diff --git a/src/tests/presale/test_checkout.py b/src/tests/presale/test_checkout.py
index 719d991d74..caf6c63f33 100644
--- a/src/tests/presale/test_checkout.py
+++ b/src/tests/presale/test_checkout.py
@@ -418,8 +418,8 @@ class CheckoutTestCase(TestCase):
 
     def test_custom_tax_rules(self):
         self.tr19.custom_rules = json.dumps([
-            {'country': 'AT', 'address_type': '', 'action': 'vat'},
-            {'country': 'ZZ', 'address_type': '', 'action': 'reverse'},
+            {'country': 'AT', 'address_type': 'business_vat_id', 'action': 'reverse'},
+            {'country': 'ZZ', 'address_type': '', 'action': 'vat'},
         ])
         self.tr19.save()
         self.event.settings.invoice_address_vatid = True
@@ -444,22 +444,24 @@ class CheckoutTestCase(TestCase):
             }, follow=True)
 
         cr1.refresh_from_db()
-        assert cr1.price == Decimal('23.00')
+        assert cr1.price == Decimal('19.33')
 
-        self.client.post('/%s/%s/checkout/questions/' % (self.orga.slug, self.event.slug), {
-            'is_business': 'business',
-            'company': 'Foo',
-            'name': 'Bar',
-            'street': 'Baz',
-            'zipcode': '12345',
-            'city': 'Here',
-            'country': 'DE',
-            'vat_id': 'DE123456',
-            'email': 'admin@localhost'
-        }, follow=True)
+        with mock.patch('vat_moss.id.validate') as mock_validate:
+            mock_validate.return_value = ('DE', 'DE123456', 'Foo')
+            self.client.post('/%s/%s/checkout/questions/' % (self.orga.slug, self.event.slug), {
+                'is_business': 'business',
+                'company': 'Foo',
+                'name': 'Bar',
+                'street': 'Baz',
+                'zipcode': '12345',
+                'city': 'Here',
+                'country': 'DE',
+                'vat_id': 'DE123456',
+                'email': 'admin@localhost'
+            }, follow=True)
 
         cr1.refresh_from_db()
-        assert cr1.price == Decimal('19.33')
+        assert cr1.price == Decimal('23.00')
 
     def test_question_file_upload(self):
         q1 = Question.objects.create(