When a business purchases assets for long‑term use, the cost of those assets is normally not deducted as a day‑to‑day expense in the accounts. Instead, UK tax rules allow businesses to claim capital allowances, which provide tax relief for qualifying expenditure.
Capital allowances let a business claim tax relief on qualifying capital expenditure by deducting specified amounts from taxable profits. This reduces the amount of corporation tax your business pays.
Qualifying expenditure typically includes:
Plant and machinery
Tools and equipment
Certain business vehicles
Fixtures and fittings in business premises
Each category has specific rules determining how and when the relief can be claimed.
The Annual Investment Allowance (AIA) is one of the most valuable capital allowance reliefs available. It allows businesses to claim 100% tax relief on qualifying expenditure up to the AIA limit in the year of purchase.
This means that most assets bought in the course of trade can be deducted in full from taxable profits in the period the cost was incurred, subject to the annual limit. AIA applies to most plant and machinery purchases — but not to cars.
Claiming AIA can significantly improve cash flow, particularly when large capital outlays are incurred.
Where capital expenditure cannot be fully relieved under AIA (for example, if the limit has been exceeded or the item doesn’t qualify), the cost is placed into a capital allowances pool and relief is claimed over time.
Under writing down allowances:
Assets are grouped in pools
A fixed percentage of the pool value is relieved each year
This spreads tax relief over several years
Different rates may apply depending on the type of asset.
Cars are treated differently for capital allowances:
Relief is restricted and usually not available for the full cost
The rate of allowance depends on the car’s CO₂ emissions
Low‑emission and electric cars often attract better relief than high‑emission vehicles
This treatment encourages investment in greener vehicles and reflects policy priorities.
Capital allowances can also apply to certain non‑residential structures and buildings under the Structures and Buildings Allowance.
SBA provides relief for qualifying construction or renovation costs over a fixed period, recognising that such investments are essential but long‑term in nature. Specific eligibility conditions and record requirements apply, so good documentation is important.
When an asset for which capital allowances have been claimed is sold or otherwise disposed of, a balancing adjustment may arise. This can result in:
Additional taxable income (if proceeds exceed the tax written‑down value), or
An extra tax deduction (if proceeds are less than the tax written‑down value)
Proper planning and timing of disposals can help manage the tax impact.
To support capital allowance claims, businesses should maintain:
Invoices and receipts for qualifying assets
Descriptions of assets and their intended use
Dates of purchase and disposal
Pooling and allowance calculations
Accurate records are essential if HMRC queries the claim or during a compliance review.
Capital allowance rules are technical and can vary significantly by asset type and use. Professional advice can make a real difference in ensuring your business claims every pound of relief available.
Applegrow Financial Advisors can assist you with:
Identifying qualifying assets
Maximising use of AIA and other allowances
Applying correct rates and pools for writing down allowances
Advising on cars, structures, and special categories
Handling balancing adjustments and disposals
Ensuring records are compliant and audit‑ready
With expert support, you can reduce your tax bill and improve cash flow while staying within the HMRC framework.
Contact Applegrow Financial Advisors today for expert guidance on claiming capital allowances and optimising your business tax position.
