May 8
When your business buys equipment, a vehicle, machinery, or fits out new premises, the tax treatment is not the same as a normal day-to-day running cost. In your accounts, you may depreciate the asset over time, but depreciation is not usually deductible for tax purposes. Instead, tax relief is given through capital allowances.
Capital allowances are the mechanism through which UK businesses claim tax relief on qualifying capital spending. Get them right and they can make a meaningful difference to your tax bill each year. Get them wrong — or miss them entirely — and you could be paying more tax than you need to.
This guide walks you through the main types of capital allowances available to UK businesses, what qualifies, and how to make sure you are not leaving relief unclaimed.
When you buy a business asset, the cost is usually treated as capital expenditure rather than a revenue expense. That means you cannot simply deduct accounting depreciation from your taxable profits in the same way you would with rent, wages, insurance, or other trading costs.
Capital allowances are the tax system’s way of giving relief for qualifying capital expenditure. Depending on the asset and the allowance available, the relief may be given immediately or spread over a number of years.
The practical effect is that capital allowances reduce your taxable profits, which can reduce the amount of Corporation Tax or Income Tax you pay. For businesses making significant capital investments — in equipment, vehicles, technology, plant, or property — the value of these allowances can be substantial.
Capital allowances are available to different types of UK businesses, including limited companies, sole traders, and partnerships. However, not every allowance is available to every structure. For example, Full Expensing is only available to companies within the charge to Corporation Tax, while the Annual Investment Allowance is available more widely.
As accountants in Ireland and across the UK who specialise in tax efficiency for businesses at every stage, SCC works with clients to ensure capital allowances are properly identified, calculated, and claimed as part of a broader tax planning approach rather than an afterthought.
The Annual Investment Allowance is one of the most straightforward and widely used capital allowances. It gives businesses a 100% deduction on qualifying capital expenditure in the year the asset is purchased, up to the current annual limit of £1 million.
That means if you spend £80,000 on qualifying machinery, you may be able to deduct the full £80,000 from your taxable profits in the year you buy it, rather than spreading the relief over several years.
The £1 million limit is permanent, which gives businesses greater certainty when planning significant capital investment. For many SMEs, this limit is more than sufficient to cover qualifying expenditure in a typical year, meaning the full cost of many capital purchases can be deducted immediately.
The AIA applies to most types of plant and machinery, including equipment, manufacturing machinery, tools, fixtures, office furniture, and many types of business technology. However, it does not apply to cars, and it is not normally available for assets bought for leasing to someone else.
Full Expensing is a major capital allowance for companies within the charge to Corporation Tax. It allows companies to deduct 100% of the cost of qualifying new and unused main rate plant and machinery in the year the expenditure is incurred, with no upper limit.
For qualifying special rate assets, companies can claim a 50% first-year allowance. Special rate assets include items such as integral features of buildings, solar panels, long-life assets, and thermal insulation.
The key difference between Full Expensing and the AIA is that Full Expensing has no cap. For companies making very large capital investments that exceed the £1 million AIA limit, Full Expensing can provide significant immediate relief.
However, Full Expensing is not available for every asset. It does not apply to cars, second-hand assets, or most assets bought for leasing to others, although there are specific exceptions for certain background plant and machinery in buildings. If an asset has been claimed under Full Expensing and is later sold, a balancing charge may arise, so disposals need to be handled carefully.
From 1 January 2026, a new 40% First Year Allowance applies to qualifying expenditure on new and unused main rate plant and machinery.
This allowance is particularly relevant where a business cannot use Full Expensing, where the AIA has already been used, or where the asset is bought for leasing and does not fall within Full Expensing. It is also available more widely than Full Expensing, including to unincorporated businesses such as sole traders and partnerships, provided the qualifying conditions are met.
The 40% allowance does not apply to cars or special rate assets. After the first-year claim, the remaining balance is added to the relevant pool and relieved through Writing Down Allowances.
For most SMEs with qualifying expenditure below the £1 million AIA limit, AIA will often remain the first allowance to consider because it gives 100% relief. However, the 40% First Year Allowance is now an important part of the wider capital allowances landscape and should be considered as part of any larger investment plan.
For assets that do not qualify for AIA, Full Expensing, the 40% First Year Allowance, or another first-year allowance — or where expenditure remains after an initial claim — Writing Down Allowances provide relief at a percentage rate each year on the reducing balance of the pool.
There are two main pools:
The main pool — which covers most plant and machinery — now attracts a WDA of 14% per year. The main rate changed from 18% to 14% from 1 April 2026 for Corporation Tax and 6 April 2026 for Income Tax. If an asset cost £10,000 and no AIA, Full Expensing, or First Year Allowance was claimed, a 14% WDA would give relief of £1,400 in the first year, leaving a balance of £8,600 to carry forward.
The special rate pool — which covers long-life assets, integral building features, thermal insulation, solar panels, and certain other assets — attracts a WDA of 6% per year. This slower rate reflects the longer useful life of these assets.
Understanding which pool an asset falls into matters because the difference in relief rate is significant. Integral features are a common area of confusion, particularly for businesses that have fitted out or refurbished commercial premises. Ensuring that integral features are correctly identified and separately claimed is something our specialist tax team reviews carefully for every client with significant property expenditure.
The Structures and Buildings Allowance allows businesses to claim tax relief on qualifying expenditure for constructing, converting, or renovating non-residential structures and buildings.
The relief is available at a flat rate of 3% per year on qualifying expenditure, on a straight-line basis. This means relief is spread over 33 and one-third years.
The SBA applies to qualifying commercial buildings and structures, including new builds, conversions, and renovations. It does not apply to the cost of land, nor does it apply to residential property in most cases. Plant and machinery within a building should be considered separately under the plant and machinery capital allowances rules.
If you buy an existing commercial building, you may be able to claim any remaining SBA only where there is qualifying expenditure and the correct allowance statement is available from the seller. The claim is not simply based on the total purchase price of the property.
For businesses investing in new commercial premises — whether building from scratch or significantly refurbishing an existing property — the SBA can generate useful annual relief that accumulates over time. When combined with capital allowances on fixtures and fittings, the overall tax efficiency of a commercial property investment can be substantially improved with the right advice.
Alongside the AIA, Full Expensing, and the 40% First Year Allowance, there are specific 100% First Year Allowances for certain assets.
A key current example is the 100% First Year Allowance for new and unused zero-emission cars and equipment for electric vehicle charging points. These allowances have been extended to 31 March 2027 for Corporation Tax purposes and 5 April 2027 for Income Tax purposes.
This can be valuable for businesses investing in electric company vehicles or installing EV charging infrastructure. However, the rules are specific. The car must be new and unused, and cars do not qualify for AIA, Full Expensing, or the 40% First Year Allowance.
If your business is investing in sustainability — including an electric fleet or workplace charging facilities — it is worth checking whether these enhanced allowances apply, and how they sit alongside any sustainability and ESG planning you are already doing. These allowances may also sit alongside wider tax planning where a business is investing in innovation, although costs must be separated carefully. Our article on what qualifies for R&D tax credits in the UK and Ireland touches on how capital investment and R&D-related reliefs can interact on the same wider project.
Most plant and machinery used in your trade may qualify for capital allowances. This can include:
Cars are treated differently from other vehicles. The level of relief depends on the car’s CO2 emissions and whether it is new or second-hand. For cars bought from April 2021, a new and unused zero-emission car can qualify for 100% First Year Allowance. A second-hand electric car, or a new or second-hand car with CO2 emissions of 50g/km or less, goes into the main rate pool. A car with CO2 emissions above 50g/km goes into the special rate pool.
Company car tax planning and capital allowances should always be considered together, as the best tax outcome depends on both the business and personal tax position.
If your business operates in the Republic of Ireland as well as the UK, it is important to understand that Ireland has its own capital allowances regime.
In Ireland, capital allowances on plant and machinery generally take the form of wear and tear allowances, calculated at 12.5% per year on a straight-line basis. This means the full cost is usually written off over eight years. Most industrial buildings are generally relieved at 4% per year over 25 years.
Ireland also has Accelerated Capital Allowances for certain qualifying assets, including approved energy-efficient equipment, gas vehicles and refuelling equipment, and certain employee creche or gym facilities. The schemes for energy-efficient equipment and gas vehicles/refuelling equipment have been extended to 31 December 2030.
The difference in timing between UK and Irish relief can affect cash flow planning significantly, particularly for cross-border businesses making major capital investments. A well-structured cross-border tax advisory approach takes both jurisdictions into account, ensuring that capital expenditure is allocated and timed in a way that supports tax efficiency on both sides of the border. As our piece on cross-border payroll illustrates, the operational and tax complexities of running a business across the UK and Ireland can touch every area of financial planning — capital expenditure included.
Capital allowances are an area where businesses consistently leave money on the table, often for straightforward reasons.
Not identifying all qualifying assets. When fitting out premises, businesses often focus on obvious items such as furniture and IT equipment, while missing embedded fixtures and integral features that may also qualify. A proper capital allowances review of a significant property transaction can uncover substantial unclaimed relief.
Miscategorising assets between pools. Putting a special rate pool asset in the main pool, or vice versa, affects the rate of relief you receive. Getting the classification right matters.
Missing the AIA on assets that qualify. Some businesses apply Writing Down Allowances across the board without considering whether AIA would give faster relief on the same expenditure.
Overlooking the new 40% First Year Allowance. Since 1 January 2026, this allowance may be useful where AIA is not available or has already been used, particularly for certain new and unused main rate plant and machinery.
Assuming every green asset gets 100% relief. Some zero-emission cars and EV chargepoints can qualify for 100% First Year Allowances, but not every environmentally friendly asset automatically qualifies for enhanced relief.
Forgetting to review prior year expenditure. If allowances were missed in a previous year, it may still be possible to amend a tax return within the normal time limits or review whether any unclaimed pool balances remain available. Speak to an adviser sooner rather than later, as time limits apply.
For businesses where there are unexplained gaps in records or questions about how assets have been accounted for historically, a review by forensic accountants UK businesses trust can help establish the position accurately and ensure any adjustments are properly evidenced.
And if capital expenditure decisions have contributed to wider financial pressure in the business, our company recovery accountants can help you understand your options. Our article on what an insolvency accountant does in business distress cases is worth reading if you are facing that kind of pressure — the earlier you seek advice, the more routes tend to be available.
Capital allowances work best when they are part of a joined-up tax strategy rather than a standalone exercise. For businesses investing in innovation, they may interact with R&D relief and Research and Development Allowances. However, the same cost cannot simply be claimed twice, so expenditure needs to be analysed carefully.
For property-focused businesses, capital allowances may interact with Land Remediation Relief and the Structures and Buildings Allowance, as our earlier article on Land Remediation Relief explained explores in detail.
Timing also matters. The year in which you make a capital purchase affects when the relief flows through. For businesses with fluctuating profits, changing investment needs, or cross-border tax considerations, the timing of capital investment can be worth reviewing before decisions are finalised.
The digital bookkeeping systems we help clients set up make it much easier to track asset purchases in real time and ensure nothing is missed at year-end, rather than trying to reconstruct expenditure retrospectively.
Our article on the future of financial planning looks at how integrated, proactive financial planning — of which capital allowances are one important component — is becoming the norm for well-run businesses. And if you are looking to understand how tax accountants help businesses get more from their finances day to day, our article on how tax accountants help small businesses gives a broader picture.
Yes. Capital allowances are available to sole traders and partnerships as well as limited companies. The rules around AIA and Writing Down Allowances can apply to unincorporated businesses, although Full Expensing is only available to companies. The 40% First Year Allowance can also apply to qualifying expenditure by unincorporated businesses from 1 January 2026.
Where an asset is used partly for private purposes, the capital allowance claim is restricted to the business-use proportion. For sole traders using a car partly privately, this is a common area where adjustments are required.
When you dispose of an asset, there may be a balancing adjustment. This can result in a balancing allowance or a balancing charge, depending on the disposal proceeds and the value remaining in the pool. If Full Expensing or a 50% special rate First Year Allowance has been claimed, specific disposal rules can apply, so it is important to review the position before finalising the tax treatment.
Generally, capital allowances are claimed by the owner of an asset, not the lessee. If you lease equipment rather than buy it, the lease payments may be deductible as revenue expenditure instead. However, the rules can be complex, especially for finance leases, long funding leases, and assets provided for leasing.
Claims are made through your annual tax return, so they follow the normal Self Assessment or Corporation Tax filing deadlines. Missed claims from prior years may sometimes be corrected by amending a return, but time limits apply. For Corporation Tax, amendments are usually possible within two years of the end of the accounting period.
Capital allowances are one of the most reliable and consistent ways to reduce your tax bill — but only if they are claimed correctly and in full. With the variety of allowances available, including AIA, Full Expensing, the 40% First Year Allowance, Writing Down Allowances, Structures and Buildings Allowance, and specific First Year Allowances, there is a lot to navigate.
At SCC Chartered Accountants, our specialist tax team covers the full range of UK and Irish capital allowances as part of an integrated approach to tax incentive planning. Whether you are making a significant capital investment, refitting commercial premises, or simply want to make sure previous claims have been handled correctly, we can help.
Get in touch today to find out how we can help your business get the maximum benefit from its capital expenditure.
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