Planning the Sale of a UK Company: Tax Strategy for Business Owners

Selling a business is, for most entrepreneurs and business owners, the largest financial transaction of their lives. The tax treatment of the proceeds — and the difference between well-planned and poorly planned exits — can easily amount to hundreds of thousands of pounds. This guide covers the key tax considerations for UK company owners planning a disposal, from the relief available at sale to the reinvestment options that can shelter gains post-transaction.

The Landscape Before You Start

Tax planning for a business sale should ideally begin three to five years before the intended exit. Many of the most valuable reliefs and structuring opportunities require time to implement — share rearrangements, employee ownership trust contributions, share option scheme grants, and pre-sale reorganisations all require minimum holding periods and specific conditions to be satisfied. A vendor who approaches an adviser only when a buyer approaches them has already foregone a significant proportion of the available planning.

That said, even with limited lead time, meaningful tax planning is possible. The following sections work through the main considerations in sequence.

Business Asset Disposal Relief (BADR)

Business Asset Disposal Relief (formerly Entrepreneurs' Relief) provides a reduced capital gains tax (CGT) rate on qualifying gains, against the usual higher CGT rates (18% or 24% for higher rate taxpayers as at 2026 following the October 2024 Budget changes). The BADR rate has been increased in stages: it was 10% to 5 April 2025, rose to 14% for 2025/26, and rose again to 18% from 6 April 2026. For disposals in the 2026/27 tax year the BADR rate is therefore 18%. The lifetime limit is £1m per individual.

To qualify for BADR on a company sale, the seller must have:

• Held at least 5% of the company's ordinary share capital (by votes and economic interest) for a minimum of two years.
• Been an officer or employee of the company for the same two-year period.
• The company must be a "trading company" or the holding company of a "trading group" (investment activities must not constitute a substantial part of the business).

At the 18% BADR rate on the first £1m of gains (2026/27), BADR saves up to £60,000 compared with the 24% standard higher rate. The saving was considerably larger when the BADR rate was 10% (a saving of up to £140,000 against the 24% rate), but the relief has been progressively eroded by the increases to the BADR rate (10% to April 2025, 14% in 2025/26, 18% from April 2026). The relief remains worthwhile for many sellers but is a smaller benefit than it was, and the lifetime limit has also been cut repeatedly (it was £10m before 2020).

BADR is available per person. In family companies where multiple family members hold qualifying shares and are employed, BADR can be claimed by each qualifying individual, multiplying the total relief available. Ensuring that family shareholders meet the conditions — including the employment requirement — is an important part of pre-sale planning.

Earn-Outs: Tax Treatment

An earn-out is a mechanism where part of the sale proceeds are contingent on future performance of the business, typically paid one to three years after completion. Earn-outs are common in owner-managed business sales where there is disagreement between buyer and seller about future value, or where the seller continues to work in the business for a transition period.

The UK tax treatment of earn-outs is complex and depends on the structure:

Capital earn-out. Where the earn-out is structured as a right to receive future consideration related to the performance of the company (rather than for the seller's services), the earn-out right is itself a capital asset, with a market value ascribed to it at the date of sale. CGT is payable on the initial consideration plus the estimated value of the earn-out right at completion. When the earn-out is paid, an adjustment is made if the actual payment differs from the estimated value.

Employment earn-out. Where the earn-out is in substance a payment for the seller's continued services as an employee or consultant, it is characterised as employment income (subject to income tax and NICs) rather than capital. HMRC examines earn-out arrangements carefully and will re-characterise as employment income any payment that is conditional on the seller's continued employment or personal performance targets.

Loan notes. Earn-outs are sometimes structured as deferred cash or as loan notes (Qualifying Corporate Bonds or non-QCBs). The CGT treatment differs — a disposal in exchange for QCBs can trigger immediate CGT (though the gain is held over until the note is realised), while a disposal for non-QCB loan notes can defer the CGT until the notes are redeemed or sold. This area is highly technical and specialist advice is essential.

Deferred Consideration Structures

Where a buyer cannot pay the full consideration upfront, deferred consideration (as distinct from a conditional earn-out) may be used. Key considerations:

• Interest element. If deferred consideration does not carry market interest, HMRC may treat a deemed interest element as income to the seller.
• Security. Deferred consideration should be secured (e.g. on the business assets or by way of guarantee) where possible, to protect against default.
• CGT timing. Where consideration is deferred but unconditional (fixed amounts to be paid over time), the full gain is typically recognised on completion and CGT is due on the usual payment dates regardless of when cash is received. This creates a potential cash flow mismatch that must be planned for.
• Bad debt relief. If the buyer defaults and the deferred consideration is not paid, a claim for relief against the CGT previously paid may be possible in certain circumstances.

Management Incentive Plans and Proceeds

Where the company has EMI, CSOP, SAYE, or other share option schemes in place, sale proceeds attributable to those options must be handled carefully:

EMI options (Enterprise Management Incentives). Gains on disposal of shares acquired under a qualifying EMI option attract CGT (not income tax) and may qualify for BADR (at the 18% BADR rate for 2026/27) if holding conditions are met. The grant date counts towards the two-year qualifying period for BADR purposes (not just the exercise date).

Non-qualifying options. Options that do not meet the conditions for EMI, CSOP, or SAYE treatment are typically taxed as income on exercise (the spread between exercise price and market value at exercise), with CGT applying only to post-exercise gains. A sale at completion where options are exercised and shares immediately sold will result in both income tax/NIC and CGT charges.

Phantom share plans. Cash-settled phantom arrangements are straightforwardly employment income, subject to income tax and NICs in full.

Modelling the tax-effective "day one" and ongoing proceeds for key management is an important element of deal structuring, particularly where management are expected to roll equity into the new ownership structure.

Share Purchase Agreement (SPA) Warranties and Indemnities

A business sale is documented by a Share Purchase Agreement (SPA). From a tax perspective, the SPA's warranty and indemnity provisions are particularly important:

Tax warranties. The buyer will require extensive representations about the tax compliance position of the target company — all returns filed, all liabilities paid, no undisclosed investigations, no schemes disclosed under DOTAS, PAYE and NIC compliance, etc. Sellers should ensure they have reviewed these carefully with their tax advisers and that any known issues are disclosed in the disclosure letter.

Tax indemnity. The buyer will typically require a specific indemnity (pound-for-pound payment, without a financial threshold) against pre-completion tax liabilities that emerge post-sale. The scope of the indemnity, and any financial cap, is a negotiation between buyer and seller.

Warranty and Indemnity (W&I) Insurance. W&I insurance — purchased by either buyer or seller — covers losses arising from warranty breaches, reducing the seller's exposure from an escrowed retention to the insurance deductible. W&I insurance has become standard in larger transactions and can significantly reduce the seller's retained risk.

Retention. A cash retention held in escrow until the expiry of the warranty period (typically 12–24 months for general warranties, longer for tax) is an alternative or supplement to W&I insurance.

Post-Sale Reinvestment: EIS and SEIS

Following a business sale, a seller who has realised significant gains faces CGT on those gains at up to 24% (as at 2026). Reinvestment into qualifying shares under the Enterprise Investment Scheme (EIS) or Seed Enterprise Investment Scheme (SEIS) provides a CGT deferral and, potentially, income tax relief:

SEIS: 50% income tax relief on investments up to £200,000 per tax year in qualifying early-stage companies. SEIS shares must be held for three years. CGT exemption on disposal if shares are sold after the three-year period. SEIS deferral of gains from the disposal is not available (unlike EIS), but the 50% income tax relief can substantially reduce the after-tax cost of the investment.

EIS: 30% income tax relief on investments up to £1m per tax year (£2m if a substantial portion is in knowledge-intensive companies) in qualifying growth-stage companies. EIS shares must be held for three years. EIS Deferral Relief: CGT on a gain realised in the three years before, or one year after, an EIS subscription can be deferred until the EIS shares are disposed of. This allows a business vendor to defer the CGT on sale proceeds by reinvesting in EIS-qualifying companies.

EIS and SEIS investments carry significant investment risk — these are typically loss-making, early-stage businesses with high failure rates. The tax reliefs are generous precisely because the underlying investments are risky. Professional due diligence and diversification across a portfolio of EIS companies is important.

Timing Considerations

The tax year in which a sale completes can significantly affect the CGT liability:

• Annual exemption. Each individual has a CGT annual exempt amount (£3,000 as at 2026). Completing a sale in a year when the exemption has not yet been used maximises its benefit.
• Spouse/civil partner transfers. No-gain, no-loss transfers between spouses or civil partners before a sale can double the available BADR relief and annual exemptions.
• Investment losses. Crystallising investment losses in the same tax year as a business gain reduces the net chargeable gain.
• Pension contributions. Large one-off pension contributions in the year of sale can reduce adjusted net income and potentially affect other reliefs.
• End-of-tax-year timing. Completing shortly before 5 April versus shortly after can move the entire CGT liability into the following tax year, deferring payment by up to 22 months (depending on payment on account obligations).

How Global Investments Can Help

Global Investments advises business owners at every stage of the sale process — from pre-sale structuring and relief optimisation to post-sale investment planning. We work alongside specialist M&A solicitors, corporate tax advisers, and accountants to deliver a co-ordinated exit strategy that maximises after-tax proceeds. We also provide independent investment management for sale proceeds, integrating EIS/SEIS deferral strategies with longer-term wealth management objectives. Contact us well in advance of any planned sale to ensure we can add maximum value.

This guide is for information purposes only and does not constitute tax, legal, or investment advice. Tax rates, reliefs, and rules cited are as at June 2026 and are subject to change. EIS and SEIS investments carry a high risk of loss. Readers should obtain independent professional advice before making tax or investment decisions in connection with a business sale.