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Businesses that need plant and machinery often buy it before their accounting year end, because capital allowances, including the Annual Investment Allowance, can set the cost against that year's profits rather than next year's. Used machinery bought at auction can generally qualify for the Annual Investment Allowance, and the timing of the purchase decides which year gets the deduction. This guide is general information, not tax advice: the rules have conditions and exceptions, so agree the position with your accountant before you bid.
Why does machinery buying cluster before year end?
Because timing moves the tax relief. Capital allowances let a business set the cost of plant and machinery against taxable profits, and the purchase falls into the accounting year in which the expenditure is incurred. A machine bought before the year end reduces this year's bill; the same machine bought two weeks later waits a full year to do the same work.
Many UK companies run December or March year ends, which puts the closing months of the calendar year in the buying window for one group and the new year for another. For a trade buyer that timetable is worth knowing twice over: once for your own tax planning, and once as context for the bidding you will meet in our plant machinery auctions as year ends approach. Whether that context moves any particular sale is never predictable; your own arithmetic is the part you control.
Universal Auctions Group Ltd acts solely as auctioneer and agent for the vendor and is not a party to the contract of sale, which is formed between the vendor and the successful bidder. Our auctions are trade-only, so bidders register and bid in a business capacity and there is no consumer cooling-off right.
What are capital allowances, in plain terms?
They are the tax system's version of depreciation. Accounting depreciation is not deductible for tax, so capital allowances exist instead: they let a business deduct the cost of qualifying plant and machinery from its taxable profits, either all at once under the Annual Investment Allowance or spread over years as writing down allowances. The rules and rates are set by HMRC and change over time.
Three allowances cover most machinery buying. The Annual Investment Allowance gives a 100% deduction in the year of purchase on qualifying plant and machinery, up to a £1 million annual limit. Full expensing gives companies a 100% first-year deduction on qualifying new and unused main-rate plant. Writing down allowances spread relief on anything not covered by the first two. Which applies to your purchase depends on your business, the asset and the year, which is exactly the conversation to have with your accountant.
- Annual Investment Allowance. What it covers: Qualifying plant and machinery, up to £1m a year. Worth knowing: Generally available on used equipment, which is what auction sells.
- Full expensing. What it covers: New and unused main-rate plant, companies only. Worth knowing: Not available on second-hand machinery.
- Writing down allowances. What it covers: Expenditure outside the 100% reliefs. Worth knowing: Relief spread over years at set rates.
- Cars. What it covers: Separate regime entirely. Worth knowing: Vans and trucks are treated differently from cars; check the class.
Does used machinery from auction qualify for capital allowances?
Generally, yes: the Annual Investment Allowance is not limited to new equipment, so qualifying used plant and machinery bought for use in your business can attract the 100% deduction, subject to the rules. Full expensing is different: it applies to new and unused plant only, so it does not cover auction machinery. Confirm your own position with your accountant, because conditions and exceptions apply.
That difference is the practical point for auction buyers. The headline relief most businesses will use on a used machine is the AIA, and the £1 million annual limit is far above most trade buying, so in the common case the whole qualifying cost can be deductible in the year of purchase. The cost for these purposes includes what you actually paid for the machine, and your accountant will confirm what else can be included and how the VAT you recover interacts with it.
What difference does buying before your year end make?
It brings the deduction forward a full year. As an illustrative example, a company paying corporation tax at the 25% main rate buys a £20,000 machine that qualifies for the Annual Investment Allowance: the deduction reduces taxable profits by £20,000, saving £5,000 of tax and making the effective net cost £15,000. Buy after the year end and the same saving arrives a year later.
The saving is the same size either side of the date; what moves is when you get it, and a year of cash flow is worth something real to a trading business. The illustration assumes the company has £20,000 of profits to relieve at 25%: a business with lower profits, a different rate, or losses gets a different answer, which is why the number is illustrative rather than typical or achievable and why your accountant should run it on your figures.
What counts as the purchase date for allowances?
Broadly, expenditure is incurred when the obligation to pay becomes unconditional, which for an auction purchase is anchored in the sale completing rather than in when the machine reaches your yard. Near a year end the exact date can matter, and the rules contain detail this guide does not cover, so put the question to your accountant before you rely on the timing.
The auction mechanics give you clean paperwork either way: a dated invoice, payment by bank transfer ordinarily within 24 hours of the invoice being issued, and a collection that follows cleared funds. Two mechanics are worth planning around near a deadline. Bidding on a timed sale normally remains open for several days, with the exact closing times stated for each auction, so a sale closing in the last week of your year needs entering with time in hand. And a bid below reserve becomes a provisional bid valid for 24 hours after the sale closes, which the vendor can accept, so the paperwork date on a provisional acceptance lands later than the close itself.
How do you plan an October-to-December buying window?
Work backwards from your year end. List the machinery the business actually needs, agree the tax position and budget with your accountant, then watch the sales with enough weeks in hand to lose a lot and catch the next one. Timed sales run continuously, bidding on each normally remains open for several days with the exact times stated per auction, and collection follows payment by appointment.
The discipline is buying machines the business needs anyway, on a timetable that captures the relief. Tax relief improves a good purchase; it does not rescue a bad one, and a machine bought only for the deduction still has to be moved, stored and eventually used or sold.
- 10 to 12. What to do: List the genuine needs and see your accountant. Why then: Eligibility and budget set everything after.
- 6 to 10. What to do: Watch the sales, bid your maximums. Why then: Room to lose a lot and catch the next one.
- 3 to 6. What to do: Close out the remaining purchases. Why then: Bidding runs days and payment follows the invoice.
- 0 to 3. What to do: Stop starting, finish the paperwork. Why then: Provisional bids and payment dates need to land inside the year.
The window plan in full:
- List the genuine needs: replacements due, capacity the order book justifies, kit the team already hires repeatedly.
- Sit down with your accountant: confirm AIA eligibility, the profit position, and any date sensitivities near the year end.
- Set all-in budgets per machine and work each back to a maximum hammer bid by division.
- Bid across the autumn sales with slack before the deadline, and keep every invoice and payment record filed for the claim.
What does the all-in arithmetic look like?
The same as any auction purchase: the invoice is the hammer price plus the buyer's premium at the rate on that lot's Additional Fees tab, plus VAT at 20% on the hammer unless the lot states otherwise and on the premium. Work your budget back by division: on an illustrative 15% premium, £15,000 all-in divided by 1.2 and then by 1.15 gives a £10,869 maximum hammer bid.
Keep the two calculations separate in your head: the all-in arithmetic decides what you can bid, and the capital allowances arithmetic decides what the purchase really costs after tax. A VAT-registered business normally recovers the VAT in the usual way, so the tax-relief calculation typically runs on the net cost, another line your accountant will confirm. What matters at the auction itself is only the first calculation: bid the number your budget produces, and let the close do its work. In our current timed-auction format, each lot closes on a rolling ten minute soft close, so a valid late bid resets that lot's countdown and sniping gains nothing.
What should you agree with your accountant before bidding?
Four things: that the machinery you plan to buy qualifies for the allowance you expect; that the business has the profits to use the deduction this year; how the purchase date rules apply against your year end; and the budget the tax position supports. Ten minutes on those four questions before the sale beats any amount of correction after it.
Bring your accountant the specifics: what the machine is, roughly what it will cost all-in, when the sale closes and when you would pay. The answers turn on your accounts, not on general rules, and this guide stays general deliberately. Where the machinery is being bought to replace kit you will sell, ask about the disposal side too, because selling the old machine has its own capital allowances consequences.
Common mistakes to avoid
- Buying for the deduction alone. Relief improves a purchase the business needed anyway. A machine you did not need is a cost, whatever the tax line says.
- Assuming full expensing covers auction kit. It applies to new and unused plant. The relief to ask about on used machinery is the Annual Investment Allowance.
- Leaving the purchase to the last sale of the year. Bidding runs days, payment follows the invoice, and a provisional bid can land after the close. Leave slack.
- Running the tax arithmetic on the hammer price. The relief runs on cost under the rules; your bidding runs on the all-in invoice. Keep both straight, on your accountant's numbers.
- Treating this guide as advice. It is general information. Rates, limits and eligibility change and depend on your facts: confirm everything with your accountant.
About this guide, and where to check the terms
Last reviewed 22 September 2026. This guide is general information for trade buyers and is not tax, legal or financial advice, and every figure in it is illustrative rather than typical or achievable. Capital allowances rules, rates and limits change and their application depends on your business's facts, so take advice from your accountant before relying on any position described here. The terms of the individual sale govern each lot.
- Auction terms and conditions. Registration, bidding, payment, collection, storage and export: universalauctionsgroup.com/terms-and-conditions.
- Plant machinery auctions. Current plant, machinery and workshop sales: plant machinery auctions.
- Capital allowances. The official rules and current limits: gov.uk/capital-allowances.
- Buyer fees. The buyer's premium and any other charges for a lot are stated on that lot's Additional Fees tab.
Frequently asked questions
Can I claim capital allowances on second-hand machinery from an auction?
Generally, yes. The Annual Investment Allowance is not restricted to new equipment, so qualifying used plant and machinery bought for use in your business can attract a 100% deduction in the year of purchase, up to the annual limit and subject to the rules. Full expensing is the exception: it applies only to new and unused plant. Confirm your own position with your accountant.
What is the Annual Investment Allowance limit?
The Annual Investment Allowance gives a 100% deduction on qualifying plant and machinery expenditure up to £1 million a year, which sits far above most trade machinery buying. Rates and limits are set by HMRC and can change, so check the current position on gov.uk or with your accountant when planning a purchase.
Does buying before my year end really save tax?
It brings the deduction forward a year rather than making it bigger. A qualifying purchase before the date reduces this year's taxable profits; the same purchase after the date reduces next year's. Whether that timing is worth acting on depends on your profits, rate and cash flow, which is a conversation for your accountant, not a rule this guide can give you.
Do auction fees count in the cost for capital allowances?
The claim runs on the cost of the machine under HMRC's rules, and what can be included beyond the hammer price is exactly the sort of detail to confirm with your accountant, along with how recovered VAT interacts with it. Keep the invoice and payment records from the sale: the auction paperwork gives the claim clean, dated evidence either way.
When is auction expenditure incurred for tax purposes?
Broadly, when the obligation to pay becomes unconditional, which for an auction purchase is anchored in the sale completing rather than in collection. Near a year end the precise date can matter, and provisional bids accepted after the close add a wrinkle, so put the timing question to your accountant before relying on a purchase landing in a particular year.
Are vans and trucks covered by the same allowances as machinery?
Commercial vehicles such as vans and lorries are generally treated as plant and machinery for these purposes, while cars sit under a separate regime with different rules. The classification of any particular vehicle, and the allowance it attracts, is one of the four things worth agreeing with your accountant before you bid.
Sources and references
- Claim capital allowances · GOV.UK / HMRC, 2026 https://www.gov.uk/capital-allowances
- Annual Investment Allowance · GOV.UK / HMRC, 2026 https://www.gov.uk/capital-allowances/annual-investment-allowance
- Corporation Tax rates and reliefs · GOV.UK / HMRC, 2026 https://www.gov.uk/corporation-tax-rates
Our plant machinery auctions run online through the autumn and winter, so you can buy the machines your business needs before your year end and bid from wherever you are. Each lot's charges are stated on its Additional Fees tab, and the equipment stays with the vendor until it is sold and paid for.
View plant machinery auctionsUniversal Auctions Group · EORI registered and export-ready. This article is general information for trade buyers and sellers and is not financial, tax or legal advice.
