Most VAT discussion aimed at dentists is about charging VAT: which treatments are exempt, which are standard-rated, and when registration bites. This page is about the other direction. Once a practice is registered and making a mix of exempt and taxable supplies, the harder and more valuable question is how much of the VAT it pays on its own costs it can reclaim. That is the world of partial exemption, and it is where a careful practice recovers real money and a careless one either loses recovery it was entitled to or claims recovery it was not.

The supply of dental care is exempt from VAT under VATA 1994 Schedule 9 Group 7, whether NHS-funded or private, because it is the provision of medical care. Purely cosmetic work with no therapeutic purpose, and the retail sale of products, are standard-rated. A practice that does both is partially exempt and recovers only part of its input VAT. The mechanics below are the standard method, the de minimis rule, the special method, and the annual adjustment, worked through with dental numbers. Our broader dental VAT and compliance guide sets the registration and liability context; this is the partial-exemption deep dive that sits underneath it.

Why a dental practice is partially exempt

A single-site practice usually has two or three income streams from a VAT point of view. The dominant one is exempt dental care: examinations, fillings, extractions, root canals, hygiene, NHS and private treatment alike, all exempt under Schedule 9 Group 7 because the principal purpose is protecting, maintaining or restoring health. Sitting beside it is a smaller standard-rated stream: cosmetic-only work where there is no therapeutic purpose (the classic borderline cases being some facial aesthetics and tooth whitening sold as a cosmetic product), and any genuine retail sales such as take-home whitening kits or electric toothbrushes at reception. A practice that also lets part of its premises under an option to tax has a third taxable stream.

Because the practice makes both exempt and taxable supplies, it cannot reclaim all the VAT on its costs. It is partially exempt, and the law gives it a defined way to work out how much VAT comes back. The right to deduct sits in VATA 1994 sections 24 to 26, and the method for splitting input VAT in a partly exempt business is in the VAT Regulations 1995 (SI 1995/2518), regulations 99 to 110. Which income is the standard-rated leg that creates any recovery at all is itself a judgment call, and the principal-purpose line between cosmetic and therapeutic work is covered in our companion guide on cosmetic versus therapeutic dental VAT. The point to hold onto here is that without a taxable leg there is nothing to recover; the taxable income is what unlocks the input VAT in the first place.

The three buckets every cost falls into

This is the concept most owners get wrong, so it is worth slowing down. Every cost on which the practice pays VAT has to be attributed to one of three categories.

  • Directly attributable to taxable supplies. The VAT is fully recoverable. Examples: consumables used only in cosmetic-only treatment, the cost of retail stock bought to resell, marketing for the private cosmetic line. If a cost exists only because of the taxable side, its VAT comes back at 100%.
  • Directly attributable to exempt supplies. The VAT is fully irrecoverable. Examples: a clinical item used only in NHS or exempt private dentistry, lab fees for a named-patient prosthesis (themselves an exempt supply, so usually no VAT to recover anyway). If a cost exists only because of the exempt side, its VAT is lost.
  • Residual or overhead. The VAT is apportioned. Examples: rent, utilities, reception staff, the practice management software, accountancy, the building's shared services. These costs support both the exempt and the taxable sides, so a fair slice of their VAT is recoverable and the rest is not.

The single most common partial-exemption error is treating all overhead VAT as fully recoverable because the practice happens to be VAT-registered. Registration does not make overhead VAT fully reclaimable. Only the directly-attributable-taxable bucket is fully recoverable; the residual bucket has to be apportioned. Coding income and costs so the three buckets can actually be populated starts in the bookkeeping, which is why we tie this to how you build management accounts for an NHS and private mix.

The standard method: the turnover calculation

For the residual bucket, the default approach is the standard method, which apportions overhead VAT in proportion to taxable turnover. The recovery percentage is:

Recoverable residual % = value of taxable supplies ÷ value of all supplies

and the result is rounded up to the next whole percent. (The two-decimal-place version of the calculation only applies to very large businesses with residual input tax above £400,000 a month, which no single dental practice reaches, so a dental practice always rounds up to the next whole number.)

Worked example A, the standard-method residual recovery (2025/26). A registered single-site practice has £620,000 of exempt dental income and £80,000 of standard-rated cosmetic and product income, a total of £700,000 (all VAT-exclusive). The residual recovery percentage is 80,000 ÷ 700,000 = 11.43%, rounded up to 12%. Suppose the practice has £40,000 of residual input VAT for the year on rent, utilities, reception and accountancy. It recovers 12% of that, which is £4,800. On top of that it recovers 100% of any directly-attributable-taxable VAT (for example VAT on cosmetic-only consumables or retail stock), and 0% of any directly-attributable-exempt VAT. So total recovery is the directly-attributable-taxable figure plus £4,800, not the whole £40,000.

The lesson is that the residual percentage is usually low for a dental practice because exempt dental care dominates turnover. Getting the recovery right is therefore less about squeezing the residual percentage and more about correctly capturing the directly-attributable-taxable VAT, which comes back in full.

The de minimis rule: when you can recover everything

There is a relief that lets a practice with modest exempt-related input tax recover all of its VAT, including the exempt-related part. This is the de minimis rule, and it has two limbs that must both be satisfied:

  • exempt input tax is no more than £625 a month on average (£7,500 a year); AND
  • exempt input tax is no more than 50% of total input tax.

If both are met, the practice is treated as fully taxable for the period and recovers 100% of its input VAT. If either limb is breached, the exempt input tax stays irrecoverable and the practice is back to the standard-method split. The £625 figure is an average over the period, so a single heavier quarter can be balanced by lighter ones; it is the annual position that ultimately governs (see the annual adjustment below).

Worked example B, the de minimis rule gives full recovery (2025/26). A mostly-NHS practice has total input VAT of £18,000 for the year, of which £6,000 is attributable to (or residual against) exempt supplies. Test the two limbs: £6,000 ÷ 12 = £500 a month, which is under £625; and £6,000 is 33% of £18,000, which is under 50%. Both limbs are met, so the practice is treated as fully taxable and recovers the whole £18,000, including the £6,000 that would otherwise have been lost.

Now change one fact. The practice opens a dedicated cosmetic suite and its exempt-related input tax rises to £8,400 for the year. That is £700 a month, over the £625 limb. The first limb is breached, de minimis no longer applies, and the £8,400 is no longer fully recoverable; only the standard-method share of the residual part comes back. A small change in scale flipped the whole result, which is exactly why a growing cosmetic or retail line is the trigger to revisit the calculation.

The simplified de minimis tests

Running the full de minimis test every quarter is fiddly because it requires you to have already attributed input tax to the exempt side. HMRC therefore allows two simplified tests that a practice can apply first; if it passes either, it can treat itself as de minimis for the period without doing the full calculation.

  • Simplified test one: total input tax is no more than £625 a month on average AND the value of exempt supplies is no more than 50% of total supplies. If both hold, you are de minimis without splitting the input tax at all.
  • Simplified test two: total input tax less input tax directly attributable to taxable supplies is no more than £625 a month on average AND the value of exempt supplies is no more than 50% of total supplies.

For a small mostly-NHS practice with low total input tax, simplified test one often disposes of the whole question in a couple of lines. You still confirm the position at the annual adjustment, but the simplifications save real time in-year.

When the standard method is unfair, and the special method

The turnover-based standard method is a blunt instrument. It assumes overhead is consumed in proportion to income, which is frequently untrue in a dental practice. The classic mismatch is a capital-heavy cosmetic or implant suite that occupies a large share of the building and consumes a large share of running costs but generates only a small share of turnover. Under the standard method, the suite's overhead VAT is recovered at the low turnover percentage, which under-recovers the VAT that genuinely relates to the taxable work done in that room.

The answer is a partial exemption special method (PESM). A special method replaces the turnover split with a basis that better reflects how costs are actually used: floor area, staff time, room hours, treatment-room occupancy, or transaction counts. Crucially, a special method must be approved by HMRC in writing before you use it, and you must submit a declaration that the method is fair and reasonable. You cannot adopt a floor-area basis unilaterally because it gives a better number.

Worked example C, a special method beats the standard method (2025/26). A practice runs a dedicated implant and cosmetic suite that occupies 30% of the floor area but generates only 11% of turnover. The turnover-based standard method recovers the suite's running-cost VAT at roughly 11%, which under-recovers. An agreed floor-area special method would recover around 30% of the suite's apportionable overheads, a materially better and fully defensible result because it reflects real usage. The practice applies to HMRC in writing, makes the fair-and-reasonable declaration, and only switches once approval is received. This is the manoeuvre governed by VAT Regulations 1995 regulations 99 to 110.

One anonymised illustration of how this plays out: a mixed practice that had been recovering VAT on all its overheads at the standard turnover rate switched to an agreed floor-area special method for its implant suite and lifted defensible recovery without an HMRC challenge, precisely because the method was approved and documented before use rather than retrofitted.

The provisional-then-final shape of the VAT year

Partial exemption is calculated twice: provisionally during the year and finally at the year end. Each quarter, you recover provisionally using either that period's own figures or, if agreed with HMRC, the previous year's recovery percentage as a working estimate. These quarterly recoveries are deliberately approximate, because income mix moves around within a year (a quiet summer, a busy cosmetic January). They are trued up later.

This provisional-then-final shape matters because it means no single quarter's recovery is the last word. A practice should not panic if one quarter's split looks off; the annual adjustment is the mechanism that fixes it.

The annual adjustment

At the end of the VAT year (the longer period), you recalculate the recovery across the whole year as if it were one period. You compare the recovery you were entitled to for the full year against the total of your provisional quarterly recoveries. The difference is settled with HMRC, repaid to you if you under-recovered or reclaimed from you if you over-recovered, normally on the first VAT return after the year end.

The annual adjustment does two important things. First, it smooths out seasonal income swings so the practice ends up with a fair full-year recovery rather than a quarter-by-quarter lottery. Second, it is where the de minimis test is re-run for the year as a whole. A practice that breached £625 in one heavy quarter but averaged under £625 across the year can still be de minimis for the year and recover everything; the reverse is also true. The annual de minimis test is the one that ultimately governs, which is why forgetting the annual adjustment is one of the costliest partial-exemption mistakes.

Capital items sit outside this and run for years

One category of spend does not settle inside the ordinary annual partial-exemption calculation: large capital items. Where a practice spends £250,000 or more (VAT-exclusive) on land, a building or a refurbishment, the VAT recovery is not fixed once at year one. The Capital Goods Scheme runs a separate 10-year adjustment (with the partial-exemption percentage as its baseline), revisiting the recovery each year as the practice's taxable-use percentage shifts. A surgery rebuild or a freehold purchase is the classic trigger.

Because that machinery is substantial in its own right, it has its own page. See our guide to the Capital Goods Scheme on a dental practice refurbishment for the thresholds, the 10-interval clock and the clawback-or-refund formula. The key linkage to remember here is that the annual partial-exemption percentage you have just calculated is the baseline the Capital Goods Scheme adjusts around.

Record-keeping that survives an HMRC review

Partial exemption is one of the areas HMRC reviews most often in mixed-supply businesses, because it is easy to over-claim. A practice that can produce its workings on request rarely has a problem; one that cannot is exposed. The records that matter are:

  • Coded income streams so exempt dental care, standard-rated cosmetic-only work and retail product sales are separated at source in the bookkeeping.
  • An attribution log for every significant cost, showing which of the three buckets it falls into and why.
  • The special-method approval letter, if you use a PESM, kept with the calculations it supports.
  • The annual-adjustment workings for each VAT year, showing the full-year recalculation and the de minimis re-test.

Keep these for at least six years, and keep Capital Goods Scheme records longer still because that adjustment period runs for ten years. Coding income streams correctly is the foundation that makes the whole split possible, which is why the partial-exemption calculation and the structure of your NHS and private mix accounts are really the same project viewed from two angles.

How this connects to registration and to a group

None of this arises until the practice is VAT-registered, and a practice only has to register when its taxable (non-exempt) turnover exceeds £90,000 (the threshold from 1 April 2024). Exempt dental income does not count towards that figure, which is why a large mostly-NHS practice can sit well below the threshold despite a high total turnover. Our page on the VAT registration threshold and requirements explains exactly what counts towards the £90,000 and what does not.

This page deals with a single site. A multi-site group has the same mechanics but extra moving parts: a group registration, cost-sharing between sites, and a single residual calculation across the group. That is a distinct problem with its own page; see partial exemption and cost-sharing for a multi-site dental group. The single-practice owner should master the three-bucket split, the de minimis test and the annual adjustment first; the group layer builds on exactly these foundations.

Common errors

  • Treating all overhead VAT as fully recoverable. Residual VAT is apportioned, not reclaimed in full, even though the practice is registered.
  • Forgetting the annual adjustment. The quarterly figures are provisional; the year-end recalculation, including the annual de minimis re-test, is the one that governs.
  • Applying a special method without written HMRC approval. An unapproved PESM unravels on review and the practice is reverted to the standard method, often with an assessment.
  • Treating de minimis as a one-off quarterly test. It is tested provisionally each period and definitively for the year as a whole; the annual position can differ from any single quarter.
  • Ignoring small but real exempt input tax on the basis that the cosmetic or retail line is tiny. Even a small line can push exempt input tax over £625 a month and end full recovery.

When to get advice

The trigger points are predictable. A growing cosmetic or product line is the most common, because it can quietly push the practice through the de minimis limit and change the answer from full recovery to a partial split. A planned fit-out or refurbishment is another, both because it generates a large block of residual VAT and because spend over £250,000 pulls in the Capital Goods Scheme. And a first HMRC partial-exemption query is the third: the practices that come through a review cleanly are the ones whose attribution log, method approval and annual-adjustment workings were already in order. Getting the structure right before any of these arrives is far cheaper than reconstructing it under an enquiry.