Selling a dental practice is one of the most significant financial events in a dentist’s career. The tax position on exit — specifically Capital Gains Tax (CGT) and the availability of Business Asset Disposal Relief (BADR) — directly determines how much of your sale proceeds you keep. For a practice selling at £500,000–£2 million, the difference between a well-structured and a poorly-structured exit can be £50,000–£200,000 in additional tax.
This guide explains how CGT applies to dental practice sales, how BADR works and what the April 2026 rate change means for dental sellers, how earn-outs are taxed, and the key planning actions to take before going to market.
This guide provides general information only. It is not tax advice. Before completing any transaction you should take advice from a qualified tax adviser with experience in dental practice sales.
Asset Sale vs Share Sale: The Starting Point
The first question in any dental practice tax analysis is whether the transaction is structured as an asset sale or a share sale. The structure determines who pays CGT, at what rate, and on what base cost.
Asset sale
The buyer acquires the individual assets of the practice — goodwill, equipment, patient list, NHS contract rights, property (or the lease). The seller is typically the dental practice company (if incorporated) or the individual practitioner (if unincorporated).
For an incorporated practice selling assets, there is a potential double tax charge: the company pays corporation tax on the gain from the asset disposal, and then the proceeds must be extracted — either as dividends (taxed at up to 33.75% or 39.35%) or through a Members’ Voluntary Liquidation (MVL) process, which triggers CGT at the individual level on the distributions received.
For an unincorporated practice (sole trader or partnership), the individual or partners pay CGT directly on the gain from selling the business assets.
Share sale
The buyer acquires the shares in the dental company. Only the shareholders pay CGT — on the difference between the sale price of the shares and their base cost (typically the original subscription price). There is no corporation tax event at company level, and no double charge.
Share sales are generally more tax-efficient for the seller. However, buyers often prefer asset sales because they can claim capital allowances on the purchased assets and avoid inheriting the company’s historic liabilities. The deal structure is a negotiation point, and the tax premium a seller needs to remain whole on an asset deal is a factor in that negotiation.
Capital Gains Tax on a Dental Practice Sale
CGT applies to the gain on sale — the difference between the sale price and your allowable costs (the base cost of the assets or shares, plus qualifying sale costs such as legal fees and brokers’ fees).
Current CGT rates (2025/26 and 2026/27)
For most business asset disposals (including dental practice shares and assets):
- Basic rate taxpayer: 18%
- Higher / additional rate taxpayer: 24%
Most dental practice sellers are higher-rate taxpayers, so the standard CGT rate on a dental sale is 24% — unless BADR applies (see below).
The annual CGT exempt amount is currently £3,000 per person for 2025/26. This is a small concession on the scale of most dental sales.
Business Asset Disposal Relief (BADR)
BADR (formerly Entrepreneurs’ Relief) is the most important tax concession available to dental practice sellers. It reduces the CGT rate on qualifying gains to a significantly lower rate — allowing dentists who qualify to pay substantially less tax on their exit proceeds.
BADR rates and the April 2026 deadline
| Disposal date | BADR rate |
|---|---|
| Before 6 April 2025 | 10% |
| 6 April 2025 – 5 April 2026 | 14% |
| On or after 6 April 2026 | 18% |
The BADR rate has increased twice following the Autumn Budget 2024 and will reach 18% from 6 April 2026 — the same as the higher-rate CGT rate for non-qualifying disposals. The lifetime limit of qualifying gains per individual remains at £1 million.
The practical impact: A dental practice seller with a £750,000 qualifying gain completing before 6 April 2026 pays £105,000 in CGT (14%). The same gain completing on or after 6 April 2026 costs £135,000 (18%) — an additional £30,000. For gains near or at the £1 million lifetime limit, the difference is £40,000.
Given that a typical dental practice sale takes 9–15 months from instructing a broker to completion, sellers targeting the April 2026 deadline would need to have been in active sale discussions since mid-2025.
BADR qualifying conditions for dental practice sellers
To claim BADR on a dental practice sale, you must meet all of the following conditions, assessed at the date of disposal:
For a share sale (the most common structure):
- Trading company: The dental company must be a trading company (or the holding company of a trading group) — not an investment company
- Employment or office: You must be an employee or officer (director) of the company
- 5% shareholding: You must hold at least 5% of the ordinary share capital and at least 5% of the voting rights in the company
- 2-year holding period: All of the above conditions must have been met throughout the 2 years ending on the date of disposal
For an asset sale (unincorporated practice):
- You must be disposing of the whole or part of a business (not just individual assets)
- You must have owned the business for at least 2 years ending on the date of disposal
Common issues that can prevent BADR:
- A shareholder who has dropped below 5% due to share dilution in the 2 years before sale (e.g., new shares issued to associates or investors)
- A practice that has been holding surplus cash or investments for some time — HMRC may challenge whether it remained a “trading company” if non-trading assets were substantial
- Goodwill transferred from a sole trader to a company in which the seller is a connected person — BADR cannot apply to that goodwill gain (a specific restriction introduced in 2014)
- Failure to maintain the officer/employment condition continuously for the 2-year period
BADR is claimed on the self-assessment tax return for the tax year in which the disposal occurs. The tax is due on 31 January following the end of the tax year of disposal.
Earn-Outs and Deferred Consideration
Earn-outs are common in dental practice sales, particularly in NHS contract acquisitions where the buyer wants protection against patient retention and contract performance in the period after completion. Understanding how earn-outs are taxed is essential for sellers negotiating deal structures.
What is an earn-out?
An earn-out (or deferred contingent consideration) is a portion of the sale price that is paid after completion, conditional on the practice achieving certain performance metrics — typically NHS UDA delivery, revenue, EBITDA, or patient numbers — over a defined period (usually 12–24 months).
CGT treatment of earn-outs
The tax treatment depends on whether the earn-out amount is ascertainable or unascertainable at the time of sale:
Ascertainable consideration: If the earn-out amount can be calculated at completion (e.g., it is the balance of a fixed price held in escrow), it is treated as part of the initial disposal proceeds and taxed in the year of sale.
Unascertainable consideration: If the amount is genuinely contingent (it depends on future performance that cannot be reliably valued at completion), HMRC treats the right to receive the earn-out as an asset in its own right. The value of that right at the date of completion is included in the disposal proceeds — taxed in the year of sale. When the earn-out is actually received (in cash or further shares), any difference from the valuation is a separate CGT event.
In practice, most dental earn-outs are treated as unascertainable, and the right to receive them is given a market value at completion (often the net present value of the expected receipts, discounted for performance risk).
BADR and earn-outs
BADR can apply to the earn-out, but only if the qualifying conditions were met at the time of the original disposal. The relief is determined at the date you sell the shares or business — not when the earn-out is received. You do not need to still be employed or hold 5% at the time earn-out payments come in (because you have already sold).
However, if the earn-out creates a new CGT event (i.e., the actual receipts exceed the value attributed to the earn-out right at completion), that additional gain is taxed separately — and whether BADR applies to it depends on specific HMRC rules around the disposal of the earn-out right itself.
Section 138A election (loan notes): Where a buyer offers loan notes rather than cash for an earn-out, a s138A TCGA 1992 election can defer the CGT until the loan notes are redeemed. This is a common structure in corporate dental acquisitions where buyers are incorporated. The election must be made within 2 years of the end of the tax year of disposal.
Earn-outs treated as income
HMRC may challenge whether part of an earn-out is employment income rather than capital proceeds — particularly where the seller is retained as a clinician during the earn-out period and payments are tied to personal performance. If characterised as income, payments are subject to income tax and National Insurance at marginal rates (up to 47%), rather than CGT at 14–24%. Deal documentation should clearly characterise earn-out payments as consideration for the business, not remuneration for post-sale services.
Other CGT Reliefs Relevant to Dental Sales
Rollover Relief
Where a dentist sells a dental practice and reinvests the proceeds into a qualifying replacement business asset within 3 years (or 1 year before the disposal), Rollover Relief can defer the CGT charge. This is relevant where a dentist is exiting one practice and acquiring another — the gain from the first disposal can be “rolled over” into the base cost of the new asset.
Gift Relief
Where a dental practice is transferred to a family member (or business partner) for less than market value, Gift Relief can defer the CGT by reducing the transferee’s base cost. This is primarily relevant in succession or family transfer scenarios rather than commercial sales.
Holdover Relief (incorporated practices)
On incorporation of an unincorporated dental practice, Incorporation Relief can defer CGT by treating the gain as a reduction in the base cost of the shares received. This is relevant for dentists currently operating as sole traders who are considering incorporating prior to a sale. Note: from 6 April 2026, Incorporation Relief must be claimed — it is no longer given automatically.
Worked Example: Dental Practice Share Sale
Dr Smith sells 100% of the shares in her dental company on 31 January 2026 (i.e., before 6 April 2026). The agreed price is:
- Completion payment: £900,000
- Earn-out (contingent on NHS UDA delivery over 12 months): valued at £150,000 at completion
Total disposal proceeds attributed at completion: £1,050,000
Base cost of shares: £1,000 (subscription price)
Total gain: £1,049,000
Dr Smith claims BADR on £1,000,000 (the lifetime limit). The remaining £49,000 is taxed at the standard higher-rate CGT of 24%.
| Gain | Rate | Tax |
|---|---|---|
| £1,000,000 (BADR) | 14% | £140,000 |
| £49,000 (standard CGT) | 24% | £11,760 |
| Total tax | £151,760 |
If the same sale completed after 6 April 2026 (with BADR at 18%):
| Gain | Rate | Tax |
|---|---|---|
| £1,000,000 (BADR) | 18% | £180,000 |
| £49,000 (standard CGT) | 24% | £11,760 |
| Total tax | £191,760 |
The April 2026 rate change costs Dr Smith an additional £40,000 in CGT on the same sale.
Key Tax Planning Actions Before Going to Market
- Confirm your BADR qualifying status early. Verify that you have held at least 5% of ordinary shares and have been an employee or director continuously for 2 years. Check whether any share issuances (to associates or business partners) have diluted you below the threshold.
- Assess the trading company test. If your practice holds significant cash, investments, or non-trading property, take advice on whether this could affect BADR eligibility. Consider distributing excess cash before a sale process begins.
- Understand the earn-out tax position before negotiating it. The split between headline price, deferred certain consideration, and contingent earn-out has real tax consequences. Model the post-tax outcome for different structures before agreeing heads of terms.
- Review the asset vs share sale question with your solicitor and accountant. Buyers often prefer asset deals; sellers usually prefer share deals. The tax premium to compensate for an asset deal (to put you in the same after-tax position as a share sale) should be calculated before you agree a structure.
- Factor in timing if you are near the BADR rate change. The April 2026 increase from 14% to 18% is a meaningful financial event for any seller within 12 months of readiness. Work backwards from your target completion date to assess whether the timing risk is material for you.
- Take specialist tax advice early. BADR conditions are technical and HMRC scrutinises claims carefully. Errors in the qualification analysis can result in losing the relief entirely on disposals worth hundreds of thousands of pounds.
What to Do Next
The first practical step for any dental practice owner considering a sale is a confidential valuation — to understand your current market value, the likely deal structure, and the tax position you would be in on completion. This gives you the information you need to make a genuinely informed decision about timing and structure, and to plan your pre-sale tax position with the benefit of real numbers.
Get a free confidential dental practice valuation →
For background on how dental practices are valued, see how dental practices are valued. For the full sale process from first approach to completion, see our guide to selling a dental practice.
Frequently Asked Questions
Do I pay CGT when I sell my dental practice?
Yes, unless you have no gain (i.e., you sell for less than your base cost). The gain is taxed at 18% (basic rate) or 24% (higher rate) — unless you qualify for Business Asset Disposal Relief (BADR), which reduces the rate to 14% (or 18% from April 2026). Most dental sellers are higher-rate taxpayers, so planning to access BADR is the primary tax priority on a sale.
Does BADR apply to a dental practice sale?
BADR can apply if you meet the qualifying conditions — principally holding at least 5% of the shares and being an employee or director continuously for 2 years before the sale. BADR does not apply automatically: you must meet all the conditions and claim it on your self-assessment tax return. The lifetime limit is £1 million of qualifying gains per individual.
What is the BADR rate in 2025/26?
The BADR rate is 14% for qualifying disposals made between 6 April 2025 and 5 April 2026. It rises to 18% from 6 April 2026. This compares to standard higher-rate CGT of 24% on the same gains without BADR.
How are earn-outs taxed when selling a dental practice?
Earn-outs are treated as part of the sale consideration. If the amount is contingent and cannot be ascertained at completion, the right to receive the earn-out is valued at completion and that value is included in the disposal proceeds for CGT purposes. When payments are actually received, any difference from the initial valuation is a further CGT event. BADR can apply to the earn-out right valued at completion, provided the qualifying conditions were met at the time of the original disposal.
Is it better to sell assets or shares when selling a dental practice?
For the seller, a share sale is usually more tax-efficient because it avoids the double-tax charge that can arise in an asset sale from an incorporated company (corporation tax on the company’s gain, then further tax on extracting the proceeds). However, buyers often prefer asset deals as they can claim capital allowances and avoid inheriting company liabilities. The tax differential is a negotiation point — sellers should understand their post-tax position under both structures before agreeing heads of terms.
When is CGT due after selling a dental practice?
CGT on disposal gains is reported on your self-assessment tax return for the tax year of disposal and payment is due on 31 January following the end of that tax year. For example, a disposal completing on 31 January 2026 falls in the 2025/26 tax year; the CGT is due and payable on 31 January 2027.