Limitation Periods in Contract vs. Tort Claims in Ontario: What's the Difference?

When someone wrongs you in Ontario, you might have more than one legal avenue available to you. A contractor who fails to complete your renovation may be in breach of your written contract — but they may also have been negligent in a way that goes beyond what the contract says. A financial adviser who gives you ruinous advice might have breached your service agreement and also committed a tort (civil wrong) by falling below the professional standard of care.

The category of claim you pursue can affect not just your legal strategy, but also when your limitation clock started ticking — and whether it has already expired. Understanding the difference between contract and tort limitation periods is essential before you decide how to frame your case.

The Default Rule: Both Start at Two Years

Ontario's Limitations Act, 2002 sets a two-year basic limitation period that applies to most civil claims, whether they arise in contract or tort (as of writing). In that sense, there is no difference between the two: you generally have two years from the date of discovery to commence your proceeding.

But the devil is in the details — specifically, in when discovery occurs and what triggers the limitation clock for each type of claim.

Breach of Contract: When the Clock Starts

In a breach of contract claim, the limitation period generally begins when the breach actually occurs — that is, when the defendant fails to perform a contractual obligation that was due to be performed.

Clear Breaches vs. Contingent Obligations

If a contractor was supposed to finish your kitchen by March 1 and did not show up, the breach is clear and the clock probably starts around that date. The discoverability analysis is usually straightforward: you knew immediately.

However, if the contract had ongoing obligations — monthly deliverables, phased services, or continuing performance — the breach analysis becomes more complex. Each missed obligation may trigger its own limitation period.

Hidden Defects in Work

If the breach is a latent defect — faulty plumbing hidden inside a wall, a structural weakness not visible to inspection — the discovery rule shifts the starting date forward. You cannot be expected to know your contractor breached a duty of workmanship until you discover (or ought to discover) the defect and link it to the breach.

Written vs. Verbal Contracts

The type of contract does not change the basic two-year period in Ontario. The old common-law distinction between written and verbal contracts that produced different limitation periods does not apply under the current Act (as of writing). Verify this with a lawyer for your specific situation.

Tort Claims: Discovery Can Start Later

In tort claims — negligence, misrepresentation, nuisance, defamation, and others — the limitation clock also starts on discovery. But the discovery analysis can play out differently because what you need to "discover" is more nuanced.

For a negligence claim, you need to know:

• That you suffered damage
• That the damage was caused by someone's negligence (not just bad luck or your own actions)
• That the person's conduct fell below the standard of care
• That suing them would be appropriate

The third element — that the conduct was actually negligent — is where tort discovery can lag behind contract discovery. If a professional made an error that you could not recognize as below the standard of care without expert advice, you may not have "discovered" your tort claim until you consulted an expert who confirmed the negligence.

Example: Professional Negligence

A lawyer missed a filing deadline that harmed your case. You knew the deadline was missed, but you did not know until a second lawyer reviewed the file that the error constituted negligence. The two-year window for your negligence claim may only start from when you reasonably learned the conduct was below the professional standard — not from when the deadline was missed.

Concurrent Claims: Running Two Clocks

A single set of facts often gives rise to both contract and tort claims at the same time. The defendant may be liable for breach of contract and separately liable in negligence.

When this happens, each claim may have a slightly different discovery date. This can work in your favour: if your contract claim has expired because you discovered the breach more than two years ago, your tort claim might still be alive if you only recently discovered the negligence component.

Conversely, the overlap also creates traps. People sometimes focus on the contract claim and overlook the tort angle entirely, not realizing the facts support both — or that one claim may have stronger prospects than the other.

A lawyer will assess both angles when analyzing your file.

Contractual Limitation Clauses: The Wild Card

Many commercial contracts contain clauses that purport to shorten the limitation period — for example, requiring any claim to be brought within 90 days of the breach, or within one year.

These clauses are not always enforceable. The Limitations Act, 2002 limits the parties' ability to contract out of the Act's provisions, particularly in consumer agreements. In commercial contracts between sophisticated parties, more derogation may be permitted, but courts scrutinize these clauses carefully.

If your contract has a notice or claims period that is shorter than two years, have a lawyer review whether that clause is enforceable — before you miss the contractual deadline.

Frequently asked questions