diff --git a/src/pretix/base/invoice.py b/src/pretix/base/invoice.py
index 004287c90b..09f5643d1c 100644
--- a/src/pretix/base/invoice.py
+++ b/src/pretix/base/invoice.py
@@ -387,7 +387,7 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
                   pgettext('invoice', 'Net value'), pgettext('invoice', 'Gross value'), pgettext('invoice', 'Tax'))]
 
         for rate, gross in grossvalue_map.items():
-            if line.tax_rate == 0:
+            if rate == 0:
                 continue
             tax = taxvalue_map[rate]
             tdata.append((