What is due diligence when you sell a business?
Due diligence is the buyer's check of the business after the letter of intent is signed: its accountants test the earnings in a Quality of Earnings review, its lawyers read the contracts, and its operating team asks how the work actually gets done. Every answer is checked against what the buyer was told before it agreed the price, in the CIM, the data room, and the management meetings.
It comes in the last of the sale's four phases, diligence and close, once one buyer has signed the letter of intent and has the business to itself. That is the point in a sale when the founder has the least leverage, which is why the preparation comes before it.
Signing to the wire: seven to twelve months. Every time given here is an estimate drawn from past engagements, not a commitment. Each sale runs on its own calendar, set by how ready and how complex the company is, by the buyers and their lenders, and by the lawyers on both sides. We set a calendar with you at kickoff and revisit it as the process moves. The sale, phase by phase
This guide is written from the seller's side, for founders of businesses typically $1 million to $25 million of adjusted EBITDA, the companies the deal team works with. The request list itself is in the checklist, and the flags buyers find most often, each with its fix, are in the list of ten.
How do you diligence your own business before a buyer does?
Write the buyer's list yourself, before launch: list what a buyer will find, mark each flag yellow or red, and decide what to do about each one. That is what the Diligence Flags section of every deal workbook does, with each flag recorded the same way: the finding, the observation, and the read-through to price or structure.
Then work through the information requests a buyer would make. It shows which documents exist, which need to be found, and which need to be created, and it is the fastest way to build a data room that answers questions before they are asked.
It works best when someone who thinks like the buyer's team does it, at arm's length from the business, because a founder knows the business too well to see it the way a stranger will. The Go-To-Market Analysis is that read: a discovery meeting asked from a buyer's side of the table, your financials, the deal workbook, and a line-by-line session with your CPA to find every add-back that can be defended.
of the founder-led companies whose written assessments list their constraints had processes that were not documented: the gap a buyer finds when it asks how the work gets done.
68 of 108 companies with written constraint lists, scalability assessments completed with FNDRS, October 2024 to October 2026
Fix or frame: the triage
Sort every flag on two questions: how much it would affect price or deal certainty, and how easily it can be fixed before going to market. The answers put each one in a quadrant of the playbook's diligence flag triage, and the quadrant says what to do.
| Impact on price or certainty | Easy to fix before market | Hard to fix before market |
|---|---|---|
| High | Fix it now: cash-basis books, a license in the owner's name, undocumented add-backs, missing contracts | Frame it: customer concentration, a down year, a pending claim |
| Low | Tidy: small housekeeping items, fixed as a batch, early | Note and move on: minor legacy issues, listed in the data room |
From The FNDRS Playbook's diligence flag triage. In the workbook each flag is also marked yellow or red.
Fix first, because each fix removes a flag entirely. Frame what cannot be fixed in time: explain the issue, its cause, what has been done about it, and why it matters less than it first appears. Framing is not spin. The facts are the same; what changes is who presents them, when, and with what evidence.
Yellow and red is how a flag is marked, never a ranking: what a flag costs depends on the business it is found in.
Disclose before offers arrive
Disclose what you framed before offers arrive, not after exclusivity: each issue goes into the CIM and the data room with the context you wrote for it in the triage. Why the timing decides what an issue costs is in the list of ten.
Disclosure goes on after the letter of intent. Once the definitive agreement is drafted, every exception to its statements about the business is written into the disclosure schedules: a disclosed issue is a priced issue, and a surprise is a retrade.
Build the data room from your own list
Build the data room from the list you wrote, once each flag is fixed or framed: the financial statements and tax returns, the contracts, leases and licenses, the employee records, the corporate documents and insurance, and each known issue with its context, indexed so a request is answered from the file.
In the sale itself, the data room is assembled in the first phase, alongside the CIM, and once diligence begins the buyer's requests are answered from it, with the questions kept in one place.
Why do deals get re-priced in due diligence?
Most often because the business misses its numbers while the buyer is checking: a missed quarter during diligence is the most common reason deals get re-priced. A finding the buyer was not told about does the same, as a reason to lower the price, defer part of it, or ask for more protection.
Both are answered before diligence begins. A business that has diligenced itself leaves a buyer little to find, and a founder who is not fixing problems in the middle of the sale can keep running the company to plan.
What can stretch the calendar is known in advance too: financials that need restating, several legal entities, something the quality of earnings review turns up, the consents a sale needs, licenses that have to move to the new owner, and the buyer's own financing.
Who answers the buyer's questions during due diligence?
The deal team does: it manages the request list, answers from the file built before launch, and coordinates your attorney and CPA, so your own job is to run the business to plan. Scott Stepanik, the Director of M&A, leads every sale, and the deal team carries diligence with him.
You are asked for documents and decisions, and the aim is to keep that to a steady, bounded share of your week. Keep the cost base where it was, record revenue and expenses the way you always have, and keep the customers and the team steady: a weak month during diligence gives a buyer a reason to revisit the price.
The goal is simple: the deal you signed is the deal that closes.