Capital Allowances on Plant & Machinery

Depreciation is not deductible — capital allowances are

UK corporation tax does not recognise accounting depreciation. However you depreciate an asset under FRS 102, the charge is added back in the tax computation and replaced by capital allowances under the Capital Allowances Act 2001 (CAA 2001) — the statutory regime for relieving capital expenditure on plant and machinery. The practical consequence: every asset needs two parallel lives in your records, an accounting life (depreciation) and a tax life (pool and claim history), and both hang off the same fixed asset register line. Treat them as one and you will either over-claim, under-claim, or be unable to prove either when HMRC asks.

This guide explains the reliefs available in 2026, how the pooling system works, where the qualifying boundaries sit (plant and machinery, integral features, what does not qualify), the disposal mechanics that catch businesses out, and — because it is where CPCON adds value — why the fixed asset register and a physical inventory are the foundation a defensible claim is built on. It is an orientation, not tax advice: confirm the treatment of your own facts with your tax adviser.

Official references: gov.uk — Claim capital allowances and HMRC — permanent full expensing.

The reliefs at a glance

Summary for orientation, not tax advice — rates and conditions per HMRC policy papers. Confirm treatment for your facts with your tax adviser.

Full expensing and the 50% first-year allowance

Full expensing is the headline relief for companies. A company within the charge to corporation tax that buys new and unused main-rate plant and machinery can deduct 100% of the cost in the year the expenditure is incurred, with no upper limit. That is a powerful incentive for capital-intensive businesses, but it comes with conditions that the register has to be able to evidence: the asset must be new (not second-hand), it must be main-rate (not a special-rate or integral-feature item), and it must not be acquired for leasing.

Special-rate expenditure that would otherwise be denied full expensing has its own first-year allowance: a 50% FYA on new special-rate assets — integral features and long-life assets — with the remaining 50% added to the special rate pool and written down at 6% thereafter. Knowing which assets fall on which side of the main-rate / special-rate line is therefore not academic: it determines whether the year-one relief is 100% or 50%, and how the balance unwinds.

The Annual Investment Allowance

The Annual Investment Allowance gives 100% relief on up to £1 million of qualifying expenditure per year. Unlike full expensing, it is available to unincorporated businesses — sole traders and partnerships — as well as companies, and crucially it can cover second-hand assets and special-rate expenditure that full expensing cannot. For most businesses whose annual capital spend sits at or below the £1m cap, the AIA alone delivers full year-one relief; for companies spending more, the efficient pattern is usually full expensing for new main-rate items and the AIA targeted at the special-rate and second-hand spend that full expensing excludes. The £1m limit is apportioned for short or long accounting periods and shared across groups and related businesses — another reason asset-level dating matters.

That apportionment is a practical trap worth spelling out. Because the £1 million limit is time-apportioned, a business with a shortened accounting period gets a proportionately smaller AIA, and a group of companies under common control must share a single AIA between them rather than each claiming the full amount. Where capital expenditure straddles a rate or limit change, the date an asset is brought into use — not when it was ordered or invoiced — usually governs the allowance available. All of this turns on knowing precisely when each asset entered use and which entity holds it, which is information the register carries and the return does not.

Integral features: where relief most often hides

When a business buys or fits out a property, a large part of the expenditure is on integral features — defined in CAA 2001 as electrical and lighting systems, cold water systems, space and water heating systems, air conditioning and ventilation, lifts and escalators, and external solar shading. These qualify as plant and machinery and attract allowances, but they sit in the special rate pool (6% WDA), and they are routinely missed because the cost is wrapped inside a single building or refurbishment figure rather than itemised. Separating integral features out of property and project spend is one of the most valuable exercises in capital allowances — and it depends entirely on asset-level records that break a building down into its qualifying components rather than carrying it as one line.

• Property acquisitions. A proportion of the price paid for a commercial building represents fixtures and integral features on which allowances may be available — but only if they are identified and the relevant statutory conditions are met.
• Fit-outs and refurbishments. Project spend mixes qualifying plant, integral features and non-qualifying structural work; a register that captures the breakdown turns a single capitalised cost into a properly pooled, claimable analysis.
• What does not qualify. The building structure itself, land, and most ordinary “setting” expenditure fall outside plant and machinery — which is why the boundary, and the records that evidence it, matter so much.

The qualifying boundary: what counts as plant and machinery

Almost every dispute about a capital allowances claim comes down to one question: is the expenditure on plant and machinery at all? “Plant” is not exhaustively defined in CAA 2001 — it has been shaped by decades of case law — but the working test is whether the item is apparatus with which the business is carried on, rather than the setting or premises within which it is carried on. That distinction decides whether expenditure attracts allowances or falls outside the regime entirely.

• Generally qualifies. Machinery, equipment, tools, commercial vehicles, IT hardware, furniture, and the integral features and fixtures within a building that perform a function in the trade — these are apparatus used in the business.
• Generally does not qualify. The building structure itself, land, and most works that merely create the setting — walls, floors, doors and the fabric of the premises — fall outside plant and machinery, subject to the specific statutory inclusions for integral features and certain fixtures.
• The grey zone is where value is won. Items that perform a trade function even though they look like part of the premises — specialised flooring, feature lighting, cold rooms, process pipework — frequently qualify, but only if they are identified and the analysis is documented. A single capitalised “building works” figure hides all of it.
• Structures and buildings are a separate regime. Expenditure on the structure of commercial buildings is relieved, if at all, under the separate structures and buildings allowance rather than the plant and machinery rules — so misclassifying structure as plant, or missing plant inside structure, both distort the claim. The asset-level breakdown is what keeps the two apart.

None of this is a matter of opinion at the point of enquiry — it is a matter of evidence. A register that records each item, its function and its cost lets a tax adviser run the qualifying analysis properly; a register that carries a building or a fit-out as one undifferentiated line forces the analysis to be reconstructed, or abandoned, years later.

Cars, leasing and other special cases

Several categories sit outside the simple main-rate / special-rate picture and trip up claims that treat all plant the same:

• Cars. Cars are excluded from full expensing and the AIA, and are allocated to the main or special rate pool by reference to their CO₂ emissions, with a separate first-year allowance available for new and unused zero-emission cars. The register must capture emissions data and whether the vehicle is new, because the pool and relief follow from it.
• Assets for leasing. Full expensing and the new 40% first-year allowance generally exclude assets bought for leasing — an important carve-out for businesses that buy equipment to lease on. Whether an asset is used in the trade or held for leasing is a fact the register should record.
• Hire purchase and instalment finance. Assets acquired on hire purchase can qualify for allowances on the capital element once brought into use, even though legal title passes later — so the brought-into-use date, not the title date, is what the register needs to capture.
• Short-life assets. Electing to treat an asset as a short-life asset puts it in its own single-asset pool, so that a disposal within the relevant period produces a balancing allowance rather than leaving residual value to unwind slowly in the main pool. The election only works if the asset is individually tracked — exactly what a tagged register provides.
• Private use. Assets with an element of private use (common in unincorporated businesses) sit in single-asset pools with the allowance restricted to the business proportion — again, individual tracking is unavoidable.

Pooling and writing down allowances

Expenditure that is not fully relieved by a first-year allowance is allocated to a pool and written down on a reducing-balance basis each year. The pool an asset sits in decides the rate of relief and how its eventual disposal is handled, so the register must record it explicitly.

Reducing-balance pooling means relief on anything left in a pool unwinds slowly — and from April 2026 the main pool unwinds more slowly still, at 14% rather than 18%. That makes two things more valuable than ever: claiming first-year reliefs correctly so less expenditure ever reaches the pool, and processing disposals promptly so dead assets stop occupying pool balances they should have left.

What is new for 2026

• 40% first-year allowance from 1 January 2026. A new FYA gives a 40% first-year deduction on qualifying main-rate expenditure where full expensing or AIA are not in point, with exclusions (notably assets for leasing). It softens the impact of the WDA cut for businesses investing beyond their AIA capacity, or on assets that fall outside full expensing.
• Main rate WDA falls from 18% to 14% in April 2026. Pooled balances will unwind more slowly, so relief left in the main pool becomes measurably less valuable. Claims classified correctly up front — and disposals processed promptly so dead assets stop occupying the pool — matter more than they did.
• AIA stays at £1 million; full expensing stays permanent. The first-year reliefs continue to do the heavy lifting for most capital programmes, which is why correctly identifying every qualifying asset in the year of spend is where the value is won or lost.

Disposals, balancing charges and balancing allowances

Allowances are not the end of the story — what happens when an asset leaves is just as important to the tax position, and it is where poor records do the most damage.

• Disposal value. When an asset is sold, scrapped or otherwise disposed of, a disposal value (broadly the proceeds, capped at original cost in many cases) is brought into the computation. For assets relieved by full expensing the disposal value is generally 100% of proceeds, taxed as a balancing charge.
• Balancing charge. If disposal value exceeds the pool’s remaining unrelieved balance, the excess is a balancing charge — taxable income that claws back relief previously given.
• Balancing allowance. In single-asset pools (for example short-life assets elected in, or assets with private use), a final disposal can produce a balancing allowance — extra relief where the asset was disposed of for less than its written-down value.
• Why the register decides the answer. Every one of these outcomes depends on knowing, per asset, what was claimed, which pool it sat in, when it left and for how much. A register that processes disposals only in aggregate at the ledger level cannot compute them correctly — and a register full of assets that were scrapped years ago but never derecognised overstates the pools and stores up balancing-charge surprises.
• Transfers are not disposals — but look like them. An asset moved between group companies or sites is not a sale to the outside world, yet a poorly maintained register often records it as a disposal, or loses it entirely. The connected-party rules that govern such transfers can only be applied if the movement is recorded as what it actually is, with the date and the receiving entity captured.

Timing, the claim cycle and enquiry windows

Capital allowances are claimed in the corporation tax return for the accounting period in which the qualifying conditions are met — but the relief is not always best taken in full at the first opportunity. How and when a claim is made is itself a planning decision, and one that depends on having the asset facts to hand.

• Allowances can be tailored to the position. First-year allowances and writing down allowances do not all have to be claimed to the maximum in a loss-making or low-profit year; relief can be sequenced so it lands where it is most valuable. That flexibility is only usable if the underlying asset data supports a clean, asset-by-asset claim.
• Property transactions have their own timing traps. On the purchase of a second-hand commercial property, the availability of allowances on fixtures can depend on steps taken at the point of sale between buyer and seller. Missing the window can lose the relief permanently — which is why the fixtures position is best established with proper records, not revisited years later.
• Enquiry windows close, but records must outlive them. HMRC can enquire into a return for a defined period after it is filed, and longer where a discovery is made. The asset records behind a claim should be retained well beyond the accounting period itself, because a balancing charge on a disposal years later still depends on the original claim history.
• Group and connected-party rules. Transfers of assets between connected companies, and the sharing of the AIA across a group, both turn on identifying which entity holds which asset and when it moved — facts that live in the register, not the return.

In every one of these situations the limiting factor is not tax knowledge — advisers have that — but asset evidence. A claim that can be supported asset by asset is a claim that can be optimised, defended and carried through to the disposal years without nasty surprises.

Where claims go wrong — and where the money hides

Capital allowances disputes are rarely about tax law; they are about asset facts. The recurring failure modes we see in fixed asset data:

• Ghost assets in the pools. Assets scrapped years ago, never processed as disposals — overstating pools and storing up balancing-charge surprises.
• Unclaimed qualifying spend. Capital items buried in repairs or project codes, integral features never separated from buildings spend, components misclassified into the wrong pool or written off as non-qualifying.
• No brought-into-use evidence. First-year reliefs hinge on dates and condition (new and unused) that nobody recorded at the time the asset arrived.
• Disposals without proceeds tracking. Full expensing makes disposal values taxable — registers that do not capture proceeds per asset cannot compute the charge correctly.
• Wrong-pool allocation. Special-rate assets claimed as main-rate (or vice versa), distorting both the relief rate and every subsequent disposal calculation.

All five are register problems before they are tax problems. A physical verification reconciled to the ledger establishes which assets exist, when they arrived and what left — giving your tax adviser a defensible base and frequently surfacing unclaimed expenditure in the process. Tagging then keeps the evidence current, asset by asset, so the next claim and the next enquiry are answered from live records rather than a year-end reconstruction.

How a physical inventory sustains a claim — in sequence

It is worth setting out concretely how an asset inventory turns into a defensible claim, because the value of the physical work is easy to underestimate until the steps are laid out:

1. Count and tag what exists. A wall-to-wall verification records every asset actually present, with a durable tag and a unique number — establishing the population the claim can legitimately cover and removing the ghosts that would otherwise sit in the pools.
2. Capture the qualifying attributes. For each asset: description and function, acquisition and brought-into-use dates, new-or-second-hand status, and an asset-class allocation that distinguishes main-rate plant, special-rate assets and integral features.
3. Break down bundled costs. Buildings, fit-outs and projects are decomposed into their qualifying components, so integral features and embedded plant are separated out of a single capitalised figure rather than lost inside it.
4. Reconcile to the ledger. The physical findings are matched to the fixed asset register and the nominal ledger, producing a documented schedule of ghosts to write off and unrecorded additions to bring on — the very items that most often hide unclaimed relief.
5. Hand the adviser a tested base. The tax adviser receives confirmed existence, dates, classification, pool allocation and a clean disposal trail — and can run the qualifying analysis and the computation on data that will hold up under enquiry rather than on an unverified ledger extract.

The outcome is twofold: relief is maximised, because qualifying expenditure that was buried or misclassified surfaces in the count; and the claim is defensible, because every figure traces back to an asset that was physically confirmed.

How the register sustains the claim

A capital allowances claim is, at bottom, an assertion about a population of assets: that they exist, that they qualify, that they were brought into use on stated dates, that they sit in the right pools, and that disposals have been accounted for. The fixed asset register is the document that holds every one of those facts — which is why a register reconciled to a physical inventory is the single best piece of preparation for both maximising relief and surviving an enquiry. The same physical count that supports the claim also supports the FRS 102 disclosures and the insurance position, so the work is done once and used three ways. Where a large share of the estate is IT equipment, an IT asset inventory reconciles the same count to the CMDB, and where stock sits alongside fixed assets, independent stocktaking services apply the same discipline to inventory.

How CPCON supports capital allowances work

CPCON is not a tax adviser and does not prepare computations. What we do — across 30+ years and 4,500+ projects reconciling the physical, the logical and the accounting view of an estate — is build the asset evidence the computation stands on: verified existence, acquisition and brought-into-use dates, classification by asset class and pool, component and integral-feature breakdowns, and disposal trails with proceeds. Finance teams hand that data to their advisers; advisers stop qualifying their work on data they cannot see; and HMRC enquiries are answered from records that were built to be tested.