Most owners treat the day heads of terms are signed as the finish line. The number is agreed, hands are shaken, and the sale feels done. It is not. The headline price is a statement of intent, not a payment. What you actually walk away with is decided in the weeks and months that follow — in how the earn-out is structured, what you warrant to be true about the business, what the disclosure letter protects, and how much of the money is held back until conditions are met. An owner who understands the headline number but not this second half of the deal can sign a strong price and receive a weak one.
This guide covers the part of a sale that begins after heads of terms and runs past completion: earn-outs and the traps inside them, your exposure under warranties and indemnities, the disclosure letter as your single most important protection, escrow and retention, deferred consideration, and what it means to stay on after you have sold. It is written for owners of UK businesses turning over roughly £1m to £100m, and it is framed from the seller's side of the table — the practical "should I accept this" lens, not the buyer's.
The first thing to internalise is that the price on the heads of terms and the cash that reaches your account are rarely the same figure. Between them sit a set of mechanisms — deferred payments, performance conditions, holdbacks, and potential clawbacks — that a buyer uses to shift risk from themselves onto you. Every one of them is negotiable. None of them is automatic.
A buyer's logic is straightforward. They are paying for a stream of earnings they believe will continue, and for assets they believe will transfer. Until they can see that both have survived the change of ownership, they would rather not part with all the cash. So they defer part of it, tie part of it to future performance, and hold part of it back against the risk that something you told them turns out to be untrue. Understanding each of these before you sign is the difference between negotiating the structure and simply accepting it.
The headline price is a ceiling, not a promise. Deferred consideration, an earn-out and a warranty claim can each pull the number you actually receive well below it. Negotiate the structure with the same seriousness you brought to the price — because the structure is where the price is quietly decided.
The mechanics of all this are settled in the sale and purchase agreement, the long-form contract that supersedes the heads of terms and governs everything that follows. By the time you are negotiating the agreement, the price is largely fixed. What remains in play is how — and how certainly — you get paid.
An earn-out ties part of the sale price to the business hitting agreed targets after completion. Instead of paying the full amount up front, the buyer pays a base figure at completion and a further, conditional amount if the business performs to plan over a defined period — typically one to three years.
Earn-outs exist because they bridge a gap in belief. You think the business is worth more than the buyer will pay in cash today; the buyer is willing to pay it, but only if the performance you promise actually materialises. The earn-out lets both sides bank the disagreement: you get the chance to earn the higher number, the buyer only pays it if the results arrive.
The metric an earn-out is measured against matters more than almost anything else in the deal, because it determines how much control you keep over your own outcome.
| Structure | Measured against | Seller's exposure |
|---|---|---|
| Revenue-based | Top-line turnover over the earn-out period | Lower risk of manipulation, but rewards volume the buyer may not want |
| Profit / EBITDA-based | Normalised earnings over the period | Highest risk — the buyer controls the costs that determine profit |
| Milestone-based | Specific events (a contract renewal, a product launch, a headcount target) | Cleaner to measure, but binary — you hit it or you do not |
| Retention-based | Named customers or key staff staying on | Depends on relationships you may no longer control post-sale |
Revenue-based earn-outs are the hardest for a buyer to game, because turnover is difficult to suppress without damaging the business they now own. Profit-based earn-outs are the most dangerous for a seller, because the buyer controls the cost base — and every pound of new central overhead, management charge or reallocated cost they push into your business reduces the profit your earn-out is measured against.
The figures above are ranges, not rules — every deal is negotiated on its own facts. But they frame the exposure. If half your consideration is riding on an EBITDA target for three years, and you no longer control the cost base that determines EBITDA, you have accepted a great deal of risk for a number you cannot fully influence.
An earn-out is not inherently a bad deal. A well-structured one lets a confident seller capture upside the buyer would not pay in cash. A poorly structured one hands the buyer a legitimate route to pay you less. The difference is in the detail, and the detail is where sellers get caught.
The two traps that cost sellers the most are metric gaming and loss of control. Once you sell, the buyer decides how the business is run — which staff stay, what costs are allocated to it, whether it is integrated into a larger group. If your earn-out is measured on profit and the buyer loads it with group overhead, restructures the sales team, or diverts a key customer to another part of the business, your target moves out of reach through decisions you cannot veto. Never accept a profit-based earn-out without contractual protections over how the business is run during the earn-out period.
The protections that make an earn-out survivable are specific and worth naming. The first is a set of ring-fencing covenants: written commitments that the business will be run in the ordinary course during the earn-out period, that group costs will not be arbitrarily allocated to it, and that the buyer will not take actions whose main purpose is to depress the earn-out. The second is clarity on the accounting: the exact definition of the metric, agreed accounting policies, and a dispute mechanism if you and the buyer disagree on the final figure. The third is your own role — whether you have enough operational authority during the period to actually influence the target you are being measured against.
There is a broader point behind all three. An earn-out only works when the thing being measured is transferable and evidenced. If the business depends on your personal relationships, an earn-out that hinges on retaining those customers is a trap you build for yourself. This is why the work of documenting your intangible assets — the customer contracts, the processes, the team that runs the business without you — is not just about defending the headline multiple. It is about being able to accept an earn-out with confidence, because the performance it measures does not walk out of the door when you step back.
Alongside the price, you will be asked to make a long list of statements about the business — that the accounts are accurate, that there is no undisclosed litigation, that the company owns the assets it claims to, that it complies with the law. These are warranties and indemnities, and they are the buyer's protection against nasty surprises after they have paid.
The distinction between the two matters. A warranty is a statement of fact; if it turns out to be untrue and the buyer suffers a loss as a result, they can claim damages — but they generally have to prove the breach caused the loss and quantify it. An indemnity is a promise to reimburse the buyer pound-for-pound for a specific, identified risk; it is a stronger, more direct remedy, and buyers push for indemnities on the risks that worry them most, such as a known tax exposure or a live dispute.
Warranty exposure is where sellers most often underestimate their liability. When you sign the sale and purchase agreement, you are personally standing behind dozens of statements about a business you may no longer own. If any of them is materially wrong, you can be pursued for it — sometimes years after completion.
The one thing you must negotiate hard on is the ceiling on your exposure. A warranty regime without proper limits is a liability with no floor.
| Limit | What it caps | What a well-advised seller secures |
|---|---|---|
| Cap | Maximum total liability across all claims | Ideally the consideration actually received, often lower |
| Time limit | How long the buyer can bring a claim | 12–24 months for general warranties; longer only for tax |
| De minimis | Minimum size before a single claim counts | Small claims excluded so you are not nickel-and-dimed |
| Basket / threshold | Aggregate floor before any claim can be made | Claims only proceed once total loss passes a threshold |
Without these limits, a seller can face open-ended exposure long after the money has been spent. The cap, the time limit and the thresholds are not boilerplate — they are the boundary of your risk, and they are negotiated line by line.
Here is the mechanism most sellers do not fully appreciate until their adviser explains it. You cannot be sued for a warranty being untrue if you told the buyer the truth before they signed. That is what the disclosure letter does: it sets out, against each warranty, the facts that qualify or contradict it. Anything properly disclosed cannot later form the basis of a warranty claim.
The disclosure letter is the seller's shield, not an administrative formality. Every known issue — the customer threatening to leave, the historic tax question, the dispute with a supplier, the software licence that is not quite watertight — should be disclosed against the relevant warranty. What you disclose, you cannot be sued for. What you leave out, you carry. A thorough disclosure letter is the cheapest insurance in the whole transaction.
The discipline this demands is the same discipline that wins a good price in the first place. A seller who has already catalogued their assets, contracts and risks — who knows exactly what the business owns, what it depends on, and where the soft spots are — can build a comprehensive disclosure letter quickly and defensibly. A seller who has not done that work is disclosing under time pressure during diligence, when omissions are most likely and most costly. The evidence you gather to defend your valuation is the same evidence that protects you under warranty.
This is where preparation before going to market pays a second dividend. The intangible assets a buyer values — the customer relationships, the owned intellectual property, the documented processes — are also the subjects of the warranties you will give. If you have identified and evidenced them in advance, you warrant them from a position of knowledge. If you have not, you are warranting statements about assets you have never properly examined.
Even after the price, the warranties and the earn-out are settled, a buyer will often want to hold back cash. There are three main ways they do it, and each shifts a different risk onto the seller.
A portion of the price is held by a third party (or retained by the buyer) for a set period as security against warranty claims. If no valid claim arises, the money is released to you. If one does, the buyer draws against it first. It is your cash, held back — and worth capping tightly.
Part of the fixed price is paid in instalments after completion rather than in a single sum. Unlike an earn-out, it is not conditional on performance — but it is only as safe as the buyer's ability to pay, so the covenant strength of the buyer matters.
The conditional portion, tied to future performance as discussed above. The riskiest of the three for a seller, because both payment and amount depend on results you may not fully control.
An escrow account protects the buyer, but you should negotiate its size and duration as hard as any other term. A retention of 10% of the price for 12 months against general warranty claims is common; a retention of 30% for three years is a different proposition entirely, and one to resist. Deferred consideration carries counterparty risk — if the buyer's business fails before the instalments are paid, you may join the queue of creditors — so understanding who is actually paying you, and whether the deferred amount is secured or guaranteed, is essential.
There is a related mechanism worth flagging. Where a deal uses completion accounts rather than a fixed "locked box" price, the final consideration is adjusted after completion based on the actual working capital and net debt in the business on the day it changed hands. A seller who runs the working capital down before completion, or misjudges the target, can see the price adjusted downward. It is another reason the number on the heads of terms is a starting point, not a settled figure.
An owner sold for a headline £8m: £5m in cash at completion, £1.5m of deferred consideration over two years, £1m of earn-out on an EBITDA target, and a 10% escrow against warranties. On paper, £8m. In practice, the earn-out delivered £600,000 because the buyer's group overhead was allocated into the business — a risk a ring-fencing covenant would have prevented. The deferred consideration and escrow paid in full because the disclosure letter had been thorough and no warranty claim arose. The difference between the headline and the outcome was structure, not price.
Many sales require the owner to stay on — for a handover period, or for the full length of an earn-out. This is not incidental to the deal; it is often central to it, because the buyer is trying to transfer the knowledge and relationships that walk out of the door when a founder leaves.
Staying on well is its own negotiation. Three things are worth settling before you sign. The first is your role and authority: are you running the business, advising it, or watching it be run by someone else while your earn-out depends on the result? The second is the terms of your service agreement — remuneration, notice, and what happens if the relationship breaks down. The third is the interaction between your employment and your earn-out: if you can be dismissed and thereby lose the influence needed to hit your target, the earn-out is worth less than it looks.
There is also a personal dimension the legal documents do not capture. You will be an employee in a business you used to own, working to someone else's plan, watching decisions made that you would have made differently. Some founders thrive on the handover; others find it corrosive. Being honest with yourself about which you are is part of deciding whether the deal structure — and the length of time it ties you in — is one you can live with.
A change of control also triggers consequences elsewhere: customer contracts with change-of-control clauses, key-person insurance, supplier agreements, and financing arrangements may all be affected the moment ownership transfers. Identifying these before completion — rather than discovering them during the buyer's diligence — is part of the same evidence discipline that protects you under warranty and defends your price.
Reduce the whole of the post-heads-of-terms deal to a single practical test and it comes down to control and evidence. Accept an earn-out when you retain enough operational authority to influence the target, when the metric is one the buyer cannot easily manipulate, when ring-fencing covenants protect the business from cost-loading, and when the performance being measured rests on transferable, documented assets rather than on your personal presence. Be wary of one when any of those conditions is missing — most of all when your consideration is tied to a profit figure the buyer controls and you do not.
The through-line from the first page to the last is preparation. The evidence that wins a strong headline price — a clear picture of what the business owns, what it depends on, and how it runs without you — is the same evidence that lets you accept an earn-out with confidence, build a disclosure letter that shields you, and negotiate warranty limits from knowledge rather than hope. The owners who get the best outcome are not the ones who negotiate hardest at completion. They are the ones who arrived at the table already knowing exactly what they were selling.
Opagio Intangibles identifies and evidences your intangible assets across Opagio 12, values them with recognised methods, and produces the Opagio Value Drivers Register™ and a Normalised P&L — the documents that let you disclose comprehensively, warrant from knowledge, and accept an earn-out with your eyes open. See what a buyer's diligence will find — book a demo of Opagio Intangibles.
The headline price is agreed at heads of terms. What you keep is decided afterwards — in the earn-out structure and its traps, in the warranties you give and the disclosure letter that protects you, in the escrow and deferred consideration that hold cash back, and in the terms on which you stay. Each of these shifts risk between buyer and seller, and each is negotiable. The seller who understands them keeps more of the number on the front page.
If you are working toward a sale, start with the sell-side hub for the wider journey, and read the business sale process step by step for how the earlier stages fit together. For a fuller picture of the deal shape, see how to sell your business over 24 months and, on the structure that governs your tax and liability, share sale versus asset sale in the UK. For common questions, see how do I sell my business. When you are ready to build the evidence that protects you through completion and beyond, book a demo of Opagio Intangibles or see the product in detail.
Ivan Gowan is Founder and CEO of Opagio. He spent twenty-five years in fintech, including at IG Group, before building Opagio to help owners see and evidence the intangible value in their businesses. Meet the team.
Buyers price your business through its intangible assets. The owners who defend the multiple build the evidence before going to market.
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