What Are Capital Allowances on Property?
Capital allowances on property let you deduct the cost of certain assets from your taxable profits. Instead of treating the full cost as a one-off expense, you spread the relief over several years or claim it immediately, depending on the type of asset.
HMRC defines capital allowances as relief for "equipment, machinery, and business vehicles" that you buy for your business [1]. For property investors, this typically means fixtures and fittings in rental properties, such as boilers, lifts, air conditioning, and security systems.
The key point is that capital allowances are not the same as repairs or maintenance. Repairs are revenue expenses you deduct in full in the year you incur them. Capital allowances apply to assets that have a longer useful life and are considered part of the property's capital cost.
If you are a landlord with a portfolio of properties, understanding capital allowances on property can reduce your tax bill significantly. However, the rules differ depending on whether you let residential or commercial property.
Residential Property: Limited Scope for Capital Allowances
For most residential landlords, capital allowances on property are very restricted. Since 2016, HMRC has taken the view that residential property is not a qualifying activity for capital allowances on plant and machinery in individual dwelling units.
You can only claim capital allowances for items used in a residential building if the building has multiple residential units, like a block of flats, and the item is used in a communal part of the building [1]. So a lift serving all flats in a block qualifies, but a boiler inside a single flat does not.
This restriction applies to buy-to-let properties, HMOs, and student housing. If you own a standard single-let residential property, you cannot claim capital allowances on fixtures like kitchens, bathrooms, or heating systems. Instead, you claim relief through the replacement of domestic items relief or through repairs and maintenance deductions.
For a full breakdown of what you can and cannot deduct, see our guide on landlord tax deductions for 2025/26.
Commercial Property: Full Capital Allowances Available
Commercial property investors have much wider access to capital allowances on property. If you let offices, shops, warehouses, or industrial units, you can claim capital allowances on qualifying plant and machinery installed in the building.
Qualifying assets include [1]:
- Heating and ventilation systems
- Air conditioning and cooling equipment
- Lifts and escalators
- Fire alarm and security systems
- Lighting systems
- Sanitary fittings and kitchen equipment
- Business vehicles used for the property business
You can also claim on certain fixtures that are integral to the building, such as electrical systems, water systems, and space or water heating systems. These are known as "integral features" and qualify for special rate allowances.
If you are considering converting a commercial property to residential use, the capital allowances position changes. You should seek specialist advice before starting any conversion project.
Structures and Buildings Allowance (SBA)
For new commercial buildings or structures, you can claim the Structures and Buildings Allowance (SBA). This gives a 3% straight-line annual allowance on the qualifying construction cost [2]. The relief applies to the cost of the building itself, not just the plant and machinery inside it.
The SBA applies to:
- New commercial buildings (offices, shops, factories)
- New structures (bridges, tunnels, car parks)
- Extensions to existing commercial buildings
The allowance is calculated on the cost of construction, excluding the cost of land. You claim 3% of the qualifying cost each year for 33 years and 4 months. This is a fixed rate and does not change with inflation or market value.
For example, if you build a new office block costing £1 million (excluding land), you can claim £30,000 per year against your rental profits for the next 33 years.
Annual Investment Allowance (AIA)
The Annual Investment Allowance (AIA) gives 100% tax relief on qualifying plant and machinery costs up to £1 million per year [1][2]. This means you can deduct the full cost of qualifying assets in the year you buy them, rather than spreading the relief over several years.
The AIA is available to most businesses, including property businesses that let commercial property. It applies to most plant and machinery, but not to cars or assets you owned before the business started.
If you spend more than £1 million on qualifying plant and machinery in a single year, the excess goes into the main pool or special rate pool, where you claim writing-down allowances at 18% or 6% per year respectively [2].
The £1 million AIA limit is temporary but has been extended several times. It is currently set at £1 million until at least 31 March 2026. Check current limits with HMRC or a specialist accountant.
Full Expensing and First-Year Allowances
From 1 April 2023, companies can claim full expensing on qualifying plant and machinery investments [1]. This means you can deduct 100% of the cost in the year of purchase, with no cap. Full expensing is available to companies only, not to sole traders or partnerships.
For special rate assets (like integral features and long-life assets), companies can claim a 50% first-year allowance [1]. This gives 50% relief in the first year, with the remaining balance going into the special rate pool.
From 1 January 2026, a 40% first-year allowance is available for qualifying plant and machinery purchased after that date [1]. This applies to both companies and unincorporated businesses.
These allowances are generous but come with specific rules. You must use the asset wholly for business purposes, and you cannot claim if you lease the asset rather than buy it outright.
Writing-Down Allowances: Main Pool and Special Rate Pool
If you cannot claim AIA or full expensing, you claim writing-down allowances (WDAs) on the value of your plant and machinery pool. The pool is a running total of all qualifying assets you own.
There are two main pools [2]:
- Main pool (18% per year): General plant and machinery, including computers, office furniture, and most equipment.
- Special rate pool (6% per year): Integral features (electrical systems, water systems, heating), long-life assets (assets expected to last 25+ years), and thermal insulation.
WDAs are calculated on the reducing balance of the pool. So if you have £10,000 in the main pool, you claim £1,800 in year one, leaving a pool value of £8,200. In year two, you claim 18% of £8,200 (£1,476), and so on.
You can only claim WDAs if you have enough taxable profits to cover them. If your profits are lower than the allowance, you can carry the unused allowance forward to future years.
How to Claim Capital Allowances on Property
To claim capital allowances on property, you must include the claim in your tax return or company tax return. For sole traders and partnerships, this is the Self Assessment tax return (SA800 or partnership return). For limited companies, it is the Company Tax Return (CT600).
You need to identify which assets qualify and calculate their cost. For a property you already own, you may need a capital allowances survey or report from a specialist surveyor. This is common when buying a commercial property where the seller has not provided a capital allowances schedule.
Claims must be made within two years of the end of the accounting period to which they relate [2]. If you miss the deadline, you lose the right to claim for that period. You can still claim for later periods if you still own the asset.
If you are unsure about what qualifies, a property accountant can help you prepare the claim and ensure it meets HMRC requirements.
Capital Allowances and Property Sales
When you sell a property on which you have claimed capital allowances, the tax treatment depends on whether you sold the asset or the property itself.
If you sell a qualifying asset separately (like a boiler or lift), you may have to pay a balancing charge. This brings the proceeds into your tax return as income, effectively clawing back some of the relief you claimed.
If you sell the property as a whole, the capital allowances are typically transferred to the buyer. The buyer can continue to claim WDAs on the pool value. This is common in commercial property transactions where the seller provides a capital allowances schedule to the buyer.
For residential property, capital allowances are rarely an issue on sale because they are so restricted. But if you own a block of flats with communal areas, you should keep records of any capital allowances claimed.
Common Mistakes and Pitfalls
Many landlords make mistakes when claiming capital allowances on property. Here are the most common ones:
- Claiming on residential fixtures: As noted, you cannot claim on fixtures inside individual dwelling units. Only communal areas in multi-unit buildings qualify.
- Confusing repairs with capital expenditure: Repairs are deductible in full. Capital expenditure must go through the capital allowances system. If you claim a capital item as a repair, HMRC may disallow it.
- Missing the two-year deadline: Claims must be made within two years of the end of the accounting period. Set a reminder to file on time.
- Not keeping proper records: You need invoices, contracts, and asset registers to support your claim. Without them, HMRC can reject the claim.
- Assuming the AIA applies to everything: The AIA has exclusions, including cars and assets bought before the business started. Check the rules before claiming.
If you are unsure about any aspect of your claim, speak to a specialist. Our team at Property Tax Partners can review your portfolio and identify missed opportunities.
Capital Allowances for Limited Companies
If you hold your property portfolio through a limited company (SPV), the capital allowances rules are broadly the same as for individuals. However, companies have access to full expensing, which individuals do not.
Full expensing allows companies to claim 100% relief on qualifying plant and machinery in the year of purchase, with no cap [1]. This is more generous than the AIA, which has a £1 million cap and applies to all businesses.
Companies also benefit from the 50% first-year allowance on special rate assets and the 40% first-year allowance from January 2026 [1].
If you are considering incorporating your property business, see our guide on buy-to-let limited companies for a full comparison of the tax implications.
Capital Allowances and Making Tax Digital (MTD)
From April 2026, Making Tax Digital for Income Tax becomes mandatory for landlords with gross property income over £50,000 [1]. This means you must keep digital records and submit quarterly updates to HMRC.
Capital allowances claims must be included in these quarterly updates. If you are not yet keeping digital records, now is the time to start. A good accounting software package can track your capital allowances pool and calculate WDAs automatically.
For more on MTD requirements, read our guide on Making Tax Digital for landlords.
When to Get Professional Advice
Capital allowances on property are complex, especially for mixed-use properties, conversions, or large portfolios. The rules change frequently, and HMRC often challenges claims that are not properly documented.
You should consider professional advice if:
- You are buying or selling a commercial property
- You own a block of flats with communal areas
- You are converting a property from commercial to residential use
- You have a large portfolio with significant capital expenditure
- You are unsure whether an asset qualifies for capital allowances
A property accountant can help you identify qualifying assets, calculate the correct allowances, and submit the claim to HMRC. They can also advise on the interaction between capital allowances and other tax reliefs, such as Section 24 interest restriction.
If you need help with your capital allowances claim, contact us for a consultation.
Frequently Asked Questions
Sources
- gov.uk: Claim capital allowances: Overview - GOV.UK
- icaew.com: Capital allowances | Tax - ICAEW.com