diff --git a/contract.py b/contract.py
index a586658..c09b6ff 100644
--- a/contract.py
+++ b/contract.py
@@ -577,6 +577,8 @@ class SaleContractLine(Workflow, ModelSQL, ModelView):
                 value['products_aiu'] = [('create', products_aiu)]
             lines_to_create.append(value)
         InvoiceLine.create(lines_to_create)
+        invoice.on_change_taxes()
+        invoice.save()
         self.write([self], {'origin': str(invoice)})
         return invoice