diff --git a/src/pretix/base/services/cart.py b/src/pretix/base/services/cart.py
index d282c4d9f..60e85d196 100644
--- a/src/pretix/base/services/cart.py
+++ b/src/pretix/base/services/cart.py
@@ -1,5 +1,5 @@
 from collections import Counter, defaultdict, namedtuple
-from datetime import timedelta
+from datetime import datetime, time, timedelta
 from decimal import Decimal
 from typing import List, Optional
 
@@ -8,7 +8,7 @@ from django.core.exceptions import ValidationError
 from django.db import transaction
 from django.db.models import Q
 from django.dispatch import receiver
-from django.utils.timezone import now
+from django.utils.timezone import make_aware, now
 from django.utils.translation import pgettext_lazy, ugettext as _
 
 from pretix.base.i18n import language
@@ -19,6 +19,7 @@ from pretix.base.models import (
 from pretix.base.models.event import SubEvent
 from pretix.base.models.orders import OrderFee
 from pretix.base.models.tax import TAXED_ZERO, TaxedPrice, TaxRule
+from pretix.base.reldate import RelativeDateWrapper
 from pretix.base.services.checkin import _save_answers
 from pretix.base.services.locking import LockTimeoutException
 from pretix.base.services.pricing import get_price
@@ -134,6 +135,15 @@ class CartManager:
             raise CartError(error_messages['not_started'])
         if self.event.presale_has_ended:
             raise CartError(error_messages['ended'])
+        if not self.event.has_subevents:
+            tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+            if tlv:
+                term_last = make_aware(datetime.combine(
+                    tlv.datetime(self.event).date(),
+                    time(hour=23, minute=59, second=59)
+                ), self.event.timezone)
+                if term_last < self.now_dt:
+                    raise CartError(error_messages['ended'])
 
     def _extend_expiry_of_valid_existing_positions(self):
         # Extend this user's cart session to ensure all items in the cart expire at the same time
@@ -152,6 +162,18 @@ class CartManager:
                 err = error_messages['some_subevent_ended']
                 cp.addons.all().delete()
                 cp.delete()
+
+            if cp.subevent:
+                tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+                if tlv:
+                    term_last = make_aware(datetime.combine(
+                        tlv.datetime(cp.subevent).date(),
+                        time(hour=23, minute=59, second=59)
+                    ), self.event.timezone)
+                    if term_last < self.now_dt:
+                        err = error_messages['some_subevent_ended']
+                        cp.addons.all().delete()
+                        cp.delete()
         return err
 
     def _update_subevents_cache(self, se_ids: List[int]):
@@ -216,6 +238,16 @@ class CartManager:
             if op.subevent and op.subevent.presale_has_ended:
                 raise CartError(error_messages['ended'])
 
+            if op.subevent:
+                tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper)
+                if tlv:
+                    term_last = make_aware(datetime.combine(
+                        tlv.datetime(op.subevent).date(),
+                        time(hour=23, minute=59, second=59)
+                    ), self.event.timezone)
+                    if term_last < self.now_dt:
+                        raise CartError(error_messages['ended'])
+
         if isinstance(op, self.AddOperation):
             if op.item.category and op.item.category.is_addon and not (op.addon_to and op.addon_to != 'FAKE'):
                 raise CartError(error_messages['addon_only'])
diff --git a/src/tests/presale/test_cart.py b/src/tests/presale/test_cart.py
index 0eeda0f24..f3e2378b4 100644
--- a/src/tests/presale/test_cart.py
+++ b/src/tests/presale/test_cart.py
@@ -71,6 +71,16 @@ class CartTest(CartTestMixin, TestCase):
         assert 'alert-danger' in response.rendered_content
         assert not CartPosition.objects.filter(cart_id=self.session_key, event=self.event).exists()
 
+    def test_after_payment_period(self):
+        self.event.settings.payment_term_last = (now() - datetime.timedelta(days=1)).date().isoformat()
+        response = self.client.post('/%s/%s/cart/add' % (self.orga.slug, self.event.slug), {
+            'item_%d' % self.ticket.id: '1'
+        }, follow=True)
+        self.assertRedirects(response, '/%s/%s/?require_cookie=true' % (self.orga.slug, self.event.slug),
+                             target_status_code=200)
+        assert 'alert-danger' in response.rendered_content
+        assert not CartPosition.objects.filter(cart_id=self.session_key, event=self.event).exists()
+
     def test_after_event(self):
         self.event.date_to = now() - timedelta(days=1)
         self.event.save()
@@ -321,6 +331,20 @@ class CartTest(CartTestMixin, TestCase):
         objs = list(CartPosition.objects.filter(cart_id=self.session_key, event=self.event))
         self.assertEqual(len(objs), 1)
 
+    def test_subevent_payment_period_over(self):
+        self.event.has_subevents = True
+        self.event.save()
+        self.event.settings.payment_term_last = 'RELDATE/1/23:59:59/date_from/'
+        se = self.event.subevents.create(name='Foo', date_from=now(), active=True)
+        q = se.quotas.create(name="foo", size=None, event=self.event)
+        q.items.add(self.ticket)
+        self.client.post('/%s/%s/cart/add' % (self.orga.slug, self.event.slug), {
+            'item_%d' % self.ticket.id: '1',
+            'subevent': se.pk
+        }, follow=False)
+        objs = list(CartPosition.objects.filter(cart_id=self.session_key, event=self.event))
+        self.assertEqual(len(objs), 0)
+
     def test_subevent_sale_over(self):
         self.event.has_subevents = True
         self.event.save()