How Long Can a Seller's Non-Compete Last in an Ontario Business Sale?

There's no chart or fixed rule that tells you exactly how many years a seller's non-compete can run in an Ontario business sale. That surprises a lot of buyers and sellers, who often assume there must be a standard number everyone uses. Instead, non-compete duration is assessed for reasonableness against the specific deal — and getting it wrong in either direction has real consequences: too short, and the buyer hasn't actually protected what they paid for; too long, and a court may refuse to enforce the clause at all.

This article explains how reasonableness is assessed, what pushes a duration longer or shorter, and what happens if a clause goes too far.

Why Duration Is Usually the First Question a Court Asks

A non-compete is a restraint on someone's ability to earn a living and compete freely in the market — something courts have traditionally treated with some caution, even where the clause was bargained for as part of selling a business. Duration is one of the first things a court examines because it's a fairly direct measure of how much ongoing restriction the seller agreed to accept, and how much of that restriction is actually necessary to protect what the buyer paid for.

A seller's non-compete tied to a genuine business sale is generally treated more favourably by courts than an employee non-compete, because it was negotiated as part of the price paid for the business and its goodwill, rather than imposed on someone in a weaker bargaining position. That more favourable treatment isn't unlimited, though — an excessively long restriction can still be found unreasonable even in a sale context.

What Makes a Duration "Reasonable"

There's no fixed number of years that's automatically safe, and none that's automatically too long. Instead, reasonableness tends to turn on questions like:

• What was actually purchased. A buyer who paid specifically for the business's goodwill and customer relationships has a stronger case for a duration long enough to let those relationships transfer and stabilize under new ownership.
• How quickly the buyer could reasonably establish independent customer loyalty. A duration that runs well past the point where the buyer could realistically compete on their own merits starts to look more like punishing the seller than protecting a legitimate interest.
• The nature of the industry. Some businesses depend on relationships that take considerable time to earn; others turn over customers relatively quickly. The same duration can be entirely reasonable in one industry and excessive in another.
• What else the seller agreed to. A non-compete that's one part of a broader package — alongside separate non-solicitation and confidentiality obligations — may be assessed differently than one asked to do all the protective work alone.

Factors That Tend to Push Duration Longer or Shorter

What Happens If the Clause Is Too Long

If a court finds a non-compete's duration unreasonable, the consequences can be more severe than simply trimming it down to something acceptable. Depending on how the clause and the rest of the agreement are drafted, an unreasonable restriction can render that entire covenant unenforceable — not just the portion of time beyond what the court considers reasonable. Courts are generally reluctant to rewrite a badly drafted restrictive covenant into a reasonable one; whether a court will sever an unenforceable portion and leave the rest standing depends heavily on how the clause itself is structured, and shouldn't be assumed either way without a lawyer's review.

That risk is exactly why an overly aggressive duration can backfire on the very buyer it was meant to protect — an unenforceable non-compete provides no real protection at all.

Practical Guidance for Drafting

1. Tie the duration to a genuine business reason — how long it will realistically take to secure the goodwill being purchased — rather than picking a number because it "sounds standard."
2. Coordinate duration with the scope of the restricted activity and geographic area; a narrower restriction in one dimension can often support a longer, more defensible duration overall.
3. Consider whether a step-down or tiered structure (progressively narrowing restrictions over time) better reflects the actual risk than a single flat period.
4. Document, within the agreement or supporting materials, why the specific duration was chosen — this record can matter if the clause is ever challenged.
5. Have the clause reviewed by a lawyer familiar with Ontario restrictive covenant law before signing, on both sides of the deal.

Frequently asked questions