How to Claim Capital Allowances on Commercial Property in the UK

Capital allowances are one of the strongest tax reliefs available to UK commercial property owners. Yet thousands of landlords, investors and trading businesses still pay more tax than they need to. HMRC has recently reminded businesses to review their capital allowance claims carefully, because errors, missing items and aggressive claims are all on the rise. In this guide, Apex Accountants explains how capital allowances for commercial property work, what has changed, and how buyers, sellers and long-term owners can protect and improve their tax position.

Overview of Capital Allowances on Property

Capital allowances give tax relief on qualifying capital expenditure such as plant, machinery, fixtures and parts of a commercial building.
A large part of the purchase price or build cost of a commercial property can qualify, often between 15% and 45%, and sometimes more for fit-outs and hotels.
Since April 2014, “new fixture rules” apply. If the pooling and fixed value requirements are not met on a sale, capital allowances on fixtures can be lost permanently for the buyer and all future owners.
Companies can use full expensing and the 50% first-year allowance on qualifying plant and machinery from 1 April 2023 to at least 31 March 2026. AIA at £1 million and standard writing-down allowances remain available.
CPSE.1 version 4.0 (issued in 2023) now highlights capital allowances in Section 33, which must be handled with care during property transactions
Correct structuring of contracts, clear elections and good records are crucial if you want to protect relief and avoid HMRC challenges.

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How capital allowances apply to commercial property

Capital allowances on property let a UK taxpayer deduct the cost of certain capital assets from taxable profits over time. They sit in tax legislation instead of accounting depreciation.

Commercial property capital allowances usually relate to:

Plant and machinery used in the business
Fixtures and integral features within a building
Certain structural costs via Structures and Buildings Allowance (SBA)
Qualifying expenditure in construction, refurbishment or fit-out projects

They are available to:

Individuals with commercial property businesses
Partnerships and LLPs
UK and non-UK companies within the charge to UK tax
UK investors holding commercial property and furnished holiday lets, provided the activity is taxable

Developers who construct and sell property as trading stock usually do not receive capital allowances on that development spend, because their profit is taxed in a different way.

Types of capital allowances for property

Annual Investment Allowance (AIA)

Gives 100% relief on qualifying plant and machinery expenditure up to £1 million each year.
Available to most businesses, including property investors with qualifying plant.

AIA is often used first for items like:

Heating and air-conditioning units
Security and fire safety systems
Electrical distribution equipment
Fitted commercial kitchens and bars

Writing-down allowances (WDA)

Where expenditure is not covered by AIA or full expensing, it normally goes into one of two pools:

Main pool, with an 18% annual writing-down rate
Special rate pool, with a 6% annual writing-down rate, for items such as integral features and long-life assets

Full expensing and 50% first-year allowance

For companies within corporation tax:

Full expensing gives 100% relief in year one for qualifying main-rate plant and machinery acquired between 1 April 2023 and at least 31 March 2026.
A 50% first-year allowance applies to qualifying special-rate assets over the same period.

These reliefs are particularly attractive for:

Large fit-outs of offices, retail units and warehouses
New equipment in hotels and leisure sites
Refurbishment of building services such as lighting and power

Structures and Buildings Allowance (SBA)

SBA gives a flat annual allowance for qualifying construction or renovation costs on commercial buildings:

Rate is usually 3% per year on a straight-line basis for 33 years and 4 months for most projects.
Applies to eligible costs incurred on or after 29 October 2018.

SBA normally covers structural elements and some professional fees, but not land, planning costs or items that qualify for plant and machinery allowances.

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What usually qualifies inside a commercial building

Common examples of plant, machinery and fixtures that often qualify include:

Heating, cooling and ventilation systems
Hot and cold water systems that are not domestic in nature
Electrical systems and lighting
Fire alarm, sprinkler and smoke detection systems
Security, CCTV and access control
Fitted sanitary ware in toilets and washrooms
Fitted commercial kitchens and bars
Lifts, escalators and moving walkways
Certain floor finishes in production or specialist areas

Many of these are “integral features” or fixtures that are part of the property. Correct classification is vital for the right pool and rate.

Non-qualifying items often include:

The land itself
External roads and most car parks
Standard walls, roofs and basic structure, unless covered by SBA
Items used only for business entertainment

Capital allowances during a commercial property purchase

This is where many UK owners lose relief. Since April 2012, and fully from April 2014, the rules on fixtures in second-hand property have been strict.

Two key conditions must be met on a sale of a commercial building containing fixtures:

The pooling requirement

The seller must have pooled its qualifying expenditure on fixtures in a capital allowances pool or claimed a first-year allowance before selling.
There is no fixed time limit, but pooling must occur in a period in which the seller was treated as owning the fixtures.
The seller does not have to claim writing-down allowances, but the expenditure must appear in the pool.

The fixed value requirement (Section 198 election)

The buyer and seller must agree on the part of the purchase price that relates to fixtures.
This is usually done through a joint election under section 198 of the Capital Allowances Act 2001.
The election must be made within two years of completion, or the parties may have to ask the First-tier Tribunal to set the value.

If both conditions are not met, the legislation can treat the buyer’s qualifying expenditure on fixtures as nil. That can permanently remove allowances for the buyer and all later owners.

CPSE.1 and practical steps for buyers

In most UK transactions, the buyer’s solicitor will issue CPSE.1 enquiries. The current version (4.0) places capital allowances in Section 33, which asks:

Whether the seller has claimed capital allowances
Whether expenditure has been pooled
Whether there are existing elections with previous owners
Whether the seller is willing to enter a new Section 198 election

In practice, buyers should:

Ask for detailed information about past claims and fixtures
Involve a specialist accountant early, not just the solicitor
Insist that pooling and fixed value clauses appear clearly in the contract
Obtain any SBA allowance statement where applicable

Replies to CPSE.1 are often incomplete or poorly drafted. Buyers who accept vague responses risk losing substantial tax relief.

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Capital allowances while you own, refurbish or fit out a building

Once you own a commercial property, capital allowances planning should be part of every major spend.

Good practice includes:

Reviewing every refurbishment, extension and fit-out for qualifying expenditure
Keeping a breakdown of build costs split between structure, plant, fixtures and professional fees
Using quantity surveyors and tax specialists together on complex projects, where needed
Choosing specification and design options that increase qualifying plant and machinery where appropriate
Recording dates of installation, so that you can match expenditure to the correct allowance regime

For companies, full expensing and the 50% allowance can be very attractive when planning large projects over the next few years, since they create a significant front-loaded deduction compared with standard WDAs.

Capital allowances when selling a commercial property

When you sell, capital allowances still matter. They affect both your tax position and the buyer’s.

Key points for sellers:

You should know what fixtures have been pooled and what allowances you have claimed.
You will normally want the fixture value for plant and machinery to be low, often £1 for each pool, to avoid a large balancing charge.
If you have not claimed on all fixtures, there may still be an opportunity to pool and claim before the sale, subject to commercial agreement.
For SBA, you must provide an allowance statement to the purchaser. Your SBA claims stop at sale and the buyer continues them. These claims can increase the capital gain on sale, because they reduce the base cost for CGT.

Thoughtful handling of elections, marketing materials, and CPSE replies can make the asset more attractive while still protecting your tax position.

Historic and missed claims

Many owners of commercial property now enquire about the possibility of including older expenses in a capital allowances claim.

Current practice and guidance show:

There is no absolute time bar on bringing qualifying expenditure into a pool, provided the asset still exists and still belongs to the taxpayer for qualifying purposes.
Claims must be made through tax returns, and there are time limits on amending those returns. Often, missed expenditure is introduced in the current period, and relief is taken as WDAs going forward rather than by reopening many years.
Historic purchases before the 2012 and 2014 rule changes can still give value, but the pooling and fixed value rules may restrict claims where the property has changed hands since.

HMRC and professional bodies have observed that claims are still widely undervalued, particularly for:

Older properties with partial records
Portfolios that have grown over time
Businesses that never involved capital allowances specialists at purchase or during refurbishment

Risk areas and HMRC scrutiny

Recent HMRC communications and professional commentary highlight several risk areas:

Over-reliance on rough percentage apportionments without evidence
Double claims where the same item is treated in more than one pool or regime
Claims made by buyers who have not satisfied the pooling and fixed value conditions
Poor quality Section 198 elections or missing elections
Weak records to support valuations and cost breakdowns

HMRC expects businesses to keep clear records, use realistic valuations and apply the legislation correctly. Where there is a dispute over treatment or valuation, HMRC can challenge and, in serious cases, raise penalties.

Capital allowances support from Apex Accountants

At Apex Accountants we provide a specialist capital allowances service for commercial property owners, investors and developers across the UK.

Our work typically covers:

Reviewing property purchases, both past and planned, to identify missed and future capital allowances
Analysing construction, refurbishment and fit-out projects to separate qualifying plant, fixtures and structural costs
Advising on contract wording, CPSE replies and Section 198 elections for both buyers and sellers
Liaising with surveyors, solicitors and in-house teams so that technical details, valuations and tax rules line up
Preparing detailed capital allowance computations and supporting schedules for submission with tax returns
Assessing eligibility for AIA, full expensing, 50% allowances and SBA on current and upcoming projects
Supporting businesses during HMRC enquiries, including responses, evidence gathering and technical arguments
Building internal processes for clients with property portfolios so that allowances are picked up year after year

Our aim is simple. We help you identify the tax relief that is already sitting inside your building and bring it into your tax calculations in a careful, compliant and commercially focused way.

Conclusion

Commercial property capital allowances are no longer a niche topic. They affect almost every commercial building in the UK and can be worth a significant slice of the purchase price or build cost.

In 2025-2026, the stakes are higher:

Full expensing and improved first-year allowances offer strong up-front relief for companies.
The fixtures rules mean buyers can lose relief permanently if pooling and fixed value requirements are not met.
HMRC has signalled closer attention to capital allowance claims and common errors.

For commercial property owners, the message is clear. You should treat capital allowances as a core part of every acquisition, refurbishment and sale. That means:

Checking CPSE replies and contracts with a tax lens
Recording costs and assets in enough detail to support long-term claims
Reviewing older properties for missed allowances where fixtures still exist
Taking professional advice rather than relying on rough rules of thumb

If you would like Apex Accountants to review your property portfolio or a specific transaction, we can help you assess the potential tax savings, strengthen your documentation and prepare robust claims.

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Frequently Asked Questions On Capital Allowances For Commercial Property

Can I claim capital allowances if I bought the commercial property years ago?

Often yes, as long as you still own the qualifying assets and, for fixtures in second-hand property, the pooling and fixed value rules have not shut down the claim. Relief may come through WDAs in current and future periods rather than by reopening old returns.

Do I need invoices for every item to claim capital allowances?

Detailed invoices help, but there are other ways to support a claim. Cost breakdowns, contractor summaries, valuations and surveyor reports can all be used to allocate expenditure between structure and plant. HMRC will expect any apportionment to be reasonable and backed by evidence.

Can I claim capital allowances on a rented or leased commercial building?

Yes, but usually only on the expenditure you incur yourself. For example, you may claim on your own fit-out and equipment. The landlord and tenant often have separate entitlement depending on who paid for which assets and who uses them for a qualifying activity.

What is the difference between chattels and fixtures for capital allowances?

Chattels are moveable items, such as loose furniture or equipment. Fixtures are plant and machinery that is fixed to the building. Chattels are dealt with through a just and reasonable split of the purchase price. Fixtures within a property are subject to the pooling and fixed value rules, which are much stricter.

How do capital allowances interact with capital gains tax when I sell?

Plant and machinery allowances do not usually change the gain on a property sale, although there can be balancing charges. SBA is different. Claims under SBA reduce the CGT base cost, so the gain on disposal is higher unless other reliefs apply.

What happens if the seller will not sign a Section 198 election?

This is a commercial negotiation point. Without an election, and if the new fixtures rules apply, the buyer may have to involve the Tribunal or risk a nil qualifying value. Buyers should address this early and consider price, deal structure and professional advice before exchange.

Can I use full expensing and AIA on the same commercial property project?

Yes, but you need to plan the order and allocation. Companies tend to use full expensing for qualifying main-rate plant not covered by AIA or where they want to preserve AIA for other assets. The best mix depends on the level of spend and the business structure.

Are furnished holiday lets still relevant for capital allowances?

Where a property meets the furnished holiday let conditions, there may be scope for plant and machinery allowances on fixtures and equipment. The detailed rules and wider tax treatment of FHLs are under active policy review, so professional advice is essential before relying on this area.

What records should I keep to support a capital allowances claim?

Keep purchase contracts, CPSE replies, Section 198 elections, invoices, contractor breakdowns, drawings, valuations and any SBA statements. These documents will help show what you bought, when you bought it, how much you paid and how the cost splits between plant, fixtures and structure.

When should I involve Apex Accountants in a property transaction?

The best time is before you exchange contracts or commit to a major project. Early advice means the sale contract, elections, CPSE replies and cost coding can all reflect capital allowances from the start, which reduces risk and often increases the value of your claim.