- The Workplace Safety and Insurance Board (WSIB) administers Ontario's no-fault workplace insurance system.
- Ontario's workplace insurance legislation can, in certain circumstances, make a purchaser of a business responsible for a seller's unpaid WSIB amounts relating to that business.
- The WSIB question shows up differently depending on structure: In both structures, the underlying goal is the same: know, before you close, whether the business you're acquiring is clean…
If you're buying an Ontario business that has employees, at some point your lawyer will likely ask the seller for a WSIB clearance certificate. It's a small piece of paper compared to the rest of the closing package, but skipping it can leave a buyer holding a debt they never agreed to take on.
Here's what a clearance certificate actually confirms, why it matters more in some deal structures than others, and how to build the request into your closing timeline.
What the WSIB Is, and What the Certificate Confirms
The Workplace Safety and Insurance Board (WSIB) administers Ontario's no-fault workplace insurance system. Employers in most industries pay premiums into the system, and in exchange, injured workers receive benefits without having to sue their employer directly.
A clearance certificate is the WSIB's confirmation, as of a given date, that an employer's account is in good standing — no overdue premiums, no outstanding penalties or interest owing on the account being checked.
Not every business is required to register with the WSIB. Whether the seller's business is a covered employer depends on its industry and structure, so this is worth confirming early rather than assuming either way.
Why Buyers Ask for One
Ontario's workplace insurance legislation can, in certain circumstances, make a purchaser of a business responsible for a seller's unpaid WSIB amounts relating to that business. That risk is exactly why a clearance certificate has become a standard item on the closing checklist for Ontario business purchases, particularly where the seller has ever had employees.
A buyer who closes without checking this can end up inheriting a debt that had nothing to do with the deal price they negotiated — and that debt relates to a government account, not a private contract, which makes it harder to simply ignore.
Asset Deals vs. Share Deals
The WSIB question shows up differently depending on structure:
| Asset Purchase | Share Purchase | |
|---|---|---|
| Whose WSIB account is at issue | The seller's account tied to the business/assets being sold | The target corporation's own account, which the buyer now owns entirely |
| Why a clearance certificate matters | Protects the buyer from stepping into the seller's shoes on WSIB liability for the business being acquired | The corporation's WSIB history comes with it either way — clearance confirms there's no surprise debt sitting on the books |
| Typical approach | Closing condition: seller delivers a current clearance certificate, or the purchase price is adjusted/held back until one is obtained | Addressed through representations and warranties about the corporation's compliance history, backed by due diligence |
In both structures, the underlying goal is the same: know, before you close, whether the business you're acquiring is clean with the WSIB — and if it isn't, decide who's responsible for fixing it.
Building It Into Your Closing Timeline
- Request it early. A clearance certificate reflects a snapshot in time, so it's usually requested close to closing rather than at the start of due diligence, once the deal is reasonably certain to proceed.
- Make it a closing condition. Your purchase agreement can require the seller to deliver a current certificate as a condition of closing, rather than leaving it as an afterthought.
- Have a fallback plan. If the seller can't produce a clean certificate on time, options include a price holdback, an escrow arrangement, or a specific indemnity addressing WSIB exposure until the account is confirmed clear.
- Don't assume it's irrelevant because the seller has "just a few employees." The size of the payroll doesn't change whether the successor-liability risk exists — it changes how much money might be at stake.
Frequently asked questions
Does every Ontario business purchase need a WSIB clearance certificate?
Not every one — it depends on whether the seller's business is a covered employer under WSIB rules. But it's worth checking on essentially every deal involving employees, rather than assuming it doesn't apply.
What if the seller refuses to get a clearance certificate?
That's a red flag worth taking seriously. It may mean there's an outstanding balance the seller would rather not disclose. Your lawyer can build protection into the agreement — a holdback, an indemnity, or a closing condition — but a flat refusal to even request one should prompt closer questions.
Is a WSIB clearance certificate the same as general insurance due diligence?
No. General due diligence looks at the seller's own insurance coverage (liability, property, and so on). A WSIB clearance certificate is specifically about the seller's standing with Ontario's workplace insurance system, which carries its own separate successor-liability risk for a purchaser.
Who typically pays for or requests the certificate?
This is a negotiated point in the deal, like most closing logistics. In many deals the seller obtains and delivers it as part of its closing obligations, since the seller is the one with the WSIB account and history.
This is a business purchase or sale question
Start a file online — flat, published fees, reviewed by a licensed Ontario lawyer before a dollar is owed.