Tax & Exit · Part of your exit plan
In short
Tax can materially affect the net proceeds and timing of a business exit, but it should not determine the commercial strategy in isolation. Owners should understand the likely tax consequences early, take specialist advice before binding decisions, and consider tax alongside valuation, buyer strategy, ownership structure, retirement objectives and exit readiness.
Written by Tony Vaughan
Published: · Last reviewed: · Editorial policy
An attractive headline price does not automatically equal what the owner ultimately keeps. The agreed price is first shaped by the structure: how much is paid at completion, how much is deferred or depends on an earn-out, and whether part is taken as retained equity or buyer shares. Tax is then charged on the gain, broadly proceeds less the allowable cost of the shares, at rates that depend on the owner's circumstances and any relief that applies.(HMRC) What reaches the owner, and when, is the net proceeds.
That is why tax belongs inside the exit plan from the start. Timing, structure and retirement objectives all move the net figure, and each is easier to influence early than once heads of terms are signed.
From headline price to net proceeds
Headline price
What the buyer agrees to pay
Structure
Cash, deferred, earn-out, retained
Gain
Proceeds less allowable cost
Tax
Rates, reliefs and timing
Net proceeds
What reaches you, and when
These are the subjects that most often come up when owners begin planning a sale or succession. Each needs to be considered for your own position; none has a general answer.
Capital Gains Tax
The main tax on most owner share sales; rates depend on the gain, the owner's income and any relief.
Business Asset Disposal Relief
An existing relief for qualifying owner-managers, with an announced lifetime limit change from April 2027.
Founders' Relief
A proposed relief for a narrow group of growth-company founders; not yet law.
Share ownership history
When and how shares were acquired, issued or transferred affects cost and qualifying periods.
Company trading status
Substantial non-trading activity, such as surplus cash or investments, can affect reliefs.
Holding periods
Many conditions must be met for a minimum period up to the date of disposal.
Spouse and family shareholdings
Each shareholder's position is assessed separately; transfers have their own consequences.
Deferred consideration and earn-outs
When proceeds are taxed and how uncertain amounts are treated can differ from when cash arrives.
Rollover and retained shares
Taking buyer shares or keeping a stake changes what is disposed of now and later.
Pre-sale restructuring
Reorganisations and demergers can help or harm and usually need clearances and time.
Residence and personal circumstances
Residence, other income and family plans all affect the outcome.
The two reliefs serve very different owners and are not interchangeable.
Existing relief · Limit change announced
BADR can reduce Capital Gains Tax to 18% on qualifying disposals by owner-managers. Changes announced for 6 April 2027 reduce the lifetime limit to £500,000, which may affect the relief some owners have available.
Read the BADR GuideProposal · Subject to consultation
The proposed Founders’ Relief offers a lower 10% CGT rate for a much narrower group of qualifying founders and early investors in qualifying growth companies. It is not yet law.
Read the Founders’ Relief GuideCurrent developments
Our Budget 2026 article sets out the current context: what was announced, when it is intended to apply and what it means for exit timing. The two guides above remain the main long-term reference pages and are updated as legislation progresses.
Read what Budget 2026 means for business exitsThe strongest exits start with the owner's objectives and a realistic view of value, then choose a route and structure. Tax advice tests and refines that structure; it rarely rescues a weak transaction.
Objectives
Why and when
Value
Realistic range
Route
Buyer or successor
Structure
Deal terms
Tax advice
Specialist review
Proceeds
What you keep
Exit
Transition
For most owners selling shares, Capital Gains Tax is the main consideration, together with whether any relief such as Business Asset Disposal Relief may apply. Deal structure, timing, family shareholdings, trading status and residence can all change the result. A qualified tax adviser should review the specific position.
Ideally two to three years before a likely sale, and certainly before agreeing heads of terms. Some reliefs depend on conditions being met for a period before the disposal, and restructuring takes time, so late advice can leave fewer options.
It can. Announced changes, such as the BADR lifetime limit falling from 6 April 2027, and holding-period conditions can make timing relevant. Tax timing should be weighed against business performance, buyer demand and personal readiness rather than drive the decision alone.
No. The gain is broadly the proceeds less the allowable cost of the shares and certain costs of sale. How deferred, contingent or share-based consideration is treated can also change when and how much is taxed.
Business Asset Disposal Relief can reduce the CGT rate on qualifying gains to 18%, up to a lifetime limit announced to fall to £500,000 from 6 April 2027. It is one input to the plan; whether a disposal qualifies must be confirmed by a tax adviser.
A proposed relief announced at Budget 2026: 10% CGT on up to £10m of lifetime qualifying gains for founders and early investors of high-growth companies meeting strict tests. It is not yet law and many established SMEs will not qualify.
Owners can be taxed on amounts before they are received, and uncertain future payments raise questions about valuation and timing. The treatment depends on how the consideration is drafted, so advice is needed before terms are agreed.
Yes, many deals include retained equity or rollover into buyer shares. These structures change what is disposed of now and later and can affect relief, so the tax and commercial consequences should be reviewed together.
General exit-planning information, not personalised tax advice. Qualification for any relief must be assessed by an appropriately qualified tax adviser.
Primary government sources only. Checked on 1 November 2026.
About this article
ExitPlanning.co.uk is operated by Exit Partners Limited and led by Tony Vaughan, who has more than 30 years' commercial experience, has worked on UK SME sell-side transactions since 2010 and has personally completed more than 150 SME business sales.
Where appropriate we draw on a wider network of experienced advisers, specialists and former business owners. This article is general commercial guidance, not legal, tax or regulated financial advice.