php
+++ b/tests/Functional/Core/BasketTest.php
@@ -40,6 +40,9 @@
 use Shopware\Components\Random;
 use Shopware\Models\Article\Detail;
 use Shopware\Models\Customer\Customer;
+use Shopware\Models\Customer\Discount as CustomerGroupDiscount;
+use Shopware\Models\Customer\Group as CustomerGroup;
+use Shopware\Models\Tax\Rule as TaxRule;
 use Shopware\Tests\Functional\Bundle\StoreFrontBundle\Helper;
 use Shopware\Tests\Functional\Helper\Utils;
 use Shopware\Tests\Functional\Traits\ContainerTrait;
@@ -156,6 +159,44 @@ public function testsCheckBasketQuantitiesWithLowerQuantityThanAvailable(): void
         static::assertFalse($result['articles'][$inStockProduct['ordernumber']]['OutOfStock']);
     }
 
+    public function testInsertDiscountWithTaxFreeTaxRule(): void
+    {
+        $this->generateBasketSession();
+
+        $customerGroupRepo = $this->getContainer()->get('models')->getRepository(CustomerGroup::class);
+        $customerGroup = $customerGroupRepo->findOneBy(['key' => 'EK']);
+        static::assertInstanceOf(CustomerGroup::class, $customerGroup);
+
+        $taxRule = $this->createTaxFreeTaxRule($customerGroup);
+        $customerGroupDiscount = $this->createCustomerGroupDiscount($customerGroup);
+
+        $this->module->sAddArticle('SW10003');
+        $this->module->sInsertDiscount();
+
+        $discount = $this->connection->fetchAssociative(
+            'SELECT * FROM s_order_basket WHERE sessionID = :sessionId AND ordernumber = :ordernumber',
+            [
+                'sessionId' => $this->getSessionId(),
+                'ordernumber' => 'sw-discount',
+            ]
+        );
+
+        static::assertIsArray($discount);
+        static::assertSame(0, (int) $discount['tax_rate']);
+
+        // Housekeeping
+        $this->connection->delete(
+            's_order_basket',
+            ['sessionID' => $this->getSessionId()]
+        );
+
+        $modelManager = $this->getContainer()->get('models');
+        $modelManager->remove($taxRule);
+        $modelManager->remove($customerGroupDiscount);
+
+        $modelManager->flush();
+    }
+
     public function testsCheckBasketQuantitiesWithHigherQuantityThanAvailable(): void
     {
         $this->generateBasketSession();
@@ -2677,4 +2718,27 @@ private function getSessionId(): string
     {
         return $this->session->get('sessionId');
     }
+
+    private function createTaxFreeTaxRule(CustomerGroup $group): TaxRule
+    {
+        $resourceHelper = new Helper($this->getContainer());
+
+        return $resourceHelper->createTaxRule([
+            'name' => 'PHPUNIT-TAX-FREE',
+            'active' => true,
+            'customerGroup' => $group,
+            'groupId' => 1,
+        ]);
+    }
+
+    private function createCustomerGroupDiscount(CustomerGroup $group): CustomerGroupDiscount
+    {
+        $resourceHelper = new Helper($this->getContainer());
+
+        return $resourceHelper->createCustomerGroupDiscount([
+            'group' => $group,
+            'discount' => 1,
+            'value' => 2,
+        ]);
+    }
 }