Due diligence does not kill deals. It reveals whether a deal deserved to survive… and that verdict is written months before the buyer’s team arrives.

Approximately 70% of lower middle market transactions fail to close. The majority of those failures happen during due diligence. Not because the businesses were bad… because they were never prepared to be examined.

I manage due diligence on the seller’s side of active transactions. I have prepared the records a buyer’s team will examine and sat with owners through the weeks when the questions do not stop coming. The pattern across those engagements is consistent: diligence does not kill deals. It reveals whether a deal deserved to survive.

A sale I worked on fell apart more than four months into a particularly difficult diligence process. The company was strong… high margins, excellent earnings… and the financial records were messy because the owner had never run the business to sell it. The buyer’s team kept pulling threads, each pull opened more questions, and eventually the buyer moved to renegotiate the price. The seller, exhausted, took the company off the market. No one was happy with the result.

Sellers, understand this: the buyer’s diligence team is not your friend. They are not your enemy either. They are doing exactly what you would do before wiring eight figures for a business you did not build. Diligence is not a conversation. It is an interrogation… and the outcome of an interrogation depends on what the record shows. That part is still in your hands.

What the Buyer’s Team Actually Examines

Once the Letter of Intent is signed, the buyer earns the right to verify. Verification is the whole game. The buyer believes the business in the offering materials is real. Diligence exists to confirm it.

The scope surprises nearly every owner. The request list arrives with hundreds of items, organized into workstreams, each managed by a specialist on the buyer’s side. A quality of earnings team tests whether your reported profits are real and sustainable. They rebuild your financials from the trial balance and the account-level detail beneath it, then verify the results against bank activity and tax returns. Transaction attorneys read every contract for change-of-control provisions (clauses that let a customer, landlord, or lender walk away when ownership changes). Other specialists examine employment agreements, benefit plans, insurance coverage, intellectual property, and, in some industries, environmental exposure. (The first time an owner sees a full request list, the reaction is nearly always the same: “They cannot be serious.” They are.)

Then there is the part nobody warns you about. Every answer generates new questions. You produce the customer contracts; they ask why your top three customers represent 40% of revenue. You produce the financials; they ask why margins moved in year three. Diligence is not a checklist that gets shorter. It is an interrogation that gets deeper, and it goes wherever your records lead it.

The Five Reasons Deals Die Here

Across the transactions I have managed and the ones I have watched from close range, deal failure in diligence traces to five causes.

Every one of them is preventable.

Undisclosed liabilities. These take familiar forms: a pending dispute, a tax exposure, a handshake side agreement with a key employee. Buyers can absorb bad news that is disclosed early and framed honestly. What they cannot absorb is surprise. Surprise tells the buyer there may be more they have not found, and once that thought takes hold, the price drops or the buyer walks.

Numbers that do not tie. The financials in your offering materials say one thing; the bank statements and tax returns say another. Sometimes the gap is innocent… cash accounting in one place, accrual in another, personal expenses run through the business. Innocent does not matter. Every discrepancy the quality of earnings team finds costs you credibility, and credibility is the currency the entire transaction runs on.

Unaddressed key person risk. The buyer asks who owns the customer relationships, who sets pricing, and who the employees call when something breaks. If every answer is you, the buyer is not purchasing a business. They are purchasing you, and you are the one asset that is leaving.

Undocumented systems. The business runs, and nobody can show how. Processes live in memory and habit rather than on paper. To the owner, that feels like efficiency. To the buyer, it reads as risk they cannot price.

Owner fatigue. The least discussed cause and, in my experience, one of the most common. Diligence runs 60 to 120 days. Somewhere in the middle, an unprepared owner… exhausted and buried in requests… simply stops fighting for the deal. Deals do not always die from a finding. Some die because the seller runs out of will.

The Toll Nobody Prepares You For

The operational burden of diligence is heavy. The psychological burden is heavier.

For those 60 to 120 days you are working two full-time jobs. The first is answering the buyer’s team, which treats your life’s work as a set of claims to be tested. The second is running the business at full performance, because the buyer is watching your current results too, and a slump during diligence hands them grounds to reprice the deal at the worst possible moment.

Confidentiality makes it lonelier. In most deals you cannot tell your management team. You cannot vent to industry peers. The one person you can talk to, often a spouse, absorbs months of secondhand stress on top of their own. What I actually say to owners in week nine, when the requests have not slowed: “Keep your eye on the ball here. This is a marathon, not a sprint.” Neither sentence would survive an editor. Both survive week nine.

None of this means you are doing it wrong. It means you are doing it. The owners who come through intact built a support structure before they needed it: a transaction CPA and an M&A attorney who have carried this weight before, and an integrative advisor whose job includes managing the seller’s stamina, not just the seller’s documents.

Preparation Is Insurance

Every cause of death in the previous section has the same antidote: work done before the buyer arrives.

This is where the Disciplines connect. The Honest Assessment work (Discipline 2) shows you what a diligence team would find while there is still time to fix it quietly. The Building Value work (Discipline 3) closes those gaps in the 12 to 24 months before market… cleaning the financials and building the leadership bench that answers the key person question. By the time a buyer’s team shows up, diligence should feel less like an ambush and more like a tour you have already rehearsed.

Every documented process is a question answered before it is asked. Every financial statement that ties to the bank records is a deposit of credibility. Every succession plan is proof the business survives your exit. None of that is overhead on the way to a sale. It is the work that determines whether there is a sale.

Owners sometimes ask whether a cleanup sprint in the 90 days before market can substitute. It can improve things at the margins. It cannot manufacture two years of clean records in a quarter, and buyers know the difference between a business that is genuinely ready and one that has been staged for the showing.

The sale in my opening did not really die in diligence. It died years earlier, when an owner built a strong company that was never run to be sold. Diligence only delivered the news.

Key Takeaways

Approximately 70% of lower middle market deals fail to close, and most of those failures happen during due diligence. The causes are consistent and preventable.

Diligence is verification, not accusation. Disclosed bad news is survivable; surprise is what collapses trust, and trust is the currency the transaction runs on.

Five failure modes account for most diligence deaths: undisclosed liabilities, financials that do not tie to source records, unaddressed key person risk, undocumented systems, and owner fatigue.

The psychological weight is real. Owners work two full-time jobs for 60 to 120 days under confidentiality that isolates them. Build the support structure before you need it.

Preparation is insurance. The assessment and value-building work done 12 to 24 months before market turns diligence from an ambush into a tour you have already rehearsed.

Where to Start

Surviving diligence starts with knowing what a buyer’s team would find if they arrived today. The CEOIQ® Renaissance Executive Briefing walks through the readiness framework that helps you see your business the way a diligence team will. You can register at ceoiq.us.

If you are already in a deal… an LOI signed, a request list already on your desk… the time for a briefing has passed. Reach out to me directly at [email protected] with the subject line “Already in It.” No pitch. Just a conversation between two people who take this seriously.

Diligence does not have to be the stage where your deal dies. It is the stage where your preparation either pays off or gets priced. Which one is still your choice.

… Ben

Author: Ben Griffin

Facilitator - CEO Peer Advisory Group; Executive Coach; Photographer