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Assignment Clauses in an Ontario Business Sale Agreement: Can the Buyer Flip the Deal?

What an assignment clause in an Ontario business purchase agreement lets a buyer do, why sellers negotiate around it, and what stays their responsibility.

Buying & Selling a Business6 min readTSLBy the Treadstone Law team · OntarioUpdated 2026-07
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Key takeaways
  • In a business purchase agreement, assignment usually refers to the buyer's right to transfer its rights and obligations under the agreement to another person or entity before closing —…
  • There are several ordinary, non-suspicious reasons a buyer negotiates for assignment flexibility: - Tax and liability planning.
  • A seller does not need to refuse an assignment clause outright, but should not accept an unrestricted one either.

Buyers of an Ontario business rarely sign the purchase agreement in their own personal name and then close in that same name. Instead, most buyers want the right to assign the agreement — to name a corporation, holding company, or other acquisition vehicle as the entity that actually takes ownership at closing. An assignment clause is what makes that possible, and it is one of the more heavily negotiated boilerplate provisions in the entire agreement.

Sellers are not always comfortable signing a deal with one party and then discovering, weeks later, that a different entity entirely is showing up at the closing table. This article explains what an assignment clause typically does, why buyers ask for it, and what a seller should insist on in exchange.

What "Assignment" Actually Means Here

In a business purchase agreement, assignment usually refers to the buyer's right to transfer its rights and obligations under the agreement to another person or entity before closing — most often a numbered company or holding corporation the buyer sets up specifically to acquire the business. This is different from assigning a lease or a customer contract that belongs to the target business itself; it is about who stands in the buyer's shoes on closing day.

There is an important legal distinction between assigning rights and delegating obligations. A buyer can generally transfer the benefit of a contract fairly freely unless the agreement says otherwise, but transferring the duty to perform — including the duty to pay the purchase price — usually requires the other party's consent, because the seller has a legitimate interest in knowing who is actually on the hook.

Why Buyers Want an Assignment Right

There are several ordinary, non-suspicious reasons a buyer negotiates for assignment flexibility:

None of this changes what is being bought — it changes who legally holds it.

What Sellers Should Ask for in Return

A seller does not need to refuse an assignment clause outright, but should not accept an unrestricted one either. Reasonable protections include:

These protections let the buyer restructure how it holds the business without leaving the seller exposed to an unknown or under-capitalized stranger at closing.

Assignment vs. Novation: A Key Distinction

ConceptWhat HappensEffect on Original Buyer
Assignment (without release)Buyer transfers its interest to the new entityOriginal buyer typically remains liable unless released
NovationA new agreement effectively replaces the original buyer with the new entity, with the seller's consentOriginal buyer is released from further liability

Many purchase agreements use the word "assignment" loosely to cover both situations, which is exactly why the specific wording matters. A seller who wants the comfort of an ongoing backstop should make sure the clause does not accidentally release the original buyer.

Frequently asked questions

Can a seller simply refuse to allow any assignment?

Yes — an assignment right is not automatic; it exists only if the agreement grants it. Sellers can negotiate to prohibit assignment entirely, restrict it to affiliates, or require their consent for any assignment, and many purchase agreements include exactly these kinds of limits.

Does assigning the agreement change what's being purchased?

No. Assignment changes who legally takes ownership at closing; it does not change the assets, shares, price, or other terms the parties negotiated, unless the agreement is separately amended.

If the buyer assigns to a new company, is that company automatically liable for everything?

Generally the assignee takes on the assigned rights and obligations going forward, but whether the original buyer is also released depends entirely on the specific wording the parties agreed to — this is not automatic and should never be assumed either way.

Is an assignment clause different in an asset purchase versus a share purchase?

The core mechanics are similar, but the practical stakes can differ: because a share purchase means the buyer inherits the target company's full history, a seller may have a stronger interest in knowing exactly which entity will be answerable after closing.

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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