How Does a Wrongful Dismissal Claim Work in Ontario, and How Long Does It Take?

Step 1: Confirm you were dismissed, including by constructive dismissal

A wrongful dismissal claim in Ontario is a common-law lawsuit for breach of the employer’s implied obligation to give reasonable notice of termination, or pay in lieu of that notice. It is not automatically triggered by every termination; it arises when an employer ends the employment relationship (or effectively forces the employee out) without providing the notice, or pay in lieu, that the law requires.

Dismissal does not have to be an explicit firing. Under Ontario’s Employment Standards Act, 2000, an unannounced but fundamental change to a term of employment, such as a significant pay cut, demotion, or unilateral relocation, can amount to a “constructive dismissal” if it breaches a fundamental term of the contract and the employee resigns within a reasonable time afterward. That resignation is then treated as a termination for the purposes of a wrongful dismissal claim.

Step 2: Choose your route: an ESA claim or a civil lawsuit, not both

Before taking any formal step, an employee needs to decide between two mutually exclusive paths. The Employment Standards Act, 2000 requires an employee to elect either an administrative ESA claim (filed with the Ministry of Labour for statutory termination or severance pay) or a civil wrongful dismissal lawsuit for the same termination. Choosing one forecloses the other.

An ESA claim investigation can take several months once filed; the Ministry typically assigns the file to an early resolution officer for initial review. A civil lawsuit takes longer to conclude but can recover common-law reasonable notice, which is calculated individually and is not capped the way ESA statutory notice is.

Step 3: Know the limitation period before doing anything else

Once the election is made in favour of a lawsuit, the clock matters. The basic limitation period under the Limitations Act, 2002 is two years from the day the claim was discovered, not necessarily the day of dismissal itself. There is also an ultimate limitation period of 15 years from the date of the act or omission (the dismissal), which applies regardless of when the claim was discovered and acts as an absolute outer cap.

Step 4: Pick the court track if litigating

If a lawsuit is the chosen route, Ontario’s civil courts sort cases by dollar value:

The right track depends on how the reasonable-notice period and any other damages are estimated to add up.

Step 5: Move through the litigation stages

A Superior Court wrongful dismissal action generally proceeds through nine stages: the plaintiff issues a claim; the defendant files a defence; pleadings close; the parties conduct discovery; mandatory mediation and settlement discussion occurs; the action is set down for trial; a pre-trial conference is held; motions may be brought; and finally, trial. Each stage adds time, and the overall length of a case depends heavily on how many of these stages are actually reached before a settlement.

Mediation is a mandatory checkpoint in some Ontario regions. In Toronto, Ottawa, and Windsor, it must take place within 180 days after the first statement of defence is filed, unless the parties agree to a different schedule. This makes mediation one of the earliest points at which many cases resolve, well before the later stages of discovery, pre-trial, or trial are reached.

Step 6: Understand mitigation and how it affects damages

Throughout the notice period, an employee is expected to take reasonable steps to find comparable employment. Ontario courts can reduce a wrongful dismissal damages award for failure to mitigate. In one Ontario Court of Appeal decision, an award equivalent to six months’ reasonable notice was reduced by two months for a failure to mitigate, illustrating how directly this can affect the final amount recovered, separate from how long the case itself took to resolve.

Step 7: Know the outer time limits on the case itself

Even once a lawsuit is underway, Ontario’s civil rules impose their own backstop. If the action is not set down for trial within five years of being started, it is automatically dismissed for delay. This five-year rule is the absolute outer boundary for how long a case can sit active in the system, regardless of how the earlier stages unfolded.

What determines how long it actually takes

No primary source sets a single “typical” duration for an Ontario wrongful dismissal claim; the timeline is a function of the variables above. Whether the case settles at the demand-letter stage, at mandatory mediation, or proceeds through the full nine stages to trial; which court track applies; and how quickly discovery and pre-trial conferences are scheduled will all determine whether a case wraps up in months or stretches toward the five-year automatic-dismissal limit.