Capital Allowances on Plant & Machinery: More Than Just an Expense

Why Equipment Purchases Are Treated Differently

When you buy a laptop, a van, or a piece of specialist machinery for your business, you might assume you simply log it as an expense and reduce your profit by that amount. In most cases, it's not quite that straightforward. HMRC classifies these purchases as capital expenditure, meaning the cost must be claimed through a system called capital allowances rather than as a day-to-day business expense.

The good news is that the UK's capital allowances rules are genuinely generous — and if you understand how they work, you can often get full tax relief in the very year you make the purchase.

What Counts as Plant and Machinery?

The term sounds industrial, but plant and machinery covers a surprisingly wide range of assets. For most freelancers and business owners, this includes:

• Computers, laptops, tablets, and smartphones used for work
• Office furniture and equipment
• Vans, cars, and other vehicles
• Tools and specialist equipment relevant to your trade
• Cameras, audio equipment, or other professional kit
• Machinery used in manufacturing or construction

It does not include land, buildings, or items you lease rather than own outright.

The Annual Investment Allowance (AIA)

The most powerful tool available is the Annual Investment Allowance (AIA). As of August 2026, the AIA limit stands at £1 million per year. This means you can deduct the full cost of qualifying plant and machinery purchases — up to £1 million — from your taxable profits in the year you buy them.

For the vast majority of sole traders and small limited companies, £1 million is more than enough to cover all equipment purchases in a given tax year. In practice, this means you can achieve 100% first-year relief on most assets without any complex calculations.

For example, if you run a limited company and spend £12,000 on new computing equipment and a work van, you can deduct the full £12,000 from your profits this year, reducing your Corporation Tax bill immediately.

Writing Down Allowances: When AIA Doesn't Apply

If you exceed the AIA limit, or if you're dealing with assets that don't qualify for AIA (such as cars, which have their own rules), you'll use Writing Down Allowances (WDAs). Assets are placed into pools and depreciated at set rates:

• Main pool (18%): Most plant and machinery, including vans
• Special rate pool (6%): Integral features, long-life assets, and certain thermal insulation
• Single asset pool: Used for cars and short-life assets

Cars have CO2-based rules: cars with zero emissions currently qualify for a 100% first-year allowance, while higher-emission vehicles are restricted to the 6% special rate pool.

Sole Traders vs Limited Companies: Does It Matter?

The capital allowances rules apply to both sole traders (via Self Assessment) and limited companies (via Corporation Tax returns). The mechanics are the same, but the tax saving differs based on your rate — a sole trader on the higher rate saves 40p per £1 of allowances claimed, while a limited company currently saves at the 25% main Corporation Tax rate (or 19% for small profits).

Practical Steps to Take Now

• Keep all receipts and invoices for equipment purchases — date of purchase matters for which tax year the allowance falls in
• Check whether a purchase qualifies before you buy — leased assets do not attract capital allowances
• Consider timing larger purchases before your accounting year end to accelerate relief
• If buying a car, check its CO2 emissions rating before purchasing, as this determines which allowance applies
• Use HMRC's Capital Allowances: first year allowances guidance or speak to an accountant for complex assets

The Bottom Line

Capital allowances exist to ensure businesses get meaningful tax relief on the real cost of staying equipped and operational. With the AIA at £1 million, most small businesses can write off equipment purchases entirely in year one — turning a significant outlay into an immediate tax saving. Don't leave that relief on the table by treating a capital purchase as a simple expense entry without understanding the rules.