When you need new equipment for your dental practice, the way you finance it has real tax consequences, and they are easy to get wrong. Whether you are buying a new chair, installing a CBCT scanner, replacing an autoclave or upgrading your imaging, the finance method you choose decides whether you get capital allowances on the cost or a running deduction for the payments. Same chair, different tax outcome. Treating the decision as a pure monthly-cost comparison misses half the picture.
This guide focuses on the tax implications of each route at 2026/27 rates: how outright purchase, hire purchase and leasing are taxed, the capital-allowances treatment behind each, the Finance Act 2026 changes to factor in, and the VAT point that catches most clinical practices out. If you want the four finance methods set out side by side as a decision framework, that lives in our equipment finance lease vs hire purchase vs buy guide. This page is the tax-treatment companion to that comparison.
The one fork that decides everything: ownership for tax
Every finance route resolves to a single question. Are you treated as the owner of the asset for tax, or as renting it? That fork decides whether you get capital allowances or deductible rentals, and you never get both on the same asset. Where you are the owner (outright purchase, hire purchase), you claim capital allowances on the cost and can front-load the relief through the Annual Investment Allowance. Where you are renting (finance lease, operating lease), the finance company owns the asset for tax and claims the allowances, so you claim none and deduct what you pay as a revenue expense instead. Both routes give relief in the end. They differ in when, and that timing difference is the heart of the decision.
Finance method, tax treatment and capital allowances at a glance
The table below maps each method to its tax treatment and the capital-allowances position. The figures and rates underneath it are explained in the sections that follow.
| Finance method | Treated as | Capital allowances | What you deduct instead |
|---|---|---|---|
| Outright purchase (cash) | Buying the asset (you own it) | Yes, on the full cash cost. Usually 100% via AIA in year one | Nothing extra (no interest, no rentals) |
| Hire purchase (HP) | Buying the asset (CAA 2001 s.67) | Yes, on the cash price (capital element), as if owned once in use | The HP interest, separately, as a revenue expense over the term |
| Finance lease | Renting (lessor owns it for tax) | No capital allowances for the practice | The rentals, as a revenue expense over the term |
| Operating lease | Renting (a true rental) | No capital allowances for the practice | The rentals, fully deductible as incurred |
Outright purchase: capital allowances on the full cost
When you buy equipment outright, you own it, and you claim capital allowances on the full cost in the year you bring it into use. For most dental equipment that means the Annual Investment Allowance (AIA), which gives 100% relief on up to £1,000,000 of qualifying plant and machinery per year. The £1m limit is now permanent, so there is no longer a deadline to beat. Chairs, X-ray and CBCT units, autoclaves, compressors, suction, intraoral and lab scanners and surgery instruments are all qualifying plant and machinery.
The relief is straightforward to value. Bringing £40,000 of qualifying equipment into use and covering it with the AIA removes £40,000 from taxable profits. For a company paying corporation tax at the 25% main rate, that is £10,000 less tax for the year. The catch is cash: outright purchase ties up the whole price now, which many practices would rather keep for working capital or other investment.
Cars stand apart. They are specifically excluded from the AIA, so a car bought through the practice never gets that 100% relief; it goes into a pool and attracts writing-down allowances at a rate set by its CO2 emissions. Most clinical equipment is unaffected, but it matters if you buy a vehicle through the business.
Hire purchase: allowances on the cash price, plus interest relief
Hire purchase often gives you the best of both worlds. For capital allowances, HP is treated as a purchase under CAA 2001 section 67, so you are treated as owning the asset from the moment you bring it into use. You claim the AIA (or writing-down allowances) on the full cash price, the capital element of the deal, even though you are paying in instalments.
The mechanism is favourable and often misunderstood. The full cash price is treated as incurred when the asset is brought into use, not as you pay each instalment. So an HP agreement signed and the chair brought into use before your year-end can pull the whole cash price into that year's AIA, even though you have only paid the deposit and a couple of instalments. You claim on the whole cash price up front, not a slice with each payment.
The interest, or finance charge, built into the instalments is dealt with separately, as a revenue deduction spread over the term in line with the accounts. So an HP deal delivers two distinct reliefs: immediate capital allowances on the cash price, plus an ongoing interest deduction as you pay. This is not double-counting. An HP payment is part repayment of a loan to buy an asset (the capital element, relieved through allowances) and part the cost of that loan (the interest, relieved as a revenue expense). For a practice that wants front-loaded relief without paying the whole price at once, HP is frequently the sweet spot.
Finance lease: no allowances, rentals deductible
Under a finance lease the lessor, the finance company, owns the asset for tax and claims the capital allowances. The practice gets none. Instead, you deduct the rentals as a revenue expense, broadly following the accounting depreciation and finance charge across the term. The relief is spread through the profit and loss account rather than front-loaded, and you cannot claim allowances on top of the rentals.
The trap is that a finance lease can feel like a purchase. You choose the asset, use it for most of its life, carry the risk if it breaks, and on some agreements can buy it for a token sum at the end. Economically it is close to ownership, but for tax, ownership sits with the lessor who claims the allowances, so the agreement may look like buying while the tax treatment is leasing. That means you forgo the AIA. On a £30,000 chair, that is a potential £30,000 immediate deduction given up in exchange for spreading the relief across the term. Over the asset's life the total relief is broadly similar, but you lose the front-loading, and that is a real cost in present-value terms.
Operating lease: pure rental, fully deductible
An operating lease is a true rental. It runs for less than the asset's useful life, and you hand the kit back at the end. There is no ownership and no capital allowances; the rental payments are simply fully deductible as a trading expense as you incur them. This is the route often used for fast-depreciating equipment, imaging and IT you want to refresh on a cycle: you deduct each payment, avoid a large cash outflow and never carry the disposal risk of obsolete kit.
The capital-allowances rates behind a purchase or HP
Where you do get capital allowances (purchase or HP), the rate depends on which allowance applies and which pool the asset falls into.
- Annual Investment Allowance (AIA): 100% relief on up to £1,000,000 of qualifying plant and machinery per 12-month period, permanent. This is the first port of call for most practices, and it covers the great majority of dental equipment spend in a normal year.
- Main-rate writing-down allowance (WDA): applies to main-pool plant and machinery beyond the AIA. The rate is 18% for relief up to April 2026, then 14% from 1 April 2026 (corporation tax) and 6 April 2026 (income tax), under Finance Act 2026 section 28. A period straddling that date uses a time-apportioned hybrid rate. Do not assume a flat 18% for any period after April 2026.
- Special-rate pool: integral features such as electrical systems, cold and hot water, heating, lighting, air conditioning and ventilation (the kind of spend in a surgery fit-out) sit in the special-rate pool, which attracts a 6% WDA. That rate is unchanged. Because 6% is so slow, it is usually best to point your AIA at special-rate items first.
- 40% first-year allowance (FYA): Finance Act 2026 section 29 introduces a 40% first-year allowance on new (not second-hand) main-rate plant and machinery from 1 January 2026, for both companies and unincorporated practices, excluding cars. It is an alternative to the AIA for new kit: the AIA gives 100% in year one, while the 40% FYA gives 40% now and leaves the 60% balance in the pool to attract WDAs. For most practices the AIA still wins because it gives full relief immediately, but the 40% FYA is useful once the £1m AIA is exhausted in a heavy spending year.
For the full qualifying-equipment rules, what counts and what does not, and how the allowances work for sole traders, partnerships and companies, see our AIA allowance for dental equipment guide.
Worked example: AIA versus writing-down allowances
To see why the front-loading matters, compare two ways of relieving the same £40,000 of new main-pool equipment bought and brought into use by a company. These are illustrative tax-computation figures, not equipment prices.
- Relieved in full via the AIA: the whole £40,000 is deducted in year one. At the 25% corporation tax main rate that is £10,000 of tax relief in year one.
- Relieved only through the 14% main-rate WDA (AIA already used up elsewhere): year one relief is 14% of £40,000, which is £5,600 (£1,400 of tax at 25%). The remaining £34,400 is carried in the pool. Year two relief is 14% of £34,400, which is £4,816 (£1,204 of tax), and so on, a declining tail that takes many years to fully relieve.
The total relief is the same either way (you eventually deduct the whole £40,000), but the AIA gives it all in year one while the WDA dribbles it out over more than a decade. In present-value terms, getting £10,000 of tax saved now is worth far more than the same total trickled out at £1,400, then £1,204, then less each year. This is exactly the relief you forgo when you take equipment on a finance lease instead of buying or using HP: you swap a potential year-one AIA claim for rentals spread across the term.
Buying a practice: the fixtures election on equipment in the price
If you acquire equipment as part of buying a whole practice, rather than buying kit on its own, there is an easily-missed step. Where the purchase includes fixtures (items fixed to the building, such as integral plant and certain installed equipment), the buyer's ability to claim capital allowances on them is conditioned by a joint CAA 2001 section 198 election with the seller, which fixes the value attributed to the fixtures and must be made within a 2-year time limit under section 201. There is also a pooling requirement: the past owner must have pooled the fixtures for the buyer to claim. Miss the election and the buyer's fixtures allowances can be lost permanently. The buyer wants a high election value (more future allowances), the seller a low one (a smaller balancing charge), so it is an equal-and-opposite negotiation to settle in the sale agreement. Raise it early, because it cannot be fixed after the 2-year window closes.
VAT: why the input VAT on equipment is usually irrecoverable
This point is the most likely to be misunderstood, because it runs opposite to a normal trading business. The supply of dental care is exempt from VAT under VATA 1994 Schedule 9 Group 7, whether NHS-funded or private. A practice making only exempt supplies cannot reclaim the VAT it pays on its equipment, so that VAT becomes part of the cost of the asset.
That has a direct knock-on for capital allowances: because the VAT is part of the cost, you claim capital allowances on the VAT-inclusive figure. A chair invoiced at £30,000 plus £6,000 VAT therefore gives a clinical practice £36,000 of qualifying expenditure for the AIA, not £30,000. The irrecoverable VAT is genuinely part of what you spent, and it is relieved with the rest of the cost.
A practice that also makes taxable supplies, for example cosmetic-only treatment such as facial aesthetics or tooth whitening with no therapeutic purpose, is partially exempt and may recover the portion of input VAT attributable to those taxable supplies. For a mainly clinical practice, most equipment VAT stays irrecoverable. The finance method changes only the VAT timing: up front on a purchase or HP, on each rental for a lease. It does not change the underlying recoverability, which is driven by your exempt and taxable mix, not by how you fund the kit. Do not assume the VAT comes back simply because the practice is VAT-registered.
Cash flow versus tax efficiency
Tax is one input, not the whole decision. A practice with strong cash reserves and an intention to keep the equipment for its full life may favour outright purchase or HP to capture the front-loaded AIA relief. A practice protecting capital for expansion, or one running fast-obsolescing imaging it expects to refresh, may prefer a lease to spread the cost and hand the asset back at the end.
Your profit position matters too. Immediate capital allowances are only worth claiming if you have enough profit to absorb them. If the practice is loss-making or barely profitable, a large AIA claim simply creates or enlarges a loss to carry, whereas spreading relief through lease rentals or writing-down allowances may match the relief to the years you actually pay tax. For more on weighing the methods against each other, see our lease vs hire purchase vs buy comparison. The same lease-or-own logic for premises rather than equipment is covered in our practice premises lease vs buy framework.
Record keeping and documentation
Whichever route you choose, keep the paperwork that supports the tax treatment. For capital allowances, retain purchase or HP invoices, delivery notes and evidence of when each asset was brought into use, because that date drives the timing of the claim. Keep HP agreements so the capital and interest split is clear, and retain lease agreements and payment schedules to support rental deductions. An equipment register tracking each asset, its cost, finance method and allowances claimed is essential if you ever sell, because equipment on which allowances were claimed carries a disposal value out of the pool on sale (a potential balancing charge), even where the AIA gave 100% relief originally.
Getting professional advice
Equipment finance decisions affect your tax position for years, and the optimal route turns on your profit level, cash flow, whether you intend to keep the kit and your VAT and partial-exemption position. A specialist dental accountant can model the methods against your numbers, point the AIA at the right pool, time a large purchase against your year-end and the April 2026 WDA step, and make sure a section 198 election is in place if the equipment comes with a practice purchase.
If you want help evaluating equipment finance options for your practice, our team specialises in dental practice finances and can model the tax treatment of each route for your situation.