What buyers actually check in diligence
The Crowfly TeamSeptember 4, 2026~4 min readAsk people who have actually bought small service businesses what due diligence looked like, and they describe the same short list of checks: bank statements compared against the books, the top customers' share of revenue, a flat question about why three months are missing from the file. Diligence is where the story you tell about your business gets tested against the paper trail, and what the buyer finds there sets the price. Here is what they check, in roughly the order they check it.
The check that sets the price
Two janitorial businesses, sold through the same broker around the same time, tell the whole story in two numbers. One sold for close to 1x seller's discretionary earnings, because the books were a mess. The broker's own guess was that the real earnings ran higher, but nobody could prove it, so the buyer priced in the risk. The other sold for just over 3x SDE. Same trade, same broker. The only difference the broker pointed to: clean, organized books and documented operations. Nothing else.
That's diligence in one before-and-after. Buyers price what they can prove, and messy records get treated like a hidden liability even when the business itself is fine. One honest caveat: this comparison comes from a broker's own post, so hold the exact dollar figures loosely. The direction, clean books earn a real multiple, holds up everywhere else in the same conversations.
The bank tells the real story
The first thing a serious buyer does with your books is stop trusting them. They ask for bank statements and check whether the two stories match. One buyer, recounting a deal that fell apart, put it plainly:
"The books looked clean until I asked for bank statements. QuickBooks showed one story, the bank showed another."
The same conversation turned up a second version of the problem: a seller who produced financials for every month except three, with a different excuse each time. Guess which months were the bad ones. A buyer treats missing records as a place to dig, and the digging is the whole job.
"Diverse client base" is code for something
Concentration is the euphemism buyers have learned to distrust on sight. A listing that promises a "diverse client base" gets tested by adding up what the top few customers actually represent. In that same conversation, one buyer found three customers were 60% of revenue, one of them the seller's brother-in-law. That relationship did not survive the sale.
It's why "my customers love me" and "my customers are contractually mine" get treated as two completely different facts once a buyer starts checking (we've written about that gap in more depth). Loyalty to a person doesn't transfer. A number a buyer can verify does.
The red flags that don't need an accountant
Some findings don't need anyone to open a spreadsheet:
- Two sets of books, one for the seller and one for everyone else
- The owner is the business. Pull them out and see what's left
- Unpaid family labor propping up the margin. Price it at market rate and the "profitable" business runs a loss
Buyers who skipped these checks tell the same story afterward. One, describing a deal closed too fast, watched the leads that had come through the previous owner's personal relationships dry up almost overnight, leaving a pipeline to rebuild from nothing.
What clean records actually buy you
The flip side rarely gets told, because sellers who breeze through diligence don't usually post about it. One did: financials, tax filings, and point-of-sale records that all matched. Diligence moved fast, the deal closed with a 10% holdback instead of a bigger one, and every dollar of that holdback came back at the end of escrow. Nothing dramatic happened. There was nothing to find.
The part sellers don't talk about
Diligence also costs you something the checklists never mention: it's a second job, running at the same time as the one you already have. A buyer with private-equity experience described the pattern from the other side of the table:
"Time kills deals. When you devote your time to diligence requests, and there will be tons of them, tax, accounting, legal, general business questions, and not answering customers or running your business, your performance drops."
Diligence can shrink the very numbers it's checking, if it eats enough of your attention. Confidentiality carries its own risk too: one seller in the same conversation had to fire an employee who'd caught wind of the deal before it closed.
What all of it comes down to is whether the records that answer these questions already exist, or whether you'd be building them from memory the week a buyer asks. A booking system that keeps a real history (per-customer revenue, how often people actually rebook, what's contracted versus one-off) turns that chunk of diligence into an export. If selling is anywhere on your horizon, the records are the part you can start on today.