diff --git a/addons/website_sale/controllers/main.py b/addons/website_sale/controllers/main.py
index dc127243818..c46c2928a06 100644
--- a/addons/website_sale/controllers/main.py
+++ b/addons/website_sale/controllers/main.py
@@ -1732,9 +1732,6 @@ class PaymentPortal(payment_portal.PaymentPortal):
         if order_sudo.state == "cancel":
             raise ValidationError(_("The order has been canceled."))
 
-        if tools.float_compare(kwargs['amount'], order_sudo.amount_total, precision_rounding=order_sudo.currency_id.rounding):
-            raise ValidationError(_("The cart has been updated. Please refresh the page."))
-
         kwargs.update({
             'reference_prefix': None,  # Allow the reference to be computed based on the order
             'sale_order_id': order_id,  # Include the SO to allow Subscriptions to tokenize the tx
@@ -1742,6 +1739,10 @@ class PaymentPortal(payment_portal.PaymentPortal):
         kwargs.pop('custom_create_values', None)  # Don't allow passing arbitrary create values
         if not kwargs.get('amount'):
             kwargs['amount'] = order_sudo.amount_total
+
+        if tools.float_compare(kwargs['amount'], order_sudo.amount_total, precision_rounding=order_sudo.currency_id.rounding):
+            raise ValidationError(_("The cart has been updated. Please refresh the page."))
+
         tx_sudo = self._create_transaction(
             custom_create_values={'sale_order_ids': [Command.set([order_id])]}, **kwargs,
         )