How Do You Sell a Dental Practice Without Losing Half to Tax? A 12-Month Pre-Sale Checklist

Why Selling a Dental Practice Is a Capital Event, Not a Trading One

When you sell a dental practice, the profit is a capital gain, not trading income. That means it is subject to Capital Gains Tax (CGT), not income tax or National Insurance. The difference matters. A principal selling a practice worth £800,000 with a base cost of £200,000 faces a gain of £600,000. At the higher rate of CGT (24% for 2025/26), the tax bill could be £144,000. With Business Asset Disposal Relief (BADR) at 14%, that drops to £84,000. The saving of £60,000 depends on planning done well before the sale.

This article is a practical 12-month pre-sale checklist for UK dental practice principals. It covers the tax reliefs, timing decisions, and structural steps you need to take before you put the practice on the market. Every practice is different, so treat this as a starting point, not a substitute for professional advice from a dental-specialist accountant.

Step 1: Confirm Your Base Cost and Gather Documentation

Your capital gain is the sale price minus the base cost (what you paid for the practice, plus any subsequent capital improvements). Many principals underestimate their base cost because they have not kept records of capital expenditure. If you bought the practice 15 years ago for £150,000 and spent £100,000 on a surgery extension and new equipment, your base cost is £250,000, not £150,000.

Gather the following documents 12 months before you plan to sell:

• The original purchase contract and completion statement.
• Invoices for any capital improvements (building work, new chairs, X-ray units, compressors).
• Records of any Section 162 incorporation relief claimed when you transferred the practice into a company.
• Details of any goodwill purchased separately from the practice.

If you have lost paperwork, contact your accountant or the solicitor who handled the original purchase. HMRC will accept reasonable estimates if you can demonstrate the expenditure, but hard evidence is better.

Step 2: Review Your Practice Structure (Sole Trader, Partnership, or Limited Company)

The structure you trade through affects how the sale is taxed. A sole trader or partnership sells the practice as a disposal of the business itself. A limited company sells its shares (if you sell the company) or its assets (if you sell the trade and assets). Each route has different CGT treatment.

Sole trader or partnership: You sell the business assets (goodwill, equipment, premises). Goodwill is the main taxable element. You can claim BADR on the goodwill and on any qualifying assets, provided you have owned the business for at least two years and meet the trading condition.

Limited company: If you sell the shares, you get CGT treatment with BADR available on the shares (again, two-year holding period and trading condition). If the company sells its assets, the company pays corporation tax on the gain, and you then extract the proceeds as dividends or a capital distribution. That double layer of tax often makes a share sale more efficient, but it depends on the buyer's preference.

If you are a sole trader considering incorporation before sale, be careful. Incorporation can defer CGT via Section 162 relief, but it also resets your base cost. You may lose the ability to claim BADR on the original goodwill if you incorporate and then sell the company shares within two years. A practice valuation carried out before any restructuring will help you model the numbers.

Step 3: Maximise Business Asset Disposal Relief (BADR)

BADR is the most valuable relief for a dental practice sale. It taxes qualifying gains at 14% in 2025/26, rising to 18% from 6 April 2026. The lifetime limit is £1 million of gains. For a practice sale, that £1 million limit typically covers the goodwill element.

To qualify for BADR, you must meet these conditions:

• You have owned the business (or shares in the company) for at least two years up to the date of sale.
• The business is a trading business (a dental practice qualifies).
• If you are selling shares, you must be an employee or officer of the company and hold at least 5% of the shares and voting rights.

If you are close to the two-year mark, delay the sale until you hit it. Selling one month early could cost you tens of thousands. If you have already used some of your £1 million BADR lifetime limit on a previous sale, you need to track the remaining allowance.

For partnerships, each partner has their own £1 million limit. If you have two principals selling a practice worth £1.5 million, each can claim BADR on their share of the gain, up to their individual limit.

Step 4: Check Your NHS Pension Position Before Sale

Selling the practice may trigger a significant change in your NHS Pension Scheme contributions. If you are a principal and the practice is your main source of NHS pensionable earnings, the sale will end those contributions. That has two implications.

First, your final pensionable earnings in the 2015 CARE scheme are used to calculate your annual pension accrual. If you sell mid-year, your pensionable pay for that year may be lower than usual, reducing the pension you build up. You can sometimes mitigate this by deferring the sale to a new tax year or by ensuring your NHS contract continues until the sale completes.

Second, if you are over 55 and considering taking your NHS pension benefits, the timing of the sale matters. Taking pension benefits before the sale can affect your annual allowance and may interact with the tapered annual allowance if your total income (including the capital gain) pushes you over the threshold. The tapered annual allowance starts at £10,000 when adjusted income exceeds £260,000. A large capital gain can easily trigger that taper.

Speak to a dental-specialist accountant who understands the NHS Pension Scheme rules. The NHS Business Services Authority (NHSBSA) can also provide a pension forecast to help with timing decisions.

Step 5: Plan for the Buyer's Due Diligence

A buyer will conduct financial and legal due diligence on your practice. They will want to see three to five years of accounts, tax returns, NHS contract details, staff contracts, and equipment registers. If your records are incomplete, the buyer may reduce their offer or walk away.

Twelve months before sale, start organising:

• Full set of management accounts for the last three years.
• NHS contract schedules and UDA delivery records.
• Staff employment contracts and pension records.
• Equipment list with dates of purchase and capital allowance claims.
• Lease or freehold title documents.
• Any outstanding tax liabilities or HMRC enquiries.

A clean due diligence process speeds up the sale and protects your price. If you have unresolved tax issues (for example, an open HMRC enquiry into your associate's self-employment status), resolve them before you market the practice. Buyers will discount for uncertainty.

Step 6: Consider the Timing of the Sale

The tax year runs 6 April to 5 April. Selling in one tax year versus the next can affect your overall tax position. For example, if you sell in March 2026, the gain is taxed in 2025/26 at 14% (BADR) or 24% (standard higher rate). If you sell in May 2026, the gain is taxed in 2026/27 at 18% (BADR) or 24% (standard higher rate). The BADR rate increase from 14% to 18% from 6 April 2026 means selling before that date saves 4% on qualifying gains.

Also consider your personal income in the year of sale. If you have high practice profits plus a large capital gain, your total income may exceed £125,140, removing your personal allowance and potentially triggering the tapered annual allowance on your pension. You can sometimes manage this by defering some practice drawings or by selling in a year when your practice income is lower.

A practice valuation calculator can give you a rough estimate of the sale price, but the tax modelling requires a full financial projection. Do not rely on a single year's figures.

Step 7: Review Your Will and Estate Planning

If you die before the sale completes, the practice passes to your estate. The inheritance tax (IHT) position depends on whether the practice qualifies for Business Property Relief (BPR). A trading dental practice typically qualifies for 100% BPR, meaning it is exempt from IHT. But if you have already agreed a sale and the contract is unconditional, HMRC may argue that the asset is no longer a trading business but a right to proceeds, which does not qualify for BPR.

Review your will and consider a lasting power of attorney. If you become incapacitated during the sale process, your attorney needs authority to complete the transaction. This is a low-probability, high-impact risk that is easy to fix with a simple document.

Step 8: Engage a Dental-Specialist Accountant and Solicitor Early

The most common mistake principals make is leaving tax planning until the solicitor sends the completion statement. By then, the structure is fixed, and you have lost the ability to optimise. A dental-specialist accountant should be involved at least 12 months before you plan to list the practice.

Your accountant will:

• Model the CGT under different scenarios (share sale vs asset sale, BADR vs no BADR).
• Check your base cost and capital allowance pool.
• Advise on the timing of the sale relative to your pension and personal tax position.
• Prepare a tax clearance application if needed.

Your solicitor should have experience in dental practice sales. They will handle the contract, the NHS contract novation, and the transfer of the Performers' List obligations. A good solicitor and accountant working together can save you far more than their fees.

Summary: The 12-Month Pre-Sale Tax Checklist

Here is the condensed checklist to work through with your accountant:

• Confirm your base cost and gather all capital expenditure records.
• Review your trading structure (sole trader, partnership, or limited company).
• Ensure you meet the two-year holding period for BADR.
• Check your NHS Pension position and annual allowance.
• Organise due diligence documents for the buyer.
• Model the tax impact of selling in different tax years.
• Review your will and estate planning.
• Engage a dental-specialist accountant and solicitor at least 12 months before sale.

Selling a dental practice is a major financial event. With proper planning, you can keep more of the proceeds and avoid surprises. Start the process now, even if you are not sure when you will sell. The tax savings are worth the effort.

For a detailed walkthrough of the sale process, see our goodwill valuation and sale playbook. If you need help modelling your specific situation, contact our team of dental-specialist accountants.