The Business Sale Process, Step by Step

Most owners have never sold a business before, and they will only ever do it once. That inexperience is not a weakness — but it does mean the process itself can feel opaque, and a buyer who has done a dozen deals holds the advantage of knowing exactly what comes next. This guide removes that asymmetry.

The business sale process follows a defined path. Preparation comes first, then a discreet approach to buyers under a teaser and an information memorandum, then heads of terms, then due diligence, then the legal agreement and completion. Each stage has a purpose, a set of documents, and a point at which value is either defended or conceded. Knowing the sequence in advance is what lets you stay in control of it.

This is written for owners of UK businesses turning over roughly £1m to £100m who are preparing to sell, or who have had an approach and want to understand what they are about to walk into.

The shape of a sale, at a glance

A well-run sale is not a single negotiation. It is a sequence of gates, and at each one both sides commit a little more. The teaser costs a buyer nothing; the information memorandum costs them an NDA; heads of terms cost them the effort of a real offer; diligence costs them fees; the sale and purchase agreement costs them the deal. Value leaks at every gate where the seller arrives with assertions instead of evidence.

The timeline above is the process itself, once you go to market. It does not include the preparation that precedes it, which the best-prepared owners begin twelve to twenty-four months out. If you have not started that work, the 24-month exit plan sets out what to do with the runway. The rest of this guide assumes you are ready, or nearly ready, to begin the process itself.

The seven stages, step by step

The process below is the standard shape of a UK private-company sale. Timings vary — a competitive process with several bidders runs differently from a bilateral deal with a single trade buyer — but the sequence is remarkably consistent.

Each of these stages is examined in turn below. The through-line to hold onto is that almost everything that determines your outcome happens in stage one — and that the buyer's job in stages five and six is to test whether stage one was done properly.

Stage 1: Preparation and vendor diligence

Preparation is the stage owners most often shorten, and the one that matters most. A buyer does not pay for last year's profit; they pay a multiple of normalised earnings, and they set that multiple based on how much of the business will survive without you. Everything a buyer will test in diligence, you can pre-empt here.

Three documents do most of the work. The first is a normalised EBITDA — a profit and loss stripped of owner-specific costs and one-offs so a buyer can see the real earnings power the multiple is applied to. The second is a register of the intangible assets you actually own — brand, customer relationships, technology, data, processes — with clear title and, where possible, a valuation. The third is a data room: the documents diligence will demand, organised so the process runs quickly and cleanly rather than defensively.

Increasingly, sellers also commission their own vendor due diligence report before going to market. Paying for your own diligence sounds counter-intuitive, but it controls the narrative: you find the issues first, present them on your own terms, and remove the buyer's advisers' ability to frame every gap as a reason to pay less.

Stage 2: The teaser

With preparation done, the process begins quietly. Your adviser produces a teaser — a short, anonymised summary of the opportunity — and approaches a shortlist of buyers who might logically want the business.

The teaser is deliberately thin. It names the sector, the rough size, the reason for sale, and the headline attraction, but not the company. Its only job is to generate a first flicker of interest without exposing the business or alerting staff, customers, or competitors that a sale is under way. Confidentiality at this stage is a commercial asset in its own right: a leak can unsettle customers and give a buyer leverage.

Who receives the teaser matters more than how many do. A curated list of genuine strategic and financial buyers produces better outcomes than a broadcast to hundreds, because the aim is to find the buyer for whom your business is worth more than its standalone numbers — often because your intangible assets fill a specific gap in theirs. For more on building that list, see how to find a buyer for your business.

Stage 3: NDA and the information memorandum

A buyer who bites on the teaser signs a non-disclosure agreement. Only then do they receive the information memorandum — the anchor document of the whole process.

The information memorandum, or IM, is the business's case for its value, told in full. It sets out the history, the market, the customers, the financials, the growth story, and — critically — the intangible assets that a buyer is really acquiring. A weak IM presents a set of accounts and hopes the buyer sees the value; a strong one makes the value explicit, showing why the earnings are durable, why the customers stay, and why the business runs without the owner.

What the information memorandum should evidence

The IM is where preparation pays off visibly. The register and normalised P&L you built in stage one become the spine of the document, and the story you can tell is only as strong as the evidence behind it. This is also why the same stage-one work that defends your price also compresses your timeline: a buyer reading a well-evidenced IM asks fewer questions in diligence.

Stage 4: Offers and heads of terms

Buyers who have read the IM submit indicative offers. In a competitive process, you and your adviser weigh them — not only on headline price, but on structure, deliverability, and the buyer's likely behaviour through diligence. A slightly lower offer from a credible buyer who will actually complete is worth more than a high number that unravels.

You then select one buyer to proceed with, and the outline of the deal is set down in heads of terms — sometimes called a letter of intent or term sheet. Heads of terms are mostly non-binding, but they are far from trivial: they fix the headline price, the structure, the treatment of any earn-out, and usually a period of exclusivity during which you agree not to talk to other buyers.

That exclusivity is why heads of terms matter more than their non-binding status suggests. Once you sign, your negotiating leverage falls, because the buyer knows you have stopped talking to anyone else. Everything you want to establish about price and structure is easier to hold before this point than after it.

Stage 5: Due diligence

With heads of terms signed, the buyer commits real money to fees and begins due diligence. Their advisers examine the business across four fronts — financial, legal, commercial, and tax — and their brief is to find every reason the business is worth less than the offer, or every risk that should be covered by a warranty.

Diligence is where the two kinds of seller diverge most sharply. The prepared seller has a data room ready, has done their own vendor diligence, and has evidenced the claims in the IM; findings are pre-empted, and the process is a confirmation. The unprepared seller assembles documents reactively, under time pressure, and every gap the buyer's advisers find becomes a price chip or a demand for a broader set of warranties and indemnities.

What diligence tests, and what protects your price

The intangible line in that table is the one owners most often underprepare, and it is where most of the value sits. A buyer who cannot confirm that you own your technology, that your trademarks are registered, or that key customer relationships transfer will price that uncertainty conservatively. The register you built in stage one is what turns each of those questions into a documented answer.

Stage 6: The sale and purchase agreement

As diligence concludes, the lawyers move to the sale and purchase agreement — the SPA, the binding contract that transfers the business. This is the most heavily negotiated document of the process, and its centre of gravity is risk allocation.

Three elements do most of the work. The warranties are the seller's contractual statements about the business — that the accounts are accurate, that there are no undisclosed liabilities, that you own what you say you own. The indemnities are specific promises to cover identified risks pound for pound. And the disclosure letter is the seller's shield: by disclosing a known issue against a warranty, you qualify that warranty and protect yourself from a later claim. What you disclose, you cannot be sued over; what you conceal, you can.

The SPA also settles how the final price is fixed. Two mechanisms dominate in the UK.

Completion accounts versus locked box

Part of the SPA also depends on a choice made earlier: whether the deal is a share sale or an asset sale. In the UK, that choice has material consequences for tax — including for Business Asset Disposal Relief — and for what actually transfers. We cover it in share sale vs asset sale; confirm the structure well before the SPA is drafted, because it shapes the entire document.

Stage 7: Completion and beyond

Completion is the day the SPA is signed, funds transfer, and ownership changes hands. It feels like the finish line, and in the sense that the business is now sold, it is. But two things usually continue past it.

The first is the price mechanism. If the deal used completion accounts, the accounts are drawn up and the price is trued to actuals, which can take weeks and occasionally leads to a dispute over working capital or net debt. If it used a locked box, the price is already fixed and completion is cleaner. Part of the consideration may also sit in an escrow account for a period, released once any warranty risks have passed.

The second is your continued involvement. Many deals include an earn-out, where part of the price depends on the business hitting agreed targets after the sale — and often a transition period during which the buyer expects you to hand over relationships and knowledge. If your business was heavily dependent on you, expect a longer and more onerous handover, which is one more reason reducing owner dependency before the process pays twice: a higher multiple, and a cleaner exit.

Where the price is actually won

Reading the process end to end, one pattern stands out: the stages that feel most like the deal — the offers, the negotiation, the SPA — are largely where a fixed outcome is confirmed. The stage that actually sets the outcome is the one that happens before any buyer is looking. Preparation is not the run-up to the sale; it is the part of the sale that determines the price.

This matters because most of what a buyer pays for is intangible — the brand, the customers, the technology, the processes, the people — and almost none of it appears on the balance sheet a buyer is handed. The purpose of preparation is to make that hidden value visible and defensible before it is ever negotiated over. A buyer prices what they can verify; the seller's job, done early, is to make the intangible value verifiable.

None of this requires you to become a corporate finance expert. It requires you to understand the sequence, to prepare the evidence the sequence will test, and to arrive at each gate with documentation rather than assertion. That is the difference between accepting the number you are offered and defending the number the evidence supports.

If you are earlier in the journey, start with the sell-side hub and work through the 24-month exit plan. When you are ready to build the evidence a buyer's diligence will demand, see what Opagio Intangibles produces — the Value Drivers Register and Normalised P&L your adviser can put in front of buyers.

For a plain-language overview of the whole journey, see how do I sell my business.

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.