diff --git a/addons/point_of_sale/models/pos_order.py b/addons/point_of_sale/models/pos_order.py
index 094db43c3dc..a8b466f1acb 100644
--- a/addons/point_of_sale/models/pos_order.py
+++ b/addons/point_of_sale/models/pos_order.py
@@ -223,7 +223,7 @@ class PosOrder(models.Model):
                 })
 
                 if data_type == 'product':
-                    key = ('product', values['partner_id'], (values['product_id'], values['name']), values['analytic_account_id'], values['debit'] > 0)
+                    key = ('product', values['partner_id'], (values['product_id'], tuple(values['tax_ids'][0][2]), values['name']), values['analytic_account_id'], values['debit'] > 0)
                 elif data_type == 'tax':
                     key = ('tax', values['partner_id'], values['tax_line_id'], values['debit'] > 0)
                 elif data_type == 'counter_part':
@@ -287,7 +287,7 @@ class PosOrder(models.Model):
                     'analytic_account_id': self._prepare_analytic_account(line),
                     'credit': ((amount > 0) and amount) or 0.0,
                     'debit': ((amount < 0) and -amount) or 0.0,
-                    'tax_ids': [(6, 0, line.tax_ids.ids)],
+                    'tax_ids': [(6, 0, line.tax_ids_after_fiscal_position.ids)],
                     'partner_id': partner_id
                 })