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 e8bfc7e1673..fa25a65d8d8 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
@@ -176,6 +176,16 @@ class HrContract(models.Model):
             contract.double_holidays = contract.wage * 0.92
             contract.thirteen_month = contract.wage
 
+    @api.onchange('transport_mode')
+    def _onchange_transport_mode(self):
+        if self.transport_mode != 'company_car':
+            self.fuel_card = 0
+            self.company_car_total_depreciated_cost = 0
+        if self.transport_mode != 'others':
+            self.others_reimbursed_amount = 0
+        if self.transport_mode != 'public_transports':
+            self.public_transport_reimbursed_amount = 0
+
     @api.onchange('mobile', 'mobile_plus')
     def _onchange_mobile(self):
         if self.mobile_plus and not self.mobile:
diff --git a/addons/l10n_be_hr_payroll_fleet/models/hr_contract.py b/addons/l10n_be_hr_payroll_fleet/models/hr_contract.py
index 7f802498934..f774eaa0436 100644
--- a/addons/l10n_be_hr_payroll_fleet/models/hr_contract.py
+++ b/addons/l10n_be_hr_payroll_fleet/models/hr_contract.py
@@ -46,6 +46,13 @@ class HrContract(models.Model):
         self.car_id = self.env['fleet.vehicle'].search([('driver_id', '=', self.employee_id.address_home_id.id)], limit=1)
         return {'domain': {'car_id': self._get_available_cars_domain()}}
 
+    @api.onchange('transport_mode')
+    def _onchange_transport_mode(self):
+        super(HrContract, self)._onchange_transport_mode()
+        if self.transport_mode != 'company_car':
+            self.car_id = False
+            self.new_car_model_id = False
+
     def _get_available_cars_domain(self):
         return ['|', ('driver_id', '=', False), ('driver_id', '=', self.employee_id.address_home_id.id)]