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HMRC Mileage Allowance Calculator
Step 1 of 20%
How it works
Multiply business miles by the AMAP rate. If your employer reimburses less than AMAP, you can claim the difference back via tax relief at your marginal rate (so a basic-rate taxpayer recovers 20% of the shortfall).
Worked example
12,000 business miles, employer pays 25p/mile → AMAP entitlement: (10,000 × 45p) + (2,000 × 25p) = £5,000. Employer paid £3,000. Shortfall £2,000 × 20% basic rate = £400 tax relief claim via P87 or self-assessment.
Who should use this
- •Employees using own car for work travel
- •Self-employed sole traders
- •Anyone with unreimbursed business mileage
Common mistakes
- ×Claiming for ordinary commuting (not allowable)
- ×Mixing up cars and motorcycles
- ×Forgetting to keep a mileage log (date, journey purpose, miles)
- ×Claiming AMAP when employer already pays it in full (only the shortfall is claimable)
Frequently asked questions
How do I claim mileage tax relief?▾
Self-assessment if you file one, otherwise online form P87 if total relief is under £2,500/year.
Are tolls and parking included?▾
No — tolls, parking, congestion charge are separately claimable as actual costs.
Does AMAP cover EVs?▾
Yes — AMAP rate is the same regardless of fuel type for personally-owned vehicles.