Mileage and vehicle costs: what should I do in this calculator?

A guide to vehicle-related expenses at a high level and how to translate your records into a single annual profit input.

This tool does not collect a vehicle breakdown; it uses profit after allowable expenses.
Use one method consistently so your profit number is comparable year to year.
If you are unsure, verify your approach using GOV.UK guidance.

What to enter

Do not invent a vehicle number for this calculator. Compute annual profit using your chosen record method, then enter the resulting profit.

Vehicle use is often mixed business and personal. The key is a reasonable, documented method so your profit number is defensible.

Claiming everything as business without a method, or switching methods mid-year and losing comparability.

Not tax advice. This page is an educational guide. For official rules, verify the sources below.

Last updated: 2026-04-20

Can I enter mileage directly?

No. Enter profit after you have reflected vehicle costs in your records.

Will the calculator pick the best method?

No. It is a simple estimator and does not optimise your filing.

Where can I verify the rules?

Use the GOV.UK expenses guidance for vehicles.

For official rules and definitions, verify with the references below.