31/12/2025
https://www.gov.uk/simpler-income-tax-simplified-expenses/vehicles-
In the UK, WDA stands for Writing Down Allowance (a type of capital allowance) and is related to how businesses can claim tax relief on assets like vehicles. The mileage is an alternative, simplified method for claiming vehicle expenses.
You can generally use either the mileage allowance method or claim writing down allowances and actual running costs for a vehicle, but not both for the same vehicle.
Mileage Allowance (AMAPs)
The HMRC-approved mileage rates, known as Mileage Allowance Payments (MAPs) or Approved Mileage Allowance Payments (AMAPs), are standard rates for using a personal vehicle for business journeys.
Vehicle First 10,000 business miles (per tax year) Each business mile over 10,000
Cars and vans 45p per mile 25p per mile
Motorcycles 24p per mile 24p per mile
Bicycles 20p per mile 20p per mile
An additional 5p per mile can be claimed for each passenger who is also a fellow employee travelling on business. These payments are tax-free up to the approved amount.
Writing Down Allowance (WDA)
Writing Down Allowances are a form of capital allowance that lets you deduct a percentage of the value of certain items, including business cars, from your profits each year. This method requires you to calculate actual running costs (fuel, insurance, repairs, etc.) rather than using the flat mileage rate.
The WDA rate for cars depends on their CO₂ emissions:
0g/km (electric): Qualifies for a 100% first-year allowance (FYA) if new, or 18% WDA if used.
1g/km to 50g/km: Main rate WDA (currently 18%).
Over 50g/km: Special rate WDA (currently 6%).
Key Point
You must choose which method to use for a specific vehicle:
If you claim the mileage allowance (AMAPs), you cannot also claim capital allowances (like WDA or AIA) for that vehicle.
If you claim actual running costs, you can also claim WDA on the vehicle's purchase price.
More detailed guidance is available on the official GOV.UK website for employees and the GOV.UK website for simplified expenses for the self-employed.
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