Guides for buyers · 7 min read

Red flags when buying a small business

By Colton Doan, founder of Sellvara · Updated October 30, 2026

Most sellers are honest, and most businesses for sale are what they appear to be. But buying a business means paying for its past and betting on its future, and some problems only show up if you know where to look. These are the warning signs Canadian buyers and their advisors watch for, and what to do if you see one.

A red flag doesn't always mean walking away. Often it means asking harder questions, getting protection in the purchase agreement, or adjusting the price.

Financial red flags

• "The real numbers are higher than what's on the tax return." A seller who says they earn cash that isn't reported is telling you two things: that the reported figures understate the business, and that they've been willing to mislead the tax authorities. You can't buy or borrow against income that can't be proven, and you may inherit the risk. Value the business on what can be verified.
• Financial statements that don't match tax returns or bank deposits. There can be innocent explanations, but they need to be explained by the seller's accountant.
• Falling revenue or profit, especially in the most recent months. Ask why, and whether it's likely to continue.
• Add-backs you can't verify. Personal expenses and one-time costs are legitimate add-backs only if there are records. Large or vague add-backs inflate the price.
• Unusual spikes in sales just before the sale, which may not be sustainable.
• Unpaid taxes or source deductions. Overdue GST/HST or payroll remittances can follow the business, especially in a share purchase.

Customer and market red flags

• One or two customers make up a large share of revenue. If one leaves after the sale, the business may be worth much less. Ask about contracts and how long the relationships have lasted.
• Customers who are loyal to the owner personally, not the business.
• A declining industry, or a new competitor the seller doesn't mention.
• Contracts that end soon or can be cancelled when ownership changes.

Owner and staff red flags

• The business can't run without the owner. If the owner does all the selling, holds every key relationship and makes every decision, much of the value may leave with them. Plan a long transition, or adjust the price.
• Key employees leaving, or likely to leave after the sale.
• No written processes. Everything is in the owner's head.
• A seller in a hurry without a clear reason, or who won't explain why they're selling.

Legal and property red flags

• A short lease, or a landlord who won't agree to transfer it. For many businesses, location is everything. Check how long is left and whether it can be assigned or renewed.
• Liens on the assets. Ask your lawyer to search the provincial personal property registry for registered security interests, and to confirm they'll be discharged at closing.
• Lawsuits, disputes or regulatory issues, current or threatened.
• Permits or licences that can't be transferred, or that are out of date.
• Intellectual property that isn't owned by the business, such as a website, trademark or software registered in the owner's personal name.
• Environmental issues, especially for automotive, industrial or manufacturing businesses on the property.

Process red flags

• Reluctance to share documents once you've signed an NDA and made a serious offer.
• Pressure to skip due diligence or to close quickly.
• Answers that change when you ask the same question twice.
• Deferred maintenance: equipment that hasn't been looked after, which you'll have to replace soon after buying.

What to do if you see one

1. Ask. Many red flags have reasonable explanations. Ask the seller, in writing if needed.
2. Verify. Have your accountant and lawyer check the explanation against documents.
3. Protect yourself. Your lawyer can add representations, warranties and indemnities to the purchase agreement, or hold back part of the price until a risk has passed.
4. Adjust the deal. Lower the price, change the structure (buying assets instead of shares can leave old liabilities behind; see asset sale vs share sale), or use vendor financing or an earn-out so the seller shares the risk.
5. Walk away if the risk is too high, or the answers don't add up. There will be other businesses.

Common questions

What are the biggest red flags when buying a business?

Financial statements that don't match tax returns, unreported cash income, falling sales, one or two customers making up most of the revenue, a business that depends on the owner, and a short or non-transferable lease.

Should I buy a business with unreported cash income?

Value it only on income that can be verified. You can't borrow against unreported income, and it suggests the seller has been willing to mislead the tax authorities.

How do I check if a business has liens on it?

Ask your lawyer to search the provincial personal property registry for registered security interests, and to make sure they're discharged at closing.

Next steps

Use our due diligence checklist to know what documents to ask for, and read how to evaluate a business listing before you get that far.

This guide is general information, not legal, tax or financial advice. Every sale is different: talk to your own accountant and lawyer before you decide.