Wrongful Dismissal in Ontario: What Employees Should Know

Losing your job is disorienting enough without having to navigate a maze of legal rules about what your employer actually owes you. Wrongful dismissal in Ontario is one of the most misunderstood areas of employment law — and the stakes are real. The gap between what some employers offer and what employees are actually entitled to can amount to months of salary.

This guide explains the key concepts: the difference between minimum statutory entitlements and common-law reasonable notice, what "just cause" really means, how constructive dismissal works, and what you must do to protect your own claim.

Two Separate Systems: The ESA and the Common Law

Ontario employees are protected by two overlapping frameworks, and understanding the difference is essential.

The Employment Standards Act, 2000 (ESA)

The Employment Standards Act, 2000 (ESA) sets out minimum entitlements on termination. These are the floor, not the ceiling. Key ESA provisions on termination include:

• Notice of termination (or pay in lieu) — calculated based on length of service, up to a maximum of eight weeks for employees with eight or more years of service (as of writing — verify current maximums with a lawyer, as the ESA is subject to amendment).
• Severance pay — a separate entitlement for employees with five or more years of service who work for an employer with a payroll of $2.5 million or more, or whose employment is terminated as part of a mass layoff. Severance pay is calculated at one week per year of service, up to a maximum of 26 weeks.
• Continuation of benefits — in some cases, the employer must continue benefits during the statutory notice period.

ESA minimums are relatively modest. Many employees are surprised to learn how little their statutory entitlement actually is — especially in the first few years of employment.

Common-Law Reasonable Notice

Beyond the ESA, most employees in Ontario are also entitled to reasonable notice of dismissal (or pay in lieu of notice) at common law. This is the more significant entitlement for most employees.

"Reasonable notice" is a judge-made concept. Courts ask: how long would it take a reasonable person in this employee's position to find comparable new employment? The answer depends on factors including:

• Age — older workers generally receive longer notice periods because it is harder for them to find equivalent work.
• Length of service — longer tenure generally means longer notice.
• Character of employment — more senior, specialized, or managerial roles attract longer notice periods.
• Availability of similar employment — a niche skill set in a contracting industry justifies longer notice.

Common-law reasonable notice can range from a few weeks to 24 months or more in some circumstances. There is no hard cap comparable to the ESA maximum. For a long-tenured, senior employee, the difference between ESA minimums and common-law entitlement can be enormous.

"Just Cause": A High Bar

Employers sometimes tell dismissed employees they were let go "for cause" — implying serious misconduct that justifies dismissal without any notice or pay. This is often wrong.

Just cause at common law requires serious misconduct that fundamentally breaches the employment relationship. Courts have found just cause in cases of serious dishonesty, violence, and repeated insubordination after warnings. They have not found just cause in many of the situations where employers claim it: a single mistake, performance issues without proper warnings, or disagreements about business direction.

If an employer claims just cause and cannot prove it, the dismissal becomes a wrongful dismissal — and the employer owes the full notice entitlement. Employers who raise unfounded just-cause allegations can also face additional damages.

Note: Ontario's ESA uses the phrase "wilful misconduct" for the equivalent concept of dismissal without statutory entitlements. The threshold under the ESA is different from common-law just cause and is also relatively high.

Constructive Dismissal

Not every wrongful dismissal involves being told your job is over. Constructive dismissal occurs when your employer makes a fundamental, unilateral change to a core term of your employment — and the change is so significant that it amounts to the employer repudiating the contract of employment.

Common examples include:

• a substantial cut to base salary
• a demotion or significant reduction in duties
• forced relocation to a different city
• a hostile work environment created or allowed to persist by the employer
• a unilateral change to commission structure that dramatically reduces earnings

If you are constructively dismissed, you have essentially been dismissed without notice — you can resign and claim the same notice entitlement you would receive in a termination. But you must act promptly: if you continue to work under the changed conditions for too long without objecting, you may be found to have accepted the new terms.

Constructive dismissal claims are highly fact-specific, and the decision to resign should not be made without legal advice.

Your Duty to Mitigate

A critical — and often overlooked — aspect of wrongful dismissal claims is the duty to mitigate. Once dismissed, you are legally required to take reasonable steps to find comparable new employment. You cannot simply collect damages without making efforts to replace your income.

What this means in practice:

• You should actively search for comparable work.
• You should document your job search efforts.
• If you find a new job, earnings from that job are typically deducted from your damages (except for ESA minimums in some circumstances).

A dismissed employee who refuses a reasonable job offer from the same employer (where the relationship has not been poisoned) may also lose part of their claim.

Wrongful Dismissal vs. "Unjust Dismissal"

These terms are often confused. In Ontario:

• Wrongful dismissal is a common-law claim for failing to provide adequate notice.
• Unjust dismissal is a federal concept under the Canada Labour Code, applying to non-management, non-unionized employees of federally regulated employers (banks, railways, airlines, telecommunications companies). It is a different remedy with different rules.

If your employer is provincially regulated (the vast majority of Ontario employers), your claim is wrongful dismissal under Ontario law — not unjust dismissal.

Severance Packages and Releases

Many employers present a dismissed employee with a severance package and ask them to sign a full and final release — a document releasing the employer from all further claims. Before signing any release:

• You have time. There is no legal obligation to sign immediately, and a reputable employer will not demand that.
• Get legal advice first. Once signed, a release is very difficult to set aside.
• The package may be negotiable. Many initial severance offers are below what a court would award — especially for senior or long-serving employees.

Frequently asked questions