Red flags when buying a business, and what to do about each
Short answer
The most serious red flags when buying a business are refusals and mismatches: a seller who won't share bank statements or tax returns, bank deposits that don't support reported revenue, and add-backs with no evidence. Next come structural risks you can sometimes manage with price or terms: heavy customer concentration, a lease that can't be assigned, key staff who may leave, falling revenue, and deferred maintenance. Treat each by asking for evidence, renegotiating, restructuring, or walking away.
Every business has problems. Red flags are the ones that change what the business is worth, whether you can finance it, or whether you can trust what you've been told.
Financial red flags
| Red flag | What to do |
|---|---|
| Won't share bank statements or tax returns | Explain the lender requires them; if still refused, walk. See seller won't show returns. |
| Deposits below reported revenue | Get the full account list; reconcile; price on what's provable. See proof of cash. |
| Tax returns far below the P&L | Lenders usually rely on returns. See returns vs P&L. |
| Add-backs without evidence | Exclude them until supported. See add-backs. |
| Recent revenue drop or one unusual year | Use a trailing twelve months and ask why. |
| Numbers change between versions | Ask for a reconciliation; treat with caution. |
How to rate a red flag
Not every red flag is a reason to walk. Ask three questions of each: how big is it (what share of earnings or price does it affect), can it be verified or fixed before closing, and can the deal terms protect you (a lower price, a holdback, a specific indemnity, a closing condition)? A $5,000 undocumented add-back on a $300,000 SDE business is a price conversation. Bank deposits $150,000 short of reported revenue with no explanation is a trust problem that no clause fixes. Rate each finding small, medium or deal-changing, and keep the list in writing so you can see when small ones add up.
Operational and legal red flags
| Red flag | What to do |
|---|---|
| One customer is a large share of revenue | Read the contract; use price, a seller note or a holdback. See concentration. |
| Lease short or not assignable | Make landlord consent a closing condition. |
| Licences can't transfer | Confirm the path and timing first. |
| Owner does everything | Longer transition, key staff retention. |
| Worn equipment, deferred repairs | Inspect; price in a capex reserve. See deferred maintenance. |
| Pending litigation or regulator issues | Legal review; indemnities; escrow. |
| Seller rushing you | Hold to your process. |
Note that earnouts are not allowed in SBA-financed acquisitions under SOP 50 10 8.1, so concentration is usually handled with price, a seller note or a holdback instead.
Mistakes when buying a business, and how to avoid each one
The most expensive mistakes when buying a business are: trusting the seller's add-backs, skipping the bank-deposit check, ignoring working capital, discovering lease problems late, paying today for growth that hasn't happened, underestimating owner dependence, stretching to the maximum loan, and closing without a written transition plan. Most are avoided by doing the cheap checks before the expensive ones.
Every one of these shows up repeatedly in small business deals. None requires bad luck; each is a skipped check.
| Mistake | What it costs | The fix |
|---|---|---|
| Trusting the add-backs | Overpaying by the multiple times every false add-back | Rate each one; price on solid only. Add-backs |
| Skipping the bank check | Paying for revenue that never existed | Proof of cash |
| Ignoring working capital | Cash crunch in month one | Working capital in the LOI |
| Lease surprise | Rent jump or no location | Read the lease before the LOI |
| Paying for future growth | Paying the seller for your work | Price on historical, verified earnings |
| Underestimating owner dependence | Revenue drop after handover | The week test; transition plan |
| Borrowing the maximum | No room for a bad quarter | Keep coverage and reserves |
| No transition plan | Lost relationships and know-how | Written transition |
| Using the seller's advisers | Conflicted advice | Your own attorney and CPA |
| Falling in love | Rationalizing red flags | Written walk-away rules |
Worked example: one mismatch, followed through
Illustrative example, not a real business
The P&L shows $1,450,000 of revenue. Bank deposits across the account the seller provided total $1,310,000. The gap is $140,000, or about 10%. Asked about it, the seller says some customers pay into a second account. You ask for that account's statements: it shows $95,000 of deposits from customers, and $40,000 of transfers in from the owner's personal account. Customer deposits now total $1,405,000, still $45,000 short of the P&L, and the transfers aren't revenue at all. The seller then says the $45,000 is "receivables not yet collected", but the balance sheet shows receivables barely changed during the year. You now have a specific, documented question for the seller and a number to price on. Most red flags resolve this way: one document leads to the next, and the answer is either an explanation with evidence or a lower number.
Red flags in the seller's behavior
- Documents arrive late, in pieces, or reformatted instead of as originals.
- Answers change between the CIM, the first call and diligence.
- The seller discourages you from talking to the landlord, key staff or the accountant.
- Urgency without a reason: "other buyers are lining up" while documents stall.
- Requests to keep things off paper: side payments, cash, unwritten promises.
- Emotional resistance to any number below the asking price, even with evidence.
Behavior isn't proof of anything, and many honest sellers are disorganized. But a pattern of these is a reason to slow down, ask for originals and rely only on what's documented.
Walk-away rules to write down before you start
- No tax returns or no bank statements: walk.
- Revenue gap over a set percentage that the seller can't document: reprice or walk.
- Top customer above a set share with no contract: reprice, restructure or walk.
- Coverage under 1.25 on verified earnings at the agreed price: reprice or walk.
- Landlord won't assign or extend the lease: walk.
- Seller asks you to skip your attorney or your lender's process: walk.
Set your own thresholds; the point is to decide them before you're attached to a deal.
Red flags in the documents themselves
- Tax returns that are unsigned, or show a preparer the seller can't name.
- P&Ls with round numbers month after month.
- Bank statements provided as spreadsheets instead of bank PDFs.
- Different revenue figures in the listing, the CIM and the tax return, without a reconciliation.
- Financial statements for the current year but tax returns only for older years.
- Large "other" or "miscellaneous" expense lines nobody can break down.
- A seller who offers to "walk you through" the numbers but won't send them.
Any one of these may have an innocent explanation. Ask for the explanation in writing, and for the document that supports it.
Red flags in the timeline
Pressure on time is a red flag of its own. Be careful when a seller or intermediary insists on a very short exclusivity period, refuses to extend diligence when documents arrive late, pushes you to remove financing or diligence contingencies early, or says another buyer is ready to close next week. Good deals can be urgent for honest reasons, such as a health problem or a lease deadline. Ask what drives the timeline, and keep the contingencies that protect you until the documents have arrived and been checked.
Write down every red flag you find, and what explained it, as you go. When it's time to decide, a list showing several unexplained items is easier to act on than a vague sense of unease.
Frequently asked questions
What's the biggest red flag?
A seller who won't let you verify the earnings: no bank statements, no tax returns, or numbers that keep changing.
Is a cash business a red flag?
Not by itself, but unreported cash can't be counted toward what you'll pay or borrow. Value the business on what's provable.
Can red flags be fixed with deal terms?
Some can: a lower price, seller financing, an escrow holdback or longer transition can manage risks like concentration or key-person dependence. Unverifiable earnings usually can't be fixed by terms.
When should I walk away?
When you can't verify the earnings, when the seller misleads you, or when a risk is large and the seller won't share it through price or terms.
What is the biggest mistake when buying a business?
Paying for earnings that aren't real, usually because the price was based on the seller's SDE including undocumented add-backs.
How do I avoid overpaying?
Rebuild SDE from tax returns, rate each add-back by evidence, check revenue against bank deposits, and price on the supported figure.
Sources
- SBA SOP 50 10 8.1, Appendix 15 (Cash Proof and QoE requirements)
- SBA: Buy an existing business or franchise
- IRS: Get transcript
- IRS IRM 4.10.4 (examination of income, including bank deposit analysis)
- Cornell LII: UCC Article 9 (liens)
Related guides
General information, not legal, tax, financial or investment advice. Rules and lender practices change; check the linked sources and talk to your attorney, CPA and lender about your deal. Examples with named numbers are illustrations, not real businesses. OKtoBuy's Deal Check does not value businesses or give price opinions.