In most Ontario civil cases, the basic limitation period is two years from the date the claim was discovered. However, determining when a claim was legally discovered is not always as simple as identifying the date of the original incident.
The deadline may depend on when the claimant knew, or reasonably should have known, that a loss occurred, who caused it, and whether starting a court proceeding was an appropriate way to seek a remedy. Exceptions and different limitation rules may also apply in certain circumstances.
Because limitation periods are highly dependent on the facts, anyone facing a potential claim should speak with an Ontario civil litigation lawyer as early as possible.
What Is the Basic Limitation Period in Ontario?
A limitation period is the amount of time available to start a legal proceeding. Under section 4 of Ontario’s Limitations Act, 2002, the basic limitation period is generally two years from the day the claim was discovered.
This means that a claimant ordinarily has two years to formally commence the proceeding, not merely to contact the other party, send a demand letter, or begin settlement discussions.
The basic limitation period may apply to many types of civil disputes, including:
- Breach of contract claims
- Unpaid debts and commercial defaults
- Property damage claims
- Partnership and shareholder disputes
- Professional negligence claims
- Certain construction and real estate disputes
- Other claims involving financial loss or harm
However, not every legal claim is governed by the same deadline. Some proceedings are subject to different statutes, notice requirements, contractual provisions, or specific exceptions.
When Does the Two-Year Limitation Period Begin?
A common misconception is that the two-year period always begins on the exact date the act or incident occurred.
Ontario law generally applies a concept known as discoverability. Under section 5 of the Limitations Act, 2002, a claim is generally discovered when the claimant first knew, or reasonably ought to have known, that:
- Injury, loss, or damage had occurred;
- The loss was caused or contributed to by an act or omission;
- The act or omission was that of the person against whom the claim may be made; and
- Having regard to the nature of the loss, starting a proceeding would be an appropriate way to seek a remedy.
The date of discovery is therefore a fact-specific legal question. It may be the date of the underlying event, but it can sometimes be later.
Example: A Hidden Construction Defect
Suppose a contractor completes structural renovations to a commercial property in 2024. In 2026, an engineer conducting an inspection discovers a serious defect concealed behind a finished wall.
The property owner may argue that the claim was not discoverable until the defect was identified because there were no visible signs of the problem and it could not reasonably have been detected earlier.
However, the limitation period would not automatically begin on the inspection date. The surrounding facts would still matter, including whether there were earlier warning signs, when the owner first experienced damage, and when a reasonable person would have investigated further.
This is why a lawyer should review the complete timeline rather than relying only on the date a formal report was received.
Does Trying to Resolve the Dispute Stop the Limitation Period?
Not necessarily.
Parties often attempt to resolve disputes through negotiation, correspondence, mediation, or informal payment arrangements. Those efforts generally should not be assumed to pause or extend the limitation period.
A person may still need to commence a proceeding before the applicable deadline, even while settlement discussions are continuing.
In certain circumstances, a written acknowledgment of liability relating to a debt or other liquidated monetary claim may affect the limitation analysis. However, the statutory requirements are specific, and parties should not rely on an acknowledgment without obtaining legal advice.
Are There Exceptions to Ontario’s Two-Year Limitation Period?
Yes. The two-year period is the general rule, but the Limitations Act, 2002 contains exceptions and provisions that may suspend, alter, or eliminate a limitation period in particular circumstances.
Claims Involving Minors
The basic limitation period generally does not run while the person with the claim is a minor and is not represented by a litigation guardian in relation to that claim.
The limitation analysis may change if a litigation guardian is appointed. It is therefore not always accurate to assume that every minor automatically has two full years after turning 18 to commence a proceeding.
Incapable Persons
The basic limitation period generally does not run while a claimant is incapable of commencing the proceeding because of a physical, mental, or psychological condition and is not represented by a litigation guardian.
The Limitations Act, 2002 presumes that a person was capable unless the contrary is proven. Whether someone was legally incapable of commencing a claim can require medical and factual evidence.
Claims Governed by Other Laws
Certain claims may be governed by different limitation periods or procedural requirements.
For example, proceedings involving land may engage the Real Property Limitations Act. Claims involving governments, municipalities, estates, defamation, insurance, construction matters, and other specialized areas may also involve separate deadlines or notice provisions.
The two-year basic period should therefore never be applied without first identifying the precise nature of the claim.
What Is Ontario’s 15-Year Ultimate Limitation Period?
Ontario also has an ultimate limitation period, which is generally 15 years from the date the act or omission underlying the claim occurred.
The purpose of the ultimate limitation period is to place an outside boundary on potential liability, even where the claimant did not discover the loss until much later.
However, the 15-year period is not absolute in every case. The Limitations Act, 2002 identifies circumstances in which it may not run, including certain periods involving:
- A minor who is not represented by a litigation guardian;
- A person who is incapable and is not represented by a litigation guardian; or
- Wilful concealment or misleading conduct by the person against whom the claim is made.
Continuous acts or omissions can also affect how the date is calculated.
What Happens If the Limitation Period Has Expired?
If a lawsuit is commenced after the applicable limitation period, the defendant may rely on the expired deadline as a defence and ask the court to dismiss the claim.
Potential consequences include:
The Claim May Be Dismissed
Even a claim that appears strong on its merits may be dismissed if it was started too late and no exception applies.
The Claimant May Lose the Ability to Recover Damages
A missed limitation period may prevent the claimant from obtaining compensation or another court-ordered remedy from the defendant.
Additional Legal Costs May Be Incurred
A limitation dispute can create additional motions, evidence, and legal argument. If the claim is dismissed, the claimant may also face an adverse costs award.
Whether a claim is actually out of time should be determined through a detailed legal analysis. A date that appears obvious may not be the legally correct discovery date.
Why You Should Not Wait Until the Deadline Approaches
Preparing a civil claim takes time. A lawyer may need to:
- Review contracts, correspondence, invoices, and financial records;
- Identify the correct parties and their legal names;
- Investigate when the claim was discovered;
- Preserve electronic and physical evidence;
- Consult experts;
- Calculate damages;
- Consider settlement options; and
- Draft and issue the appropriate court documents.
Waiting until the final days before a suspected deadline can make it more difficult to investigate the claim properly and may leave little time to address unexpected issues.
It is generally safer to obtain advice promptly rather than assuming informal discussions will preserve the right to sue.
Speak With a Toronto Civil Litigation Lawyer About Your Deadline
Ontario limitation periods can be difficult to calculate. The relevant date may depend on when the loss occurred, when it was discovered, whether legal proceedings were an appropriate remedy, and whether an exception or another statute applies.
The Toronto civil litigation lawyers at Powell Litigation can review the history of your dispute, identify potential limitation concerns, and advise you on the steps that may be required to protect your legal interests.
If you believe you may have a claim, have received a demand letter, or are unsure whether a deadline is approaching, contact Powell Litigation as soon as possible for advice based on your particular circumstances.
Frequently Asked Questions About Ontario Limitation Periods
Is the limitation period always two years in Ontario?
No. Two years is the basic limitation period for many civil claims, but different statutes, exceptions, notice requirements, and factual circumstances may result in a different deadline.
Does sending a demand letter stop the limitation period?
Generally, sending a demand letter does not by itself stop the limitation period. A claimant may still need to commence a court proceeding before the applicable deadline.
Do settlement negotiations extend the deadline to sue?
They do not automatically extend it. Parties should not assume that negotiations, mediation, or promises to resolve the dispute have paused the limitation period.
What does “discovered” mean under the Limitations Act, 2002?
A claim is generally discovered when the claimant knew, or reasonably should have known, that a loss occurred, that it was caused by the proposed defendant, and that a court proceeding would be an appropriate way to pursue a remedy.
Can I still sue if more than two years have passed?
Possibly, but it depends on when the claim was legally discovered and whether an exception, acknowledgment, suspension, or different statutory period applies. A lawyer should review the facts promptly.
Does the 15-year ultimate limitation period apply to every claim?
No. The Limitations Act, 2002 includes exceptions, and some claims are governed by other legislation or are excluded from the standard framework.
Legal Disclaimer
This article is provided for general informational purposes only and does not constitute legal advice. Reading this content does not create a solicitor-client relationship with Powell Litigation.
Ontario limitation periods can be complex, and the applicable deadline depends on the specific facts, the type of claim, and the laws that apply to your situation. If you have questions about a potential claim or are concerned about a filing deadline, you should consult an experienced Ontario civil litigation lawyer for legal advice tailored to your circumstances.