An earn-out is a deal structure where part of the sale price is paid after completion only if the business meets agreed future performance targets. It can bridge a valuation gap between buyer and seller, but it must be drafted with precision — earn-outs are one of the most common sources of post-completion dispute in business sales.
Quick Answer: What is an earn-out?
An earn-out is a mechanism in a business sale agreement where the seller receives part of the purchase price after completion, conditional on the business achieving agreed performance targets during a defined period.
For example, a buyer might pay £300,000 upfront on completion and agree to pay up to a further £100,000 if the business achieves a specified EBITDA target in the twelve months following completion. If the target is not met, the earn-out payment is reduced or may not be paid at all.
Earn-outs are typically used when buyer and seller cannot agree on what the business is currently worth — often because the seller believes growth or a key contract will materialise, while the buyer wants to see that happen before paying for it. The earn-out allows both parties to proceed: the seller gets an upfront payment and the chance to earn more; the buyer limits their risk by tying part of the price to future proof.
Earn-outs sound logical in principle. In practice, they are complex, they frequently generate disputes, and they keep the buyer and seller financially connected — and sometimes commercially entangled — well after completion. They require very precise legal drafting and tax advice on both sides.
Contents
How an earn-out works
An earn-out divides the total consideration for a business into two parts:
The upfront paymentis made on completion. This is the amount the seller receives immediately and is not contingent on anything happening after the sale. It is the floor of the seller's proceeds.
The earn-out paymentis made later — typically six to twenty-four months after completion — but only if agreed performance conditions are satisfied. This is the element that bridges the gap between what the buyer is confident the business is worth today and what the seller believes it will be worth once certain future events materialise.
A simple illustration:
Upfront on completion - £300,000 - Unconditional
Earn-out tranche 1 - £50,000 - If EBITDA exceeds £120,000 in Year 1
Earn-out tranche 2 - £50,000 - If EBITDA exceeds £150,000 in Year 1
Maximum total price-£400,000- If all targets are met
If the business achieves EBITDA of £130,000 in Year 1, the seller receives the first tranche (£50,000) but not the second, giving a total price of £350,000. If EBITDA falls below £120,000, only the upfront £300,000 is paid.
The earn-out mechanism effectively says: the seller thinks the business is worth £400,000; the buyer is only confident it is worth £300,000. So they agree that the difference will be paid if and when the seller's prediction proves correct.
This sounds elegant. The complication is that after completion, the buyer runs the business — and the seller has limited influence over whether the targets are met. That dynamic creates significant tension and requires careful legal drafting to manage.
Why buyers use earn-outs
From the buyer's perspective, an earn-out is a tool for managing valuation risk. Buyers typically reach for earn-out structures in situations where they are uncertain about whether the business's claimed or projected performance will materialise.
Common scenarios where buyers propose earn-outs:
The business has recently grown rapidlyand the seller is asking for a price that reflects that growth continuing. The buyer wants proof before paying for the full trajectory.
There is significant owner dependency.The buyer is concerned that the seller's personal relationships and skills are driving a large proportion of the revenue, and that a portion of customers will leave when the seller departs. An earn-out that depends on customer retention directly addresses this risk.
A key contract is up for renewal.The buyer values the business at one level if the contract renews and at a significantly lower level if it does not. An earn-out tied to the renewal outcome can bridge this gap.
Revenue is based on a pipeline that has not yet converted.The seller is presenting a forward order book or sales pipeline as justification for a higher valuation. The buyer wants to see that pipeline convert before paying for it.
The business has limited trading history.A young business may have very strong recent performance but insufficient track record to justify a full earnings multiple. An earn-out can allow the buyer to pay a lower upfront price while giving the seller the opportunity to earn more once the track record is established.
The asking price is at the top of the buyer's rangeand a full upfront payment would create unacceptable debt or cash flow pressure. The earn-out allows the buyer to pay a lower upfront amount while giving the seller a route to their preferred total.
Earn-outs are not without cost for buyers. They create accounting complexity, an ongoing financial relationship with the seller, potential disputes over the earn-out calculation, and sometimes restrictions on how the buyer can manage the business during the earn-out period.
Why sellers accept earn-outs
Sellers tend to prefer clean, full cash payments. An earn-out means the seller receives less upfront, waits for the remaining amount, and bears the risk that the targets may not be hit — despite the business's strong performance under the seller's management.
So why do sellers agree to earn-outs?
The earn-out increases the potential total price.If the seller genuinely believes the business will perform strongly after completion, the earn-out gives them a route to a higher total consideration than the buyer would otherwise agree to pay upfront.
It bridges a genuine valuation disagreement.If the seller and buyer are £80,000 apart on price and cannot agree, an earn-out can allow both sides to proceed — the seller gets the upfront amount they need immediately, with the opportunity to close the gap through performance.
It keeps the deal alive.A deal that would otherwise collapse over a valuation dispute can sometimes be saved by introducing an earn-out. For a seller who wants to exit, this may be preferable to starting a new sales process.
It demonstrates confidence.A seller who agrees to an earn-out is effectively backing their own claims about the business's future. For some sellers, this is a matter of principle — they believe the business is worth what they say, and they are willing to prove it.
It supports the handover.An earn-out often involves the seller remaining involved in the business in some capacity — as a consultant, part-time director or employed manager — during the earn-out period. For sellers who want a gradual transition rather than an immediate clean break, this can be attractive.
The fundamental risk for sellers is that after completion, the buyer controls the business. Even if the seller's projections were accurate, decisions made by the buyer — cutting marketing, changing pricing, losing key staff, integrating the business into a larger group — can prevent the earn-out targets from being met through no fault of the seller.
This is why earn-out protections — buyer obligations, accounting definitions, information rights and dispute resolution provisions — are so important from the seller's perspective.
Common earn-out targets
The choice of earn-out target is one of the most important decisions in structuring the mechanism. The target should be objective, measurable by reference to defined accounting policies, and as difficult as possible to manipulate by either party.
Revenue
Revenue targets are simple to understand and relatively straightforward to measure. They are most useful where the value being paid for is the scale of the customer base rather than the profitability.
The risk for sellers is that a buyer who is focused on a revenue earn-out might chase sales at weak margins — boosting the top line but damaging the business's economics. Revenue targets also do not protect sellers from a buyer who increases costs significantly, reducing profitability while meeting the revenue threshold.
Gross profit
Gross profit targets — revenue minus direct cost of sales — are more informative than revenue alone. They protect sellers against margin erosion from high-volume, low-quality revenue.
The accounting definition of what counts as cost of sales needs to be specified precisely to avoid disputes.
EBITDA or adjusted EBITDA
EBITDA-based earn-outs focus on underlying profitability and are very common in more sophisticated business sales. The advantage is that they measure what actually generates returns — profit, not just sales.
The disadvantage is that EBITDA can be influenced by accounting policy decisions — for example, whether certain costs are capitalised or expensed, how depreciation is treated, which costs are classified as overhead versus exceptional, and what management charges (from a parent company, for example) are allocated to the business.
If the earn-out is EBITDA-based, the agreement must specify precisely how EBITDA is calculated, what add-backs (if any) apply, and whether the buyer is permitted to allocate new costs to the business during the earn-out period.
Customer retention
Customer retention targets are particularly useful where the key risk in a business acquisition is that customers will leave when the seller departs. A retention earn-out pays the seller based on how many of the existing customers (by number or by revenue) are still active at the end of the earn-out period.
The definition of "active" must be precise. Is a customer who reduced their spend by 50% still retained? What about one who paused their contract and returned? Does a new customer from the same group count as retention of the original customer relationship?
Contract renewal
Where the valuation gap is specifically driven by a major contract that is pending renewal, an earn-out tied to the renewal outcome is a natural solution. Either the contract renews — and the seller receives the additional payment — or it does not.
The definition of "renewal" matters. If the contract renews on materially different terms, does it count? What if the customer takes a shorter contract? What if the relationship continues informally without a signed document?
Milestones
For technology businesses, SaaS companies and project-based businesses, earn-outs based on specific operational milestones — a product launch, a regulatory approval, achieving a specified number of subscribers, or completing a key project — can be more appropriate than financial metrics.
Milestones need to be binary and objective. A milestone that depends on subjective assessment of quality or completeness will generate disputes.
Main risks for sellers
Earn-outs carry significant risk for sellers. The core problem is simple: after completion, the seller no longer controls the business, but their earn-out payment depends on how the business performs under the buyer's management.
The buyer changes strategy.A buyer who decides to reposition the business, enter new markets or exit existing ones may make decisions that are rational from a long-term perspective but that prevent the earn-out targets from being met in the short term.
The buyer cuts marketing or investment.Reducing spend on customer acquisition, brand or product development may improve short-term profitability metrics but damage the business's growth trajectory and prevent revenue earn-out targets from being met.
The buyer allocates new costs.In an integrated business or group structure, the buyer may allocate shared service costs — management fees, IT costs, finance overhead — to the acquired business, reducing its reported EBITDA and making the earn-out targets harder to reach.
The buyer changes accounting policies.If the earn-out is not precisely defined, the buyer has scope to influence the outcome through accounting choices — how costs are classified, how revenue is recognised, which items are treated as exceptional.
The buyer loses key staff.If the earn-out depends on the business's performance, but the buyer's management style or culture causes key revenue-generating staff to leave, the seller bears the consequences.
The earn-out period is too long.The longer the earn-out, the longer the seller remains financially exposed to decisions they no longer control. Market conditions change, and the further into the future the earn-out extends, the harder it is to link outcomes clearly to the state of the business at the time of sale.
Disputes over the calculation.Even with clear drafting, earn-out calculations can give rise to disputes. Both sides have incentives — the buyer to minimise the payment, the seller to maximise it — and these incentives can create conflict over borderline items.
Sellers considering an earn-out should take specific legal advice on how to protect themselves through buyer obligations, information rights, restrictions on how the business can be managed during the earn-out period, and dispute resolution mechanisms.
Main risks for buyers
Earn-outs can also create problems for buyers, though the risks are different from those facing the seller.
The seller remains too involved.If the seller is working in the business during the earn-out period — as a consultant or employee — they may resist changes the buyer wants to make, particularly if those changes could affect the earn-out outcome. This can create management conflicts and slow down integration.
The seller focuses on short-term targets at the expense of the long term.A seller who is incentivised to hit a one-year EBITDA target may push for decisions — cutting investment, accepting low-quality customers, delaying necessary spending — that maximise the short-term number but damage the business's longer-term position.
The earn-out liability creates accounting complexity.The buyer must track the earn-out obligation through their accounts, potentially on a fair-value basis. If the business performs differently to initial expectations, the earn-out liability may need to be marked up or down, affecting the buyer's reported results.
The earn-out amount becomes uncertain.If the earn-out is structured in tranches with multiple thresholds, the total financial liability is uncertain until the measurement period is complete. This uncertainty can complicate the buyer's financial planning.
Integration is delayed.During the earn-out period, the buyer may be constrained — either contractually or practically — from making changes to the business that would affect the earn-out metrics. This can delay strategic decisions and integration with other parts of the buyer's business.
Legal disputes are expensive.Earn-out disputes are disproportionately common and disproportionately expensive relative to the size of the transaction. Even when the earn-out amount is relatively modest, the legal cost of disputing it can be significant.
What should be written clearly?
The earn-out agreement must be precise. Ambiguity in any of the following areas is likely to lead to disputes.
The target metric.Precisely which measure will be used — revenue, gross profit, EBITDA, customer numbers, contract value? If EBITDA, what is the definition — EBITDA before or after management charges, before or after specific cost categories?
The accounting policies.Which accounting standard applies? Who prepares the earn-out accounts? What happens if the accounting policies used during the earn-out period differ from those used in the historical accounts that formed the basis of the valuation?
The measurement period.Exactly when does the earn-out period begin and end? Is it twelve months from the completion date? The next full financial year?
The calculation method.How is the final earn-out amount calculated from the achieved metric? Is it linear (£1 for every £1 of EBITDA above the threshold), binary (full amount if the threshold is met, nothing if it is not) or tiered?
The cap.What is the maximum earn-out payment the seller can receive?
The minimum threshold.Is there a minimum performance level below which no earn-out is paid at all?
The payment date and process.How long after the measurement period ends does the buyer have to produce the earn-out accounts? How long does the seller have to review them? What is the dispute process if they disagree?
Information rights.What financial information is the seller entitled to receive during the earn-out period — monthly management accounts, quarterly reports, access to the financial records?
Buyer obligations.What restrictions apply to the buyer's management of the business during the earn-out period? Can the buyer change the pricing structure? Can they allocate new management charges? Can they transfer employees out of the business? Can they merge the business with another operation?
Seller involvement.Is the seller employed or consulting during the earn-out? What are their obligations and remuneration? What happens if the relationship breaks down?
Change of control.If the buyer sells the business to a third party during the earn-out period, what happens to the outstanding earn-out obligation?
Tax treatment.What is the capital gains treatment of the earn-out — is it fully taxable in the year of completion, or as payments are received? This has significant implications for both seller and buyer.
The most important test for any earn-out agreement is:
Could the buyer and the seller independently calculate the earn-out payment using only the agreement and the available financial records, and reach the same answer?
If not, the agreement is not precise enough.
Earn-out example
To illustrate how the structure works and where it can go wrong:
A seller owns a B2B professional services firm. They want £500,000. The buyer believes the business is worth £400,000 because the firm's largest client — representing 30% of revenue — is due to renew its contract in six months and the outcome is uncertain. They agree the following structure:
Upfront payment - £380,000
Earn-out maximum - £120,000
Earn-out target - Key client contract renewed AND annual EBITDA of £110,000 or more in Year 1
Measurement period - 12 months following completion
Earn-out accounts - Prepared by buyer's accountant within 60 days of period end
Seller review - 30 days to review; disputes referred to independent accountant
Seller involvement - 6-month paid consultancy, £60,000 per annum pro rata
Information rights - Monthly management accounts within 15 business days
Buyer restrictions - Cannot allocate new group charges to the business, cannot change pricing policy without seller consent, cannot reduce headcount during earn-out period without written reason
Payment - Within 30 days of agreed earn-out accounts
Tax - Earn-out treated as capital receipt; seller to take separate advice on annual basis
This structure could work if it is drafted precisely and the parties respect it. It could fail if the EBITDA definition is vague, the buyer changes the accounting policies during the year, or the dispute process breaks down.
Earn-out checklist
Seller checklist
Upfront payment clearly understood — amount paid on completion unconditionally
Maximum earn-out amount clearly stated and capped
Target metric defined precisely — revenue, EBITDA, retention, milestone?
Accounting policies specified and consistent with historical accounts
Measurement period — exact start and end date confirmed
Buyer obligations during earn-out reviewed and documented — what can and cannot be changed
Information rights secured — regular access to management accounts and records
Dispute resolution process agreed — independent accountant or arbitration?
Seller involvement during earn-out confirmed — role, remuneration, duration
Change of control clause reviewed — what happens if the buyer sells during earn-out?
Tax advice taken on the timing and treatment of earn-out receipts
Legal advice taken on the full earn-out provisions before signing
Earn-out is not treated as guaranteed income
Buyer checklist
Earn-out target is objective, measurable and not easily manipulated
Accounting definition is precise and agreed
Buyer's management freedom during earn-out is adequately preserved
Earn-out liability is capped and the maximum amount is financially manageable
Seller involvement during earn-out is clearly defined — what authority do they have?
Accounting and audit process is clearly set out — who prepares, who reviews
Payment timeline is workable from a cash flow perspective
Dispute process is clear and proportionate
Integration plans during earn-out period are reviewed against any restrictions
Legal advice taken on the full earn-out provisions
Tax treatment understood
FAQs
Is an earn-out guaranteed money for the seller?
No. The earn-out payment is conditional on agreed targets being met. If the business underperforms — for any reason — the seller may receive less than the maximum earn-out, or nothing from the earn-out at all. Sellers should not treat the earn-out as a certain component of their total proceeds.
Why do buyers like earn-outs?
Earn-outs allow the buyer to limit their upfront financial exposure by tying part of the price to future proof of performance. They protect the buyer against paying a full premium for growth or contracts that may not materialise.
Why do sellers sometimes dislike earn-outs?
The seller may no longer control the business after completion, but their remaining payment depends on decisions the buyer makes. This creates a fundamental misalignment of control and financial interest, and is the root cause of most earn-out disputes.
What is the best earn-out target to use?
The best target is one that is objective, measurable by reference to clearly defined financial records, difficult to manipulate by either party, directly related to the value being paid for, and capable of being calculated independently by both sides with the same answer. EBITDA can work well if precisely defined. Revenue is simpler but says nothing about profitability. Customer retention is useful where the key risk is client departure.
How long should an earn-out period last?
Shorter is usually better for both parties. Twelve months is common. Two years introduces more uncertainty and keeps the buyer-seller relationship active for longer than either side may find comfortable. Very short periods — six months or less — can create perverse incentives to maximise short-term performance at the expense of longer-term health.
Is an earn-out the same as deferred consideration?
No. Deferred consideration is a fixed amount paid at a future date, regardless of performance. An earn-out is conditional — the amount paid depends on what the business achieves. Some agreements use these terms loosely, which is why reading the actual drafting rather than relying on labels matters.
Do earn-outs require legal and tax advice?
Yes, always. Earn-out provisions are technically complex and the tax treatment — particularly Capital Gains Tax timing — can have very significant financial implications for sellers. The legal drafting of the target metric, accounting policies, buyer obligations, information rights and dispute resolution must be precise. Both parties should be separately advised.
Key takeaways
An earn-out links part of the sale price to future performance— it is paid after completion only if agreed targets are met.
It can bridge a valuation gapwhen buyer and seller disagree on what the business is currently worth versus what it may become.
It is not guaranteed income for the seller.If targets are missed, the earn-out payment is reduced or lost.
Earn-outs frequently generate disputesbecause buyer and seller have conflicting interests in the outcome once the business has changed hands.
The target metric, accounting policies and buyer obligations must be defined precisely.Vague earn-out agreements create arguments.
Information rights matter.Sellers must retain the ability to verify the earn-out calculation independently.
Shorter periods are generally better.The longer the earn-out, the more uncertain the outcome and the longer the buyer-seller relationship remains entangled.
Tax advice is essential.The timing of earn-out receipts has real capital gains implications that need to be planned for.
Always use a solicitor with business sale experience.Earn-outs are one of the most technically demanding elements of any business sale agreement.
Related resources
Important disclaimer
Buy a Business Ltd is a marketplace, not a broker, corporate finance adviser, M&A adviser, law firm, accountant, tax adviser, lender, valuation firm, surveyor, insolvency practitioner or investment adviser. Information, guides, checklists, templates and examples on this site are for general guidance only and do not constitute legal, tax, financial, investment, lending, valuation, brokerage or regulated advice.
Buying or selling a business involves risk. You should seek independent professional advice before buying, selling, valuing, financing or completing a business purchase.
Sources and useful references
ICAEW: Earn-out agreements and transaction guidance
ICAEW: Financial due diligence guidance
GOV.UK: Business Asset Disposal Relief
GOV.UK: Capital Gains Tax — guidance for business disposals