Capital allowances and the Annual Investment Allowance explained

What are Capital Allowances?

When your business buys assets like machinery, equipment, or vehicles, these are generally considered 'capital expenditure' rather than day-to-day running costs. Unlike regular expenses, you can't usually deduct the full cost of a capital asset from your profits in the year you buy it.

Instead, tax relief is provided through capital allowances. This system allows you to deduct a portion of the asset's cost from your taxable profits over time, or sometimes immediately, depending on the type of allowance. This effectively replaces accounting depreciation for tax purposes.

Capital allowances are available to limited companies, sole traders, and partnerships, provided their trading profits are subject to UK Corporation Tax or Income Tax.

Understanding the Annual Investment Allowance (AIA)

The Annual Investment Allowance (AIA) is a significant capital allowance that lets most UK businesses deduct 100% of the cost of qualifying plant and machinery from their taxable profits in the year of purchase. This means you get full tax relief upfront, which can be a great boost to your cash flow.

For the 2026/27 tax year, the AIA limit remains at £1 million per accounting period. If your business spends up to this amount on eligible assets, you can claim the full £1 million deduction.

Key points about AIA:

• 100% relief: You can deduct the entire cost of qualifying assets up to the annual limit.
• Includes used assets: Unlike some other allowances, AIA can be claimed on both new and second-hand qualifying assets.
• Excludes cars: Cars generally do not qualify for AIA.
• Shared limit: If you run multiple businesses under common control or within a group of companies, you'll share a single £1 million AIA limit across all of them.
• Pro-rated: If your accounting period is shorter or longer than 12 months, the £1 million limit is adjusted proportionally.

How Capital Allowances Reduce Your Tax Bill

Capital allowances directly reduce your taxable profits. The lower your taxable profits, the less tax your business has to pay.

Here's a simplified example:

1. Imagine your business makes a taxable profit of £150,000 before capital allowances.
2. You purchase new machinery for £80,000 that qualifies for 100% AIA.
3. You deduct the £80,000 from your taxable profits.
4. Your new taxable profit becomes £70,000 (£150,000 - £80,000).
5. You then pay Corporation Tax or Income Tax on this reduced figure of £70,000, rather than £150,000.

This immediate reduction in taxable profit can significantly improve your business's cash flow, making it more affordable to invest in growth.

Other Capital Allowances for 2026/27

While AIA is very popular, other allowances are available, especially if your expenditure exceeds the AIA limit or doesn't qualify for it:

• Full Expensing (for companies): For companies subject to Corporation Tax, full expensing allows a 100% deduction for the cost of new and unused main rate plant and machinery in the year of purchase. This is a permanent measure and has no financial cap, making it highly valuable for large investments. It does not apply to assets acquired for leasing or second-hand assets.
• New 40% First-Year Allowance (FYA): Introduced from 1 January 2026, this allows businesses (including unincorporated businesses and those acquiring assets for leasing) to deduct 40% of the cost of qualifying main pool assets in the year of purchase. This is useful if AIA has been fully used or is unavailable.
• Writing Down Allowances (WDAs): If an asset doesn't qualify for AIA or a first-year allowance, or if its cost exceeds the AIA limit, the remaining balance is added to a 'pool' and relieved over time using Writing Down Allowances.
• From April 2026, the main rate WDA has reduced from 18% to 14% per year on a reducing balance basis.
• The special rate WDA (for integral features, long-life assets, and high-emission cars) remains at 6% per year.
• Structures and Buildings Allowance (SBA): This allows a 3% annual deduction on the cost of new non-residential structures and buildings, or qualifying renovations, over a fixed period of 33 and a third years.

What Qualifies for Capital Allowances?

Generally, capital allowances apply to 'plant and machinery' used in your business.

Common examples include:

• Office equipment (computers, printers, furniture)
• Tools and machinery
• Commercial vehicles (vans, lorries, some cars)
• Fixtures and fittings integral to a building (e.g., heating, lighting, air conditioning, electrical systems)
• Computer software (in some cases)

Assets that typically do not qualify for AIA or full expensing include:

• Land and buildings themselves (though SBA may apply to structures)
• Items used for entertainment (e.g., a yacht)
• Cars (though specific rules apply, and 100% FYAs are extended for zero-emission cars until March/April 2027)

Common mistakes

• Not claiming: Many businesses simply don't claim the allowances they're entitled to, missing out on significant tax savings.
• Misclassifying assets: Incorrectly categorising an asset can lead to claiming the wrong type or rate of allowance.
• Missing deadlines: While there's generally no time limit to claim capital allowances if an asset is still owned and used in the trade, it's best to claim them in the correct tax year to maximise immediate relief.
• Ignoring integral features: Overlooking embedded fixtures within commercial property can mean missing out on substantial claims.
• Incorrectly applying AIA to cars: Remember that cars are generally excluded from AIA.