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Tax Clearance Certificates When Buying a Business in Ontario

Learn which certificates and checks protect you from a seller's unpaid taxes and WSIB amounts when buying a business in Ontario, and when they apply.

Buying & Selling a Business6 min readTSLBy the Treadstone Law Team · OntarioUpdated November 6, 2026
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Key takeaways
  • There is no single all-purpose tax clearance certificate in Ontario; the protection you need depends on whether you buy assets or shares and on what the seller owes.
  • Ontario's Bulk Sales Act was repealed on March 22, 2017, but a WSIB purchase certificate and a few tax rules still matter.
  • Transfers to a spouse, common-law partner, minor or other non-arm's-length person can make the buyer liable for the seller's tax debts.

If you are buying a business, you may worry that the seller's unpaid taxes will become your problem after closing. Searching for a tax clearance certificate is a sensible instinct, but in Ontario the term covers several different documents and rules, and not all of them apply to every deal.

This article explains the main checks and certificates that come up, how they differ between an asset purchase and a share purchase, and the special cases where a buyer can inherit a seller's debts. A lawyer or accountant can confirm which apply to your deal.

Why there is no single clearance certificate

Many buyers expect a government office to issue one certificate that says the seller owes nothing. Ontario does not work that way. Different agencies deal with different debts, and each has its own rule about buyer liability.

Older materials often tell buyers to follow bulk sales procedures. Ontario's Bulk Sales Act, R.S.O. 1990, c. B.14 was repealed on March 22, 2017, and buyers of business assets no longer have to comply with bulk sales procedures. Pages that still say otherwise are out of date.

AreaWhat may protect the buyerWhere it applies
Workplace insurance (WSIB)Purchase certificateAsset purchases
Retail sales taxCertificate from the MinisterBulk sales by sellers who hold or must hold a vendor permit
GST/HSTJoint election on Form GST44Purchase of all or substantially all of the business property
Non-resident sellerCRA clearance certificateTaxable Canadian property

Asset purchase or share purchase

The structure of the deal changes your exposure. In a share purchase, the corporation stays the same legal entity. The WSIB says no new legal entity is created, so no purchase certificate is required, and the corporation's WSIB account, including any amounts owing, stays with the corporation. The CRA also says a change in share ownership does not affect the tax values of the corporation's assets.

In other words, if you buy shares you take the company as it is, debts included. That makes searches and written protections in the purchase agreement especially important. In an asset purchase, the buyer may need a new business number and its own payroll and GST/HST accounts.

The WSIB purchase certificate

When an employer sells, leases, transfers or otherwise disposes of all or part of its business, the buyer is liable for all amounts the employer owed under the Workplace Safety and Insurance Act, 1997 immediately before the disposition. A buyer in an asset purchase should get a purchase certificate.

There is an exception for certain insolvency buyers. Trustees in bankruptcy, court-appointed receivers or receiver-managers, certain liquidators and persons acquiring a business under the Companies' Creditors Arrangement Act are excluded from the buyer liability in s. 146. Do not confuse this certificate with the WSIB clearance certificate used when hiring contractors, which is a different document.

Other tax exposure to check

Retail Sales Tax Act s. 6 still applies to a sale in bulk by a person who holds, or must hold, a vendor permit. The seller must first obtain a certificate from the Minister showing that the listed taxes are paid, and a buyer who does not get the duplicate certificate is responsible to the Minister for the seller's unpaid taxes, penalties and interest.

For GST/HST, a buyer who acquires all or substantially all (at least 90%) of the property needed to carry on the business can jointly elect with the seller on Form GST44 so that no GST/HST is payable on the sale. The form must be filed on or before the day the buyer's GST/HST return is due for the first reporting period in which GST/HST would otherwise have been payable. The election cannot be used if the seller is a registrant and the buyer is not, and GST/HST can still apply to some items, such as services the seller supplies and leased property.

Two special cases can create buyer liability for the seller's debts. First, if property comes from a spouse or common-law partner, a person under 18 or anyone not dealing at arm's length, the recipient can be jointly liable for the transferor's income tax debts, up to a cap. A similar rule applies to unpaid GST/HST. For separated spouses transferring under a court order, judgment or written separation agreement, the property's fair market value is deemed nil for the GST/HST rule.

Second, if the seller is a non-resident selling taxable Canadian property and the CRA has not issued a clearance certificate, the buyer must remit 25% of the amount by which its cost exceeds the certificate limit, within 30 days after the end of the month of acquisition. A buyer is not liable if, after reasonable inquiry, it had no reason to believe the seller was non-resident, or if the property is treaty-protected or a s. 116(4) certificate was issued.

What to do next

Because the rules depend on the structure and the people involved, speak with a lawyer or accountant before you sign or pay a deposit.

Frequently asked questions

Is there a bulk sales certificate I need in Ontario?

No general one. The Bulk Sales Act was repealed on March 22, 2017, and buyers of business assets no longer have to comply with bulk sales procedures. A retail sales tax certificate can still matter if the seller holds or must hold a vendor permit.

Do I need a WSIB purchase certificate if I buy shares?

The WSIB says no, because no new legal entity is created in a share sale. The parties submit the Share Purchase Agreement instead, and any amounts owing stay with the corporation.

How long is a WSIB purchase certificate valid?

It is valid for 30 days from its issue date, and it must be requested before the date of sale. Timing it with your closing date is important.

Can I owe the seller's taxes if I buy from a family member?

Possibly. A person who receives property from a spouse, common-law partner, minor or other non-arm's-length person can be jointly liable for the transferor's tax debts, up to a cap. A lawyer can explain how it applies to your transfer.

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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