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Capital allowance

CT 600 is not showing capital allowance to claim how can I include capital allowance to claim

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T
Tim Fouracre Staff 12 Feb 2026 at 13:01
Thanks for getting in touch! You can claim capital allowances through the Annual Investment Allowance (AIA) field, which you'll find in the Tax Computation section of the submission form.

Simply enter the total amount you're claiming — this will be deducted from your taxable profits automatically.

A couple of things to note:

- The AIA covers most capital purchases (equipment, machinery, fixtures, etc.) up to £1,000,000 per year

- You'll need to calculate the amount you're claiming yourself — TinyTax doesn't calculate this automatically

- Remember that accounting depreciation is a separate thing — it gets added back in the tax computation, and the AIA replaces it as your tax-deductible amount

We also have a guide that walks through the process step by step: https://www.tinytax.co.uk/support/guides/capital-allowances-aia