Allow more decimal places for tax rates

src/pretix/api/serializers/__init__.py

@@ -20,6 +20,7 @@
 # <https://www.gnu.org/licenses/>.
 #
 import json
+import re
 
 from django.db.models import prefetch_related_objects
 from rest_framework import serializers
@@ -135,3 +136,30 @@ class SalesChannelMigrationMixin:
         else:
             value["sales_channels"] = value["limit_sales_channels"]
         return value
+
+
+class CompatDecimalField(serializers.DecimalField):
+    """
+    Historically, pretix recorded tax rates as decimals with two places. Today, pretix supports tax rates with up to
+    four places. Since our API outputs decimals with the stored precision, this would have changed the API output from
+    "19.00" to "19.0000" without warning. While this is semantically the same thing, we need to assume some pretix API
+    users might run into trouble, either because they treat the value as a string and then map something
+    (e.g. ``if tax_rate == "19.00"``) or process it with a language where this is a significant difference. For example,
+    while in Python ``Decimal("19.00") == Decimal("19.0000")`` is true, in Java
+    ``(new BigDecimal("19.00")).equals(new BigDecimal("19.0000"))`` is false and only
+    ``(new BigDecimal("19.00")).compareTo(new BigDecimal("19.0000")) == 0`` is true.
+
+    Therefore, we stay backwards compatible by outputting two decimal places *as long as the trailing digits are zero-valued.
+    """
+
+    regex = re.compile(r"^([0-9]+\.[0-9]{2})0+$")
+
+    def to_representation(self, value):
+        if self.localize:
+            raise ValueError("localization not supported")
+        value = super().to_representation(value)
+        if value and "." not in value:
+            return f"{value}.00"
+        if m := self.regex.match(value):
+            return m.group(1)
+        return value

src/pretix/api/serializers/event.py

@@ -48,7 +48,7 @@ from rest_framework.fields import ChoiceField, Field
 from rest_framework.relations import SlugRelatedField
 
 from pretix.api.serializers import (
-    CompatibleJSONField, SalesChannelMigrationMixin,
+    CompatDecimalField, CompatibleJSONField, SalesChannelMigrationMixin,
 )
 from pretix.api.serializers.fields import PluginsField
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
@@ -681,6 +681,7 @@ class TaxRuleSerializer(CountryFieldMixin, I18nAwareModelSerializer):
         required=False,
         allow_null=True,
     )
+    rate = CompatDecimalField(max_digits=7, decimal_places=4)
 
     class Meta:
         model = TaxRule

src/pretix/api/serializers/item.py

@@ -42,7 +42,9 @@ from django.utils.functional import cached_property, lazy
 from django.utils.translation import gettext_lazy as _
 from rest_framework import serializers
 
-from pretix.api.serializers import SalesChannelMigrationMixin
+from pretix.api.serializers import (
+    CompatDecimalField, SalesChannelMigrationMixin,
+)
 from pretix.api.serializers.event import MetaDataField
 from pretix.api.serializers.fields import UploadedFileField
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
@@ -276,10 +278,10 @@ class ItemAddOnSerializer(serializers.ModelSerializer):
         return value
 
 
-class ItemTaxRateField(serializers.Field):
+class ItemTaxRateField(CompatDecimalField):
     def to_representation(self, i):
         if i.tax_rule:
-            return str(Decimal(i.tax_rule.rate))
+            return super().to_representation(Decimal(i.tax_rule.rate))
         else:
             return str(Decimal('0.00'))
 
@@ -289,7 +291,7 @@ class ItemSerializer(SalesChannelMigrationMixin, I18nAwareModelSerializer):
     bundles = InlineItemBundleSerializer(many=True, required=False)
     variations = InlineItemVariationSerializer(many=True, required=False)
     program_times = InlineItemProgramTimeSerializer(many=True, required=False)
-    tax_rate = ItemTaxRateField(source='*', read_only=True)
+    tax_rate = ItemTaxRateField(source='*', read_only=True, max_digits=7, decimal_places=4)
     meta_data = MetaDataField(required=False, source='*')
     picture = UploadedFileField(required=False, allow_null=True, allowed_types=(
         'image/png', 'image/jpeg', 'image/gif'

src/pretix/api/serializers/order.py

@@ -41,7 +41,7 @@ from rest_framework.exceptions import ValidationError
 from rest_framework.relations import SlugRelatedField
 from rest_framework.reverse import reverse
 
-from pretix.api.serializers import CompatibleJSONField
+from pretix.api.serializers import CompatDecimalField, CompatibleJSONField
 from pretix.api.serializers.event import SubEventSerializer
 from pretix.api.serializers.forms import form_field_to_serializer_field
 from pretix.api.serializers.i18n import I18nAwareModelSerializer
@@ -591,6 +591,7 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
     country = CompatibleCountryField(source='*')
     attendee_name = serializers.CharField(required=False)
     plugin_data = OrderPositionPluginDataField(source='*', allow_null=True, read_only=True)
+    tax_rate = CompatDecimalField(max_digits=7, decimal_places=4)
 
     class Meta:
         list_serializer_class = OrderPositionListSerializer
@@ -747,6 +748,8 @@ class OrderPaymentDateField(serializers.DateField):
 
 
 class OrderFeeSerializer(I18nAwareModelSerializer):
+    tax_rate = CompatDecimalField(max_digits=7, decimal_places=4)
+
     class Meta:
         model = OrderFee
         fields = ('id', 'fee_type', 'value', 'description', 'internal_type', 'tax_rate', 'tax_value', 'tax_rule',
@@ -1897,6 +1900,7 @@ class InlineInvoiceLineSerializer(I18nAwareModelSerializer):
     position = LinePositionField(read_only=True)
     event_date_from = serializers.DateTimeField(read_only=True, source="period_start")
     event_date_to = serializers.DateTimeField(read_only=True, source="period_end")
+    tax_rate = CompatDecimalField(max_digits=7, decimal_places=4)
 
     class Meta:
         model = InvoiceLine
@@ -1980,6 +1984,7 @@ class BlockedTicketSecretSerializer(I18nAwareModelSerializer):
 
 class TransactionSerializer(I18nAwareModelSerializer):
     order = serializers.SlugRelatedField(slug_field="code", read_only=True)
+    tax_rate = CompatDecimalField(max_digits=7, decimal_places=4)
 
     class Meta:
         model = Transaction

src/pretix/base/migrations/0299_tax_rate_decimals.py

@@ -0,0 +1,48 @@
+# Generated by Django 5.2.12 on 2026-04-15 20:10
+
+from decimal import Decimal
+
+from django.db import migrations, models
+
+import pretix.helpers.models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0298_pluggable_permissions'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='cartposition',
+            name='tax_rate',
+            field=pretix.helpers.models.NormalizedDecimalField(decimal_places=4, default=Decimal('0'), max_digits=7),
+        ),
+        migrations.AlterField(
+            model_name='invoiceline',
+            name='tax_rate',
+            field=pretix.helpers.models.NormalizedDecimalField(decimal_places=4, default=Decimal('0'), max_digits=7),
+        ),
+        migrations.AlterField(
+            model_name='orderfee',
+            name='tax_rate',
+            field=pretix.helpers.models.NormalizedDecimalField(decimal_places=4, max_digits=7),
+        ),
+        migrations.AlterField(
+            model_name='orderposition',
+            name='tax_rate',
+            field=pretix.helpers.models.NormalizedDecimalField(decimal_places=4, max_digits=7),
+        ),
+        migrations.AlterField(
+            model_name='transaction',
+            name='tax_rate',
+            field=pretix.helpers.models.NormalizedDecimalField(decimal_places=4, max_digits=7),
+        ),
+        migrations.AlterField(
+            model_name='taxrule',
+            name='rate',
+            field=pretix.helpers.models.NormalizedDecimalField(decimal_places=4, max_digits=7),
+        ),
+
+    ]

src/pretix/base/models/invoices.py

@@ -49,6 +49,7 @@ from django_scopes import ScopedManager
 
 from pretix.base.settings import COUNTRIES_WITH_STATE_IN_ADDRESS
 from pretix.helpers.countries import FastCountryField
+from pretix.helpers.models import NormalizedDecimalField
 
 
 def invoice_filename(instance, filename: str) -> str:
@@ -450,7 +451,7 @@ class InvoiceLine(models.Model):
     description = models.TextField()
     gross_value = models.DecimalField(max_digits=13, decimal_places=2)
     tax_value = models.DecimalField(max_digits=13, decimal_places=2, default=Decimal('0.00'))
-    tax_rate = models.DecimalField(max_digits=7, decimal_places=2, default=Decimal('0.00'))
+    tax_rate = NormalizedDecimalField(max_digits=7, decimal_places=4, default=Decimal('0'))
     tax_name = models.CharField(max_length=190)
     tax_code = models.CharField(max_length=190, null=True, blank=True)
     subevent = models.ForeignKey('SubEvent', null=True, blank=True, on_delete=models.PROTECT)

src/pretix/base/models/orders.py

@@ -87,6 +87,7 @@ from pretix.base.timemachine import time_machine_now
 
 from ...helpers import OF_SELF
 from ...helpers.countries import CachedCountries, FastCountryField
+from ...helpers.models import NormalizedDecimalField
 from ...helpers.names import build_name
 from ...testutils.middleware import debugflags_var
 from ._transactions import (
@@ -2334,8 +2335,8 @@ class OrderFee(RoundingCorrectionMixin, models.Model):
     )
     description = models.CharField(max_length=190, blank=True)
     internal_type = models.CharField(max_length=255, blank=True)
-    tax_rate = models.DecimalField(
+    tax_rate = NormalizedDecimalField(
-        max_digits=7, decimal_places=2,
+        max_digits=7, decimal_places=4,
         verbose_name=_('Tax rate')
     )
     tax_rule = models.ForeignKey(
@@ -2533,8 +2534,8 @@ class OrderPosition(AbstractPosition):
         max_digits=13, decimal_places=2, null=True, blank=True,
     )
 
-    tax_rate = models.DecimalField(
+    tax_rate = NormalizedDecimalField(
-        max_digits=7, decimal_places=2,
+        max_digits=7, decimal_places=4,
         verbose_name=_('Tax rate')
     )
     tax_rule = models.ForeignKey(
@@ -3052,8 +3053,8 @@ class Transaction(models.Model):
     price_includes_rounding_correction = models.DecimalField(
         max_digits=13, decimal_places=2, default=Decimal("0.00")
     )
-    tax_rate = models.DecimalField(
+    tax_rate = NormalizedDecimalField(
-        max_digits=7, decimal_places=2,
+        max_digits=7, decimal_places=4,
         verbose_name=_('Tax rate')
     )
     tax_rule = models.ForeignKey(
@@ -3168,8 +3169,8 @@ class CartPosition(AbstractPosition):
         verbose_name=_("Limit for extending expiration date"),
         null=True
     )
-    tax_rate = models.DecimalField(
+    tax_rate = NormalizedDecimalField(
-        max_digits=7, decimal_places=2, default=Decimal('0.00'),
+        max_digits=7, decimal_places=4, default=Decimal('0'),
         verbose_name=_('Tax rate')
     )
     tax_code = models.CharField(

src/pretix/base/models/tax.py

@@ -40,6 +40,7 @@ from pretix.base.decimal import round_decimal
 from pretix.base.models.base import LoggedModel
 from pretix.base.templatetags.money import money_filter
 from pretix.helpers.countries import FastCountryField
+from pretix.helpers.models import NormalizedDecimalField
 
 
 class TaxedPrice:
@@ -335,9 +336,9 @@ class TaxRule(LoggedModel):
         max_length=190,
         choices=TAX_CODE_LISTS,
     )
-    rate = models.DecimalField(
+    rate = NormalizedDecimalField(
-        max_digits=10,
+        max_digits=7,
-        decimal_places=2,
+        decimal_places=4,
         validators=[
             MaxValueValidator(
                 limit_value=Decimal("100.00"),

src/pretix/base/templatetags/money.py

@@ -26,6 +26,8 @@ from babel.numbers import format_currency
 from django import template
 from django.conf import settings
 from django.template.defaultfilters import floatformat
+from django.utils import formats
+from django.utils.safestring import mark_safe
 
 from pretix.base.i18n import get_babel_locale
 
@@ -82,3 +84,19 @@ def money_numberfield_filter(value: Decimal, arg=''):
 
     places = settings.CURRENCY_PLACES.get(arg, 2)
     return str(value.quantize(Decimal('1') / 10 ** places, ROUND_HALF_UP))
+
+
+@register.filter(is_safe=True)
+def tax_rate_format(number):
+    """
+    Display a Decimal to its significant decimal places, used for tax rates.
+    """
+    assert isinstance(number, Decimal)
+    return mark_safe(
+        formats.number_format(
+            number.normalize(),
+            -number.as_tuple().exponent,
+            use_l10n=True,
+            force_grouping=False,
+        )
+    )

src/pretix/control/templates/pretixcontrol/items/index.html

@@ -156,11 +156,11 @@
                                     <br/>
                                     <small class="text-muted">
                                         {% if not i.tax_rule.price_includes_tax %}
-                                            {% blocktrans trimmed with rate=i.tax_rule.rate|floatformat:-2 taxname=i.tax_rule.name %}
+                                            {% blocktrans trimmed with rate=i.tax_rule.rate|tax_rate_format taxname=i.tax_rule.name %}
                                                 <strong>plus</strong> {{ rate }}% {{ taxname }}
                                             {% endblocktrans %}
                                         {% else %}
-                                            {% blocktrans trimmed with rate=i.tax_rule.rate|floatformat:-2 taxname=i.tax_rule.name|default:s_taxes %}
+                                            {% blocktrans trimmed with rate=i.tax_rule.rate|tax_rate_format taxname=i.tax_rule.name|default:s_taxes %}
                                                 incl. {{ rate }}% {{ taxname }}
                                             {% endblocktrans %}
                                         {% endif %}

src/pretix/control/templates/pretixcontrol/order/index.html

@@ -670,7 +670,7 @@
                                     {% if line.tax_rate %}
                                         <br/>
                                         <small>
-                                            {% blocktrans trimmed with rate=line.tax_rate|floatformat:-2 taxname=line.tax_rule.name|default:s_taxes %}
+                                            {% blocktrans trimmed with rate=line.tax_rate|tax_rate_format taxname=line.tax_rule.name|default:s_taxes %}
                                                 <strong>plus</strong> {{ rate }}% {{ taxname }}
                                             {% endblocktrans %}
                                         </small>
@@ -680,7 +680,7 @@
                                     {% if line.tax_rate and line.price %}
                                         <br/>
                                         <small>
-                                            {% blocktrans trimmed with rate=line.tax_rate|floatformat:-2 taxname=line.tax_rule.name|default:s_taxes %}
+                                            {% blocktrans trimmed with rate=line.tax_rate|tax_rate_format taxname=line.tax_rule.name|default:s_taxes %}
                                                 incl. {{ rate }}% {{ taxname }}
                                             {% endblocktrans %}
                                         </small>
@@ -720,7 +720,7 @@
                                     {% if fee.tax_rate %}
                                         <br/>
                                         <small>
-                                            {% blocktrans trimmed with rate=fee.tax_rate|floatformat:-2 taxname=fee.tax_rule.name|default:s_taxes %}
+                                            {% blocktrans trimmed with rate=fee.tax_rate|tax_rate_format taxname=fee.tax_rule.name|default:s_taxes %}
                                                 <strong>plus</strong> {{ rate }}% {{ taxname }}
                                             {% endblocktrans %}
                                         </small>
@@ -730,7 +730,7 @@
                                     {% if fee.tax_rate %}
                                         <br/>
                                         <small>
-                                            {% blocktrans trimmed with rate=fee.tax_rate|floatformat:-2 taxname=fee.tax_rule.name|default:s_taxes %}
+                                            {% blocktrans trimmed with rate=fee.tax_rate|tax_rate_format taxname=fee.tax_rule.name|default:s_taxes %}
                                                 incl. {{ rate }}% {{ taxname }}
                                             {% endblocktrans %}
                                         </small>

src/pretix/helpers/models.py

@@ -23,6 +23,7 @@ import copy
 
 from django.core.files import File
 from django.db import models
+from django.db.models.fields import DecimalField
 
 
 class Thumbnail(models.Model):
@@ -54,3 +55,15 @@ def flatten_choices(choices):
             yield from label_or_nested
         else:
             yield value_or_group, label_or_nested
+
+
+class NormalizedDecimalField(DecimalField):
+    """
+    Variant of DecimalField that never outputs the trailing zeros, so we always have normalized decimals internally.
+    Use this only for fields where the trailing zeros are pointless (e.g. percentages), not for monetary amounts.
+    """
+
+    def from_db_value(self, value, expression, connection):
+        if value is not None:
+            value = value.normalize()
+        return value

src/pretix/presale/templates/pretixpresale/event/fragment_addon_choice.html

@@ -173,11 +173,11 @@
                                                 <small>{% trans "incl. taxes" %}</small>
                                             {% endif %}
                                         {% elif var.display_price.rate and var.display_price.gross and event.settings.display_net_prices %}
-                                            <small>{% blocktrans trimmed with rate=var.display_price.rate|floatformat:-2 name=var.display_price.name %}
+                                            <small>{% blocktrans trimmed with rate=var.display_price.rate|tax_rate_format name=var.display_price.name %}
                                                 <strong>plus</strong> {{ rate }}% {{ name }}
                                             {% endblocktrans %}</small>
                                         {% elif var.display_price.rate and var.display_price.gross %}
-                                            <small>{% blocktrans trimmed with rate=var.display_price.rate|floatformat:-2 name=var.display_price.name %}
+                                            <small>{% blocktrans trimmed with rate=var.display_price.rate|tax_rate_format name=var.display_price.name %}
                                                 incl. {{ rate }}% {{ name }}
                                             {% endblocktrans %}</small>
                                         {% endif %}
@@ -313,11 +313,11 @@
                                         <small>{% trans "incl. taxes" %}</small>
                                     {% endif %}
                                 {% elif item.display_price.rate and item.display_price.gross and event.settings.display_net_prices %}
-                                    <small>{% blocktrans trimmed with rate=item.display_price.rate|floatformat:-2 name=item.display_price.name %}
+                                    <small>{% blocktrans trimmed with rate=item.display_price.rate|tax_rate_format name=item.display_price.name %}
                                         <strong>plus</strong> {{ rate }}% {{ name }}
                                     {% endblocktrans %}</small>
                                 {% elif item.display_price.rate and item.display_price.gross %}
-                                    <small>{% blocktrans trimmed with rate=item.display_price.rate|floatformat:-2 name=item.display_price.name %}
+                                    <small>{% blocktrans trimmed with rate=item.display_price.rate|tax_rate_format name=item.display_price.name %}
                                         incl. {{ rate }}% {{ name }}
                                     {% endblocktrans %}</small>
                                 {% endif %}

src/pretix/presale/templates/pretixpresale/event/fragment_cart.html

@@ -357,7 +357,7 @@
                         {% if line.tax_rate and line.total %}
                             <br />
                             <small>
-                                {% blocktrans trimmed with rate=line.tax_rate|floatformat:-2 taxname=line.tax_rule.name|default:s_taxes %}
+                                {% blocktrans trimmed with rate=line.tax_rate|tax_rate_format taxname=line.tax_rule.name|default:s_taxes %}
                                     <strong>plus</strong> {{ rate }}% {{ taxname }}
                                 {% endblocktrans %}
                             </small>
@@ -367,7 +367,7 @@
                         {% if line.tax_rate and line.total %}
                             <br />
                             <small>
-                                {% blocktrans trimmed with rate=line.tax_rate|floatformat:-2 taxname=line.tax_rule.name|default:s_taxes %}
+                                {% blocktrans trimmed with rate=line.tax_rate|tax_rate_format taxname=line.tax_rule.name|default:s_taxes %}
                                     incl. {{ rate }}% {{ taxname }}
                                 {% endblocktrans %}
                             </small>
@@ -416,7 +416,7 @@
                         {% if fee.tax_rate %}
                             <br />
                             <small>
-                                {% blocktrans trimmed with rate=fee.tax_rate|floatformat:-2 taxname=fee.tax_rule.name|default:s_taxes %}
+                                {% blocktrans trimmed with rate=fee.tax_rate|tax_rate_format taxname=fee.tax_rule.name|default:s_taxes %}
                                     <strong>plus</strong> {{ rate }}% {{ taxname }}
                                 {% endblocktrans %}
                             </small>
@@ -426,7 +426,7 @@
                         {% if fee.tax_rate %}
                             <br />
                             <small>
-                                {% blocktrans trimmed with rate=fee.tax_rate|floatformat:-2 taxname=fee.tax_rule.name|default:s_taxes %}
+                                {% blocktrans trimmed with rate=fee.tax_rate|tax_rate_format taxname=fee.tax_rule.name|default:s_taxes %}
                                     incl. {{ rate }}% {{ taxname }}
                                 {% endblocktrans %}
                             </small>

src/pretix/presale/templates/pretixpresale/event/fragment_product_list.html

@@ -207,13 +207,13 @@
                                         {% endif %}
                                     {% elif var.display_price.rate and var.display_price.gross and event.settings.display_net_prices %}
                                         <small data-toggle="tooltip" title="{% blocktrans trimmed with value=var.display_price.gross|money:event.currency %}{{ value }} incl. taxes{% endblocktrans %}" data-placement="bottom">
-                                            {% blocktrans trimmed with rate=var.display_price.rate|floatformat:-2 name=var.display_price.name %}
+                                            {% blocktrans trimmed with rate=var.display_price.rate|tax_rate_format name=var.display_price.name %}
                                                 <strong>plus</strong> {{ rate }}% {{ name }}
                                             {% endblocktrans %}
                                         </small>
                                     {% elif var.display_price.rate and var.display_price.gross %}
                                         <small data-toggle="tooltip" title="{% blocktrans trimmed with value=var.display_price.net|money:event.currency %}{{ value }} without taxes{% endblocktrans %}" data-placement="bottom">
-                                            {% blocktrans trimmed with rate=var.display_price.rate|floatformat:-2 name=var.display_price.name %}
+                                            {% blocktrans trimmed with rate=var.display_price.rate|tax_rate_format name=var.display_price.name %}
                                                 incl. {{ rate }}% {{ name }}
                                             {% endblocktrans %}
                                         </small>
@@ -372,13 +372,13 @@
                             {% endif %}
                         {% elif item.display_price.rate and item.display_price.gross and event.settings.display_net_prices %}
                             <small data-toggle="tooltip" title="{% blocktrans trimmed with value=item.display_price.gross|money:event.currency %}{{ value }} incl. taxes{% endblocktrans %}" data-placement="bottom">
-                                {% blocktrans trimmed with rate=item.display_price.rate|floatformat:-2 name=item.display_price.name %}
+                                {% blocktrans trimmed with rate=item.display_price.rate|tax_rate_format name=item.display_price.name %}
                                     <strong>plus</strong> {{ rate }}% {{ name }}
                                 {% endblocktrans %}
                             </small>
                         {% elif item.display_price.rate and item.display_price.gross %}
                             <small data-toggle="tooltip" title="{% blocktrans trimmed with value=item.display_price.net|money:event.currency %}{{ value }} without taxes{% endblocktrans %}" data-placement="bottom">
-                                {% blocktrans trimmed with rate=item.display_price.rate|floatformat:-2 name=item.display_price.name %}
+                                {% blocktrans trimmed with rate=item.display_price.rate|tax_rate_format name=item.display_price.name %}
                                     incl. {{ rate }}% {{ name }}
                                 {% endblocktrans %}
                             </small>

src/pretix/presale/templates/pretixpresale/event/voucher.html

@@ -201,13 +201,13 @@
                                                 {% endif %}
                                                 {% elif var.display_price.rate and var.display_price.gross and event.settings.display_net_prices %}
                                                     <small data-toggle="tooltip" title="{% blocktrans trimmed with value=var.display_price.gross|money:event.currency %}{{ value }} incl. taxes{% endblocktrans %}" data-placement="bottom">
-                                                        {% blocktrans trimmed with rate=var.display_price.rate|floatformat:-2 name=var.display_price.name %}
+                                                        {% blocktrans trimmed with rate=var.display_price.rate|tax_rate_format name=var.display_price.name %}
                                                             <strong>plus</strong> {{ rate }}% {{ name }}
                                                         {% endblocktrans %}
                                                     </small>
                                                 {% elif var.display_price.rate and var.display_price.gross %}
                                                     <small data-toggle="tooltip" title="{% blocktrans trimmed with value=var.display_price.net|money:event.currency %}{{ value }} without taxes{% endblocktrans %}" data-placement="bottom">
-                                                        {% blocktrans trimmed with rate=var.display_price.rate|floatformat:-2 name=var.display_price.name %}
+                                                        {% blocktrans trimmed with rate=var.display_price.rate|tax_rate_format name=var.display_price.name %}
                                                             incl. {{ rate }}% {{ name }}
                                                         {% endblocktrans %}
                                                     </small>
@@ -356,13 +356,13 @@
                                         {% endif %}
                                     {% elif item.display_price.rate and item.display_price.gross and event.settings.display_net_prices %}
                                         <small data-toggle="tooltip" title="{% blocktrans trimmed with value=item.display_price.gross|money:event.currency %}{{ value }} incl. taxes{% endblocktrans %}" data-placement="bottom">
-                                            {% blocktrans trimmed with rate=item.display_price.rate|floatformat:-2 name=item.display_price.name %}
+                                            {% blocktrans trimmed with rate=item.display_price.rate|tax_rate_format name=item.display_price.name %}
                                                 <strong>plus</strong> {{ rate }}% {{ name }}
                                             {% endblocktrans %}
                                         </small>
                                     {% elif item.display_price.rate and item.display_price.gross %}
                                         <small data-toggle="tooltip" title="{% blocktrans trimmed with value=item.display_price.net|money:event.currency %}{{ value }} without taxes{% endblocktrans %}" data-placement="bottom">
-                                            {% blocktrans trimmed with rate=item.display_price.rate|floatformat:-2 name=item.display_price.name %}
+                                            {% blocktrans trimmed with rate=item.display_price.rate|tax_rate_format name=item.display_price.name %}
                                                 incl. {{ rate }}% {{ name }}
                                             {% endblocktrans %}
                                         </small>

src/pretix/static/jsi18n/en/djangojs.js

@@ -1,5 +1,4 @@
 
-
 'use strict';
 {
   const globals = this;

src/tests/presale/test_widget.py

@@ -189,8 +189,8 @@ class WidgetCartTest(CartTestMixin, TestCase):
                             "current_unavailability_reason": None,
                             "order_min": None,
                             "max_price": None,
-                            "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00", "includes_mixed_tax_rate": False},
+                            "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19", "includes_mixed_tax_rate": False},
-                            "suggested_price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00", "includes_mixed_tax_rate": False},
+                            "suggested_price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19", "includes_mixed_tax_rate": False},
                             "picture": None,
                             "picture_fullsize": None,
                             "has_variations": 0,
@@ -226,9 +226,9 @@ class WidgetCartTest(CartTestMixin, TestCase):
                                     "id": self.shirt_red.pk,
                                     'original_price': None,
                                     "price": {"gross": "14.00", "net": "11.76", "tax": "2.24", "name": "",
-                                              "rate": "19.00", "includes_mixed_tax_rate": False},
+                                              "rate": "19", "includes_mixed_tax_rate": False},
                                     "suggested_price": {"gross": "14.00", "net": "11.76", "tax": "2.24", "name": "",
-                                                        "rate": "19.00", "includes_mixed_tax_rate": False},
+                                                        "rate": "19", "includes_mixed_tax_rate": False},
                                     "description": None,
                                     "avail": [100, None],
                                     "order_max": 2,
@@ -239,9 +239,9 @@ class WidgetCartTest(CartTestMixin, TestCase):
                                     "id": self.shirt_blue.pk,
                                     'original_price': None,
                                     "price": {"gross": "12.00", "net": "10.08", "tax": "1.92", "name": "",
-                                              "rate": "19.00", "includes_mixed_tax_rate": False},
+                                              "rate": "19", "includes_mixed_tax_rate": False},
                                     "suggested_price": {"gross": "12.00", "net": "10.08", "tax": "1.92", "name": "",
-                                                        "rate": "19.00", "includes_mixed_tax_rate": False},
+                                                        "rate": "19", "includes_mixed_tax_rate": False},
                                     "description": None,
                                     "avail": [100, None],
                                     "order_max": 2,
@@ -278,9 +278,9 @@ class WidgetCartTest(CartTestMixin, TestCase):
                         "current_unavailability_reason": None,
                         "order_min": None,
                         "max_price": None,
-                        "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00",
+                        "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19",
                                   "includes_mixed_tax_rate": False},
-                        "suggested_price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00",
+                        "suggested_price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19",
                                             "includes_mixed_tax_rate": False},
                         "picture": None,
                         "picture_fullsize": None,
@@ -343,9 +343,9 @@ class WidgetCartTest(CartTestMixin, TestCase):
                                 "id": self.shirt_red.pk,
                                 'original_price': None,
                                 "price": {"gross": "14.00", "net": "11.76", "tax": "2.24", "name": "",
-                                          "rate": "19.00", "includes_mixed_tax_rate": False},
+                                          "rate": "19", "includes_mixed_tax_rate": False},
                                 "suggested_price": {"gross": "14.00", "net": "11.76", "tax": "2.24", "name": "",
-                                                    "rate": "19.00", "includes_mixed_tax_rate": False},
+                                                    "rate": "19", "includes_mixed_tax_rate": False},
                                 "description": None,
                                 "avail": [100, None],
                                 "order_max": 2,
@@ -395,8 +395,8 @@ class WidgetCartTest(CartTestMixin, TestCase):
                             "current_unavailability_reason": None,
                             "order_min": None,
                             "max_price": None,
-                            "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00", "includes_mixed_tax_rate": False},
+                            "price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19", "includes_mixed_tax_rate": False},
-                            "suggested_price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19.00", "includes_mixed_tax_rate": False},
+                            "suggested_price": {"gross": "23.00", "net": "19.33", "tax": "3.67", "name": "", "rate": "19", "includes_mixed_tax_rate": False},
                             "picture": None,
                             "picture_fullsize": None,
                             "has_variations": 0,
@@ -481,7 +481,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                                         'gross': '14.00',
                                         'net': '11.76',
                                         'tax': '2.24',
-                                        'rate': '19.00',
+                                        'rate': '19',
                                         'name': '',
                                         'includes_mixed_tax_rate': False
                                     },
@@ -489,7 +489,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
                                         'gross': '14.00',
                                         'net': '11.76',
                                         'tax': '2.24',
-                                        'rate': '19.00',
+                                        'rate': '19',
                                         'name': '',
                                         'includes_mixed_tax_rate': False
                                     },
@@ -601,7 +601,7 @@ class WidgetCartTest(CartTestMixin, TestCase):
             "net": "19.52",
             "tax": "3.48",
             "name": "MIXED!",
-            "rate": "19.00",
+            "rate": "19",
             "includes_mixed_tax_rate": True
         }