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Basics

What are red flags in financial due diligence?

Also known as: due diligence red flags, M&A warning signs, diligence findings

Short answer

Red flags in financial due diligence are findings that suggest reported results may be unreliable or that the deal carries hidden risk. They often lead to a price reduction, tighter deal terms or a decision not to proceed. Common examples are customer concentration, revenue that does not reconcile to cash, aggressive add-backs, unusual working capital swings, unrecorded liabilities and related-party transactions.

Updated November 2026

Red flags in due diligence, explained simply

Red flags direct where diligence spends its time. Each is resolved by explanation and evidence, by an adjustment to earnings, net debt or working capital, or by a protection in the purchase agreement.

Unresolved red flags usually lead to a lower price, a specific indemnity or escrow, or a decision not to proceed.

Common warning signs by area

Indicative

Revenue timing and working capital trends are among the most frequent areas of challenge.

Worked example

Alder Creek reports 10% revenue growth, but customers now take 62 days to pay compared with 45 days a year earlier. Diligence finds that the sales team extended payment terms to win orders ahead of the sale. Part of the growth was financed by customer credit, and the additional receivables affect the working capital target.

Alder Creek Manufacturing, Inc. is a fictional company. All figures are illustrative.

Why it matters in a deal

How red flags are resolved shapes price, structure and protections. Identifying them early, ideally on the sell side, avoids late renegotiation.

Red flags

  • Sales growth outpacing cash collections
  • Concentration in one customer or supplier
  • Costs reduced sharply before the sale
  • Accounting policies changed between periods

Frequently asked questions

Does a red flag end a transaction?
Rarely by itself. Most are resolved through price or protections.
Can sellers find red flags first?
Yes. That is the main benefit of sell-side diligence.

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