Mileage Reimbursement Calculator
Estimate HMRC approved mileage amounts, employer payments, possible tax relief and passenger payments for UK business miles.
Calculate mileage reimbursement
Enter your business miles, vehicle type and employer rate. The calculator estimates the HMRC approved amount, any shortfall and possible mileage tax relief.
Your estimate will appear here.
How the mileage reimbursement calculator works
This calculator compares your employer's mileage payment with the HMRC approved amount for your vehicle type. If your employer pays less than the approved amount, the difference is the shortfall that may qualify for mileage allowance relief.
For cars and vans, the first 10,000 business miles in the tax year use a higher rate. Miles above that threshold use the lower rate. Motorcycle and bicycle rates are flat, so they do not change after 10,000 miles.
Approved amount = business miles × HMRC approved mileage rate
Employer paid = business miles × employer pence-per-mile rate
Shortfall = approved amount − employer paid
Estimated tax relief = shortfall × your tax rateHMRC mileage rates used in this calculator
The calculator uses the approved mileage rates for the 2026 to 2027 tax year. These rates are for business miles in your own vehicle, not normal commuting.
What counts as business mileage?
Business mileage usually means work-related journeys that are not your ordinary commute. For example, driving from your normal workplace to a client meeting may qualify, while driving from home to your usual workplace normally does not.
An approved mileage allowance payment is the tax-free mileage amount your employer can pay up to the HMRC limit. If your employer pays less, you may be able to claim relief on the difference.
Mileage reimbursement examples
How to read the tax relief estimate
The tax relief figure is not the full shortfall paid back to you. It estimates the tax saving on the shortfall. For example, if the shortfall is £100 and your tax rate is 20%, the tax relief estimate is £20.
If your employer pays more than the approved amount, the calculator shows a possible taxable excess. That does not automatically mean your payslip is wrong, but it is a sign to check the payment treatment.
FAQs
Can I claim mileage for commuting?
Ordinary travel between home and your usual workplace is not normally claimable business mileage. The calculator includes a warning toggle because this is one of the most common mistakes.
What if my employer pays 45p per mile?
For 2026/27, cars and vans use 55p per mile for the first 10,000 business miles. If your employer pays 45p, there may be a 10p-per-mile shortfall on miles in the first band.
Can I include passengers?
Passenger payments only apply to cars and vans. The calculator adds 5p per passenger business mile when the vehicle type is car or van.
Is this calculator tax advice?
No. It is an estimate based on the inputs you enter. Check HMRC guidance or speak to a qualified adviser if your situation is complex.
Useful glossary terms
These terms help explain the calculation and the rules around UK mileage payments.
Check the full cost of using your car
Mileage reimbursement only tells part of the story. Fuel, insurance, depreciation, servicing and parking can all change the real cost of driving.
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