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Tax when you sell your accountancy practice

When you sell your own firm, the structure and timing of the deal decide how much of the price you keep after tax.

Practice Group14 min read · Updated Jul 2026

Decisions that change your net proceeds

  • Asset sale vs share sale — model the tax on both.
  • Confirm Business Asset Disposal Relief eligibility against the current rules and limit.
  • Understand how deferred and contingent consideration is taxed.
  • Consider timing across tax years, and review family shareholdings early.
Contents
  1. Asset sale or share sale
  2. Business Asset Disposal Relief (BADR)
  3. How deferred and contingent consideration is taxed
  4. Timing, pensions and family shareholdings
  5. VAT, WIP and the finer points
  6. Do the tax analysis before heads of terms
  7. Where to start
  8. Questions

As an accountant you already know the basic Capital Gains Tax rules. The decisions that change your net proceeds are easy to leave too late and expensive to get wrong, and they need to be made before you agree terms. This is general information and is not tax advice. Rates and reliefs change, and the right answer depends on your circumstances — take your own written tax advice before you sign heads of terms.

Asset sale or share sale

If you trade through a limited company, this decision shapes the rest of the deal. The two routes transfer different things, carry different risk, and are taxed very differently — and buyers and sellers often prefer opposite ones.

 Share saleTrade & asset sale
What transfersThe company, wholeGoodwill, WIP, client relationships
Usually preferred bySellersBuyers
Seller taxed onGain on the shares (CGT)Company receives proceeds; extracting them is a second taxable step
Buyer inheritsHistory, contracts and liabilitiesA clean slate
Typical frictionMore buyer diligence on liabilities"Double extraction" for the seller

The double-extraction point on an asset sale — the company pays tax on the disposal, then you pay again to get the cash out as dividend or on winding up — is one reason to model the tax on both routes before committing. A sole practitioner sells the trade and assets by definition; the share-vs-asset question is a limited-company issue.

Business Asset Disposal Relief (BADR)

BADR can materially reduce the Capital Gains Tax rate on qualifying gains, up to a lifetime limit. Check the current rate and limit, because both have changed in recent years, and eligibility is not automatic. It depends on factors such as your qualifying period of ownership, your shareholding and voting rights, your officer or employee status, and the business being a trading business throughout. Structuring a deal — for example bringing in new shareholders, or the timing of a disposal — without first checking the BADR conditions against the current rules can lose the relief on part or all of the gain. Check your position early, in writing.

How deferred and contingent consideration is taxed

When part of the price is paid after completion, the tax treatment of the later payments needs care. The key distinction is whether the future amount is ascertainable (fixed, just paid later) or unascertainable (contingent — e.g. a retention-based earn-out):

This is why the structure agreed in the heads of terms and the tax analysis have to be joined up — see earn-outs and deferred consideration for the commercial side.

Timing, pensions and family shareholdings

Several established planning points can change the outcome, and each needs to be in place before a deal is on the table:

VAT, WIP and the finer points

Depending on structure, a sale may qualify as a transfer of a going concern (TOGC) for VAT, changing whether VAT is charged on the deal; confirm this with your adviser. The treatment of work-in-progress and debtors at completion, and any apportionment of consideration between goodwill and other assets, also affect the numbers and should be set out precisely in the agreement.

Do the tax analysis before heads of terms

The costliest mistake is leaving the tax analysis until the deal is agreed. By then the structure is largely fixed, the planning windows may have closed, and you're negotiating from a weaker position. Model asset-vs-share, confirm BADR, and settle the deferred-consideration treatment before heads of terms, so the commercial deal and the tax deal are designed together. Judge any offer on what you will receive after tax.

Where to start

Begin with a realistic valuation so you know the shape of the deal, then get your own adviser to model the structures and confirm reliefs before you agree terms.

Frequently asked questions

Andy Jackson
Andy JacksonCo-founder, Practice Group

Ask your own question →

Should I do an asset sale or a share sale?

If you trade through a company, model both. A share sale is usually more tax-efficient for the seller (one CGT charge on the shares), while buyers often prefer an asset sale for a clean slate — which can trigger 'double extraction' tax for you. A sole practitioner sells the trade and assets by default.

Will I qualify for Business Asset Disposal Relief when I sell?

Possibly, but it isn't automatic. BADR depends on conditions such as your qualifying ownership period, shareholding and voting rights, officer/employee status and the business being a trading business — and both the rate and lifetime limit have changed recently. Confirm your position against the current rules, in writing, before structuring the deal.

How is an earn-out taxed when I sell my practice?

It depends on whether the amount is ascertainable (fixed) or unascertainable (contingent). Contingent consideration is generally valued at completion as a separate chargeable asset, with a further gain or loss when received — so you can end up paying tax on value you don't ultimately get. Take advice before agreeing an earn-out.

Can I reduce the tax by planning ahead?

Often, yes — through timing a disposal across tax years, pension contributions, and reviewing family shareholdings. These need to be genuine and put in place well before a sale, with time to take advice on each one. This is general information and is not tax advice.

Talk to us about deal structure

Book a confidential call with the buyer to discuss how a sale of your practice would be structured, so your adviser can model the tax before you agree terms.

Book a confidential call
Andy Jackson, co-founder

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