diff --git a/addons/point_of_sale/point_of_sale.py b/addons/point_of_sale/point_of_sale.py
index 970eb1fbed7..8e47d83aa24 100644
--- a/addons/point_of_sale/point_of_sale.py
+++ b/addons/point_of_sale/point_of_sale.py
@@ -853,8 +853,7 @@ class pos_order(osv.osv):
                 inv_line['price_unit'] = line.price_unit
                 inv_line['discount'] = line.discount
                 inv_line['name'] = inv_name
-                inv_line['invoice_line_tax_id'] = ('invoice_line_tax_id' in inv_line)\
-                    and [(6, 0, inv_line['invoice_line_tax_id'])] or []
+                inv_line['invoice_line_tax_id'] = [(6, 0, [x.id for x in line.product_id.taxes_id] )]
                 inv_line_ref.create(cr, uid, inv_line, context=context)
             inv_ref.button_reset_taxes(cr, uid, [inv_id], context=context)
             wf_service.trg_validate(uid, 'pos.order', order.id, 'invoice', cr)
@@ -1156,7 +1155,6 @@ class pos_order_line(osv.osv):
 
         prod = self.pool.get('product.product').browse(cr, uid, product, context=context)
 
-        taxes = prod.taxes_id
         price = price_unit * (1 - (discount or 0.0) / 100.0)
         taxes = account_tax_obj.compute_all(cr, uid, prod.taxes_id, price, qty, product=prod, partner=False)