How do I prove my mileage to HMRC?
A record made as you go, showing the date, business purpose and miles.
Last checked 12/09/2026.
There is no prescribed format. What HMRC expects is a record showing, for each journey or working day: the date, the business purpose, and the number of miles. Odometer readings at the start and end of a shift are the strongest evidence.
A log kept as you go carries far more weight than one reconstructed later, and it is what you want if HMRC ever asks. Keep it for at least 5 years after the January filing deadline for that tax year.
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