Selling a company in the UK
Roughly half of business sales that reach an agreed price fall apart afterwards, in due diligence. Almost none of them fall apart because the business was bad. They fall apart because the paperwork was not there, or was not consistent, or arrived too slowly. Here is what a UK buyer will ask for, what actually kills deals, and the timeline you should plan against.
The market you are actually selling into
The Department for Business and Trade put the UK private sector business population at 5.7 million at the start of 2025, of which 5.64 million were small, meaning nought to 49 employees. Only 8,335 were large. That is the pool your company sits in, and it is the pool a buyer shops in.
The Office for National Statistics counts a much narrower thing. Its mergers and acquisitions bulletin only records deals worth £1 million or more that change majority control, and in the January to March 2026 quarter it counted 352 of them across the whole country, down from 495 in the final quarter of 2025. Domestic M&A, UK companies buying other UK companies, came to £1.5 billion in that quarter.
Those two numbers together are the useful fact. Almost every UK company sale happens below the line where anybody officially counts it. There is no national statistic covering the sale you are about to run, and no published benchmark you can point a buyer at. Meanwhile BusinessesForSale was listing 14,722 UK businesses for sale on a single day this month. You are one of thousands of listings, and the ones that complete are the ones that answer questions fastest.
The realistic timeline
BTG Eddisons, which sells UK businesses for a living, puts the typical range at six to twelve months from instruction to completion. Fast, simple deals can land in three months. Complex corporate sales run beyond eighteen. It breaks the process into four phases: preparation and valuation at four to six weeks, marketing and finding buyers at two to four months, negotiation and due diligence at two to three months, and legal completion at four to eight weeks.
Morgan and Westfield, working from industry surveys, reports that the average has been quietly getting longer, from about six months in the early 2000s to nearer ten to twelve now. On the online side, where deals are smaller and cleaner, Empire Flippers publishes an average time to sale of 125 days across the 2,664 businesses it has sold. That is roughly four months, with a broker doing the packaging and the vetting for you.
The guide Xero publishes for UK sellers is blunter about the real start date. It tells owners to begin planning twelve to twenty four months before the intended exit, and says that assembling the documents alone typically takes three to six months. The six to twelve month figure is the visible part. The work that makes it possible starts a year or two earlier.
A realistic sale calendar
The two year clock nobody mentions early enough
There is a two year clock running underneath all of this, and it is the reason a sale cannot simply be started when you feel ready. Business Asset Disposal Relief, the relief that used to be called Entrepreneurs Relief, requires the qualifying conditions to be met throughout a period of two years up to the date you sell.
For a share sale, GOV.UK sets out what has to hold for those full two years. You have to be an employee or office holder of the company. The main activities of the company have to be trading rather than investment, or it has to be the holding company of a trading group. You have to hold at least 5 per cent of the ordinary share capital and voting rights, and be entitled to at least 5 per cent of either the distributable profits and assets on winding up, or the disposal proceeds if the company is sold.
The rate has moved twice in two years, and it moved upward both times. GOV.UK gives the current position plainly: 18 per cent on qualifying gains disposed of from 6 April 2026, 14 per cent on disposals between 6 April 2025 and 5 April 2026, and 10 per cent on or before 5 April 2025. A great deal of published UK advice still quotes the old 10 per cent, including guidance written well after the change, so check the rate against GOV.UK rather than against an article.
The practical trap here is the tidy-up. An owner decides to sell, notices the cap table is messy, issues or reshuffles shares to clean it, and resets the two year qualifying period on the shares that matter. Take advice before touching the share register, not after. Separately, the buyer pays Stamp Duty at 0.5 per cent on a share transfer, and only escapes the stamping process where the consideration is £1,000 or less and the transfer is not part of a larger series.
What has to be ready before anyone asks
Every buyer asks for a variant of the same list. LegalVision UK, which advises on UK M&A, describes the standard data room contents as statutory books and constitutional documents, audited financial statements for the past three to five years, key customer and supplier contracts, employment contracts for key personnel, intellectual property registrations and licences, and any regulatory permits needed to operate. Coldstream Capital Partners publishes a near identical preparatory checklist. The overlap is the point. This is a known shape.
Two of those repay attention out of proportion to their size. Change of control clauses are the first: many commercial contracts let the counterparty terminate or renegotiate when the business changes hands, and LegalVision advises finding them before the buyer does, so there is time to seek consent rather than a scramble at the worst moment. The second is the intellectual property schedule, because it is where an owner discovers that a domain, a logo or a piece of code sits in a personal name, or in the name of an agency that stopped answering emails in 2019.
What kills a deal in diligence
Coldstream Capital Partners estimates that roughly half of all business sales fall apart during the due diligence phase. Not before the offer. After it, once the price is agreed and the seller has already spent months and real money getting there. Its list of the five most common causes is worth reading against your own position.
Notice that four of the five are process failures rather than business failures. The company was fine. The sale was not. Only the first is really about trading, and even that one is usually caused by the diligence itself consuming the attention that kept the numbers up.
The reason UK diligence bites this hard is caveat emptor. English law leaves the buyer taking the business as found, with limited recourse if problems emerge after completion outside the terms of the purchase agreement. A buyer who cannot sue you afterwards has every reason to find everything beforehand. That is also why the warranties and indemnities in the agreement get negotiated so hard, and why a surprise found in week nine is far more expensive than the same fact disclosed in week one.
Employees deserve a specific mention. GOV.UK is clear that when a business changes owner, the Transfer of Undertakings regulations usually move employees across with their terms and conditions intact and their continuity of employment maintained, and that the size of the business makes no difference. A buyer prices the workforce it is inheriting. An employee schedule that is incomplete, or a set of contracts that were never signed, is a repricing event waiting to happen.
The public record is already talking to your buyer
Before a buyer meets you, they read the free public record. A private company has to file annual accounts with Companies House within nine months of the financial year end, or within 21 months of incorporation for a first set. Miss it and the penalty is automatic.
Companies House late filing penalties, private company
The money is not the problem. The record is. Companies House guidance, updated in January 2026, also confirms that failing to file accounts or a confirmation statement is a criminal offence, and that directors can be personally fined for it in the criminal courts. A buyer looking at an overdue flag on the public register is not calculating £150. They are forming a view about how the company is run, and pricing it.
There is a newer item on the same record. Since 18 November 2025, identity verification at Companies House has been a legal requirement for directors and people with significant control, verified either directly through GOV.UK One Login or through an Authorised Corporate Service Provider. That date opened a twelve month transition rather than a single deadline, with each person verifying by their own due date. A director who has not verified is a live obstruction, and it will surface at exactly the moment you least want it to.
The one thing that shortens all of it
The single highest leverage act in a sale is having the data room built before heads of terms are signed. LegalVision puts it as reducing delays considerably and signalling to the buyer that the business is well managed. That second half is the part sellers underrate. A buyer cannot audit your management competence directly, so they infer it from how quickly and how completely you answer. A same day answer with a document attached is evidence. A week of silence is also evidence.
None of the list above requires a transaction to be in progress. Statutory books, a reconciled HMRC position, an IP schedule and a signed set of employment contracts are things a well run company holds anyway. The sale simply audits whether you held them. Keeping the pack current is much cheaper than assembling it under a deadline, and it is the difference between a six month process and an eighteen month one.
That is the whole idea behind SnapDue. The pack a buyer will ask for is knowable in advance, most of it can be read straight from the public record, and the rest is a finite list of documents you either have or do not. Keeping it green continuously means the answer to when can you be ready is already.