AIA Capital Allowance for Property Landlords: Disposal, Balancing Charges and the Claim Process

Most guides to the Annual Investment Allowance stop once they have told you what it is and whether you can claim it. The harder questions come later: what happens to the relief when you sell the asset, or sell the property that carries the fixtures you claimed on, and how do you actually make and stand behind the claim if HMRC asks. This page assumes you have claimed (or are about to claim) the AIA on plant in a property business, and works through the exit and the claim process those introductory pages leave thin.

The short version of the setup is this. The AIA gives a 100% deduction on qualifying plant and machinery, up to a permanent £1,000,000 a year (CAA 2001 s.51A(5), made permanent from 1 April 2023 by Finance (No. 2) Act 2023 s.8). For the definitional picture and the full treatment of the cap, see our guide to the Annual Investment Allowance and the £1m permanent cap; for whether a residential landlord can claim at all, see who can actually claim the AIA on property. From here we take the claim as read and look at disposal and process.

Who can claim, and the s.35 dwelling-house bar in brief

Whether you can claim capital allowances on an investment property turns almost entirely on one rule. CAA 2001 s.35 states that expenditure on plant or machinery for use in a dwelling-house is not qualifying expenditure for a property business. That single sentence removes the boiler, the fitted kitchen, the bathroom suite and the furnishings inside an ordinary let dwelling from any capital-allowances claim, whether you hold the property personally or through a company.

The carve-outs matter because they define where the AIA, and therefore everything on this page, actually applies:

• Communal common parts of a multi-let block or a house in multiple occupation. A boiler, lift or lighting system serving the shared areas is not in any single dwelling-house, so it is not caught by s.35.
• Integral features and plant in non-dwelling areas (CAA 2001 s.33A). Heating, air conditioning, lifts and electrical systems in commercial or mixed-use commercial space qualify.
• Mixed-use buildings, apportioned between the dwelling part (barred) and the commercial part (claimable).

If you are still working out whether you have a claim at all, resolve that on the landlord eligibility guide first. The rest of this page is for landlords and property companies whose plant is genuinely on the right side of the s.35 line, typically in commercial or communal areas.

What happens when you sell an asset you claimed AIA on

The AIA is generous on the way in: a 100% deduction in year one. The discipline comes on the way out. When you dispose of plant on which you claimed allowances, you must bring a disposal value into the relevant pool. That disposal value reduces the pool's available qualifying expenditure, and because the AIA already wrote the asset down to nil, the pool often has little or nothing left to absorb it.

Entitlement is computed per pool. CAA 2001 s.55 sets writing-down allowances and balancing adjustments by comparing the pool's available qualifying expenditure (AQE) against its total disposal receipts (TDR). A disposal does not remove a specific asset's residual value in isolation; it feeds a disposal value into the pooled arithmetic. The amount you bring in depends on how the asset leaves your hands, and s.61 sets that out event by event.

Disposal event	Disposal value brought into the pool (CAA 2001 s.61)
Normal sale	Net sale proceeds, plus any insurance money or other compensation received
Sale below market value (for example to a connected party)	Open-market value at the time of sale
Demolition or destruction	Net amount received for the remains, plus insurance money and compensation
Permanent loss of the plant	Insurance money and any capital compensation received
Plant begins to be used for a non-qualifying purpose (for example private use)	Open-market value at that time
Property sold with fixtures you claimed on	The amount apportioned to the fixtures (see the s.196 Table below)
Any other event	Open-market value at the time of the event

For the full computation of how these disposal values flow through to balancing adjustments across all your pools, see our companion guide on balancing allowances and balancing charges on disposal. The section below covers the part that catches AIA claimants out.

Balancing charge or balancing allowance: which you actually face

The two outcomes pull in opposite directions, and which one you get depends on a single comparison.

Situation	Comparison	Result
Disposal value exceeds the pool balance	TDR greater than AQE	Balancing charge: a taxable receipt added to your profits
Pool balance exceeds disposal value, activity continuing	AQE greater than TDR (not the final period)	No balancing event; the excess continues as writing-down allowances (14% main pool, 6% special rate)
Pool balance exceeds disposal value, activity ceasing	AQE greater than TDR in the final chargeable period (s.65)	Balancing allowance: an extra deduction

The trap for AIA claimants is the top row. Because the AIA wrote the asset off in full, the pool carries little qualifying expenditure to set against the disposal value, so a sale is far more likely to throw up a balancing charge than it would if you had only ever claimed writing-down allowances. The charge effectively claws back relief HMRC considers you no longer should have, because you have realised value on the asset.

To make it concrete: a portfolio landlord we advised sold a commercial unit on which the company had claimed the AIA on a new heating and ventilation system a few years earlier. The fixtures had been written down to nil by the original claim. On sale, part of the price had to be apportioned to those fixtures as a disposal value, and because there was no remaining pool balance to absorb it, the apportioned amount surfaced as a balancing charge, taxable in the year of sale. The relief was not lost overall, but the timing of the clawback caught the seller off guard and needed to be planned for, not discovered after completion.

Selling a property that carries claimed fixtures: the s.196 Table and the s.198 election

When you sell a property whose fixtures you claimed allowances on, the sale price has to be apportioned so that a value attaches to the fixtures. Two provisions govern this, one on each side of the transaction.

On the seller side, the disposal value you bring into your pool follows the fixtures disposal-value rules in CAA 2001 s.196. This is what drives your balancing charge. On the buyer side, the new owner's ability to claim on those same fixtures is gated by a joint election under s.198, fixing the amount that passes between you, made in writing and usually within two years of the sale (the time limit sits in s.201). The figure in that election is not a formality: it sets your disposal value and the buyer's qualifying expenditure simultaneously, so it directly affects your balancing charge.

This only bites on commercial and mixed-use property. The s.35 dwelling-house bar means fixtures inside a let dwelling were never claimable, so there is nothing to apportion on a residential sale. For the buyer-side mechanics, including the fixed-value and pooling gates that decide whether a buyer can claim at all, see our guide to claiming commercial property fixtures and the s.198 election on purchase. The practical takeaway for a seller is to settle the apportionment in the contract, because leaving it open hands the buyer an incentive to argue for a figure that maximises their pool and your balancing charge.

How to make the AIA claim: a step-by-step process

The claim itself is mechanical once the eligibility question is settled, but each step has a trap that an enquiry tends to find.

1. Confirm the spend is qualifying plant and machinery. The expenditure must be on plant or machinery used in a qualifying activity and must clear the s.35 dwelling-house bar. Communal and commercial plant qualifies; plant inside a let dwelling does not.
2. Fix the date the expenditure is incurred. Capital allowances follow the chargeable period in which the obligation to pay becomes unconditional, subject to the four-month rule where the amount is not actually due until later. The AIA is claimed in that period, not when you happen to pay.
3. Pro-rate the cap for a short accounting period. The £1,000,000 cap is for a 12-month period. A nine-month period gives 9/12 x £1,000,000 = £750,000.
4. Allocate the single allowance across a partnership or group. A partnership has one allowance shared across the partners; related companies under common control (CAA 2001 s.51E) share a single allowance between them.
5. Enter the claim on the return and keep the records. Claim on the capital-allowances pages of the self-assessment return or the CT600, and retain the invoices and bringing-into-use evidence digitally.

You can claim less than the full available allowance if it suits you, for example to preserve relief for a year when profits are higher. The AIA is an annual choice, not an obligation, and unclaimed amounts in a period are simply written down through the pools instead.

Hire purchase versus leasing: when the timing of the claim differs

How you finance the plant decides whether, and when, you can claim. The AIA is available on plant bought outright, on a loan, or under a hire-purchase agreement. Under hire purchase, CAA 2001 s.67 treats you as the owner of the plant for capital-allowances purposes once it is brought into use, even though legal title only passes with the final instalment. So you can claim the AIA on the capital cost when the asset is in use, not when the last payment clears. The interest element is a revenue expense, not part of the qualifying capital expenditure.

Leasing is different. If you lease plant, you never become its owner, so there is no qualifying capital expenditure for you to claim allowances on. The lessor owns the plant and any allowances belong to them. The distinction matters because lease and hire-purchase agreements can look similar commercially: it is the transfer of ownership, deemed under s.67 for hire purchase, that unlocks the claim.

When AIA runs out: the 40% first-year allowance, full expensing and writing-down allowances

Above the £1,000,000 cap, or for spend that does not suit a full first-year write-off, the relief diverges sharply by who you are and what the asset is. Three points are worth fixing clearly, because the rules changed for 2026.

The 40% first-year allowance is the headline change. Finance Act 2026 s.29 inserted CAA 2001 s.45U to define the qualifying expenditure, and set the 40% rate in the s.52 first-year-allowance table (s.29(5)). It applies to new and unused main-rate plant on expenditure incurred on or after 1 January 2026, and crucially it is not restricted by incorporation status, so an unincorporated landlord can use it on qualifying non-dwelling plant. Full expensing (CAA 2001 s.45S) is a separate, uncapped 100% first-year allowance, but it is company-only; the matching 50% allowance for special-rate plant is s.45T. Both first-year allowances require the plant to be new and unused and both exclude cars. Whatever is not relieved by the AIA or a first-year allowance goes into the pools: the main pool now attracts a 14% writing-down allowance (Finance Act 2026 s.28, substituting 14% into CAA 2001 s.56(1)), and the special-rate pool stays at 6% (s.104D).

Relief	Rate	Who can claim	Asset condition	Statute
Annual Investment Allowance	100% up to £1,000,000	Any qualifying business (sole trader, partnership, company)	New or used qualifying plant and machinery	CAA 2001 s.51A
40% first-year allowance	40%	Any business (not incorporation-restricted)	New and unused main-rate plant, from 1 Jan 2026; cars excluded	CAA 2001 s.45U; rate in s.52 table (FA 2026 s.29)
Full expensing	100%	Companies only	New and unused main-rate plant	CAA 2001 s.45S (50% special rate: s.45T)
Main-pool writing-down allowance	14% reducing balance	Any business	Spend above the cap or not on a first-year allowance	CAA 2001 s.56 (14% from FA 2026 s.28)
Special-rate writing-down allowance	6% reducing balance	Any business	Integral features and long-life assets	CAA 2001 s.104D

One AIA advantage survives that the first-year allowances do not share: the AIA can be claimed on second-hand plant, whereas both the 40% first-year allowance and full expensing require the plant to be new and unused. If you are buying used commercial plant, the AIA is often the only 100% route open to you, which is another reason to plan the cap carefully across periods.

Partnerships and groups: how the single £1m is shared

The £1,000,000 is not multiplied by the number of people or companies involved. For a partnership, there is a single partnership allowance for the period, allocated across the partners by reference to their profit shares. It is not £1,000,000 each. HMRC has confirmed the allocation approach for partnerships, and the cap is the permanent £1 million, not the date-bounded figure older guidance quotes.

For companies, the position is the trap. Where two or more companies are under common control and related to each other (CAA 2001 s.51E, using a shared-premises or similar-activities test), they share a single £1,000,000 allowance between them. Landlords who hold property through several special purpose vehicles under common ownership cannot assume each one has its own cap. Splitting a portfolio across companies does not multiply the allowance, and assuming it does is an expensive and common error. If you are weighing up a corporate structure, our complete guide to buy-to-let limited companies covers how the company route interacts with these reliefs.

Cars: excluded from both the AIA and the 40% first-year allowance

Cars sit outside the main capital-allowances reliefs, and the rule is cleaner than it is often described. A car is excluded from the AIA by General Exclusion 2 in CAA 2001 s.38B, and it is also excluded from the 40% first-year allowance. The only first-year allowance available on a car is the 100% allowance for a new and unused zero-emission (0 g/km) car under s.45D.

Every other car goes into the pools by its emissions: a car of 50 g/km or less enters the main pool at 14%, and a car above 50 g/km enters the special-rate pool at 6%. There is no half-measure where a business car "may qualify for writing-down allowances" through the AIA, the AIA simply does not apply to cars at all. Vans, lorries and similar commercial vehicles are not cars for this purpose and can qualify for the AIA in the ordinary way.

Record-keeping and defending an AIA claim on enquiry

The angle most guides skip is what happens if HMRC opens an enquiry into the claim, which is where the AIA most often comes unstuck. A 100% deduction in a single year is exactly the kind of figure that draws a question, and the documentation either carries the claim or it does not. Hold the following:

• The purchase invoice and evidence of how the plant was financed (outright, loan, or hire purchase under s.67).
• Evidence of the date the plant was brought into use, which fixes the period of the claim.
• A clear qualifying-activity link, showing the plant is used in the property business.
• s.35 carve-out evidence where the bar is in play: that the plant sits in communal common parts or a commercial area rather than inside a dwelling. This is the single point an enquiry into a landlord claim probes hardest.
• On any property sale, the s.196 apportionment and any s.198 election, so the disposal value and balancing charge are defensible.

Digital records kept for Making Tax Digital for Income Tax support exactly this kind of evidence trail. With the regime now live for landlords with gross property income over £50,000 from April 2026 (dropping to £30,000 from April 2027 and £20,000 from April 2028), the quarterly digital record-keeping discipline doubles as your enquiry defence. Our guide to Making Tax Digital for landlords sets out the record-keeping requirements in full.

In one enquiry we supported, the entire claim turned on whether a communal heating system served the dwellings or the common parts of a block. The contemporaneous installation drawings and the service contract, kept alongside the invoice, settled it in the landlord's favour without the matter escalating. The lesson is that the evidence has to exist at the time of the claim, not be reconstructed when the question arrives.

Where this page sits

This guide deliberately covers the back half of the AIA story: the disposal mechanics, the balancing charge that the 100% up-front deduction sets up, and the step-by-step claim and enquiry-defence process. For the definitional questions, what the AIA is and how the £1 million permanent cap works, see our Annual Investment Allowance guide; for the eligibility question, whether a residential landlord can claim at all under s.35, see who can claim the AIA on property. Read together, the three give the full picture from first claim to final disposal.

Sources

1. legislation.gov.uk: CAA 2001 s.35 - dwelling-house exclusion
2. legislation.gov.uk: CAA 2001 s.38B - general exclusions (cars)
3. legislation.gov.uk: CAA 2001 s.51A - Annual Investment Allowance (£1,000,000)
4. legislation.gov.uk: CAA 2001 s.55 - writing-down and balancing adjustments (AQE and TDR)
5. legislation.gov.uk: CAA 2001 s.56 - main-pool writing-down allowance (14%, FA 2026 s.28)
6. legislation.gov.uk: CAA 2001 s.61 - disposal events and disposal values
7. legislation.gov.uk: CAA 2001 s.67 - hire purchase and deemed ownership
8. legislation.gov.uk: CAA 2001 s.196 - fixtures disposal-value Table
9. gov.uk: Claim capital allowances: Annual investment allowance - GOV.UK
10. icaew.com: HMRC clarifies capital allowances rules for partnerships - ICAEW