diff --git a/addons/point_of_sale/point_of_sale.py b/addons/point_of_sale/point_of_sale.py
index fdb64a665bd..023b031cc90 100644
--- a/addons/point_of_sale/point_of_sale.py
+++ b/addons/point_of_sale/point_of_sale.py
@@ -1258,7 +1258,7 @@ class pos_order(osv.osv):
                     'credit': ((tax_amount>0) and tax_amount) or 0.0,
                     'debit': ((tax_amount<0) and -tax_amount) or 0.0,
                     'tax_code_id': key[tax_code_pos],
-                    'tax_amount': abs(tax_amount),
+                    'tax_amount': tax_amount,
                     'partner_id': order.partner_id and self.pool.get("res.partner")._find_accounting_partner(order.partner_id).id or False
                 })