diff --git a/addons/hr_payroll/hr_payroll_data.xml b/addons/hr_payroll/hr_payroll_data.xml
index cb6af5d0ab8..df21b9ea61a 100644
--- a/addons/hr_payroll/hr_payroll_data.xml
+++ b/addons/hr_payroll/hr_payroll_data.xml
@@ -182,7 +182,7 @@
             <field name="category_id" ref="hr_payroll.NET"/>
             <field name="condition_select">none</field>
             <field name="amount_select">code</field>
-            <field name="amount_python_compute">result = heads['BASIC'] + ('ALW' in heads and heads['ALW'] or 0.0) - ('DED' in heads and heads['DED'] or 0.0)</field>
+            <field name="amount_python_compute">result = heads['BASIC'] + ('ALW' in heads and heads['ALW'] or 0.0) + ('DED' in heads and heads['DED'] or 0.0)</field>
         </record>