The Annual Investment Allowance (AIA) is part of the UK’s Capital Allowances regime designed to encourage business growth by allowing companies to deduct 100% of the cost of qualifying assets from their taxable profits in the year of purchase.
The maximum amount of qualifying expenditure eligible for this 100% first-year deduction is strictly capped at £1 million per year. This article answers frequently asked questions on the AIA to help you claim capital allowances most efficiently.
How does the annual investment allowance work?
- Main Pool: 18% up until 31 March 2026, and 14% from April 2026 onwards.
- Special Rate Pool: 6% for specific integral features and long-life assets.
While standard allowances spread your tax relief across several years, the AIA accelerates your savings by front-loading the entire deduction into year one. Crucially, the AIA is time-sensitive and must be claimed in the accounting period the expenditure was incurred. If you miss this window, you lose the right to the 100% first-year deduction, and the cost must be written off more slowly over a number of years.
Who can claim annual investment allowance?
AIA can be claimed by an individual, partnership, or company carrying on a qualifying activity, such as a trade, or ordinary property business. Partnerships or trusts with a mixture of individuals and companies in the business structure are unable to qualify for AIA.
Can I reduce my tax bill by incurring expenditure on large items?
The timing of the expenditure determines which tax year any AIA falls into. The tax benefits are likely to be a secondary concern to having the asset for operational needs, however if there is some flexibility in when it is required, the timing of a purchase could impact tax liabilities. This could mean looking at accelerating plans, where possible, to incur expenditure before or after the end of the financial year and maximise tax relief.[CC4]
What business assets are eligible for the annual investment allowance (AIA)?
The AIA is available for most assets purchased by a business such as:
- Plant & machinery
- Certain fixtures and fittings
- Office equipment
- Some vehicles used in the business (e.g. vans, lorries)
What assets are excluded from the annual investment allowance (AIA)?
Some assets are excluded from the AIA, including:
- Cars
- Items you already owned before they were used for your business
- Gifts
- Items purchased from a connected person or company
- Items not used in the business
Also excluded is expenditure incurred in the final accounting period of the business.
If 2 or more limited companies are controlled by the same person, they only get one AIA between them.
What happens if my business expenditure exceeds the Annual Investment Allowance (AIA)?
If your capital expenditure exceeds the maximum £1 million AIA cap, you cannot claim the [CC5] 100% immediate deduction on the surplus amount. Instead, the remaining balance can be claimed through standard Writing Down Allowances (WDAs).
Do businesses have to claim the full Annual Investment Allowance (AIA)?
No, businesses are not legally required to claim the full £1 million Annual Investment Allowance (AIA). Under UK tax rules, you have complete flexibility to claim all, part, or even none of the AIA on your qualifying capital expenditure.
What happens if my business buys something that costs more than the Annual Investment Allowance (AIA)?
If your business buys something that exceeds the AIA of £1 million, it can claim a writing down allowance on the amount exceeding the AIA.
What happens if my business sells an asset when we’ve already claimed an Annual Investment Allowance (AIA) on it?
It’s fine to sell an asset that your business has already claimed an Annual Investment Allowance (AIA) on. You’ll just have to pay a balancing charge. If you’ve already claimed the full amount as an AIA, add the amount the asset has been sold for back into your taxable profits, and this will be your balancing charge.
How Leyton can help
Our team of Capital Allowances specialists come from a wide range of industries, including quantity surveyors, chartered accountants, and tax professionals. Their technical and tax expertise allows them to uncover every asset eligible for tax relief as well as give guidance on how to make the most of the tax relief available.
Get in touch today to find out how they can help your business.
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