Capital Allowances: The Tax Relief Your Business Gets Instead of Depreciation

What qualifies, what does not, and why the line is not always where you expect it.

Every business that buys equipment, machinery, or vehicles eventually records depreciation in its accounts. Depreciation spreads the cost of an asset over its useful life so the income statement (the profit and loss account) reflects a realistic reduction in value each year. It is straightforward accounting. It is also irrelevant to HMRC.

HMRC does not accept depreciation as a tax deduction. The reason is the enduring benefit principle: capital expenditure gives a business a long-lasting asset, not just an annual expense, and so it cannot reduce trading profits in the way a monthly subscription or utility bill can. When you add back depreciation as part of the profit adjustment, you are removing accounting depreciation because HMRC replaces it with its own system.

That replacement is capital allowances.

What Capital Allowances Are

Capital allowances are HMRC’s version of depreciation. They compensate a business for the fall in value of capital assets used in the trade, at rates set by Parliament rather than chosen by the business. The framework sits within the Capital Allowances Act 2001 (CAA 2001), which sets out exactly which assets qualify and at what rates.

The mechanics are simple. Once you have calculated the tax-adjusted profit before capital allowances, you then deduct the capital allowances for the accounting period to reach the taxable trading profit:

This is the figure on which income tax is charged. The capital allowances sit at the bottom of the adjustment, after all disallowable expenditure has been added back and non-trading income has been removed.

Capital allowances are calculated at rates specified by the CAA 2001. Those rates depend on two things: the type of capital expenditure incurred, and the date the costs were incurred. This article covers the first question: which assets qualify at all. The rates, the pooling system, and the rules that can give significant upfront relief are covered in the articles that follow.

The Starting Point: Plant and Machinery

Capital allowances are most commonly claimed on plant and machinery. The term sounds industrial, but in tax law it covers a wide range of business assets, from computers and commercial ovens to moveable office partitions and decorative artwork in a restaurant.

The definition sits in sections 21 to 33A of the CAA 2001 and has been built up through decades of case law. The classic definition comes from Yarmouth v France [1887], where the court described plant as:

“…whatever apparatus is used by a businessman for carrying on his business, not his stock-in-trade which he buys or makes for sale, but all goods and chattels, fixed or moveable, live or dead, which he keeps for permanent employment in the business.”

Yarmouth v France [1887]

HMRC translates this into a working rule based on expected useful life. An asset expected to last two years or more is treated as having permanent employment in the business and qualifies as plant. An asset expected to last less than one year is treated as revenue expenditure and deducted directly as a normal business expense. Assets with a life of between one and two years fall into a grey area where the specific facts of each case determine the treatment.

The Functionality Test: Plant Versus Setting

The most important question when assessing whether an asset qualifies is this: does the asset have a function in the trade, or is it simply part of the setting in which the trade is carried on?

If the asset has a function, it qualifies as plant. If it is just the backdrop, it does not.

A practical example:

• A commercial oven in a bakery has a function. It is the means by which the business operates.
• The tiled floor the oven stands on is part of the setting. It is where the business operates.

The oven qualifies as plant. The floor does not.

This is sometimes called the functionality test, and it determines a great deal of what can and cannot be claimed. Business premises are not plant: they are the place or setting in which the trade is conducted. The assets that do things inside those premises are the plant.

What Does Not Qualify: Buildings and Structures

Two sections of the CAA 2001 set out the main exclusions.

Section 21: Buildings

Buildings and their components do not qualify as plant. Section 21 CAA 2001 specifies a list of items (known as List A) that are treated as part of the building and therefore excluded:

List A: Items treated as part of the building (Section 21 CAA 2001)

• Walls, floors, ceilings, doors, gates, shutters, windows, stairs
• Mains services and systems for water, electricity and gas
• Waste disposal systems
• Sewerage and drainage systems
• Shafts or other similar structures
• Fire safety systems

Expenditure on any of these items does not qualify for plant and machinery allowances. The reasoning is consistent with the functionality test: these items are the building itself, not assets that perform a function within it.

Section 22: Structures and Land

Section 22 CAA 2001 extends the exclusion to structures and land. A second list (known as List B) sets out items that do not qualify as plant and machinery:

List B: Items treated as structures or land (Section 22 CAA 2001)

• Tunnels, bridges, viaducts
• Pavements, roads, car parks
• Canals or basins
• Dams, reservoirs
• Docks, harbours, wharves
• Dikes and sea walls

Any works involving the physical alteration of land are also excluded under section 22. The underlying principle is the same: Parliament draws a firm line between operating assets and premises. The line does not always fall where business owners expect it to.

The Override: When Something That Looks Like a Building Qualifies Anyway

Section 23 CAA 2001 creates a set of exceptions that override sections 21 and 22. If expenditure falls into any of the following categories, the building and structure exclusions no longer apply and the item qualifies as plant:

Thermal insulation added to a business building qualifies. Personal security equipment qualifies. Software and rights to use software qualify. Integral features (the electrical systems, cold water systems, space and water heating, lifts and escalators, and external solar shading within a building) qualify under a specific set of rules we will look at in detail in the next article. And a list of 33 specific items known as List C qualifies, regardless of whether those items might otherwise look like part of the building.

List C is derived largely from case law: court decisions that have since been written into statute so that the same battles no longer need to be fought again. Three examples illustrate how it works in practice.

Moveable Partition Walls (List C, Item 13)

Walls are ordinarily part of the building and do not qualify. But where a partition wall is genuinely moveable and intended to be moved as part of carrying on the business, it qualifies as plant. The court confirmed this in Jarrold v John Good and Sons Ltd [1962], finding that moveable partitions were apparatus with which the company carried on its business. The principle is now written into section 23 CAA 2001.

The key word is genuinely moveable. A partition wall bolted permanently to the floor and ceiling is part of the building. One designed and used to reconfigure a workspace regularly is plant.

Decorative Assets in Hospitality Settings (List C, Item 14)

In CIR v Scottish and Newcastle Breweries Ltd [1982], a company spent money on wall plaques, tapestries, murals, prints, and sculptures across its pubs and restaurants. HMRC challenged the capital allowances claim, arguing the items were merely decorative and therefore part of the setting.

The court disagreed. It found that creating atmosphere and ambience was an active and important function of the trade in a hospitality business. The decorative items were therefore apparatus with which the trade was carried on, not simply the backdrop. The case outcome is now in List C.

This has a practical implication for any business where the customer experience of the physical environment is part of the service: restaurants, hotels, spas, bars, and similar trades. Expenditure on artwork or designed interiors may well qualify as plant.

Swimming Pools (List C, Item 16)

In Cooke v Beach Station Caravans Ltd [1974], a caravan park operator claimed capital allowances on the construction of two swimming pools. HMRC argued the pools were part of the setting. The court found in favour of the taxpayer, ruling that the pools were part of the means by which the trade was carried on, not simply the place in which it operated. Swimming pools are now a List C item.

The List C examples share a common thread: the court asks whether the expenditure goes to the means of carrying on the trade, or to providing the place in which the trade happens. The answer requires looking at what the business actually does, not just at what the item looks like.

Other Qualifying Expenditure

Three further categories bring in expenditure that might not immediately look like plant but qualifies under specific statutory provisions.

Alterations to a building for the purpose of installing plant and machinery qualify under section 25 CAA 2001. If reinforced flooring is needed to support heavy equipment, the cost of laying that floor qualifies as plant and machinery expenditure, even though the floor itself would not. The alteration is treated as qualifying because it is directly connected to the installation of something that does qualify.

Demolition costs qualify under section 26 CAA 2001, where the demolition is connected to the removal or installation of qualifying plant and machinery. The demolition expenditure is treated in the same pool as the plant it relates to.

Thermal insulation of a business building qualifies under section 28 CAA 2001. This applies to insulation added to an existing business property and is specifically allowable regardless of whether other parts of the building attract any capital allowances.

What This Means in Practice

The practical question for any business that has bought something is straightforward: does it pass the functionality test?

Equipment, machinery, computers, vehicles, and most items that actively do something in the business will qualify. Fixtures permanently attached to a building, structural elements, and the premises itself are much less likely to qualify as plant. But the section 23 override and List C mean the answer is not always obvious, particularly for businesses in hospitality, leisure, or any trade where the design of the physical environment is part of what customers are paying for.

Two errors to avoid:

Missing legitimate claims: businesses routinely overlook List C items, software costs, and alteration expenditure that qualifies. Those omissions result in overpaying tax.

Claiming on non-qualifying items: assets that are part of the building or setting do not qualify. Claiming them exposes the return to challenge at enquiry.

Neither error is unusual. Both are avoidable with a proper review.

Coming Up in This Series

This article covers the foundation: what capital allowances are and which assets qualify as plant and machinery.

Next in the Capital Allowances series:

• The Annual Investment Allowance (AIA) and First Year Allowances. How to claim 100% relief on qualifying expenditure in the year of purchase, and what the current limits are.
• The main rate pool and special rate pool. How writing down allowances work for assets that do not qualify for immediate full relief, and which assets go into which pool.
• Cars, private use adjustments, and short-life asset elections. The specific rules that apply when an asset is not used exclusively for business, or is expected to be sold while still in the pool.

Capital allowances are one of the most significant reliefs available. Getting them right in the year of purchase matters: you can claim earlier, or you can claim later, but the timing affects your tax bill in ways that are worth understanding before the asset is bought, not after.

Not sure what you can claim?

Zazentax reviews your capital expenditure to identify every legitimate allowance, so nothing is missed and nothing is overclaimed. Let’s talk: zazentax.com/contact

This article is for general information only. Tax rules change and individual circumstances vary. Consult a qualified tax professional before making decisions based on any information here.

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