diff --git a/addons/l10n_be_hr_payroll/models/l10n_be_hr_payroll.py b/addons/l10n_be_hr_payroll/models/l10n_be_hr_payroll.py
index 47e3deb315d..43018d50a90 100644
--- a/addons/l10n_be_hr_payroll/models/l10n_be_hr_payroll.py
+++ b/addons/l10n_be_hr_payroll/models/l10n_be_hr_payroll.py
@@ -67,7 +67,7 @@ class HrContract(models.Model):
         help="Number of days of paid leaves the employee gets per year.")
     holidays_editable = fields.Boolean(string="Editable Holidays", default=True)
     holidays_compensation = fields.Monetary(compute='_compute_holidays_compensation', string="Holidays Compensation")
-    wage_with_holidays = fields.Monetary(compute='_compute_wage_with_holidays', string="Wage update with holidays retenues")
+    wage_with_holidays = fields.Monetary(compute='_compute_wage_with_holidays', inverse='_inverse_wage_with_holidays', string="Wage update with holidays retenues")
     additional_net_amount = fields.Monetary(string="Net Supplements",
         help="Monthly net amount the employee receives.")
     retained_net_amount = fields.Monetary(sting="Net Retained",
@@ -85,6 +85,23 @@ class HrContract(models.Model):
             else:
                 contract.wage_with_holidays = contract.wage
 
+    def _inverse_wage_with_holidays(self):
+        for contract in self:
+            if contract.holidays > 20.0:
+                remaining_for_gross = contract.wage_with_holidays * (13.0 + 13.0 * 0.3507 + 0.92)
+                yearly_cost = remaining_for_gross \
+                    + 12.0 * contract.representation_fees \
+                    + 12.0 * contract.fuel_card \
+                    + 12.0 * contract.internet \
+                    + 12.0 * (contract.mobile + contract.mobile_plus) \
+                    + 12.0 * contract.transport_employer_cost \
+                    + (1.326 / 1.05 * 12.0) * contract.commission_on_target \
+                    + 220.0 * contract.meal_voucher_paid_by_employer
+                contract.final_yearly_costs = yearly_cost / (1.0 - (contract.holidays - 20.0) / 231.0)
+                contract.wage = contract._get_gross_from_employer_costs(contract.final_yearly_costs)
+            else:
+                contract.wage = contract.wage_with_holidays
+
     @api.depends('transport_mode', 'company_car_total_depreciated_cost',
         'public_transport_reimbursed_amount', 'others_reimbursed_amount')
     def _compute_transport_employer_cost(self):