If you use your own car for a business journey, perhaps to travel to a customer, you can claim mileage expenses for that journey. Many employers pay the full taxfree amount of 45p per mile, which drops to 25p for miles in excess of 10,000 in one tax year.
If your employer doesnt pay the full rate, you can claim tax relief on the shortfall, either on your tax return or on form P87. You need to submit your claim within four years of the end of the tax year in which you made the business journey. Claims for 2015/16 must reach the tax office by 5 April 2020.
Once HMRC has accepted your mileage claim for one tax year, subsequent claims for up to £1,000 per year can be made by phoning the tax office on 0300 200 3300.
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