Employee mileage deduction calculator
Work out the approved amount for qualifying employee business journeys in your own car or van. This is a deduction calculator, not a confirmed refund.
How the calculation works
The first 10,000 qualifying miles use the rate for the selected year. Further miles use 25p. Subtract your employer’s mileage payments. Your cash tax relief depends on tax paid, applicable rates, eligibility and earlier claims.
For example, 5,000 qualifying miles in 2026/27 with no employer payment give an approved amount of £2,750. If the entire deduction relieved income taxed at 20%, the illustration would be £550 of tax relief. Your actual result may differ.
Exclude ordinary commuting. This calculator does not cover company vehicles or sole-trader vehicle expenses. It does not add multiple years together or establish that you can backdate.
Read the full mileage guide and check the official employee rules.