The 10,000 mile threshold, worked
The mileage rate for a car drops from 55p to 25p after 10,000 business miles in a tax year. The threshold resets on 6 April, it counts business miles only, and a full-time driver usually passes it before the year is half done.
Correct for the 2026/27 tax year. Last checked 12/09/2026.
Most drivers know the rate is 55p. Fewer know it stops being 55p partway through their year, and for a full-time driver that happens sooner than expected.
The two rates
| Business miles in the tax year | Rate per mile |
|---|---|
| First 10,000 | 55p |
| Every mile after that | 25p |
Motorcycles and bicycles have their own single rates with no threshold at all.
A full year, worked
A driver covering 24,000 business miles in a tax year.
| Band | Miles | Rate | Claim |
|---|---|---|---|
| First 10,000 | 10,000 | 55p | £5,500.00 |
| Remainder | 14,000 | 25p | £3,500.00 |
| Total | 24,000 | £9,000.00 |
At a flat 55p the same mileage would have been £13,200.00. The threshold costs this driver £4,200.00 of deduction, which at basic rate plus Class 4 is around £1,180.00 of extra tax.
When you cross it
A full-time driver doing 500 business miles a week crosses 10,000 in twenty weeks, so around the end of August in a year starting in April. From that point the deduction per mile more than halves while the fuel cost does not change at all.
Does it change the method?
It is one of the few things that can. A very high-mileage driver in an expensive vehicle may find actual costs better precisely because so many miles fall at 25p. The decision is per vehicle and it sticks, so it is made before the first claim rather than after. Simplified mileage against actual costs covers it.
Sources
Common questions
- Does the threshold reset every year?
- Yes, on 6 April with the tax year. A driver who did 24,000 business miles last year starts the new year back on the higher rate.
- Is it per vehicle or per person?
- Per person, per tax year, across the business. Changing car halfway through the year does not give you a fresh threshold.
- Do personal miles count towards it?
- No. Only business miles count, which is another reason the log has to distinguish them.
- Why does the rate drop at all?
- The 55p rate is meant to include a contribution towards the fixed costs of having a vehicle: insurance, tax, depreciation. Once 10,000 miles have covered those, the 25p rate reflects only the running cost of an extra mile.
- Is the lower rate enough to cover my costs?
- Often not. 25p is close to fuel alone for many cars, which means a high-mileage driver is under-relieved on the miles above the threshold. It is a fixed rule rather than a reimbursement.
About the author
Issac Davies, Founder of JoltMile
Issac Davies drives for gig apps in the UK and built JoltMile to show drivers what a shift actually pays once fuel, insurance and tax come off. Every guide here is checked against HMRC and gov.uk guidance, and is information rather than tax advice.
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Business mileage · Estimated tax: the JoltMile app works this out from your own shifts. Free for 12 shifts a month.
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