What Is an Earn-Out and How Does It Work in a UK Business Sale?
An earn-out is a portion of your sale price that you only receive if the business hits agreed financial targets after completion — typically over one to three years. It bridges the gap between what a buyer is willing to pay now and what you believe the business is worth. Earn-outs are common in UK mid-market deals, and they can work well — but they come with real risks that sellers consistently underestimate.
Table of Contents
- What is an earn-out in a UK business sale?
- Why do buyers propose earn-outs?
- How are earn-outs structured?
- What are the real risks for sellers?
- What legal protections must sellers insist on?
- When should you accept an earn-out — and when should you resist?
- Related reading
- FAQ
What is an earn-out in a UK business sale?
When a business is sold, the total consideration is rarely a single number paid in cash on day one. An earn-out is the deferred portion of that consideration — money you receive later, conditional on the business performing to an agreed standard after the sale completes.
For example: a buyer agrees to pay £6m upfront for your business, with up to £2m more payable if EBITDA exceeds £1.2m in each of the next two years. That additional £2m is the earn-out. If the targets are not met, you may receive nothing — or a reduced amount depending on how the deal is structured.
Earn-outs are not the same as deferred consideration. Deferred consideration is a fixed sum paid later with no performance condition attached. An earn-out is contingent. That distinction matters significantly when you are assessing deal value.
Why do buyers propose earn-outs?
Buyers propose earn-outs for straightforward commercial reasons:
- Valuation gap. The buyer and seller cannot agree on a number. The earn-out allows both parties to say yes without either fully conceding the argument.
- Seller dependency. If the business depends heavily on your relationships or expertise, a buyer wants you financially motivated to stay and protect those relationships post-completion.
- De-risking the acquisition. If your most recent trading year was unusually strong — perhaps due to a one-off contract or post-pandemic recovery — a buyer will want evidence that performance is repeatable before paying full price.
- Protecting return on investment. Private equity-style thinking has permeated trade buyers too. Earn-outs allow buyers to fund part of the acquisition from the business's own future profits.
None of these reasons are unreasonable. The difficulty is that what works commercially for the buyer may not work for you.
How are earn-outs structured?
Earn-outs vary considerably in their construction. The key variables are:
What metric is used?
| Metric | Pros for Seller | Risks for Seller |
|---|---|---|
| Revenue | Harder for a buyer to manipulate; simpler to measure | Doesn't reflect profitability; costs may be loaded post-completion |
| EBITDA | Aligns with how the business was valued | Buyer controls many cost decisions post-completion |
| Gross profit | Middle ground; less exposed to overhead manipulation | Still requires clear accounting policy definitions |
| Net profit | Directly reflects business health | Most exposed to accounting decisions and cost allocation |
Revenue-based earn-outs are generally more seller-friendly. EBITDA-based earn-outs are more common but carry greater risk of dispute because EBITDA is affected by decisions the buyer controls — staffing levels, management charges, IT systems, marketing spend.
Single year or cumulative?
A single-year target resets each year. A cumulative target measures total performance across the earn-out period. Cumulative structures are typically fairer to sellers, as a strong year can compensate for a weaker one.
Ratchet mechanisms
A ratchet earn-out pays out on a sliding scale rather than a binary pass/fail. If you hit 90% of the target, you receive 90% of the earn-out. This is almost always preferable to a cliff-edge structure where missing the threshold by a small margin costs you the entire amount.
Typical UK earn-out structures in mid-market deals:
| Earn-out Length | Most Common Sectors | Typical Proportion of Total Consideration |
|---|---|---|
| 1 year | Professional services, recruitment | 10–20% |
| 2 years | Manufacturing, healthcare services | 15–30% |
| 3 years | Construction, business services | 20–40% |
What are the real risks for sellers?
You need to go into an earn-out with your eyes open. The risks are real, and they are frequently underplayed at the heads of terms stage.
You are working for the buyer. Post-completion, the business belongs to the buyer. You may retain an operational role, but strategic decisions are theirs. If the buyer makes decisions that harm performance — cutting the marketing budget, loading in head office overhead, or changing your pricing model — your earn-out suffers.
Disputes are common. The British legal system has seen a significant body of litigation specifically around earn-out calculations. Disputes often centre on accounting treatment, what costs can be allocated to the business, and whether the buyer took actions that prevented the targets being hit.
Targets can be harder to hit than they appear. The uncertainty and disruption that naturally follows any acquisition — staff unsettlement, customer uncertainty, systems integration — can depress short-term performance even without bad faith from the buyer.
Some buyers actively manage against earn-out targets. This does happen. A buyer who has paid a lower upfront price has a financial incentive to ensure the earn-out is not triggered. Actions that might achieve this include loading in new costs, redirecting contracts, or delaying investment that would drive growth. Legitimate protection against this requires specific contractual language, not goodwill.
What legal protections must sellers insist on?
If you are accepting an earn-out, the following protections are not optional. Make sure they are agreed before heads of terms are signed and reflected in the sale and purchase agreement (SPA).
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Defined accounting policies. Agree in writing — at the SPA stage — exactly how earn-out metrics will be calculated. What is included in EBITDA? How are shared costs allocated? How are management charges treated? Ambiguity here benefits only the buyer.
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Non-interference covenants. The buyer must be contractually restricted from taking actions that would materially damage your ability to hit the earn-out targets — for example, removing key staff, changing pricing without consent, or diverting contracts elsewhere.
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Operational autonomy rights. During the earn-out period, you should retain meaningful control over the day-to-day decisions that affect the earn-out metric. Define clearly which decisions require your approval.
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Information rights. You must have the right to see regular management accounts during the earn-out period — monthly is standard — and to audit earn-out calculations independently.
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Dispute resolution mechanism. Agree an expert determination process (typically a named category of independent accountant) to resolve earn-out calculation disputes without requiring full litigation. Include timelines for this process.
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Accelerator clauses. If the business is sold on again during your earn-out period, your earn-out should either accelerate and become payable in full, or be protected in the new transaction. Without this, a subsequent sale can make your earn-out worthless.
When should you accept an earn-out — and when should you resist?
Earn-outs can be acceptable when:
- The upfront payment alone represents a satisfactory outcome for you
- You are staying in an operational role and genuinely control the earn-out metric
- The earn-out is revenue-based with a ratchet, and the protections above are in place
- The earn-out period is short (12–18 months) with clearly measurable targets
Resist an earn-out, or insist on stronger protections, when:
- The business is being integrated into a larger group (you will lose operational control)
- The earn-out metric is EBITDA and the buyer will control cost decisions
- There is no ratchet — it is a binary pass/fail on a single target
- The buyer is reluctant to include non-interference covenants (this tells you something)
- You are being asked to stay on in a reduced or undefined role
The broader principle: an earn-out should never be the only path to a satisfactory outcome. If the upfront payment alone does not represent acceptable value, the earn-out is not filling a gap — it is hiding a problem with the deal.
This article contains general information only and does not constitute financial or tax advice. Every business sale is different. Speak to a qualified UK tax adviser about your specific situation before making any decisions.
Related reading
If you are assessing how earn-out provisions fit into the broader deal framework, it is worth understanding how these terms are first committed to paper. See our guides on Heads of Terms Explained and How to Negotiate Heads of Terms — the earn-out structure agreed at HoTs stage is very difficult to unpick later in the process.
FAQ
Are earn-outs taxed differently in the UK? Earn-out payments are generally treated as additional sale proceeds and subject to Capital Gains Tax in the year they are received. The interaction with Business Asset Disposal Relief (BADR) can be complex — particularly where the earn-out spans multiple tax years. Take specific advice from a UK tax adviser before agreeing any earn-out structure.
How long do earn-outs typically last in UK deals? Most mid-market earn-outs run for one to three years post-completion. Anything beyond three years is unusual and should be approached with significant caution — the longer the period, the greater your exposure to external factors outside your control.
Can I negotiate an earn-out out of the deal entirely? Yes, and it is a legitimate negotiating position. A buyer who insists on an earn-out is sharing risk with you — which means they should also share upside. If you have strong, clean financials and a repeatable earnings track record, you have grounds to resist a substantial earn-out or negotiate it down significantly.
What happens to my earn-out if the business is sold again? Without specific contractual protection, very little. If the acquiring business is sold or merged during your earn-out period, your earn-out can effectively be nullified. Insist on an accelerator clause that triggers full payment on any subsequent change of control.
What is the difference between an earn-out and deferred consideration? Deferred consideration is a fixed sum payable at a future date regardless of performance — it is essentially certain. An earn-out is contingent on hitting targets. Both are common in UK M&A, but they carry very different risk profiles for the seller.
Is an earn-out common in management buyouts (MBOs)? Less so. In an MBO, the sellers are often stepping back entirely and the management team buying the business will not want to be penalised for their own performance. Earn-outs are more common in trade sales and strategic acquisitions where the buyer wants the selling founder to remain engaged.
Use our free valuation calculator at Succession Group to get a realistic view of what your business is worth today — and how different deal structures, including earn-outs, affect your actual proceeds.