Capital Allowances Appeals: When HMRC Cuts Your Claim

HMRC has cut your capital allowances claim. Maybe a closure notice has landed at the end of an enquiry, striking out part of what you claimed for a refurbishment, a fit-out, or new equipment. Maybe it's a discovery assessment reopening an earlier year. Either way, the message is the same: HMRC says the spending you treated as qualifying for tax relief does not qualify—or does not qualify in the way, or at the rate, you claimed.

Here is the first thing to understand, because it explains why these disputes are the way they are. The fight is almost never about the machinery. It is about whether what you bought counts as "plant" at all—and "plant" has no full definition anywhere in the legislation.

Instead you get a century of case law, built around one deceptively simple question: is this the apparatus with which you carry on your trade, or the premises in which you carry it on? Apparatus is plant. Premises are not. Almost every capital allowances appeal lives in the space between those two ideas.

That matters for your appeal in a very practical way. Whether something is plant is treated as an evaluative question of "fact and degree", not a clean question of law. A tribunal's finding of fact is hard to overturn on a further appeal. So these cases are won—or lost—on the facts and the evidence you put in front of the First-tier Tribunal, not on a clever legal argument bolted on afterwards.

This guide explains what capital allowances are, why HMRC challenges them, the plant test at the heart of most disputes, the rates (one of which has just changed), the traps that can cost you allowances permanently, and how to appeal.

HMRC Has Reduced Your Capital Allowances—What's Happened

When your business buys something lasting—a machine, a van, shop-fittings, computers, integral parts of a building—you generally cannot just deduct the cost from your profits the way you deduct rent or wages. That spending is capital, and capital expenditure is not an ordinary business expense.

Capital allowances are the tax system's substitute. They are a separate, statutory form of relief that lets you write down qualifying capital spending against your taxable profits, either all at once or gradually over years.

The whole regime lives in the Capital Allowances Act 2001 (CAA 2001). The most important part for most businesses is plant and machinery allowances: relief for spending on plant or machinery used in a "qualifying activity"—broadly, a trade, a property business, or a profession (section 11 CAA 2001 sets the general conditions; section 15 lists the qualifying activities).

HMRC challenges these claims for a handful of recurring reasons:

• It says the asset isn't plant—it's part of the building or the structure, not apparatus used in the trade. This is the big one.
• It says the spending is a repair (a deductible revenue expense) miscast as capital, or capital miscast as a repair.
• It says you claimed the wrong allowance or rate—main pool when it should be the slower special-rate pool, or first-year relief that doesn't apply.
• It says a procedural requirement wasn't met—most painfully, the fixtures rules on a property purchase, or the allowance-statement rule for structures.

There are two kinds of business owner reading this, and the appeal route differs for each:

• Sole traders and partnerships pay income tax through Self Assessment. The dispute runs through the Taxes Management Act 1970 machinery—enquiry, closure notice, discovery, appeal.
• Companies pay corporation tax under their own self-contained code, Schedule 18 to the Finance Act 1998. The substantive capital-allowances law is identical, but the enquiry, discovery and appeal provisions are different. Our corporation tax appeals guide is the companion.

One reassurance before we go further. For most assets, a capital allowances dispute is about timing, not a permanent loss. If HMRC moves your spending from the main pool to the special-rate pool, you still get the relief—just more slowly. The genuinely permanent losses are narrower: spending that falls out of plant and machinery entirely (a building or structure with no other relief), or fixtures lost under the rules described below. Knowing which kind of dispute you have tells you how hard to fight.

The Heart Of Most Disputes: Is It "Plant"?

There is no statutory definition of "plant". The Act tells you what is excluded and what is saved, but it never says what plant is. HMRC accepts this openly in its Capital Allowances Manual at CA21010: "plant" takes its common-law meaning. So the question turns on a line of cases stretching back over a century.

The starting point is Yarmouth v France (1887), where plant was famously described as whatever apparatus a businessperson keeps for permanent employment in the business—the goods and chattels, fixed or moveable, used to carry it on, as opposed to the stock they sell. That definition still anchors everything that follows.

The crucial refinement is the premises test, and it is usually where claims fail. Something that functions as the premises in or on which the trade is carried on is not plant, even if it was purpose-built for that trade. In Carr v Sayer (1992), purpose-built permanent quarantine kennels were the premises in which the boarding trade was carried on—not apparatus with which it was carried on—so they were not plant. The label the courts use is "apparatus with which the trade is carried on, as opposed to the premises in or on which it is carried on".

Then there is a rescue for some borderline items. In Scottish & Newcastle Breweries (1982), decorative items that created the atmosphere or ambience of a hotel trade were held to be plant, because creating that ambience was part of how the trade functioned. But the line is fine: something that merely embellishes the setting and serves a trade function can be plant, whereas something that becomes part of the premises is not. In Wimpy International v Warland (1989), shop fronts, tiles, suspended ceilings and raised floors were the premises—not plant—while specially-installed atmospheric light fittings qualified.

The modern cases apply exactly this framework, and they are the ones you can read in full:

• J D Wetherspoon plc v HMRC [2012] UKUT 42 (TCC) is the leading fit-out authority. On a pub refurbishment, decorative panelling that went beyond the ordinary qualified as plant, while ordinary tiling, toilet cubicles and incidental building alterations did not. (It was decided under the older Capital Allowances Act 1990 wording, but the plant-versus-premises analysis is the standard reference.)
• Cheshire Cavity Storage 1 Ltd v HMRC [2022] EWCA Civ 305 held that large underground gas-storage cavities were the premises in which gas was stored, not plant. The Court of Appeal rejected the idea that performing any plant-like function makes something plant; it is a question of fact and degree requiring an evaluative judgement.
• Urenco Chemplants Ltd v HMRC [2022] EWCA Civ 1587 is the key authority on how the statutory carve-outs work, holding that even where an item escapes the building and structure exclusions, you must still satisfy the basic "provision of plant" condition in section 11.
• SSE Generation Ltd v HMRC [2023] UKSC 17 is the Supreme Court's contribution. On a hydro-electric scheme it was common ground that the disputed items were plant—the only fight was whether they were caught by a separate statutory exclusion (tunnels and aqueducts). The taxpayer largely won. It is a case about reading the exclusions, not about what plant is.

The Statutory Overlay: Buildings, Structures And List C

Once you have decided whether something is plant at common law, the statute adds three filters:

• Section 21 CAA 2001 excludes spending on a building—including things normally found in a building and the items in "List A" (walls, floors, ceilings, doors, windows, mains services, and so on).
• Section 22 excludes a structure or other asset in "List B" (tunnels, bridges, roads, car parks, docks and the like) and works altering land.
• Section 23 saves "List C"—a long list of items (machinery, manufacturing and display equipment, cold-water and gas systems serving the trade, computer and security systems, moveable partition walls, swimming pools, and more) that the building and structure exclusions do not strike out. For an everyday small business, the List C items that come up most often are things like refrigeration and cold rooms, burglar-alarm and CCTV systems, sanitary fittings, signs and display equipment, and moveable partitioning.

Here is the trap, and the Urenco point above is the reason: being on List C does not make something plant. List C only removes the building and structure bar. After that, you still have to prove the item is plant on common-law principles and meets section 11. "It's on List C" is the start of the argument, never the end of it.

So the full sequence the tribunal works through is: (1) Is it plant at all—apparatus used in the trade, not premises? (2) Does the building or structure exclusion catch it? (3) If so, does List C save it from that exclusion? (4) Even then, is the section 11 "provision of plant" condition satisfied? And running through all of it: this is an evaluative judgement of fact and degree, which is exactly why the evidence you build matters more than the legal label.

The Allowances And Rates

If the spending does qualify as plant and machinery, several different allowances may apply. They are not alternatives you freely pick between—each has its own conditions—but it helps to know what is on the table.

Annual Investment Allowance (AIA). This gives 100% relief in the year of purchase on up to £1,000,000 of qualifying plant and machinery (section 51A CAA 2001). It is available to sole traders, partnerships of individuals, and companies alike, and—unlike full expensing below—it covers special-rate assets too. The £1 million cap is the permanent level (it was made permanent in 2023; do not treat it as a temporary figure). Common disputes are about the date spending was "incurred" when it straddles a change, and about sharing the single cap across related businesses or a group.

Full expensing. For companies only, new and unused main-rate plant and machinery qualifies for a 100% first-year allowance, with 50% for new special-rate assets (sections 45S–45T CAA 2001). It was made permanent by the Finance Act 2024. Two cautions: it is not available to sole traders or partnerships (they use AIA), and it carries a sting—on disposal, the proceeds trigger an immediate balancing charge. In plain terms, when you later sell or scrap the asset, the sale proceeds are added straight back into your taxable profits for the year of sale, clawing back relief you have already had. AIA does not work that way.

Writing-down allowances (WDAs). Spending that is not relieved in full in year one goes into a pool and is written down a bit each year on a reducing-balance basis. There are two rates, and one of them has just changed:

• The main rate is 14% from April 2026. This is a recent cut: it was 18% before, and was reduced to 14% by section 28 of the Finance Act 2026, for chargeable periods beginning on or after 1 April 2026 (corporation tax) or 6 April 2026 (income tax). Periods beginning before that date still use 18%, and a period straddling the change uses a blended rate. Check which figure applies to the year HMRC is assessing—if the dispute is about an earlier year, the rate is 18%, not 14%.
• The special rate is 6% (section 104D CAA 2001). This applies to the special-rate pool—integral features, long-life assets, and the like. It was not changed by the Finance Act 2026.

The practical upshot for your dispute: if HMRC accepts the item is plant but moves it from the main pool to the special-rate pool, your relief drops from 14% a year to 6% a year. You still get it eventually—it is a timing fight, and worth keeping in proportion. If HMRC says it is not plant at all, and no other allowance (such as the structures allowance below) applies, the relief can be lost altogether—a much bigger deal.

Integral Features And The Special Rate Pool

A particular category of building-related spending gets relief but at the slower rate. Integral features are defined by section 33A CAA 2001 as five things: an electrical (including lighting) system; a cold-water system; a space- or water-heating system, a powered ventilation, air-cooling or air-purification system (and any floor or ceiling forming part of it); a lift, escalator or moving walkway; and external solar shading.

Integral features are special-rate expenditure, so they go into the special-rate pool and attract the 6% writing-down allowance rather than the main rate. But they do qualify for AIA (100% within the £1 million cap), and a company's 50% first-year allowance, so the slower pool rate only bites once the AIA is used up.

The common dispute here is the repair-versus-capital line in a refurbishment. Rewiring, re-plumbing or replacing a heating system can be a deductible repair in some circumstances and capital integral-feature expenditure in others. Section 33B adds a specific rule: where you spend more than half of what it would cost to replace an integral feature within a 12-month period, the law treats it as a replacement—capital, not a repair. HMRC's guidance on integral features runs from CA22300 onwards.

The Fixtures Trap—Buying A Building

This is the one that can cost a buyer their allowances permanently, and it almost always has to be fixed before you complete the purchase—long before HMRC ever writes to you.

A fixture is plant or machinery that has been installed in a building or land so as to become, in law, part of it—wiring, heating, sanitary ware, lifts, fitted kitchens in commercial premises (section 173 CAA 2001 defines it). When a commercial property changes hands, the fixtures code decides who gets the allowances on those embedded items. And since April 2014, section 187A CAA 2001 imposes two requirements before a buyer can claim:

• The pooling requirement. The seller (the past owner) must have allocated the historic fixtures expenditure to a capital allowances pool before selling—in effect, brought the fixtures into their own capital allowances computation.
• The fixed-value requirement. The figure attributed to the fixtures on the sale must be fixed, normally by a joint election under section 198 signed by buyer and seller within two years, or failing that by an application to the First-tier Tribunal within the relevant window.

If those requirements are not met, section 187A treats the buyer's qualifying expenditure on the fixtures as nil. And it is not just your loss—because the entitlement is extinguished, every future owner is locked out too.

This is why a missed step here is so damaging. If the seller never pooled the fixtures, or has since been dissolved or gone into liquidation and cannot co-operate with an election, your fixtures allowances can be gone for good—not deferred, gone. By the time HMRC reduces your claim on an enquiry, it is usually far too late to fix it: the cure had to happen in the purchase contract, through a section 198 election and proper pre-contract enquiries. If you are about to buy commercial property, this is the single most valuable thing to get right. HMRC's guidance on the change-of-ownership rules is at CA26474, CA26476 and CA26479. The same transaction may also raise SDLT and, for a let property, property income questions.

Structures And Buildings Allowance

Not everything that fails the plant test is a dead loss. Spending on the fabric of a non-residential building or structure—the parts that are not plant—may instead qualify for the Structures and Buildings Allowance (SBA) under section 270AA CAA 2001, provided construction began on or after 29 October 2018.

SBA is a flat 3% straight-line allowance, written off over 33⅓ years (10% over 10 years for qualifying spending in a special tax site). It is much slower and narrower than plant and machinery relief—there is no AIA and no balancing allowance on sale—but it plugs the gap for offices, factories and warehouses that fall outside plant.

There is a hard procedural condition you cannot afford to miss. Under section 270IA, the qualifying expenditure is treated as nil unless an allowance statement has been made before the first claim (or obtained from a previous owner). It must record the date of the construction contract, the amount of qualifying expenditure, and the date the building was first brought into use. No allowance statement, no SBA—so if HMRC has refused an SBA claim, the allowance statement is the first thing to check. HMRC's SBA guidance runs from CA90100, with the allowance-statement rule at CA94700.

How To Appeal A Capital Allowances Decision

There is no special "capital allowances appeal". Because allowances are claimed in your tax return, a dispute reaches the tribunal through the ordinary self-assessment machinery—the same route as any income tax or corporation tax dispute.

If you are a sole trader or in a partnership (income tax). HMRC opens an enquiry into your return under section 9A TMA 1970 and concludes it with a closure notice under section 28A, amending your self-assessment to reduce or refuse the claim. If the enquiry window has already closed, HMRC's only route in is a discovery assessment under section 29 TMA, which it can only make if specific conditions are met—see our guides to HMRC enquiries and closure notices and discovery assessments, and the Langham v Veltema analysis on what counts as information "made available". You appeal under section 31 TMA, in writing within 30 days of the decision (section 31A).

If you trade through a company (corporation tax). The machinery is in Schedule 18 FA 1998: an enquiry under paragraph 24, a closure notice under paragraph 32, discovery under paragraph 43 or paragraph 44, and appeal under paragraph 34(4) (against a closure-notice amendment) or paragraph 48 (against an assessment), within 30 days. Our corporation tax appeals guide walks through it.

Either way, you can ask for a free HMRC statutory review by a different officer—completed within 45 days—or notify the appeal straight to the First-tier Tribunal (Tax Chamber), where there is no fee. Our how to appeal to the tax tribunal and understanding HMRC appeal rights guides cover the mechanics.

The Burden Is On You—And Why That Shapes Everything

This is the rule that decides how to run a capital allowances appeal. On an appeal against an assessment or amendment, the burden of proof is on you, the taxpayer (section 50(6) TMA 1970). It is for you to displace HMRC's figure—which here means proving that the spending qualifies as plant, an integral feature, a fixture you are entitled to, or a structure. HMRC does not have to prove it isn't; you have to prove it is.

In a plant-versus-premises dispute, that burden is met with evidence, not assertion. The things that decide these cases are a surveyor's report, a detailed cost breakdown that separates the qualifying items from the building works, photographs, and a clear explanation of what each item actually does in your trade. Our guides to writing grounds of appeal and how to appeal to the tax tribunal explain how to build and present that case.

The Edwards v Bairstow Reality

Remember that whether something is plant is a "question of fact and degree". That has a sharp consequence on any further appeal. The First-tier Tribunal's finding of fact is very hard to overturn—the Upper Tribunal or a court will only intervene if the tribunal made an error of law: applied the wrong test, reached a conclusion with no evidence to support it, or made a finding no reasonable tribunal could have made. That is the Edwards v Bairstow error-of-law gateway, and the Cheshire Cavity line confirms that "is it plant?" is exactly the kind of evaluative finding it protects.

The lesson is simple and important: you have to win at the First-tier Tribunal. Do not treat the FTT hearing as a dry run with the real argument saved for appeal—on a question of fact and degree, there usually is no second bite. Put your full evidence in at the first hearing.

What The Tribunal Cannot Do

The First-tier Tribunal is a creature of statute. It decides whether the spending qualifies under the law—it cannot give you relief because the result feels harsh, because your accountant claimed it in good faith, or because HMRC changed its approach. "It's not fair that HMRC disallowed what we claimed" is not a ground of appeal; the ground is that the expenditure does qualify. Complaints about HMRC's conduct go to HMRC's complaints process, then the Adjudicator, then judicial review—not the tax tribunal. Our Hok v HMRC analysis explains that limit.

Interest And Penalties On A Reduced Claim

Two things can follow a reduced claim, and they are not the same. First, interest. Whenever a cut to your allowances means you underpaid tax, that underpaid tax carries interest, running automatically from the date the tax was originally due until you pay it. Interest is not a penalty and needs no fault on your part—it simply reflects that the tax was paid late—so it applies even where the disagreement was entirely reasonable.

Second, a penalty. If HMRC says your over-claim understated your tax, it may also seek an inaccuracy penalty under Schedule 24 FA 2007. But most "is it plant?" disputes are genuine characterisation differences—reasonable people, and reasonable advisers, disagreeing about where the line falls. A claim made on a reasonable basis, with professional advice, should not be "careless", and HMRC bears the burden of proving the behaviour before any penalty bites. If a penalty is in play, our guides to self-assessment penalties and reducing HMRC penalties cover the bands, disclosure reductions and suspension.

What To Do Now

1. Identify the letter and the year. Is it a closure notice ending an enquiry, or a discovery assessment reopening a closed year? Which tax year or accounting period is in dispute? The year decides the writing-down rate—18% for periods before April 2026, 14% after.
2. Work out what kind of dispute it is. A move from the main pool to the special-rate pool is a timing fight (worth keeping in proportion). A refusal that takes the spending out of allowances altogether—a building, structure, or lost fixtures—is potentially permanent, and worth fighting hardest.
3. Diary the 30-day clock. You have 30 days from the decision to appeal in writing, and it runs from the date on the letter. Miss it and you are into a late-appeal application, which the tribunal does not grant as a matter of routine.
4. Build the evidence. Because the burden is on you, gather the cost breakdown, the surveyor's or quantity surveyor's report, photographs, and a plain account of what each disputed item does in your trade. This—not legal argument—is what wins plant cases.
5. Consider a statutory review first. It is free, it doesn't cost you the tribunal, and a fresh officer sometimes resolves a clear point. See HMRC internal review.
6. Get help on the technical ones. A clear-cut item can be argued by the business owner in person. But the plant test, the fixtures rules and the structures allowance reward specialist input—a capital allowances surveyor or a tax adviser can be engaged for a single piece of work, and you can lodge the appeal yourself first to stop the clock. A tribunal appeal typically takes 6-12 months to reach a decision.

Key Legislation And Resources

Legislation

• Section 11, CAA 2001—the general conditions for plant and machinery allowances
• Sections 21–23, CAA 2001—the building exclusion, the structures exclusion, and the List C saving
• Section 33A, CAA 2001—integral features (the five-item list)
• Section 51A, CAA 2001—the Annual Investment Allowance and its £1 million cap
• Sections 45S–45T, CAA 2001—full expensing (companies only)
• Section 56, CAA 2001—the main-rate writing-down allowance (14% from April 2026; 18% before)
• Section 104D, CAA 2001—the special-rate writing-down allowance (6%)
• Sections 173, 187A and 198, CAA 2001—the fixtures code: meaning of fixture, the pooling and fixed-value requirements, and the joint election
• Sections 270AA and 270IA, CAA 2001—the Structures and Buildings Allowance and the allowance-statement requirement
• Sections 9A, 28A, 29, 31 and 31A, TMA 1970—enquiry, closure, discovery and appeal for income tax
• Section 50(6), TMA 1970—the burden of proof on the taxpayer
• Schedule 18, FA 1998—the corporation tax enquiry, discovery and appeal code

Key Cases

• SSE Generation Ltd v HMRC [2023] UKSC 17—Supreme Court on reading the List B exclusions; the disputed items were agreed to be plant
• Urenco Chemplants Ltd v HMRC [2022] EWCA Civ 1587—List C only removes the exclusions; the section 11 "provision of plant" test still applies
• Cheshire Cavity Storage 1 Ltd v HMRC [2022] EWCA Civ 305—gas-storage cavities were premises, not plant; "fact and degree" is an evaluative question
• J D Wetherspoon plc v HMRC [2012] UKUT 42 (TCC)—the leading fit-out authority; decorative panelling plant, ordinary tiling not
• Yarmouth v France (1887) 19 QBD 647—the origin of the definition: plant is apparatus kept for permanent employment in the business
• CIR v Scottish & Newcastle Breweries [1982] STC 296 (HL)—ambience and decor can be plant; something that becomes part of the premises is not
• Wimpy International v Warland [1989] STC 273 (CA)—the premises test refined: if an item functions as part of the premises it is not plant
• Carr v Sayer [1992] STC 396—apparatus with which the trade is carried on, as opposed to the premises in which it is carried on

HMRC Guidance

• Capital Allowances Manual CA21010—the meaning of "plant" (common-law, no statutory definition)
• Capital Allowances Manual CA22030—List C and the building and structure exclusions
• Capital Allowances Manual CA26476—the fixtures pooling requirement on a change of ownership
• Capital Allowances Manual CA94700—the SBA allowance-statement requirement
• Claim capital allowances—the GOV.UK overview of allowances, AIA and pools
• Check if you can claim full expensing—the company-only 100% / 50% first-year allowances

On This Site

• Corporation tax appeals—the Schedule 18 FA 1998 route for company claims
• HMRC enquiries and closure notices—the s.9A / s.28A process
• Discovery assessments—how HMRC reopens a closed year
• Langham v Veltema—what counts as information "made available" against discovery
• Edwards v Bairstow—why "is it plant?" findings are hard to overturn
• Property income appeals—the landlord's lane (fixtures and SBA overlap)
• Writing grounds of appeal—structuring your case and using the burden
• How to appeal to the tax tribunal—the filing route
• Reducing HMRC penalties and self-assessment penalties—if a penalty rides on an over-claim
• Interest on unpaid tax—what the underpaid tax accrues once a claim is reduced
• Hok v HMRC—why "it's not fair" is not a tribunal ground
• Understanding HMRC appeal rights and HMRC internal review—your options after an appealable decision

This article is for informational purposes only and does not constitute legal or tax advice. For advice specific to your situation, consult a qualified tax adviser, accountant, or solicitor.