Capital Allowances Explained: What UK Businesses Can Claim and How to Claim Them

Tax Queen

Tax Expert @ Pie

9 min read

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Capital allowances are tax reliefs that allow businesses to deduct some or all of the cost of qualifying assets from their taxable profits. They can apply when you buy equipment, machinery, certain vehicles or qualifying fixtures for your business. Depending on your business structure, claims are made through your Self Assessment or Company Tax Return.

The rules determine how quickly you can receive tax relief on a purchase. Some qualifying expenditure can receive 100% relief in the year you buy it, while other costs are relieved over several years. Understanding the rules can help you plan larger business investments and manage your tax position.

This guide explains the main types of capital allowances, what can qualify and how to make a claim. It also covers commercial property, Writing Down Allowances and common mistakes. Keeping accurate records throughout the year can make completing your Self Assessment easier.

What are Capital Allowances and Why Should You Care?

Capital allowances are a form of tax relief for businesses. They allow you to deduct qualifying capital expenditure from your taxable profits, subject to the rules for the relevant allowance. HMRC sets the conditions that determine which assets qualify and how much relief is available.

Capital allowances are different from accounting depreciation. Depreciation is an accounting treatment, while capital allowances determine the tax relief available on qualifying capital expenditure. The two should not be treated as interchangeable when preparing your tax return.

For many businesses, the Annual Investment Allowance can provide significant upfront relief. Other allowances may provide full or partial relief in the year an asset is purchased, while Writing Down Allowances spread relief over time. Capital allowances are also important when buying or refurbishing commercial property because certain fixtures and integral features may qualify.

Understanding Capital Expenditure

Capital expenditure generally covers money spent buying or improving long-term business assets. This can include machinery, equipment, vehicles and certain fixtures. The distinction between capital and revenue expenditure matters because the two are treated differently for tax purposes.

Some qualifying expenditure can receive 100% relief immediately, while other expenditure is allocated to a capital allowances pool. Writing Down Allowances can then provide relief against the remaining balance over time. The allowance available depends on the asset and the circumstances of the business.

Understanding the rules before making a major purchase can help you plan when tax relief will be available. This can be particularly useful when investing in equipment or carrying out a commercial property refurbishment. Keeping the relevant invoices and purchase information will also make your Self Assessment records easier to manage.

Types of Capital Allowances You Should Know About

The Annual Investment Allowance (AIA) is one of the main capital allowances available to businesses. The AIA limit is £1 million for each accounting period, subject to special rules where an accounting period is shorter or longer than 12 months. It generally allows 100% of qualifying expenditure on most plant and machinery to be deducted from profits in the year of purchase.

A new 40% first-year allowance applies to qualifying main-rate plant and machinery bought on or after 1 January 2026. It is available to companies and unincorporated businesses, provided the asset is new and unused and meets the other conditions. Cars are excluded, while the remaining 60% can generally be relieved through Writing Down Allowances.

Full expensing is available to qualifying companies and provides a 100% first-year deduction for eligible new and unused main-rate plant and machinery. A 50% first-year allowance can apply to qualifying special-rate assets, while qualifying zero-emission cars and electric vehicle chargepoints can receive 100% first-year allowances within the current time limits. Writing Down Allowances apply where expenditure has not been fully relieved, with the main pool rate at 14% from 1 April 2026 for Corporation Tax and 6 April 2026 for Income Tax, while the special rate remains 6%; the Structures and Buildings Allowance provides relief at 3% a year on qualifying expenditure.

What Actually Qualifies for Capital Allowances?

Plant and machinery covers more than traditional industrial equipment. Qualifying expenditure can include machinery, business equipment, certain vehicles, computers and some fixtures and integral features in commercial properties. In appropriate circumstances, capital expenditure on computer software may also fall within the capital allowances regime.

Integral features can include:

Electrical systems, including lighting
Heating systems
Air conditioning and air cooling systems
Hot and cold water systems
Lifts, escalators and moving walkways
External solar shading

Certain fixtures can also qualify, including fitted kitchens, bathroom suites, fire alarm systems and CCTV, depending on the circumstances. The rules can be different for residential property, and plant or machinery used in a dwelling as part of an ordinary property business is generally excluded, subject to specific exceptions. Companies should also consider whether expenditure on software falls within the separate intangible fixed assets regime.

Special Rules Worth Knowing About

The Super-deduction provided 130% relief for qualifying expenditure during its temporary period, but it ended for expenditure after 31 March 2023. It should therefore not be confused with the full expensing rules that apply to qualifying companies. Business cars also have separate capital allowances rules based on factors such as their CO2 emissions.

Commercial property transactions need particular attention because fixtures can qualify for capital allowances. Where a property containing fixtures changes hands, the buyer and seller may need to agree the relevant value and follow specific election rules. A fixtures election can generally be made up to 2 years after the buyer acquires the property or is granted the lease.

Disposing of an asset on which capital allowances have been claimed can also result in a balancing adjustment. Depending on the circumstances, this can create a balancing charge or balancing allowance. The calculation depends on factors including the relevant pool, disposal value and allowances already claimed, so accurate records should be kept throughout the asset's life.

Commercial Property and Capital Allowances

Capital allowances can be an important consideration when buying, owning or refurbishing commercial property. Qualifying expenditure on items such as heating, air conditioning, electrical systems, lifts and certain fixtures can potentially reduce taxable profits. The AIA can provide 100% relief on qualifying plant and machinery expenditure up to the £1 million limit, where the expenditure meets the conditions.

Not every property cost qualifies for plant and machinery allowances. The cost of the building itself is generally not treated as plant and machinery, although qualifying structures and buildings may qualify for the separate Structures and Buildings Allowance. This makes it important to identify qualifying expenditure rather than treating the whole property cost in the same way.

Residential property follows different rules from commercial property. The previous Furnished Holiday Lettings regime was abolished from 6 April 2025 for Income Tax and 1 April 2025 for Corporation Tax, so the old capital allowances treatment should not be relied on for new expenditure. Transitional rules can apply to existing pools, making the position particularly important to check when dealing with former furnished holiday lets.

How To Claim Capital Allowances Properly

Good record keeping is essential when claiming capital allowances. Keep details of qualifying purchases, including the date, description, cost, invoice and how the asset is used in the business. These records can help you support the claim and complete your Self Assessment accurately.

Sole traders generally claim capital allowances through their Self Assessment tax return, while partnerships make claims through the partnership tax return. Companies claim through their Company Tax Return and include a separate capital allowances calculation. The timing of the claim also matters, with AIA, first-year allowances and full expensing generally claimed for the accounting period in which the relevant expenditure is incurred.

You do not necessarily have to claim the maximum available amount. Depending on your circumstances, you may choose to claim part of an allowance and use Writing Down Allowances for the remaining expenditure. Accounting periods shorter or longer than 12 months can also affect the calculation, while capital allowances should be considered before completing a commercial property transaction.

Working with a Capital Allowances Specialist

Capital allowances can become more complicated when a business has multiple assets, a commercial property portfolio or different types of expenditure. It can be easy to overlook qualifying fixtures or put expenditure into the wrong pool. Reviewing the position before a major purchase or refurbishment can help identify the relevant allowances.

A capital allowances specialist can help identify qualifying expenditure and determine whether AIA, a first-year allowance or Writing Down Allowances may be available. This can be particularly relevant for commercial property purchases and refurbishment projects. The rules surrounding fixtures and property transactions can also require careful attention.

Even where specialist advice is not needed, clear records remain important. Keeping details of what you bought, when you bought it, how much it cost and how it is used can make your Self Assessment easier to complete. It can also help you identify qualifying expenditure that might otherwise be missed.

Common Mistakes to Avoid

One common mistake is overlooking qualifying assets. Businesses may identify obvious equipment but fail to consider fixtures, integral features or other qualifying expenditure. Reviewing the full cost of a project can help identify assets that may qualify.

Another mistake is assuming every asset qualifies for the Annual Investment Allowance. Business cars are excluded from AIA and follow separate rules, while different first-year allowances have their own eligibility conditions. It is also important not to confuse the 40% first-year allowance with full expensing, as full expensing is available only to qualifying companies.

Using the wrong Writing Down Allowance pool can also affect the timing of tax relief. The main rate is 14%, while the special rate is 6% from the relevant 2026 change dates. Capital allowances rules can change, so businesses should avoid relying on rates or temporary reliefs from an earlier tax year.

Final Thoughts

Capital allowances can provide valuable tax relief when your business invests in equipment, machinery, vehicles, fixtures or qualifying property improvements. The allowance available depends on the type of asset, how it is used and the circumstances of the business. Understanding these rules can help you plan your tax position more effectively.

For businesses completing Self Assessment, keeping accurate records of capital purchases throughout the year can make the tax return easier to complete. It can also help you identify whether qualifying expenditure has been overlooked. This is particularly useful when several assets are purchased as part of a larger investment or refurbishment.

If you are planning a major purchase or commercial property transaction, consider the capital allowances position before committing to the expenditure. The timing and type of purchase can affect which relief is available. Get started with Pie Tax for free or download the app to see how it works for yourself.