financial due diligence

You’ve found the perfect business: steady revenue, clean-looking financials, and a seller eager to close. Six months after the wire clears, you realize the profit you paid for never existed.

It happens more often than buyers think. The ACFE’s 2026 Report to the Nations found that financial statement fraud appears in only 6% of occupational fraud cases, but it carries a median loss of $1 million per case, the highest of any scheme type. And in Marsh’s 2026 transactional risk claims report, breaches of financial statement representations made up 26% of M&A insurance claims, with most paid losses coming from claims reported more than a year after closing.

Translation: cooked books often surface after you own the problem. Strong financial due diligence is how you find them before you sign.

Why Sellers Cook the Books

When a business is valued on a multiple of earnings, every extra dollar of profit can be worth several at closing. That’s a powerful incentive to dress up the numbers.

Common motives include:

  • Inflating the sale price by overstating revenue or hiding expenses
  • Hitting earn-out targets after the sale to unlock extra payments
  • Masking a declining business before the trend becomes obvious
  • Hiding debt, such as merchant cash advances or unpaid taxes

The ACFE’s 2026 data also shows that owners and executives made up 16% of fraudsters, and their schemes cause losses about nine times larger than those of regular employees. In a small business sale, the person who controls the books is usually the person selling it.

Real Cases: What Cooked Books Look Like

Hidden expenses to inflate an earn-out. In a DOJ case, the founder of a Kentucky data processing company sold it in a deal that included an earn-out tied to earnings. He admitted to keeping about $971,000 in operating expenses off the books by paying them from outside accounts and signing false certifications about the financial statements. He pleaded guilty to conspiracy to commit wire fraud after collecting about $1.9 million in inflated incentive payments.

Fabricated reports and a fake CPA. In another DOJ matter, the owner of a Tennessee logistics brokerage was indicted for allegedly inflating revenue and giving a public company buyer fabricated financial reports during a roughly $9 million sale. Prosecutors alleged she falsely claimed a CPA prepared the numbers and fabricated emails from that accountant. An indictment is an accusation, not a conviction, but the alleged playbook is a warning.

Both cases share one lesson: documents the seller controls can be manufactured. Financial due diligence has to test them against sources the seller doesn’t control.

Red Flags That Should Stop the Deal Clock

Watch for these warning signs during financial due diligence:

  • Revenue that outpaces cash. Sales grow, but bank deposits don’t keep up.
  • Receivables that keep climbing faster than revenue, or customers who never seem to pay.
  • Margins that look too good compared with industry peers.
  • Big revenue spikes at period end, especially right before the sale.
  • Tax returns that don’t match the financial statements you were given.
  • Resistance to access, such as refusing to share bank statements or insisting on “summary” reports only.
  • Related-party transactions with entities owned by the seller or their family.

For a deeper look at spotting anomalies in large data sets, see our guide to data analytics in fraud detection.

A Practical Financial Due Diligence Checklist

A starting framework, not a substitute for professional review:

  1. Run a proof of cash. Reconcile reported revenue to bank deposits for 12 to 24 months, using statements obtained directly from the bank with the seller’s authorization.
  2. Match books to tax returns. Have the seller request IRS tax return transcripts using Form 4506-T and compare them to the financial statements. Big gaps need an explanation. Our post on tax fraud vs. tax evasion vs. tax avoidance explains why the line matters.
  3. Test the top customers. Confirm balances directly with major customers.
  4. Search for hidden debt. Check UCC filings, liens, and loan statements. Undisclosed financing is a common surprise; see our merchant cash advance red flags.
  5. Review vendors and payroll. Look for ghost vendors, duplicate invoices, and expenses paid from outside accounts (see fake invoice scams).
  6. Commission a quality of earnings review from an independent accounting firm for larger deals.
  7. Protect yourself in the contract. Work with deal counsel on strong representations, escrow or holdbacks, and clear earn-out definitions.

When to Call a Fraud Investigator

Standard financial due diligence confirms the numbers. A forensic investigation finds out why they don’t add up. Bring in an investigator when:

  • The seller’s explanations keep changing
  • Documents look altered, or metadata doesn’t match the claimed dates (see following the digital trail)
  • You discover a problem after closing and need evidence for a claim or lawsuit

If fraud surfaces after you take over, our practical framework for internal fraud investigations walks through next steps, and you should involve legal counsel early to protect evidence and your rights.

Conclusion: Verify Before You Wire

A business purchase is only as good as the numbers behind it. Cooked books hide in cash that doesn’t match revenue, tax returns that tell a different story, and sellers who resist simple requests. Thorough financial due diligence turns those hiding places into checkpoints.

If something in a deal doesn’t add up, don’t let closing pressure override your instincts. Contact FraudOrder to talk with an independent investigator before you sign.

Frequently Asked Questions

What is financial due diligence when buying a business?

Financial due diligence is the process of verifying a company’s financial records before you buy it. It tests revenue, expenses, assets, debts, and cash flow against independent sources. The goal is to confirm you’re paying for real, sustainable earnings.

How long does financial due diligence usually take?

It depends on the size of the business and how quickly the seller provides records. Small deals may take a few weeks; larger ones take longer. A seller who stalls on documents is a red flag in itself.

Is a quality of earnings report the same as a fraud investigation?

No. A quality of earnings review assesses whether reported earnings are accurate and sustainable, while a fraud investigation focuses on intentional deception and gathering evidence. For larger or higher-risk deals, buyers may need both.

What are the biggest signs that a seller’s books are cooked?

Revenue that doesn’t match bank deposits, tax returns that contradict the financial statements, period-end sales spikes, and resistance to sharing source documents. Any one deserves a closer look.

What can I do if I discover fraud after closing?

Preserve all records, avoid confronting the seller without guidance, and contact legal counsel quickly. Depending on your contract, you may have claims under representations and warranties, escrow, or insurance.

Can FraudOrder help review a business before I buy it?

An independent investigator can review red flags, trace transactions, and test whether documents hold up. [CLIENT TO CONFIRM: describe FraudOrder’s actual pre-acquisition review service.] Reach out through our contact page to discuss your situation.

References

Disclaimer

This article is for informational purposes only and is not legal, financial, accounting, or professional advice. Reading it does not create a client relationship with FraudOrder. Consult qualified attorneys, accountants, and investigators about your specific situation. For questions about FraudOrder services, visit https://fraudorder.co/