What is a WSIB purchase certificate?

In an asset sale, the WSIB says a purchase certificate should be requested before the sale date. A valid certificate confirms the seller has coverage and no outstanding debts. It is valid for 30 days from issue, so its timing has to line up with closing.

Is a WSIB certificate needed in a share sale?

According to the WSIB, no, because no new legal entity is created. The share purchase agreement is submitted and the account is updated. Your lawyer will handle the details.

Does Ontario have a provincial sales tax clearance?

Ontario uses the harmonized sales tax rather than a separate provincial sales tax, so the sales-tax questions in an asset sale run through the federal GST/HST rules, including the possible joint election on Form GST44. Your accountant decides whether it applies.

Exit Readiness in Ontario: Preparing to Sell an Ontario Firm

Ontario is Canada's most populous province, and owner-led businesses here, from the GTA through Ottawa, Hamilton, London and the North, can usually draw on a wider field of potential buyers than anywhere else in the country. More buyers also means more competing sellers, and better-prepared ones. A business that can answer diligence questions quickly stands out. Ontario also has one sale-specific step that catches out unprepared sellers: the WSIB purchase certificate.

This page summarizes official sources as of October 2026. It is not legal or tax advice.

Who buys Ontario businesses

The GTA (Toronto, Mississauga, Brampton, Markham, Vaughan) has the broadest mix of buyers: competitors consolidating, larger companies expanding, private investors and individual buyers. Ottawa, Hamilton and London have active markets of their own. In Northern Ontario and smaller towns, the pool is thinner, and internal routes are more common.

Where buyers are plentiful, they compare. An Ontario seller is often competing against other businesses in the same sector for a buyer's attention, so presentation and speed count. A complete data room and a well-supported earnings schedule are not just defensive; they help a business stand out. See deal preparation.

Seasonality across the province

The lakes take the edge off winter across much of southern Ontario, but north of the shield country the cold arrives sooner and stays far longer. Cottage-country, tourism, construction and outdoor businesses follow sharp seasonal curves, and northern businesses even more so.

For a seller, that calls for monthly results, month-end working capital, and clear notes explaining unusual seasons. The normalized earnings guide covers how buyers adjust for them.

The WSIB purchase certificate

The WSIB's buying or selling your business page sets out the rules:

Asset sales: a purchase certificate should be obtained, and the request must be made before the date of sale. A valid certificate confirms the seller has coverage and no outstanding debts.
Validity: the certificate is valid for 30 days from issue. If closing slips past that window, another can be requested.
Risk: without a valid certificate, the WSIB may hold the buyer liable for amounts the seller owed up to the sale date.
Share sales: no purchase certificate is required, because no new legal entity is created. The share purchase agreement is submitted and the account is updated.
After an asset sale, the seller still submits a closure request stating the last day employees worked for them.

For readiness, keep the WSIB account current, resolve arrears long before going to market, and keep account details in the data room. The 30-day validity makes it a closing-timeline item your lawyer will want to plan.

Registry and tax points

Ontario Business Registry for Ontario corporations' filings, including annual returns. Federal corporations also keep records with Corporations Canada.
HST. Ontario uses the harmonized sales tax. In an asset sale, buyer and seller may be able to jointly elect that no GST/HST applies, using Form GST44, if the conditions are met. Your accountant decides.
Leases. Many commercial leases require landlord consent to an assignment or a change of control. Review yours early with your lawyer.

A question to take to your lawyer

Ask how the 30-day validity of the WSIB purchase certificate fits your expected closing date, and who will request it. It is a small detail that is easy to plan and awkward to rush.

How we would prepare an Ontario business

Plan to compete for attention. A complete data room and a clear business profile help a buyer choose you.
Clean up the WSIB, HST and payroll accounts during valuation readiness.
Check lease and contract assignment early.
Reduce owner dependence, because a buyer with alternatives will discount a business that runs through its founder.
Keep a back-up route, since buyers who have options can also walk away.

We work with Ontario owners in person or by video call, as well as by phone, text and email. Compare other provinces on the areas page, or call, text or email.

Exit readiness in Ontario