When a dental practice changes hands, goodwill is usually the single largest figure in the deal. It is also the part of the price that is most often misunderstood, because how it is valued, what kind of goodwill it is, and how it is taxed all change depending on whether the practice is sold as a set of assets or as company shares, and whether the buyer is a sole trader or a limited company. This guide stays focused on goodwill itself, leaving the wider mechanics of pricing a whole practice to our separate practice valuation methods guide.
What dental goodwill actually is
Goodwill is the value of a practice over and above its tangible assets. Strip out the chairs, the cabinetry, the imaging kit and the fit-out, and what remains is the reason a buyer pays a premium: an established patient base, a recognised name, a good location, a stable team and proven systems that keep producing income after the founder steps back. In a typical dental transaction goodwill is around 60 to 80% of the total price, with tangible assets making up the balance.
The distinction that matters most for tax and for deal structure is between two types of goodwill.
- Personal goodwill is tied to a specific dentist: their clinical reputation, their personal relationships with patients, and the loyalty those patients feel to that individual. It tends to leave with the dentist.
- Free goodwill (often called business or commercial goodwill) is attached to the practice as a going concern: the brand, the premises, the recall systems, the associate roster and the wider team. This is the goodwill that transfers to a buyer.
Buyers pay full value for free goodwill and discount heavily for personal goodwill, because personal goodwill is the bit at risk of walking out of the door. Much of deal structuring is really about converting personal goodwill into something that stays: a tied-in handover period, restrictive covenants on the seller, associate retention, and earn-out clauses that hold back part of the price until the patient base proves it has stuck.
How goodwill is valued
Most dental goodwill is valued on an earnings basis: normalised, or adjusted, EBITDA multiplied by a market multiple. EBITDA (earnings before interest, tax, depreciation and amortisation) is "normalised" by stripping out one-off costs and adjusting the owner's drawings to a true market rate of pay for the clinical work done, so the figure reflects the sustainable profit a buyer could expect to inherit. That normalised earnings figure is then multiplied by a market-derived multiple.
The multiple is a range, not a fixed number, and it moves with the risk profile of the practice. Practices that are private-focused, in high-demand areas, with stable associates and transferable systems sit at the top of the range. NHS-heavy, single-handed practices in lower-demand areas, where income depends on one person and on contract terms outside the owner's control, sit at the bottom. We deliberately do not publish a single headline multiple, because quoting one number tends to anchor a negotiation on the wrong figure. The honest position is that the multiple has to be argued from the specific practice, and a credible valuation shows its working.
Two other methods appear as cross-checks rather than primary tools. A turnover-percentage approach is quick but ignores profitability, so it can badly mislead on a high-revenue, low-margin practice. An asset-based approach backs into goodwill as the gap between total value and net tangible assets, which is useful for sense-checking but not for setting the price. The earnings multiple remains the anchor, and the factors that move it (patient retention, NHS and private mix, location, team stability and growth headroom) are exactly the points due diligence is there to test. Your NHS and private income mix is one of the strongest drivers, because private income usually attracts a higher multiple than NHS income tied to a contract.
How goodwill is taxed on the buying side
The buyer's tax position turns on two things: who is buying (a sole trader or partnership versus a limited company), and whether the deal is an asset purchase or a share purchase.
Sole traders and partnerships buying goodwill
For an unincorporated buyer, goodwill is capital expenditure. There is no annual income-tax relief for the cost of the goodwill itself. It instead forms part of the base cost that reduces the eventual capital gain when the practice is later sold. Relief, in other words, is deferred to the exit, not enjoyed along the way.
Companies buying goodwill: the intangibles regime
It is a common and expensive assumption that a company always gets to write down purchased goodwill against corporation tax. The corporate intangibles regime is far more restrictive than that, and the rules depend on when the goodwill was acquired.
| Date goodwill acquired | Corporation tax relief on the goodwill |
|---|---|
| Before 8 July 2015 | Relief generally available on amortisation under the rules in force at the time. |
| 8 July 2015 to 31 March 2019 | No relief on goodwill amortisation (relief withdrawn). |
| On or after 1 April 2019 | Fixed-rate relief of 6.5% a year, but only if the qualifying-IP condition is met, and capped at six times the qualifying-IP spend. |
The post-2019 relief is the one most buyers ask about, and the condition attached to it is the part most often missed. The 6.5% fixed-rate deduction applies only to relevant assets, including goodwill and customer relationships, that are acquired as part of a business acquisition which also includes qualifying intellectual property, and the relief is then capped at six times the qualifying-IP expenditure. A dental practice bought purely for its patient goodwill, with no qualifying IP changing hands alongside it, can therefore find that bare goodwill attracts no amortisation relief at all. A blanket "buy after April 2019 and you get 6.5%" is simply wrong. We cover the mechanics and the worked detail of this in our post-2019 goodwill amortisation guide.
A share purchase sidesteps this regime in one sense and inherits a problem in another. Buying the shares of the company that owns the practice means the goodwill stays inside the company at its existing tax base, so there is no fresh acquisition to amortise. The buyer takes the company with all its history, which is why share deals carry heavier due diligence and usually a price discount or warranty cover for hidden liabilities.
SDLT and stamp duty on the transfer
How the deal is structured also drives transfer taxes. On an asset purchase that includes the freehold premises, Stamp Duty Land Tax applies to the property element at the non-residential rates (England and Northern Ireland): 0% up to £150,000, 2% on the slice from £150,001 to £250,000, and 5% above £250,000. Goodwill and most loose equipment do not attract SDLT, which makes the price apportionment across the deal genuinely matter. On a share purchase, there is no SDLT on the underlying property because the property does not move; instead stamp duty on shares applies at 0.5% of the consideration for the shares. Getting the split between goodwill, equipment and property right is a tax exercise in its own right, explored in our goodwill and equipment apportionment guide.
How goodwill is taxed on the selling side
For the seller, goodwill sold on an asset sale produces a capital gain, charged to Capital Gains Tax. The main CGT rate is 24%, and the annual exempt amount is £3,000 for 2026/27, but the figure most sellers care about is Business Asset Disposal Relief.
Business Asset Disposal Relief and the April 2026 step
BADR applies a reduced CGT rate to qualifying gains up to a £1 million lifetime limit per individual. The rate is not static, and it is rising:
- 14% for qualifying disposals up to 5 April 2026.
- 18% for qualifying disposals from 6 April 2026.
The conditions must be met throughout the two-year period to the disposal. For a sole trader or partner selling the business, that means owning the trading business for the full two years. For a share sale of an incorporated practice, the seller must hold at least 5% of ordinary share capital and 5% of voting rights, be an officer or employee of the company, and have a 5% economic entitlement, all for the two years to sale. Because the relief is capped at £1 million over a lifetime, a sizeable practice can see the gain above that ceiling taxed at the full 24% rate. The step from 14% to 18% makes the timing of a 2025/26 disposal a live planning point, and there is more on that in our guide to timing a sale around the BADR rate rise.
Timing here is technical. For CGT, the date of disposal is the date of the contract, not completion, where the contract is unconditional. An unconditional exchange of contracts on or before 5 April 2026 can therefore lock in the 14% rate even if completion follows later. Where the contract is conditional, for example on the commissioner consenting to novate the NHS contract, the disposal date is the date that condition is satisfied, which can push the gain into the 18% band.
Earn-outs and deferred consideration
Many dental sales hold back part of the goodwill price as an earn-out, contingent on patient retention or future performance. This is sensible commercially but creates a tax trap. Where the deferred amount is unascertainable at the point of sale, the seller is treated as receiving, at completion, a separate chargeable asset: the right to that future payment (the principle from Marren v Ingles). CGT is charged twice. First on the valued right at disposal, then again when the right is satisfied and the cash arrives. The sting is that BADR generally does not reach that second disposal, because the right itself is not a qualifying business asset, so the earn-out element is usually taxed at the standard CGT rate rather than the BADR rate. If the eventual payment comes in lower than the value originally taxed, the loss can be carried back against the original gain. The full mechanics, including how loan notes and cash structuring change the position, are in our earn-outs and deferred consideration guide.
Goodwill on incorporation
A dentist who incorporates an existing unincorporated practice is, in effect, selling the practice (goodwill included) to their own new company. That transfer is a disposal for CGT and would normally crystallise a gain on the goodwill. Two reliefs commonly defer it. Incorporation relief rolls the gain on the whole business, transferred as a going concern wholly or partly for shares, into the base cost of those shares, where it sits until the shares are later sold (cash taken out instead of shares restricts the relief proportionately). Holdover relief on the gift of business assets is an alternative route where the structure does not fit incorporation relief cleanly. Incorporation is sometimes used deliberately ahead of a sale, so that a later share sale can be framed to access BADR, but the NHS pension consequences and the two-year clock both need careful handling well before any exit. Our dedicated incorporation relief guide walks through the conditions in detail.
The practical takeaway
Goodwill is rarely a single clean number with a single clean tax answer. The same practice can throw up a very different bill depending on whether it sells as assets or shares, whether the buyer is a company or an individual, when the contract is signed relative to 6 April 2026, and how any earn-out is drafted. The figures and reliefs above are the framework, not the advice. Anyone close to a transaction should model the actual numbers on both sides before committing, because the structure chosen at the start largely fixes the tax outcome at the end. If you are buying or selling and want the goodwill position modelled properly, get in touch for specialist dental accounting advice.