Does a Collective Agreement Survive a Business Sale in Ontario?

If a business changes hands, does the union contract that governed it the day before still apply the day after? It’s one of the first questions both buyers and sellers ask once they learn a union is in the picture — and the honest answer is that it depends on how the deal is structured, and on the specific facts of the transaction.

Here’s how to think through it.

The Short Answer

• Share sale: Yes, essentially automatically. The employer — the corporation — doesn’t change, so the collective agreement it signed continues to bind it exactly as before.
• Asset sale: It depends. Because a different legal entity is taking over the business, whether the collective agreement carries forward turns on Ontario’s successor rights doctrine — a fact-specific analysis, not an automatic yes or no.

Why a Share Sale Doesn’t Raise the Question

In a share sale, ownership of the shares changes, but the corporation that is party to the collective agreement stays exactly the same legal entity. There is no "new employer" for the agreement to bind — it simply continues to apply, under new ownership, until it expires or is renegotiated in the ordinary course.

Why an Asset Sale Is Different

In an asset sale, the buyer is typically a separate legal entity from the seller’s corporation. The collective agreement was signed by the seller’s corporation, not by the buyer. For it to bind the buyer, Ontario’s successor rights provisions have to apply — generally requiring that the business, or a substantial part of it, transferred and continues operating as substantially the same enterprise under the new owner.

If successor rights apply, the buyer can be bound by the existing agreement even without having signed it. If they don’t apply — because, for example, only a narrow slice of assets changed hands and the character of the enterprise genuinely changed — the buyer may not be bound in the same way. This is a determination that depends heavily on the specific facts and, where disputed, on the Ontario Labour Relations Board.

What a Buyer Inherits If the Agreement Does Survive

1. Wage and benefit terms as written, until the agreement’s own renewal cycle.
2. Seniority, layoff, and recall provisions, which can affect how you manage staffing changes.
3. Grievance and arbitration procedures, including responsibility for grievances that arose before closing, depending on how the purchase agreement allocates that liability.
4. The certified bargaining unit, meaning ongoing bargaining and representation obligations continue with the union.

What Doesn’t Change Just Because You Bought the Business

• You can’t unilaterally rewrite the collective agreement’s terms because of the sale — changes still require bargaining or agreement expiry.
• You can’t treat a "fresh start" as a reason to disregard existing grievances or past practices without addressing them properly.
• You can’t assume the agreement lapses just because the ownership did — expiry dates and renewal cycles are set by the agreement and labour law, not by a change of hands.

Why This Should Be Resolved Before You Sign, Not After

Waiting until after closing to figure out whether a collective agreement binds the buyer puts everyone in a difficult position — the union expects continuity, employees expect certainty, and the buyer may already have made staffing or pricing decisions based on an incorrect assumption. Because the successor rights analysis looks at how the transaction was actually carried out, it’s also something a lawyer can help you plan for in advance, rather than only assess after the fact. That makes it a due diligence item, not a closing-day surprise.

Frequently asked questions