When you buy or sell a dental practice in the UK, the total price is not a single undifferentiated figure. On an asset sale it is split into two distinct categories: goodwill and tangible assets. The proportion allocated to goodwill is typically between 60% and 80% of the total, with the equipment, fixtures and fit-out making up the balance. The exact split depends on the practice's NHS/private mix, its location, its profitability and the value of its physical equipment.
This article explains how the goodwill percentage is arrived at, what pushes it up or down, and why the split between goodwill and tangibles matters so much for tax on both sides. The deep mechanics are linked below, so here we keep to the shape of the split and the headline tax consequences using current 2026/27 rules.
What Is Goodwill in a Dental Practice Sale?
Goodwill is the intangible value of a practice that sits beyond its physical assets. It captures the reputation, the patient list, the location, the established referral relationships and the ongoing income stream the buyer is acquiring. In a dental context it is usually the largest single component of the price.
For NHS-heavy practices, goodwill is closely tied to the value of the UDA contract and the established performer base. Bear in mind there is no national UDA value: each contract is priced on its own per-UDA figure, so two superficially similar NHS practices can carry very different goodwill. For private practices, goodwill reflects the recurring patient base, the fee levels and the brand. Mixed practices sit between the two.
HMRC treats goodwill as a capital asset. When you sell a practice, the gain on goodwill falls under Capital Gains Tax (CGT), not income tax. For the buyer, goodwill acquired on or after 1 April 2019 may qualify for fixed-rate amortisation relief at 6.5% per year, but only where the qualifying conditions are met (more on that below). Goodwill is valued primarily on normalised EBITDA multiplied by a market multiple, and those multiples are best treated as ranges rather than a single number. The full method is set out in our guide to dental practice valuation methods.
Typical Goodwill Percentages by Practice Type
There is no single correct goodwill percentage. The split tracks the character of the practice. As a rough guide for current UK dental transactions, the ranges look like this:
- NHS-heavy practice (predominantly NHS income): goodwill around 60-70% of the total, tangible assets 30-40%. The UDA contract is the primary value driver, but the physical surgery and equipment still carry weight.
- Mixed practice (broadly even NHS/private): goodwill around 65-75%, tangible assets 25-35%. Private income adds a premium to goodwill, but the practice still needs functional equipment to deliver.
- Private practice (predominantly private income): goodwill around 70-80%, tangible assets 20-30%. Private practices tend to command higher goodwill multiples because patient loyalty and fee levels are less constrained by NHS contract terms.
- Single-surgery or low-equipment practice: goodwill can reach 80-85% where the practice has minimal physical assets but strong, sticky patient flow.
- Multi-surgery, high-equipment practice: goodwill can fall towards 55-65% where the practice carries expensive digital scanners, CBCT or OPG machines and recently refurbished surgeries.
These percentages are guidelines, not rules. Every transaction is negotiated individually, and the final allocation must reflect the actual value of the assets being transferred. The table below shows how the same broad price might be apportioned across two contrasting practices, expressed purely as percentages of the total.
| Component | NHS-heavy practice (% of price) | Private, high-equipment practice (% of price) |
|---|---|---|
| Goodwill | 65% | 72% |
| Plant and machinery (chairs, X-ray, compressors, autoclaves) | 18% | 14% |
| Integral features and fit-out (electrics, water, ventilation) | 12% | 9% |
| Furniture, fittings and other tangibles | 5% | 5% |
| Total | 100% | 100% |
The point of breaking the tangibles down further is that not every physical asset is taxed the same way. Plant and machinery, integral features and the building structure each have a different capital-allowance route, which is why the equipment slice itself is worth itemising rather than treating as one lump.
Why the Goodwill Split Matters for Tax
The allocation between goodwill and tangible assets is not an accounting formality. It sends each slice of the price down a different tax regime, with direct consequences for both buyer and seller. The headline points are below; for the full worked tax treatment of the line, see our detailed piece on splitting a dental practice sale price between goodwill and equipment.
For the Seller
When you sell a dental practice, the gain on goodwill is a capital gain. If you qualify for Business Asset Disposal Relief (BADR), the CGT rate on qualifying gains is 14% for disposals between 6 April 2025 and 5 April 2026, then 18% from 6 April 2026, subject to the GBP 1m lifetime limit per individual. That step up from 14% to 18% is a live planning lever: an unconditional exchange on or before 5 April 2026 can fix the 14% rate even where completion follows later, because the CGT date of disposal is the contract date for an unconditional contract.
The gain on tangible assets is also a capital gain, but those assets will often have been written down through capital allowances, so the base cost can be low and the gain correspondingly higher. Where the practice is sold as a going concern, the goodwill and the qualifying tangibles together can fall within BADR, provided the seller meets the conditions throughout the two-year qualifying period (a trading business, and for a share sale the 5% ordinary-share-capital and 5% voting-rights tests plus officer or employee status).
One subtlety on the tangibles side: AIA-relieved equipment still carries a disposal value when sold with the practice, which can trigger a balancing charge clawing back excess allowances. So a higher equipment allocation is not automatically in the seller's favour. The seller generally wants the fixtures value (and the s.198 figure) kept lower to limit that balancing charge, which sits directly against the buyer's preference.
For the Buyer
The buyer's treatment differs sharply between the two slices. Tangible assets (dental chairs, X-ray units, compressors, computers) qualify for capital allowances. The Annual Investment Allowance (AIA), GBP 1m per year, gives 100% first-year relief on most qualifying plant and machinery, so a large part of the equipment cost can be written off against taxable profit quickly. Anything not covered by AIA enters the pools, with the main-rate writing-down allowance at 18% reducing to 14% from April 2026 (FA 2026 s.28) and the special-rate pool (integral features such as electrical, water and ventilation systems) at 6%.
Goodwill does not qualify for AIA. Where goodwill is acquired on or after 1 April 2019, the buyer (a company) may claim fixed-rate amortisation relief at 6.5% per year, effectively a 15-year write-down. This relief is not automatic: the goodwill must be acquired as part of a business acquisition that also includes qualifying intellectual property assets, and the relief is capped at six times the qualifying-IP expenditure. The relief on equipment is therefore far faster than the relief on goodwill, which is why a buyer often leans towards a higher tangible allocation, balanced against the seller's resistance and the need to keep the split commercially defensible. The detail of the amortisation rules is in our guide to goodwill amortisation for a dental practice acquired after April 2019.
How the Price Allocation Is Negotiated
The split is agreed between buyer and seller as part of the sale and purchase agreement (SPA), and the two sides have competing interests:
- Seller: may prefer a higher goodwill allocation, because goodwill gains are capital and can qualify for BADR, and because a smaller equipment allocation limits any balancing charge on AIA-relieved kit.
- Buyer: generally prefers a higher tangible allocation to accelerate relief through AIA and writing-down allowances, since goodwill relief at 6.5% (where it is available at all) is much slower. The buyer's accountant will model the tax impact of different splits.
In practice the split is anchored by an independent valuation. A dental practice valuer assesses the fair market value of the tangible assets, typically on a depreciated-replacement-cost or market-value basis, and the remainder is goodwill. HMRC can challenge an allocation that looks artificial or tax-motivated, so the split has to be commercially justifiable rather than reverse-engineered to a tax answer.
Tangible Assets: What Gets Valued?
Tangible assets in a dental practice typically include:
- Dental chairs and delivery units
- X-ray equipment (intraoral, OPG, CBCT)
- Compressors and suction units
- Autoclaves and sterilisation equipment
- Computers, practice management software and servers
- Furniture, fixtures and fittings (reception desks, cabinetry)
- Leasehold improvements and surgery fit-out (plumbing, electrical and ventilation work)
Fit-out is a common area of negotiation. Where the seller has spent significantly on refurbishment, that cost is reflected in the tangible value. The buyer can claim capital allowances on qualifying fixtures (chairs, compressors, X-ray units) and on integral features (electrical, cold and hot water, heating, air and ventilation systems, which sit in the 6% special-rate pool), but not on the building fabric itself. For qualifying construction spend incurred on or after 29 October 2018, the buyer may instead claim Structures and Buildings Allowance (SBA) at 3% per year on the building element, which excludes the land and the plant already pooled.
Common Pitfalls in Price Allocation
Several mistakes recur when dentists agree the goodwill split without dental-specific advice:
1. Over-allocating to goodwill to reduce the seller's tax. If the seller pushes for a higher goodwill percentage but the buyer then cannot claim allowances on the suppressed equipment value, the buyer's position worsens and the deal has to work for both sides. An allocation that is obviously skewed also invites an HMRC challenge.
2. Ignoring the s.198 election. On an asset sale with fixtures on which the seller has claimed capital allowances, buyer and seller must jointly elect under CAA 2001 s.198 to fix the transfer value of those fixtures. The post-April-2014 rules also require the seller to have pooled the fixtures and to satisfy the fixed-value requirement (s.187A). The election must be made within two years of the sale. Without it, the buyer's fixtures allowances are lost permanently. This is one of the most preventable losses in a practice purchase.
3. Assuming goodwill amortisation is automatic. Goodwill acquired before 1 April 2019 generally has no amortisation relief, and goodwill acquired between 8 July 2015 and 31 March 2019 was excluded from relief altogether. Even for acquisitions on or after 1 April 2019, the 6.5% relief depends on the qualifying-IP condition and the six-times cap, so it is wrong to assume that buying after April 2019 always delivers 6.5%. Check the date and the conditions.
4. Not getting a professional valuation. HMRC can reallocate a split that looks unreasonable. If the tangible assets are clearly undervalued to inflate goodwill, HMRC may reallocate the price and trigger additional tax and penalties on both parties. Always use a qualified dental practice valuer and keep the working.
Worked Illustration: Two Contrasting Practices
Take a single-surgery NHS practice with little equipment: a chair, an intraoral X-ray unit, a compressor and suction, an autoclave, a computer and a modest fit-out. Its value is driven overwhelmingly by the NHS contract and patient list rather than the kit, so the goodwill share could sit at the top of the range, perhaps around 85%, with tangibles at 15%. The buyer claims AIA on the small plant slice in year one and, if the goodwill qualifies, 6.5% amortisation trailing behind.
Flip it to a multi-surgery practice with a new CBCT machine, several digital scanners and a recent refurbishment, and far more value sits in the tangibles. The goodwill share might drop towards 70-75% and the equipment share rise to 25-30%. The buyer here gets considerably more front-loaded relief through AIA and writing-down allowances, because a larger proportion of the price sits in the capital-allowance regime rather than in slow goodwill amortisation. Same broad goodwill range, very different tax profile, driven entirely by the asset mix.
How to Get the Split Right
Both buyer and seller should engage a dental-specialist accountant and a practice valuer before agreeing the allocation. The valuer produces a detailed schedule of tangible assets with market values; the accountant models the tax impact of different splits for each side.
Key steps:
- Obtain a professional valuation of the tangible assets, not a guess.
- Agree the split in the SPA, not after completion.
- Complete a joint s.198 election for fixtures where applicable, within the two-year window, and confirm the pooling requirement is met.
- Keep the split commercially justifiable rather than purely tax-driven.
- Document the basis for the allocation in case HMRC queries it.
- For a seller eyeing the BADR rate step, watch the disposal-timing point around 5 April 2026.
Final Thoughts
The goodwill percentage of a dental practice price typically falls between 60% and 80%, but the exact figure depends on the asset base, the income mix and the location. Getting the split right is not just about agreeing a number. It decides the CGT and BADR position for the seller, the capital allowances and amortisation for the buyer, and whether the deal works for both sides.
Work with a dental-specialist accountant and a qualified valuer so the allocation is both commercially sensible and tax-efficient. Every practice is different, and a one-size-fits-all approach to the split can cost real money in unnecessary tax.
If you are considering buying or selling a dental practice, speak to our team. We provide practice valuation services and dental accounting tailored to your situation.