Last updated: 3 May 2026
Use your own car for work? You could be owed up to £1,800 a year from HMRC — and most workers never claim it.
HMRC’s approved rate is 45p per mile (for the first 10,000 business miles). If your employer pays less than that — or nothing at all — you can claim the difference back as a tax refund. Carers, sales reps, NHS staff, mobile engineers and contractors are most often owed money. Use the calculator below to see how much you could claim, backdated up to 4 tax years.
Mileage Allowance Tax Refund Calculator
Find out in 30 seconds how much HMRC owes you for using your own vehicle for work. All calculations run in your browser — nothing is sent or saved.
Must be your own personal vehicle, not a company car. Electric vehicles use the same rates as petrol/diesel.
Only count travel to temporary workplaces, client visits, or between work locations. Ordinary commuting (home to regular workplace) does NOT count.
Enter as £ per mile (e.g. 0.25 for 25p, 0 if employer pays nothing). Check your payslip or expenses policy.
You can backdate up to 4 prior tax years (so 5 years total including this one).
This is an estimate based on HMRC’s Approved Mileage Allowance Payment (AMAP) rates for 2026/27 and assumes consistent mileage and tax bands across the years claimed. Your actual entitlement depends on your real records. HMRC may ask for a mileage log showing dates, destinations, business purposes, and miles. Always check with HMRC before relying on these figures. We are not a regulated tax adviser.
✓ Free to use · ✓ No sign-up · ✓ No personal data stored · ✓ Updated for 2026/27 tax year
Ready to claim?
Apply directly to the official UK government source — no fees, no middlemen.
Apply on GOV.UK →Frequently asked questions
How much can I claim per business mile?
HMRC allows 45p per mile for the first 10,000 miles in a tax year, then 25p per mile after that. Motorbikes are 24p, bicycles 20p.
Can I claim mileage if my employer pays me less than 45p?
Yes — you can claim Mileage Allowance Relief on the difference between what your employer paid and HMRC's 45p approved rate.
Can I backdate a mileage claim?
Yes — you can claim mileage allowance up to four tax years back. Keep a log of your business journeys with dates, destinations and miles.