Every year, tens of thousands of business owners decide to sell. They appoint a broker, produce a teaser document, and go to market. The majority of them will still own the same business twelve months later.
The failure rate is not a secret. Most M&A advisors will tell you privately that 70 to 80 percent of businesses listed for sale fail to complete a transaction. What is less discussed is why — and what can actually be done about it.
The broker’s diagnosis versus the real problem
When a deal falls through, the explanation is usually price. The owner wanted too much; the buyer wouldn’t stretch. This is the comfortable story — it suggests a simple gap between two rational parties that couldn’t find common ground.
It is rarely the real explanation.
In the majority of failed transactions, the issue is not price. It is due diligence. A buyer agrees heads of terms, engages advisors, and starts looking under the bonnet — and what they find causes them to walk away, or to come back with a revised offer that is so far from the original that the owner refuses.
The problems they find are almost always the same:
- Owner dependency — key relationships, tacit knowledge, or operational functions that exist only in the owner’s head
- Revenue concentration — one or two clients representing a disproportionate share of income, creating unacceptable exit risk
- Undocumented processes — systems that work because the same people have done them for years, not because they are written down and transferable
- Financial opacity — personal expenses run through the business, informal arrangements, or accounts that don’t tell a clean story
- Weak management depth — a senior team that is competent but entirely dependent on the owner to set direction
None of these problems are discovered for the first time in due diligence. They exist in the business before the process starts. The failure is that most owners never receive an honest assessment of them until a buyer has paid for one.
The preparation window is longer than you think
The instinct is to treat exit preparation as something you do close to the date. Most owners begin thinking seriously about it twelve to eighteen months before they want to sell. Some start even later — after they’ve had an approach and suddenly realise they aren’t ready.
That window is not enough time to fix the things that matter.
Reducing owner dependency takes time. It requires hiring the right people, documenting what you know, transferring relationships, and then proving — over a period of observable business history — that the machine runs without you. Buyers don’t take your word for it. They look at the last three years of accounts and the track record of the management team.
Cleaning up a financial story takes similar time. If you want your accounts to tell a clear, consistent EBITDA narrative, you need multiple years of clean trading history. A single good year after three years of mixed figures is unconvincing.
The preparation window is 3 to 5 years. That is not a conservative estimate — it is what is required to genuinely shift the things that buyers actually care about.
What the businesses that do sell have in common
The deals that complete — and complete at a price the owner is satisfied with — share a consistent set of characteristics.
The business runs without the owner at its centre. There is a management team that buyers feel comfortable inheriting. Revenue is spread across a diversified client base, with a meaningful proportion under contract. Processes are documented. Accounts are clean, consistent, and easy to audit. Contracts survive a change of control.
These are not complicated things. They are predictable things — and they can be built, with enough lead time and the right focus.
The businesses that never sell are not usually bad businesses. They are often highly profitable and genuinely valuable. What they lack is readiness — the structural condition that allows a buyer to see the value clearly and trust that it will survive the transaction.
Why owners start too late
There are a few common reasons why owners delay preparation.
The most frequent is that they don’t have a clear exit horizon. The business is doing well, there is no pressing reason to sell, and the idea of preparing for something that might be five years away feels abstract. This is precisely the wrong framing.
The second reason is that owners receive no honest feedback about where their business actually stands. Their accountant produces annual accounts. Their broker, when they eventually engage one, is focused on positioning the business for market — not on telling them that it isn’t ready.
The third reason is that the problems are invisible from the inside. If the business runs because of you, you don’t notice that it runs because of you. It just runs. It takes an external diagnostic — something like the 7 Mills Score — to make visible what buyers will see.
The cost of getting this wrong
The financial cost of under-preparation is significant.
Businesses that go to market without adequate preparation either fail to sell, or sell at a meaningful discount to their potential value. The discount compounds: a multiple compression of 1× EBITDA on a £500k EBITDA business costs £500,000. On a £2m EBITDA business, the same compression costs £2 million.
These are not hypothetical numbers. They represent the gap between what a well-prepared business commands and what an unprepared one accepts — if it sells at all.
The investment required to close that gap is a fraction of the value at stake. For most business owners, exit preparation is the highest-return investment they will ever make.
The question is not whether preparation matters. It demonstrably does. The question is whether you have started — and whether you have enough time left to do it properly.
If you’re not sure where your business stands, the 7 Mills Score gives you a scored assessment across all seven dimensions of exit readiness. It takes 8 minutes and is free.