Mileage Allowance Relief Calculator
Calculate claimable tax relief from the shortfall between HMRC approved mileage and employer reimbursement.
Mileage Allowance Relief Calculator
Miles driven
Vehicle
Employer reimbursement rate (GBP/mile)
Tax band
Results
Approved mileage amount
£6,000.00
Employer paid
£3,600.00
Shortfall
£2,400.00
Tax relief claim estimate
£480.00
When you can claim
Mileage allowance relief may apply when you use your own vehicle for qualifying business journeys and your employer pays less than the HMRC-approved amount. Relief is based on the shortfall, not the full mileage amount.
- Use business miles only; ordinary commuting does not count.
- For 2026-27, cars and vans use 55p for the first 10,000 business miles, then 25p after that; motorcycles use 24p for all business miles; bicycles use 20p for all business miles.
- Keep your mileage log and employer payment records, then use P87 or Self Assessment for the claim route that fits.