WSIB Clearance Certificates in an Ontario Business Purchase: Why Buyers Need One

If the business you're buying has employees, there's a workplace insurance angle to due diligence that's easy to overlook: is the seller's account with Ontario's Workplace Safety and Insurance Board (WSIB) actually in good standing? A WSIB clearance certificate is the document that answers that question, and it's a routine — but genuinely important — item to request before you close.

This article explains what a clearance certificate confirms, why it matters more in some deal structures than others, and when to ask for one.

What a WSIB Clearance Certificate Confirms

Employers who are registered with the WSIB pay premiums into Ontario's workplace insurance system, which in turn funds benefits for workers injured on the job. A clearance certificate is essentially a status check — it confirms whether a specific employer's WSIB account is up to date, with no outstanding premiums owing, as of the date the certificate is issued.

It does not tell you anything about the business's safety record, claims history, or future premium rates — only whether the account is currently in good standing.

Why This Matters When You're Buying a Business

Ontario's workplace insurance system has long included features designed to prevent employers from simply walking away from unpaid premiums by selling or restructuring the business. In practical terms, this means a buyer who takes over a business's operations without confirming the seller's WSIB account is clear can, in some circumstances, face exposure connected to that unpaid balance.

This risk is most relevant to buyers taking over the operating business itself — continuing the same work, in the same industry, often with many of the same employees — rather than a buyer who is only acquiring a narrow set of assets unconnected to ongoing operations. Clearance certificates come up especially often in project-based and contracting industries, where a business's WSIB standing is checked routinely as a matter of course, but any buyer of an operating business with employees can reasonably ask for one.

When to Request the Certificate

• During due diligence, as one of the standard employment-related items you ask the seller to produce
• Again close to closing, since a certificate is only a snapshot as of its issue date and the seller's account status could change in the interim
• As a closing condition or deliverable, so the deal doesn't complete without current confirmation in hand

Checklist: WSIB Due Diligence for Buyers

• [ ] Confirm whether the seller is registered with the WSIB at all (not every business is, depending on its industry and structure)
• [ ] Request a current clearance certificate for the seller's account
• [ ] Ask whether any WSIB claims are open or in dispute that could affect future premiums
• [ ] Get seller representations confirming the account is in good standing as of closing
• [ ] Consider a holdback if a clean, current certificate can't be produced by closing day

Share Deals vs. Asset Deals

In a share purchase, the corporation's WSIB account continues as-is — you're not triggering a new registration, you're simply acquiring a corporation that already has its own account, history, and standing (or lack of it). In an asset purchase, particularly one where the buyer continues the same operations, confirming the seller's account is clear before closing is the more direct protection, since the buyer is stepping into an ongoing operating business rather than simply inheriting a continuing corporate entity.

Frequently asked questions