When you take out a lease contract, you agree to a set annual mileage amount to help determine how much you will need to pay for the lease car per month. The finance company are expecting to collect a car from you that has a mileage equal to or under the agreed amount per year. If you go over the agreed mileage amount, you will need to pay an excess mileage charge to compensate the finance company for your error. Find out more about mileage fees on our excess mileage page.