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For equipment, vans, computers, and most other business assets, you enter the Annual Investment Allowance (AIA) directly in the Tax Computation section. Up to £1,000,000 per year can be claimed.
Cars have separate HMRC rules — they use Writing Down Allowance (WDA), not AIA. The rate depends on CO2 emissions:
- 0g/km (electric): 18% WDA (the 100% First Year Allowance for zero-emission cars ended 31 March 2025)
- 1–50g/km: 18% WDA
- Over 50g/km: 6% WDA
You calculate the allowance yourself based on the car's CO2 band and tax written-down value, then enter the figure in the Annual Investment Allowance field in the Tax Computation section. TinyTax includes it in your CT600 computations document automatically.
Full guide: https://tinytax.co.uk/support/company-car-capital-allowances