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Expenses & tax planning

Mileage claim calculator

Calculate a reimbursement using your agreed rate per kilometre. Keep the distance, rate and claim total together.

Free to useNo sign-up neededEditable example figures
01 / Your figures

Make it your estimate

Start with our example. Replace the figures with your own.

Include only the distance covered by your reimbursement agreement. Convert miles to kilometres first.
km
The £0.45 example is a custom rate per kilometre. It is not an HMRC-approved per-mile rate.
£ / km
Results update as you type.
02 / Your estimate

Estimated mileage reimbursement

£99.00

A custom-rate reimbursement, not a tax-relief calculation.

Here’s the breakdown

Business distance
220 km
Rate per kilometre
£0.45
Reimbursement
£99.00

Figures are rounded for display. Calculations use unrounded values.

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Understand your estimate

How the calculation works

Reimbursement = business distance in kilometres × agreed rate per kilometre.

A worked example

220 km at an agreed £0.45 per km gives a £99 reimbursement. Whether any payment is taxable depends on the applicable rules.

What to allow for

  • The example £0.45/km rate preserves the original calculator’s default. Replace it with your actual agreed rate.
  • HMRC mileage rules use miles and may depend on the vehicle, tax year and total annual mileage. This single-rate tool does not apply those rules or calculate tax relief.

Check the official guidance

GOV.UK business mileage rules

Useful questions

Can I enter miles?

Convert miles to kilometres using miles × 1.609344. Divide a per-mile reimbursement rate by 1.609344 to get the matching per-kilometre rate.

Is reimbursement the same as tax relief?

No. Reimbursement is a payment towards travel costs. Tax relief depends on eligibility, approved rates, your tax position and any amount already reimbursed.