Ontario's Two-Year Limitation Period: What It Means for Your Civil Lawsuit

You were wronged — a contractor left your renovation unfinished, a neighbour damaged your fence, a former business partner walked away with money that was yours. You know you have a claim. What you may not know is that Ontario law gives you a limited window to act on it.

The Ontario two-year limitation period is the most important deadline in civil litigation. Miss it, and you may be permanently barred from suing, no matter how strong your case is. Understanding how it works — and when it starts — can be the difference between getting your day in court and losing your rights entirely.

What Is the Basic Limitation Period?

Ontario's Limitations Act, 2002 establishes a general rule: most civil claims must be started within two years of the date the claim was "discovered." This applies to the vast majority of disputes — broken contracts, property damage, personal injury, unpaid debts between private parties, and many others.

As of writing, this two-year window is the default rule. Always verify your specific deadline with a lawyer because exceptions exist and the law can change.

The two-year period is called the "basic" limitation period because it sits alongside a longer backstop called the ultimate limitation period (discussed in a separate article). Both can apply to the same claim.

When Does the Clock Start? The Discovery Rule

The two years do not necessarily start on the day the harmful event occurred. Ontario law uses a discoverability rule: the clock starts on the day you knew — or ought reasonably to have known — all of the following:

• That the injury, loss, or damage occurred
• That the injury was caused by an act or omission of another person
• That the other person's act or omission was negligent or wrongful
• That a proceeding would be an appropriate way to seek a remedy

This matters enormously in practice. If a contractor's faulty work was hidden inside your walls and you only discovered the damage two years after the renovation, the clock may only start running when you (reasonably) found out about it — not when the work was done.

What "Ought Reasonably to Have Known" Means

You cannot simply close your eyes to warning signs and claim the clock never started. Courts look at what a reasonable person in your position would have investigated and uncovered. If obvious red flags existed, you may be treated as having known — even if you chose not to look.

Speak to a lawyer early. The question of when a claim was "discovered" is often the first battleground in a limitation dispute.

Common Scenarios Where the Two-Year Period Applies

Breach of Contract

If someone breaks a contract — fails to deliver goods, abandons a project mid-way, refuses to pay — the clock typically starts when the breach occurs and you become aware of it.

Negligence and Personal Injury

In car accident cases, slip-and-fall claims, or professional negligence matters, the two-year period usually begins when you knew or should have known that your injury was caused by someone else's negligence.

Property Damage

Damage to your home, vehicle, or personal property follows the same basic rule: discovery of the damage and its cause starts the clock.

Defamation

Defamation claims have the same two-year default, though the discovery analysis can be nuanced depending on when the statement was published and when you found out.

What Happens If You Miss the Deadline?

A defendant whose claim is time-barred can bring a motion to dismiss your case before it even reaches a hearing. If the court agrees the limitation period has passed, your claim is extinguished — not just delayed. You generally cannot revive it.

This is one of the harshest outcomes in civil litigation. You may have suffered real harm, have clear evidence, and face a defendant who clearly wronged you — but if you waited too long, none of that may matter.

Exceptions and Complications to Be Aware Of

The two-year rule is the default, not a rigid formula. Several factors can alter the calculation:

• Minors and incapable persons — the clock may not run until they reach the age of majority or regain capacity
• Fraudulent concealment — if a defendant deliberately hid their wrongdoing, courts can adjust when discovery occurred
• Claims against the government — special notice requirements can apply on much shorter timelines
• Contractual limitation clauses — some contracts try to shorten (or extend) the period; these clauses have limits under the Act

None of these exceptions are automatic. You need a lawyer to assess whether any of them apply to your situation.

Why "I'll Deal With It Later" Is Dangerous

People procrastinate on legal matters for understandable reasons — stress, cost concerns, hope that the dispute will resolve on its own. But limitation periods do not care about your reasons. They keep running regardless.

Even if you are actively negotiating with the other side, the clock does not stop (with narrow exceptions). Many plaintiffs have discovered too late that settlement talks they thought were progressing — and which seemed to make filing a lawsuit feel premature — had actually allowed their limitation period to expire.

The safest approach: consult a lawyer before the two-year mark arrives, ideally long before.

Frequently asked questions