diff --git a/src/pretix/base/settings.py b/src/pretix/base/settings.py
index 7c57318173..c2422fe692 100644
--- a/src/pretix/base/settings.py
+++ b/src/pretix/base/settings.py
@@ -690,6 +690,7 @@ DEFAULTS = {
             label=_("Minimum length of invoice number after prefix"),
             help_text=_("The part of your invoice number after your prefix will be filled up with leading zeros up to this length, e.g. INV-001 or INV-00001."),
             max_value=12,
+            min_value=1,
             required=True,
         )
     },
@@ -725,8 +726,9 @@ DEFAULTS = {
                     message=lazy(lambda *args: _('Please only use the characters {allowed} in this field.').format(
                         allowed='A-Z, a-z, 0-9, -./:#'
                     ), str)()
-                )
+                ),
             ],
+            max_length=155,
         )
     },
     'invoice_numbers_prefix_cancellations': {
@@ -747,8 +749,9 @@ DEFAULTS = {
                     message=lazy(lambda *args: _('Please only use the characters {allowed} in this field.').format(
                         allowed='A-Z, a-z, 0-9, -./:#'
                     ), str)()
-                )
+                ),
             ],
+            max_length=155,
         )
     },
     'invoice_renderer_highlight_order_code': {
@@ -1203,6 +1206,7 @@ DEFAULTS = {
         'form_class': forms.CharField,
         'serializer_class': serializers.CharField,
         'form_kwargs': dict(
+            max_length=190,
             label=_("Company name"),
         )
     },
@@ -1216,6 +1220,7 @@ DEFAULTS = {
                 'placeholder': '12345'
             }),
             label=_("ZIP code"),
+            max_length=190,
         )
     },
     'invoice_address_from_city': {
@@ -1228,6 +1233,7 @@ DEFAULTS = {
                 'placeholder': _('Random City')
             }),
             label=_("City"),
+            max_length=190,
         )
     },
     'invoice_address_from_state': {
@@ -1264,7 +1270,8 @@ DEFAULTS = {
         'serializer_class': serializers.CharField,
         'form_kwargs': dict(
             label=_("Domestic tax ID"),
-            help_text=_("e.g. tax number in Germany, ABN in Australia, …")
+            help_text=_("e.g. tax number in Germany, ABN in Australia, …"),
+            max_length=190,
         )
     },
     'invoice_address_from_vat_id': {
@@ -1274,6 +1281,7 @@ DEFAULTS = {
         'serializer_class': serializers.CharField,
         'form_kwargs': dict(
             label=_("EU VAT ID"),
+            max_length=190,
         )
     },
     'invoice_introductory_text': {
diff --git a/src/pretix/control/forms/event.py b/src/pretix/control/forms/event.py
index fbfdb08fed..8402d35e21 100644
--- a/src/pretix/control/forms/event.py
+++ b/src/pretix/control/forms/event.py
@@ -42,7 +42,6 @@ import pycountry
 from django import forms
 from django.conf import settings
 from django.core.exceptions import NON_FIELD_ERRORS, ValidationError
-from django.core.validators import MaxValueValidator
 from django.db.models import Prefetch, Q, prefetch_related_objects
 from django.forms import formset_factory, inlineformset_factory
 from django.urls import reverse
@@ -1000,8 +999,6 @@ class InvoiceSettingsForm(EventSettingsValidationMixin, SettingsForm):
         self.fields['invoice_generate_sales_channels'].choices = (
             (c.identifier, c.label) for c in event.organizer.sales_channels.all()
         )
-        self.fields['invoice_numbers_counter_length'].validators.append(MaxValueValidator(15))
-
         pps = [str(pp.verbose_name) for pp in event.get_payment_providers().values() if pp.requires_invoice_immediately]
         if pps:
             generate_paid_help_text = _('An invoice will be issued before payment if the customer selects one of the following payment methods: {list}').format(