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Due Diligence When Buying a Small Business in Ontario

Which records, contracts, financials and searches to review when buying a small business in Ontario, and the red flags that should change the deal.

Buying & Selling a Business5 min readTSLBy the Treadstone Law Team · OntarioUpdated November 1, 2026
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Key takeaways
  • Due diligence means checking what the seller has told you against searches, records and contracts before you close.
  • Searches of the Ontario Business Registry and the PPSR show a business's public profile and registered security interests.
  • Employee, WSIB and tax liabilities can follow the business in some structures, so findings should change the price or terms.

Due diligence is the checking you do between agreeing on a deal and closing it. You are testing what the seller has said about the business against documents, searches and the people who run it.

In a small business the records are often informal and the owner is the business. That makes the review more important, not less. What follows is a general guide to what buyers commonly check and what should make you pause.

Start with who the seller is and what they own

Anyone can search the Ontario Business Registry for basic information about a business. Ordering search products directly from the ministry costs $8 for a profile report, $3 for document copies and $26 for a certificate of status, and intermediaries may charge extra service fees.

Then search for registered security interests. Ontario's Personal Property Security Registration is a public database of registrations under the Personal Property Security Act and the Repair and Storage Liens Act, searched against an individual debtor, a business debtor or a motor vehicle, one transaction at a time. It does not cover real property. Run searches under the corporation's name and any trade names, and under the owner's name if the business is a sole proprietorship.

This matters because a buyer of a business's assets outside the ordinary course does not get the protection that ordinary-course buyers of goods receive. A lender's lien could still be attached to what you are buying unless it is discharged at closing.

Financial and tax records

How the deal is structured changes what you inherit. In a share purchase, the change in ownership does not affect the tax values of the corporation's assets, and buying shares is generally not subject to GST/HST. In an asset purchase, you may need your own business number and accounts.

If the seller is a spouse, common-law partner, a person under 18 or otherwise not at arm's length, the transferee-liability rules matter: the person receiving property can be jointly and severally liable for the transferor's tax debts, up to a cap. The same type of rule applies to unpaid GST/HST. Property transferred between separated spouses under a court order, judgment or written separation agreement is treated differently for the GST/HST rule.

Employees, WSIB and contracts

Ask for a list of employees, start dates, pay and written terms. If you employ the seller's people, their time with the seller counts for Employment Standards Act, 2000 purposes, including notice of termination and severance pay. An employee with at least three months of employment is entitled to notice or pay instead, from 1 week for under a year of service up to 8 weeks for 8 years or more. Severance pay can be owed where the employee has at least five years and the employer has a payroll of at least $2.5 million, up to 26 weeks.

On WSIB, when an employer sells or otherwise disposes of all or part of its business, the buyer is liable for amounts the employer owed under the Act just before the sale. The WSIB says asset buyers should get a purchase certificate, requested before the date of sale and valid for 30 days. It is issued only if the seller's account is in good standing, with amounts paid and reports filed, and not while an issue is under appeal.

Also read every key contract for clauses that end or change when ownership changes, and read the lease for assignment restrictions. If a lease bars assignment without consent, it is deemed to say consent cannot be unreasonably withheld, unless the lease expressly says otherwise.

Franchises need extra review

If the business is a franchise, the franchisor must give you a disclosure document at least 14 days before you sign or pay. It should include the franchisor's litigation history, financial statements, costs, proposed agreements, territory, supplier restrictions and a list of current and former franchisees. Call some of those franchisees. Exceptions exist, such as a resale by an existing franchisee that is not effected through the franchisor, so ask your lawyer whether disclosure applies.

Red flags that should change the deal

FindingWhat it may mean for the deal
Registered liens on equipment or inventoryRequire discharges at closing or adjust the price
Seller's WSIB account not in good standingA purchase certificate may not be issued
Numbers on tax filings differ from the seller's claimsRe-price, or walk away if the conditions allow
Lease needs consent and the landlord is hesitantMake landlord consent a condition
Key staff unwilling to stayTest whether the business works without them

A red flag is a reason to renegotiate, add a protection to the agreement, or decide not to proceed. Put what you are relying on into the agreement as the seller's statements, and keep the right to leave if the checks fail.

What to do next

Frequently asked questions

How long should due diligence take?

It depends on the size and records of the business, and the agreement sets the deadline. Make sure the review period is long enough to receive documents and run searches before your conditions expire.

What does a PPSR search show?

It shows registrations under the Personal Property Security Act and the Repair and Storage Liens Act against an individual debtor, a business debtor or a motor vehicle. It does not cover real property.

Can I inherit the seller's unpaid WSIB amounts?

In an asset purchase, the buyer is liable for amounts the employer owed just before the sale. A valid purchase certificate protects you, and the WSIB says it must be requested before the sale date.

Do I do the same checks in a share purchase?

Yes, and arguably more. In a share purchase the corporation's WSIB account, including amounts owing, stays with the corporation. You are buying the company with its history.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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