diff --git a/addons/l10n_be_hr_payroll_fleet/models/fleet.py b/addons/l10n_be_hr_payroll_fleet/models/fleet.py
index 543c4b72..372b3b3a 100644
--- a/addons/l10n_be_hr_payroll_fleet/models/fleet.py
+++ b/addons/l10n_be_hr_payroll_fleet/models/fleet.py
@@ -13,7 +13,8 @@ class FleetVehicle(models.Model):
 
     co2_fee = fields.Float(compute='_compute_co2_fee', string="CO2 Fee")
     total_depreciated_cost = fields.Float(compute='_compute_total_depreciated_cost',
-        string="Total Cost (Depreciated)", help="This includes all the depreciated costs and the CO2 fee")
+        string="Total Cost (Depreciated)", track_visibility="onchange",
+        help="This includes all the depreciated costs and the CO2 fee")
     total_cost = fields.Float(compute='_compute_total_cost', string="Total Cost", help="This include all the costs and the CO2 fee")
     fuel_type = fields.Selection(required=True, default='diesel')
     atn = fields.Float(compute='_compute_car_atn', string="ATN")
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 26bd27ad..ebb2349d 100644
--- a/addons/l10n_be_hr_payroll_fleet/models/hr_contract.py
+++ b/addons/l10n_be_hr_payroll_fleet/models/hr_contract.py
@@ -25,7 +25,7 @@ class HrContract(models.Model):
         'car_id.log_contracts.recurring_cost_amount_depreciated') # the fleet vehicle to avoid these dependencies
     def _compute_car_atn_and_costs(self):
         for contract in self:
-            if contract.car_id:
+            if not contract.new_car and contract.car_id:
                 contract.car_atn = contract.car_id.atn
                 contract.company_car_total_depreciated_cost = contract.car_id.total_depreciated_cost
             elif contract.new_car and contract.new_car_model_id: