diff --git a/src/pretix/base/addressvalidation.py b/src/pretix/base/addressvalidation.py
index 4dd1fc8cf6..62b89055e5 100644
--- a/src/pretix/base/addressvalidation.py
+++ b/src/pretix/base/addressvalidation.py
@@ -85,7 +85,7 @@ COUNTRIES_WITH_STREET_ZIPCODE_AND_CITY_REQUIRED = {
 }
 
 
-def validate_address(address: dict):
+def validate_address(address: dict, all_optional=False):
     """
     :param address: A dictionary with at least the entries ``street``, ``zipcode``, ``city``, ``country``,
                     ``state``
@@ -100,10 +100,10 @@ def validate_address(address: dict):
     if not address.get('country'):
         raise ValidationError({'country': [_('This field is required.')]})
 
-    if str(address['country']) in COUNTRIES_WITH_STATE_IN_ADDRESS and not address.get('state'):
+    if str(address['country']) in COUNTRIES_WITH_STATE_IN_ADDRESS and not address.get('state') and not all_optional:
         raise ValidationError({'state': [_('This field is required.')]})
 
-    if str(address['country']) in COUNTRIES_WITH_STREET_ZIPCODE_AND_CITY_REQUIRED:
+    if str(address['country']) in COUNTRIES_WITH_STREET_ZIPCODE_AND_CITY_REQUIRED and not all_optional:
         for f in ('street', 'zipcode', 'city'):
             if not address.get(f):
                 raise ValidationError({f: [_('This field is required.')]})
@@ -111,7 +111,8 @@ def validate_address(address: dict):
     for klass in _validator_classes[str(address['country'])]:
         validator = klass()
         try:
-            address['zipcode'] = validator.validate_zipcode(address['zipcode'])
+            if address.get('zipcode'):
+                address['zipcode'] = validator.validate_zipcode(address['zipcode'])
         except ValidationError as e:
             raise ValidationError({'zipcode': list(e)})
 
diff --git a/src/pretix/base/forms/questions.py b/src/pretix/base/forms/questions.py
index eb3e72f29a..23ac056a35 100644
--- a/src/pretix/base/forms/questions.py
+++ b/src/pretix/base/forms/questions.py
@@ -1074,7 +1074,7 @@ class BaseInvoiceAddressForm(forms.ModelForm):
             self.instance.vat_id_validated = False
 
         if self.address_validation:
-            self.cleaned_data = data = validate_address(data)
+            self.cleaned_data = data = validate_address(data, self.all_optional)
 
         self.instance.name_parts = data.get('name_parts')
 
diff --git a/src/tests/base/test_addressvalidation.py b/src/tests/base/test_addressvalidation.py
index b330a751c4..b8e26edc82 100644
--- a/src/tests/base/test_addressvalidation.py
+++ b/src/tests/base/test_addressvalidation.py
@@ -26,29 +26,49 @@ from pretix.base.addressvalidation import validate_address
 
 
 @pytest.mark.parametrize(
-    "input,output",
+    "input,output,all_optional",
     [
         # No address is allowed
-        ({"name": "Peter"}, {"name": "Peter"}),
+        ({"name": "Peter"}, {"name": "Peter"}, False),
         # Country must be given if any part of the address is filled
-        ({"street": "Main Street"}, {"country": ["This field is required."]}),
+        ({"street": "Main Street"}, {"country": ["This field is required."]}, False),
         # Country without any semantic validation
         (
             {"street": "Main Street", "country": "CR"},
             {"street": "Main Street", "country": "CR"},
+            False,
         ),
         # Country that requires all fields except state to be filled
         (
             {"street": "Main Street", "country": "DE"},
             {"zipcode": ["This field is required."]},
+            False,
         ),
         (
             {"street": "Main Street", "country": "DE", "zipcode": "12345"},
             {"city": ["This field is required."]},
+            False,
         ),
         (
             {"city": "Heidelberg", "country": "DE", "zipcode": "12345"},
             {"street": ["This field is required."]},
+            False,
+        ),
+        # All-optional flag works
+        (
+            {"street": "Main Street", "country": "DE"},
+            {"street": "Main Street", "country": "DE"},
+            True,
+        ),
+        (
+            {"street": "Main Street", "country": "DE", "zipcode": "12345"},
+            {"street": "Main Street", "country": "DE", "zipcode": "12345"},
+            True,
+        ),
+        (
+            {"city": "Heidelberg", "country": "DE", "zipcode": "12345"},
+            {"city": "Heidelberg", "country": "DE", "zipcode": "12345"},
+            True,
         ),
         (
             {
@@ -58,6 +78,7 @@ from pretix.base.addressvalidation import validate_address
                 "zipcode": "12345",
             },
             True,
+            False,
         ),
         # Country that requires state to be filled
         (
@@ -68,6 +89,7 @@ from pretix.base.addressvalidation import validate_address
                 "zipcode": "12345",
             },
             {"state": ["This field is required."]},
+            False,
         ),
         # Country with zip code validation inherited from django-localflavor
         (
@@ -78,6 +100,7 @@ from pretix.base.addressvalidation import validate_address
                 "zipcode": "ABCDE",
             },
             {"zipcode": ["Enter a zip code in the format XXXXX."]},
+            False,
         ),
         # Country with zip code validation implemented directly
         (
@@ -88,6 +111,7 @@ from pretix.base.addressvalidation import validate_address
                 "zipcode": "ABCDE",
             },
             {"zipcode": ["Enter a postal code in the format XXX."]},
+            False,
         ),
         # Country with zip code normalization inherited from django-localflavor
         (
@@ -103,12 +127,13 @@ from pretix.base.addressvalidation import validate_address
                 "country": "GB",
                 "zipcode": "SE1 9DE",
             },
+            False,
         ),
     ],
 )
-def test_validate_address(input, output):
+def test_validate_address(input, output, all_optional):
     try:
-        actual_output = validate_address(input)
+        actual_output = validate_address(input, all_optional)
     except ValidationError as e:
         assert {
             k: ["".join(s for s in e) for e in v] for k, v in e.error_dict.items()