How to Negotiate Earn-Outs and Retained Equity

Negotiating the sale of your business is rarely straightforward, especially when buyers propose an earn-out or ask you to retain an equity stake. These mechanisms can help bridge valuation gaps, but they’re also riddled with pitfalls and misunderstandings—especially in the UK context. This guide gives you the insider’s view on how earn-outs and retained equity really work, how to maximise your outcome, and how to protect yourself both financially and legally. Whether you’re a first-time seller or a seasoned entrepreneur, you’ll finish this article equipped to negotiate with confidence and clarity.

When selling a UK business, particularly an SME, it’s rare to receive the entire purchase price upfront. Instead, many deals include an earn-out—where some of the price is paid later, depending on how the business performs post-sale. Alternatively, or in addition, you might be asked (or choose) to retain a minority equity stake in the business. Both structures help bridge the gap between what you think your business is worth and what the buyer is willing to pay now. But both are complex, and can go badly wrong if not negotiated carefully.

An earn-out is typically a contractual arrangement where an additional payment (or payments) is made to the seller if the business achieves agreed targets after completion. These targets are most often based on financial metrics—such as turnover, EBITDA, or gross profit over a set period (usually 1-3 years). Retained equity, on the other hand, involves you keeping a minority shareholding in the business post-sale, so you benefit from any future growth (and may also share new risks).

In the UK, earn-outs and retained equity are especially common in sectors like technology, professional services, and healthcare. They’re also a frequent feature in deals involving private equity or trade buyers who want to keep the seller involved. Both structures have tax implications, legal risks, and emotional consequences. Getting the details right is essential if you want to avoid nasty surprises.

Earn-outs can be highly bespoke, but most UK SME deals follow a common pattern. The buyer pays a portion of the price at completion. The rest is paid out over 1-3 years if (and only if) the business hits specific targets. These targets are often based on post-tax profit, EBITDA, or revenue, but can also be linked to client retention, new contracts won, or other KPIs.

The key issues to negotiate are the performance metrics, the period covered, and how the calculation will be made. For example, will the earn-out be paid if EBITDA exceeds £500,000 in each of the next two years? Or is it based on cumulative turnover over three years? The details matter—a lot. Seemingly small differences in wording can make or break your payout.

Risks abound: buyers may change the business model, allocate costs differently, or prioritise their own interests over maximising your earn-out. As the seller, you have limited control once you’ve handed over the keys. That’s why it’s common (and wise) to negotiate protections, such as a say in budgeting, or limits on cost allocations, during the earn-out period.

It’s also crucial to clarify what happens if you or key staff leave, or if the buyer sells the business again during the earn-out. Many earn-outs are conditional on the seller’s continued involvement, but you need clarity on what counts as ‘cause’ for termination and what happens if you’re forced out unfairly.

Retaining equity after a sale can be attractive: you get an immediate payday while keeping a stake in the business’s future upside. This is common when selling to private equity, or when the buyer wants you to stay on as a minority shareholder and help drive growth. But minority shareholders have limited control—and are vulnerable if the buyer’s interests diverge from yours.

As a minority shareholder (often 10-49%), you typically lose day-to-day operational control, but may retain specific rights—such as board representation, vetoes on major decisions, or pre-emption rights on future share issues. The value of your retained equity depends on the buyer’s stewardship of the business, and on the terms you negotiate at sale.

One key issue is liquidity: there’s rarely a guaranteed future exit for minority shareholders in UK SMEs. Unless the sale agreement includes a clear route for selling your shares—such as a put option, drag-along rights, or a commitment from the buyer to buy you out at a set price or formula—you could end up locked in indefinitely. Minority protection provisions are crucial, but so is realism about your future influence and exit options.

Tax is another major consideration. Depending on the structure, you may trigger capital gains tax (CGT) on the sale, but also face a further tax bill when you eventually sell your retained shares. Business Asset Disposal Relief (formerly Entrepreneurs’ Relief) may reduce the CGT rate to 10% (subject to a £1m lifetime limit), but conditions are strict. Always get specific, up-to-date advice from a tax specialist before agreeing terms.

• Retained equity is only valuable if you trust the new owners’ ability and incentives to grow the business.
• Your rights as a minority shareholder are set out in the shareholders’ agreement—scrutinise this carefully.
• Be wary of dilution—future investment rounds can reduce your percentage unless you have pre-emption rights.
• Tax planning is crucial—seek advice on both the sale and your future exit to avoid nasty surprises.

Negotiating an earn-out or retained equity deal requires more than just agreeing the headline numbers. The devil is in the detail. Set out your non-negotiables early, and never assume the buyer’s standard contract will protect you. Work with an experienced corporate solicitor and (ideally) an adviser who has negotiated similar deals in your sector.

For earn-outs, focus on the clarity and objectivity of the financial metrics, the fairness of the measurement, and your degree of influence over the business post-sale. For retained equity, prioritise exit rights, minority protections, and clarity on dividend policy and reporting. In both cases, be wary of vague language or clauses that give the buyer too much discretion.

Don’t underestimate the emotional side. Earn-outs often fail because trust breaks down or the seller feels excluded from key decisions. Structure the deal so your incentives align—and so you have clear recourse if the buyer acts against your interests. If you’re staying on as an employee or director, employment protections matter too—especially regarding dismissal ‘for cause’.

• Insist on detailed definitions for all earn-out metrics, ideally with worked examples.
• Negotiate information rights during the earn-out—regular access to management accounts and board minutes.
• Seek veto rights or consultation on major changes (e.g., budgets, strategy, key hires) during the earn-out period.
• For retained equity, require a clear buyout mechanism and tag-along rights if the majority owner sells.

Good faith alone is not enough. The right contract clauses are your safety net. Use your leverage pre-completion—after the sale, your bargaining power drops dramatically. Consider walking away if you can’t get sufficient protection; a smaller guaranteed sum may be preferable to a risky earn-out.

Tax can make or break the real value of any UK business sale. With earn-outs and retained equity, the picture is especially complex. The tax treatment depends on the exact structure, timing, and terms, and HMRC’s rules are detailed. Always get specialist advice before agreeing to any structure.

With earn-outs, the key question is when (and how) you are taxed on the deferred payments. HMRC usually treats the right to receive future earn-out payments as part of the consideration for your shares/business—even if the amount isn’t yet fixed. Usually, you’ll pay Capital Gains Tax (CGT) on the open market value of the earn-out right at completion, even though you haven’t received the cash yet. If the earn-out is paid in shares instead of cash, special rules ("paper for paper" provisions) may apply.

When you retain equity, you’ll usually pay CGT on the part you sell at completion (possibly qualifying for Business Asset Disposal Relief at 10%, if eligible). When you later dispose of your retained shares, you’ll face another CGT event, potentially at 10% (if you still qualify for the relief) or 20% (the standard rate for higher-rate taxpayers). The conditions are strict: you must have held at least 5% of the company’s shares and voting rights for at least two years before the sale, and been an officer or employee.

A common trap is the ‘double tax’ problem: if HMRC values your earn-out right generously at completion, you could pay significant CGT upfront, only to receive less (or nothing) if targets aren’t hit. There are reliefs for this (such as ‘earn-out protection’), but they must be structured correctly in the contract and reported to HMRC.

• Get a tax clearance from HMRC if your earn-out or equity structure is complex.
• Ensure your sale agreement clearly distinguishes between payment for shares and payment for post-sale services.
• Plan your tax payments—CGT can be due before you receive all the cash.
• Retained equity can jeopardise BADR eligibility if you cease to be an employee or director before your second sale.

Negotiating these structures is part art, part science. Here’s a detailed process to help you approach the negotiation with clarity and confidence, based on best practice in UK SME sales.

Many UK SME sellers make the same errors when agreeing to earn-outs and retained equity—often because they’re eager to close the deal or underestimate the complexity. Awareness is your best defence. Insist on thorough, realistic due diligence, and never rely on vague assurances from buyers or their advisers.

One frequent mistake is overestimating your ability to influence the business post-sale. Once you’ve sold, your legal rights matter far more than personal relationships. If you’re relying on an earn-out, you must have contractual rights to information and a role in key decisions—otherwise, you’re at the buyer’s mercy.

Another common error is failing to secure a clear exit route for retained equity. Without this, you could be stuck with illiquid, hard-to-value shares for years. Poor tax planning is another pitfall: if you don’t structure the deal carefully, you could face a large CGT bill before you receive the full sale proceeds, or lose out on valuable reliefs like BADR. And never forget employment law: if your earn-out depends on you staying employed, ensure your new contract isn’t easy to terminate ‘for cause’.

• Don’t agree to vague or poorly-defined earn-out metrics—insist on worked examples.
• Always negotiate a buyback or sale mechanism for retained equity.
• Get written confirmation of your rights during and after the earn-out period.
• Model cash flow and tax liabilities—don’t assume all sale proceeds arrive immediately.
• Check the buyer’s reputation—speak to other sellers who have dealt with them.
• Never sign before your solicitor and tax adviser have reviewed the deal.