From efb94265b272513026644c542d6538e2ca541ee7 Mon Sep 17 00:00:00 2001
From: Raphael Michel <michel@pretix.eu>
Date: Fri, 16 Jan 2026 15:13:45 +0100
Subject: [PATCH] Cart: Use price before rounding as custom price for plus
 button (#5780)

---
 .../templates/pretixpresale/event/fragment_cart.html        | 4 ++--
 src/pretix/presale/views/__init__.py                        | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html b/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
index 361dcca763..8b09753c27 100644
--- a/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
+++ b/src/pretix/presale/templates/pretixpresale/event/fragment_cart.html
@@ -313,12 +313,12 @@
                             <input type="hidden" name="variation_{{ line.item.id }}_{{ line.variation.id }}"
                                 value="1" />
                             <input type="hidden" name="price_{{ line.item.id }}_{{ line.variation.id }}"
-                                    value="{% if event.settings.display_net_prices %}{{ line.bundle_sum_net }}{% else %}{{ line.bundle_sum }}{% endif %}" />
+                                    value="{% if event.settings.display_net_prices %}{{ line.price_for_input_net }}{% else %}{{ line.price_for_input }}{% endif %}" />
                         {% else %}
                             <input type="hidden" name="item_{{ line.item.id }}"
                                     value="1" />
                             <input type="hidden" name="price_{{ line.item.id }}"
-                                    value="{% if event.settings.display_net_prices %}{{ line.bundle_sum_net }}{% else %}{{ line.bundle_sum }}{% endif %}" />
+                                   value="{% if event.settings.display_net_prices %}{{ line.price_for_input_net }}{% else %}{{ line.price_for_input }}{% endif %}" />
                         {% endif %}
                         <button class="btn btn-mini btn-link {% if line.seat %}btn-invisible{% endif %}" title="{% blocktrans with item=line.item.name %}Add one more {{item}} to your cart{% endblocktrans %}" {% if line.seat %}disabled{% endif %}>
                             <i class="fa fa-plus" aria-hidden="true"></i>
diff --git a/src/pretix/presale/views/__init__.py b/src/pretix/presale/views/__init__.py
index 77a7d2dfb3..3f902614f3 100644
--- a/src/pretix/presale/views/__init__.py
+++ b/src/pretix/presale/views/__init__.py
@@ -209,6 +209,8 @@ class CartMixin:
                     pos.valid_from,
                     pos.valid_until,
                     pos.used_membership_id,
+                    pos.gross_price_before_rounding,
+                    pos.tax_value_before_rounding,
                 )
 
         positions = []
@@ -222,8 +224,8 @@ class CartMixin:
             if not hasattr(group, 'tax_rule'):
                 group.tax_rule = group.item.tax_rule
 
-            group.bundle_sum = group.price + sum(a.price for a in has_addons[group.pk])
-            group.bundle_sum_net = group.net_price + sum(a.net_price for a in has_addons[group.pk])
+            group.price_for_input = group.gross_price_before_rounding + sum(a.gross_price_before_rounding for a in has_addons[group.pk])
+            group.price_for_input_net = group.net_price_before_rounding + sum(a.net_price_before_rounding for a in has_addons[group.pk])
 
             if answers:
                 group.cache_answers(all=False)