15 Red Flags to Watch for When Buying a Business

Every business looks good in a teaser. The real question is what breaks after you own it. Here are the 15 signals that turn up in diligence and kill deals — or should have.

Financial Red Flags

1. Customer Concentration Above 25%

If one customer represents more than a quarter of revenue, you're buying a job managing that relationship, not a diversified business. If that customer leaves — and they often do after an ownership change — the business loses a quarter of its revenue overnight.

2. Declining Gross Margins

Revenue can grow while margins shrink. If gross margin dropped from 55% to 42% over three years and the seller blames "temporary factors," ask for proof those factors are gone. Usually they're not.

3. Revenue Growth from Price, Not Volume

A business that grew 10% by raising prices 10% didn't grow — it just got more expensive. Look at unit volume. If customer count is flat or falling, the growth is fake.

4. AR Aging Past 90 Days

Receivables over 90 days are probably uncollectible. If 15%+ of AR is in the 90+ bucket, the seller is counting revenue they'll never collect.

5. Owner's Salary Not Reflected in P&L

Many small business owners don't pay themselves a market salary. They take draws or distributions. A business showing $300K in SDE that actually requires a $120K manager isn't a $300K business.

Operational Red Flags

6. Owner Is the Business

If every customer calls the owner directly, every decision routes through them, and no one else knows the passwords — you're buying a job, not a business. Expect 30-50% customer attrition after the owner leaves.

7. No Second-in-Command

If there's no one who can run operations for a week while the owner is sick, you have a key-person risk that banks won't finance.

8. Employee Turnover Above 30%

High churn signals bad management, low pay, or a toxic culture — none of which are fixed by writing a check at close.

9. Stale Inventory

If inventory turnover is slowing and the seller is sitting on product that hasn't moved in 12+ months, that inventory is worth scrap value — not book value.

Legal and Structural Red Flags

10. Pending or Threatened Litigation

Lawsuits are expensive and distract management. If the seller minimizes a pending claim ("it's nothing, our lawyer says it'll settle"), demand to see the complaint and the lawyer's assessment directly.

11. No Written Customer Contracts

If customers operate on handshakes, there's nothing binding them to stay. A business with recurring revenue but no contracts isn't recurring — it's habitual.

12. IP Ownership Gaps

Who wrote the code? Who designed the logo? If contractors built your product without IP assignment clauses, you might not own what you think you own.

13. Change-of-Control Triggers

Some customer and vendor contracts terminate automatically on a change of ownership. Find these before the buyer's lawyer does.

14. Tax Liability Time Bombs

Unfiled payroll taxes, misclassified contractors, sales tax gaps — the IRS and state agencies don't care that "the old owner did it." The liability follows the business.

15. Seller Wants Out Yesterday

Rushed timelines almost always hide something. Divorce, health issues, burnout — the stated reason for selling fast is usually true. But what they're not telling you is also true.