Capital Allowances Explained: How to Claim Tax Relief on Business Equipment
Buying tools, machinery or office equipment changes your tax bill, but only if it is claimed correctly. Here is how capital allowances work, what the annual investment allowance covers, and where owners lose relief.
Capital allowances let your business deduct the cost of equipment, tools, machinery and fixtures from your taxable profit, so you pay less tax on money you have reinvested. Most purchases qualify for the annual investment allowance, which lets you claim the full cost in the year you buy rather than spreading it out. The rules on what counts as equipment, what counts as a repair, and how cars are treated separately are where owners lose relief.
The short version
Capital allowances cover assets you keep and use in the business, not day to day running costs.
The annual investment allowance is £1 million per accounting period, so almost every small business can deduct the full cost of a qualifying purchase straight away.
Cars are treated differently and never qualify for the annual investment allowance, so they follow the writing down allowance rules based on emissions.
Repairs are not capital. Fixing something you already own is usually an ordinary expense instead.
What are capital allowances?
When you buy something for your business, the treatment depends on whether it is a running cost or an asset you keep and use over time. Running costs such as stock, fuel and insurance come straight off your profit as ordinary expenses. Assets you keep, such as a van, a machine or the fit out of a workshop, are capital, and you claim relief through capital allowances instead.
The distinction matters because you cannot put a new machine through as an expense. The GOV.UK guidance on claiming capital allowances sets out the categories. The general term is plant and machinery, which is broader than it sounds, covering tools, computers, office furniture, commercial vehicles and integral features such as heating and wiring.
For most small businesses the practical effect is that a well timed purchase reduces this year’s tax bill by the full cost of the asset. Getting the categories right is part of the year end work our accounting service handles, because the difference between a repair and an improvement changes the figures on your return.
How does the annual investment allowance work?
The annual investment allowance, usually shortened to AIA, does the heavy lifting for smaller businesses. It lets you deduct the full value of a qualifying item from your profits before tax in the period you bought it, rather than claiming a percentage each year. As the GOV.UK guidance on the annual investment allowance confirms, it is currently set at £1 million for each accounting period, far more than most small businesses will spend on equipment in a year.
That generous limit is why the AIA feels almost invisible in practice. Buy a machine or kit out a new office and the whole cost usually comes off your taxable profit in one go. There are a few traps. The allowance is per accounting period, so a shorter period is scaled down proportionately, and connected companies under the same control share a single allowance rather than getting one each.
| Type of spending | How the relief usually works |
| Tools, computers, machinery | Annual investment allowance, full cost deducted in the year of purchase |
| Office furniture and shelving | Annual investment allowance, treated as plant and machinery |
| Vans and commercial vehicles | Annual investment allowance, because they are not classed as cars |
| Cars | Excluded from the AIA, relieved through writing down allowances based on CO2 emissions |
| Repairs to existing assets | Usually an ordinary running cost, deducted as a normal expense |
General treatment for UK businesses. Your own position depends on your accounting period and how the asset is used.
What can you actually claim on?
The qualifying list is wider than most owners assume. Anything you buy to keep and use in the business is a candidate, from a laptop and power tools to a commercial coffee machine or a security system. Second hand items qualify just as readily as new ones.
There are clear exclusions. You cannot claim the annual investment allowance on a car, on items you already owned personally before bringing them into the business, or on anything you were given. Buildings and land sit outside the plant and machinery rules, although fixtures within a building such as wiring and heating often do not. If you use an asset partly for private purposes as a sole trader, you reduce the claim by the private proportion.
Buying under hire purchase does not stop you claiming. Once you start using the item you can claim for the capital payments due under the whole contract, though not the interest, which is treated as a finance cost instead.
How do you time a purchase around your year end?
Timing is the part owners find genuinely useful, because a purchase a week either side of your accounting date lands in a different tax year. The date that counts is normally the date you signed the contract, provided payment falls due within four months. If payment is not due for longer than that, the relevant date becomes the date the payment falls due.
1Confirm your accounting period end
Sole traders usually run to 5 April or 31 March. Limited companies often have a year end tied to incorporation, so check the exact date first.
2Work out where your profit will land
Strong profits this year make bringing a purchase forward worth more. A quiet year may mean deferring it.
3Check the asset qualifies
A van qualifies, a car does not. Confirm the category before assuming the full cost comes off.
4Keep the invoice and contract date
The paperwork proves which period the spending belongs in.
None of this means buying equipment you do not need. Spending money to save tax only makes sense when the asset earns its place in the business. Where a purchase is already planned, though, choosing the right side of the year end costs nothing, and it is what our taxation team is asked about most in the weeks before a year end.
Sole traders and limited companies claim differently
The allowances work in much the same way whichever structure you use, but the benefit lands in a different place. A sole trader or partner claims against trading profit, reducing the income tax and Class 4 National Insurance due through Self Assessment. A limited company claims against taxable profit, reducing its corporation tax bill for the period. One further point for partnerships: the annual investment allowance is only available where every member is an individual, so a partnership with a company as a member cannot use it. Our business support service can talk through how that sits alongside everything else.
Common mistakes that cost businesses relief
Watch out for these
Treating a car as ordinary equipment. Cars are specifically excluded from the annual investment allowance and follow the emissions based writing down rules instead.
Putting a significant improvement through as a repair. Replacing a worn part is a repair, upgrading to something better is usually capital.
Forgetting to reduce the claim for private use. Sole traders must apportion an asset used partly outside the business.
Missing integral features when fitting out premises. Wiring, heating and lighting often qualify and get overlooked.
Losing the paperwork. Without the invoice and contract date you cannot evidence which period the claim belongs in.
Most of these are avoidable with a short conversation before the purchase rather than a scramble afterwards. Keep tidy digital records as you go and the claim almost writes itself at the year end, which is what our bookkeeping team in Widnes sets up for clients.
Frequently Asked Questions
Can I claim capital allowances on a van?
Yes. Vans and most commercial vehicles are not classed as cars for capital allowances, so they normally qualify for the annual investment allowance and the full cost can come off your taxable profit in the year of purchase. Pick up trucks and dual purpose vehicles can be less clear cut, so it is worth checking the specific vehicle with us before you commit.
Why are cars treated differently?
Cars are specifically excluded from the annual investment allowance. Instead you claim writing down allowances, and the rate depends on the vehicle’s CO2 emissions, with the lowest emitting cars attracting the most generous treatment. It means relief on a car is spread over several years rather than given all at once.
What is the difference between a repair and a capital improvement?
A repair puts something back to the condition it was in, and comes off your profit as an ordinary running cost. An improvement makes the asset better or different than before, and is treated as capital. Replacing a broken part like for like is a repair. Upgrading the whole system to a higher specification usually is not.
Do I have to claim the full cost in one year?
No. If claiming the whole amount would waste relief, for example because your profits are low, you can claim part as annual investment allowance and carry the rest into the writing down pool for future years. Speak to us for advice tailored to your situation.
Can FD Accountants review what we have claimed?
Yes. We regularly look back over recent years for businesses across Widnes and Cheshire and find equipment, fixtures and integral features that were never claimed. Get in touch for a free initial consultation and we will tell you honestly whether there is anything worth revisiting.
Making the most of what you have already bought
Capital allowances reward you for investing in your own business, and they are more generous than most owners realise. The work is in categorising spending correctly and keeping the evidence. If you have bought equipment recently and are not certain it has been treated properly, talk to FD Accountants and we will go through it in plain English.
Straightforward Accounting. Real Support.
We help sole traders and limited companies across Widnes claim the relief they are entitled to on the equipment that keeps their business running.