- For most employment questions in a business sale, the asset-versus-share distinction is central — it drives whether the employer changes, whether the Employment Standards Act, 2000's…
- A share purchase does not change the employing corporation at all, so whatever union relationship, certification, and collective agreement existed before closing simply continues with…
- An asset purchase is where things get more complicated.
Buying a business with a unionized workforce raises a question that catches some buyers off guard: does structuring the deal as an asset purchase instead of a share purchase let you avoid the existing union relationship? Often, the honest answer is no — and assuming otherwise can leave a buyer bound by a collective agreement it never negotiated.
Labour relations law and employment standards law ask different questions and can produce different answers, which is part of what makes this area easy to get wrong. This article explains the general shape of the issue and why it needs its own specialist review, separate from the usual asset-versus-share analysis.
Why a Union Changes the Structure Conversation
For most employment questions in a business sale, the asset-versus-share distinction is central — it drives whether the employer changes, whether the Employment Standards Act, 2000's continuity rules apply, and who owes what to individual employees. Where a workforce is unionized, there is an additional layer: Ontario's labour relations framework has its own, separate rules about when a certification and collective agreement follow a business that changes hands, and those rules do not always line up neatly with the asset-versus-share line.
Share Purchases: The Union Relationship Continues by Default
A share purchase does not change the employing corporation at all, so whatever union relationship, certification, and collective agreement existed before closing simply continues with the same employer afterward. There is no separate "successor" analysis needed, because nothing about who the employer is has changed.
Asset Purchases: Why "Just Buying Assets" Doesn't Always Avoid the Union
An asset purchase is where things get more complicated. Buyers sometimes assume that because they are only buying assets, not the seller's corporation, they are automatically free of any union relationship the seller had. That assumption is not safe. Labour relations authorities generally look at the substance of what is being sold, not just how the transaction is labelled: if the buyer is effectively continuing the same business — same operations, same location, same workforce — using assets bought from a unionized employer, that can still be treated as a "sale of business" for labour relations purposes, potentially binding the buyer to the existing certification and collective agreement regardless of the asset-purchase label on the deal.
Whether that outcome actually applies to a given transaction depends heavily on the specific facts, and it is a genuinely separate legal question from anything in the Employment Standards Act, 2000.
How This Differs from the Employment Standards Act Analysis
It is worth being explicit about the difference, because the two regimes can produce different results on the very same facts:
| Question | ESA continuity of employment | Labour relations successor rights |
|---|---|---|
| What it governs | Statutory minimum entitlements, such as vacation and notice, for individual employees | Whether a union certification and collective agreement bind the buyer |
| Timing trigger | Whether the buyer hires within roughly 13 weeks | Whether the transaction is, in substance, a "sale of business" |
| Applies to share sales? | Not really engaged — the employer doesn't change | Not really engaged, for the same reason |
| Applies to asset sales? | Yes, if the buyer hires the seller's employees for a going-concern business | Potentially yes, independent of hiring decisions |
A business sale can trigger one of these regimes, both, or neither — you cannot assume the answer to one tells you the answer to the other.
Due Diligence Questions to Ask Before You Decide on a Structure
- [ ] Is there an existing union certification, and does it cover all or part of the workforce?
- [ ] What does the current collective agreement say about its term, wage grid, and any successor or sale-of-business language?
- [ ] Are there outstanding grievances or upcoming bargaining obligations?
- [ ] Is the buyer intending to continue the business in substantially the same form, or restructure it significantly?
- [ ] Has labour counsel reviewed whether this specific transaction is likely to be treated as a "sale of business" under Ontario's labour relations framework?
Getting Labour Advice Early
Because the consequences of getting this wrong run in both directions — unexpectedly inheriting a collective agreement the buyer did not plan for, or a seller mistakenly assuming an asset sale ends its bargaining obligations — this is an area where labour relations advice belongs early in the process, ideally before the deal structure is locked in, not after a letter of intent is signed.
Frequently asked questions
Does structuring the deal as an asset purchase guarantee the buyer avoids the union?
No. Whether a union relationship follows the business depends on the substance of the transaction under Ontario's labour relations framework, not simply on whether the deal is labelled an asset purchase.
If it's a share purchase, is there anything to review on the labour side at all?
Yes. Even though the union relationship continues automatically, buyers still need to understand the terms of the existing collective agreement, any pending grievances, and upcoming bargaining obligations as part of ordinary due diligence.
Can the purchase agreement just say the buyer isn't bound by the collective agreement?
A purchase agreement is a contract between buyer and seller — it cannot unilaterally override what a labour relations board would find about successor rights based on the actual facts of the transaction.
Is this the same 13-week rule that applies to ESA continuity of employment?
No. The Employment Standards Act's 13-week hiring window is a separate concept from labour relations successor rights, and the two should not be conflated when assessing a unionized workforce.
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