How Due Diligence Works When You Sell a Business
Once you and a buyer agree on price and terms, the buyer gets a window to check if the business matches what was presented. That means pulling tax returns and bank statements, looking at who the customers are, and reading the leases and contracts that will carry over after closing.
The short version
Diligence starts after you have a signed agreement on price and basic terms. From there the buyer works through the records behind those numbers to make sure the profit and the revenue match what you described during the sale talks.
Think of it as verification, not a chance to renegotiate. If the records line up with what was presented, the price you agreed on holds. If something material turns up that was not disclosed, that is when price and terms get revisited.
Most of the requests will feel ordinary once you see them. Your lender asked for much of the same paperwork when you borrowed, and the buyer's lender will ask the buyer for it again.
What buyers ask for
Buyers send a written request list, usually through their attorney or accountant. It can run to several pages, but for most small businesses the same core documents come up every time and most owners already have them on file.
- Business tax returns. Three most recent years as filed with the IRS.
- Year to date financials. Profit and loss statement for the current year through the most recent month.
- Bank statements. Recent statements for the business accounts, and they need to line up with the books.
- Customer revenue by name. Revenue broken out by customer for the last two years, shared only under the confidentiality agreement.
- Major contracts. Signed agreements with your largest customers and any contracts that run past closing.
- Leases. Your premises lease plus any equipment leases still in effect.
- Licenses and insurance. Copies showing both are current and in your business name.
- Equipment list. What the business owns outright, with the age and condition of the bigger items.
- Business debt. Loan balances and payment terms for anything the business still owes.
Staff interviews are not on that first list, and that is deliberate. A buyer can review paper without putting the sale at risk of getting out inside the shop, so that part comes much later if it comes at all.
The order it happens in
It almost always starts with the financials. The buyer or their accountant reads the tax returns first, then sets them next to your internal books and the bank statements to see if the three tell the same story.
Customer concentration is usually next. The buyer wants to know how much revenue sits with your top few customers and if those relationships are under contract or just longstanding habit.
The legal review runs alongside the rest rather than waiting at the end. Attorneys check the entity filings and ownership records while the numbers are being reviewed, and they confirm early that your licenses and leases can actually transfer to a new owner. The purchase agreement gets drafted during this same window, so the paperwork is ready once the checks come back clean.
How long it takes
For most small business sales, diligence runs 30 to 60 days and that range is typical. Where you land in it depends less on the buyer than on how quickly complete records change hands.
Owners who already have a file ready tend to close on the shorter end. Owners who are pulling statements and hunting for contracts as each request comes in push toward the longer end, and a slow lender can add time on top of either case.
Speed helps, but leaving a question unanswered to hit a date does not. One open item in the final week, usually a missing signature or a license question, is enough to push a closing back.
What actually kills deals in diligence
Small gaps in the paperwork rarely end a deal by themselves. In our experience the closings that fall apart trace back to one of four problems.
Numbers that do not tie
Your tax return shows one profit figure and your books show another, with no clean way to explain the difference. A buyer cannot get comfortable with a price when the underlying numbers do not agree with each other.
A top customer who already left
The customer list you provided includes a large account that stopped ordering months ago. When the buyer finds that in the contract review, they have to assume the revenue they priced is already gone.
Licenses that cannot transfer
Some trades and regulated work require a license that is tied to the owner personally. If that license cannot move to the buyer or be reissued in time, there is no legal way for them to operate the business after closing.
Surprises the seller kept quiet
This is usually an unpaid tax bill or a problem with the lease that the seller knew about and did not raise. The issue itself is often fixable, but finding it late makes a buyer wonder what else has not been mentioned.
That last one matters. Owners who bring a problem forward early, with the paperwork to explain it, usually keep the deal moving. Owners who wait for the buyer to find it tend to lose the buyer, even when the problem itself was minor.
What prepared owners do differently
Put everything from the checklist above into one folder, digital or paper, before you talk to any buyer. Having the returns and statements and contracts in one place means you are sending files the same day a request comes in instead of spending a week looking for them.
If something is missing or messy, say so when you hand the file over and include whatever you have that covers the same ground. A year where the books were kept loosely is easier for a buyer to accept when the bank statements are complete and you have explained the gap up front.
Pick one person on your side to handle all of the requests and keep every answer in one thread. When a buyer gets slightly different numbers from an owner and an accountant in separate emails, they start questioning numbers that were actually fine.
Keep operating the business like you still own it for the next five years, because you do until the closing papers are signed. Buyers watch sales and staffing during diligence, and a bad month that looks like neglect will bring a fresh round of questions.
FAQ
Thinking about selling and want to know what diligence would look like for your business?
Send us a short note about what you run and how long you have owned it. We will walk you through the records a buyer would ask for in your case, so you know where you stand before any price discussion starts.
Start a Conversation