Constructive Dismissal in Ontario: How Employers Inadvertently Create Claims

Constructive dismissal in Ontario is one of the most expensive mistakes an employer can make, and most of the time it happens without any intent to terminate anyone. The employer changes a shift schedule, cuts hours to manage costs, pulls someone off a project, or ignores a team’s complaints about a difficult manager. The employee resigns. Then comes the lawsuit. Ontario law treats that resignation as a termination if the employer made an unauthorized change to a fundamental term of employment, or allowed conditions to become so intolerable that any reasonable person would have left. The business thought it was making an operational decision. A court may see it as a firing.

What Constructive Dismissal Actually Means Under Ontario Law

Under both the Employment Standards Act, 2000 (ESA) and Ontario common law, a constructive dismissal occurs when an employer unilaterally makes a significant change to a fundamental term of employment, or creates a workplace so hostile or unsafe that continued employment is not a reasonable option. The employee does not have to accept the change. If they resign in response to it within a reasonable period, the law treats the departure as a termination and the employer is on the hook for notice and potentially damages.

The key word is unilateral. If the employee agreed to the change, in writing, freely and with full understanding, there is no constructive dismissal. If the change was already permitted by a clear, enforceable clause in the employment contract, there is no constructive dismissal. But if neither condition applies, the employer’s motivation, good or bad, does not matter. Courts look at whether a reasonable employee in that position would have viewed the change as a fundamental breach of the employment relationship.

The ESA allows an employee to treat a constructive dismissal as a termination and file a claim. At common law, the damages exposure is broader: wrongful dismissal damages based on reasonable notice, and in cases of particularly abusive conduct, aggravated or punitive damages on top of that.

The Changes That Create Constructive Dismissal Claims in Ontario

Any of the following, done without consent or without a clear contractual right to do so, can give rise to a constructive dismissal claim:

• Pay cuts or commission structure changes. Even a reduction that the employer considers modest can be substantial enough. There is no fixed percentage threshold. Courts look at the overall impact on the employee.
• Reduction in hours. Cutting someone from full-time to part-time without agreement is a textbook example. So is eliminating overtime that has become a consistent part of compensation.
• Demotion or title change. Removing authority, stripping a direct reporting structure, or reassigning someone to a role with materially less responsibility affects status and can support a claim even when salary stays the same.
• Significant changes to duties. Taking a marketing director and reassigning them to purely administrative work, or removing all managerial responsibilities from a manager, crosses the line in most cases.
• Forced relocation. Moving someone to a different city or to a location that significantly increases commute time can be constructive dismissal if the contract does not expressly permit it.
• Return-to-office mandates for remote employees. If an employee was hired with remote work as a condition of employment, or if remote work became an established term through practice, forcing full-time office attendance without a contractual right to do so is a risk. Courts have begun examining these situations closely.
• Unauthorized temporary layoff.Ontario’s ESA allows temporary layoffs in limited circumstances. The employment contract must permit it. If it does not, a layoff can be treated as termination at common law regardless of what the ESA says.

When the Workplace Itself Becomes the Problem

Constructive dismissal does not always come from a formal employment decision. It can arise from a workplace that the employer allowed to become intolerable. Ontario employers have duties under multiple statutes, and failing those duties can feed directly into a constructive dismissal claim.

The Occupational Health and Safety Act(OHSA) requires employers to maintain a workplace free from harassment and violence. An employer who ignores credible complaints about a bullying supervisor, allows a toxic team dynamic to continue unchecked, or fails to take workplace harassment seriously is not only at risk of a Ministry of Labour order. That same inaction can form the basis of a “hostile workplace” constructive dismissal claim if an employee eventually resigns because they could not take it anymore.

The Ontario Human Rights Code (OHRC) adds another layer. If the intolerable conditions are connected to a protected ground, whether that is disability, family status, age, gender, race, or any other protected characteristic, the employer faces both a human rights complaint and a constructive dismissal claim. Failing to accommodate an employee with a disability to the point of undue hardship, then making their continued employment difficult enough that they leave, is a scenario that triggers both regimes simultaneously.

The Most Common Employer Mistakes That Trigger Claims

Most constructive dismissal claims in Ontario are not the result of deliberate bad faith. They come from one of the following:

Relying on a verbal agreement or informal nod.An employee who said “okay, fine” in a meeting is not a consenting employee. Consent to a change in a fundamental term needs to be documented. A signed acknowledgment of the change protects both parties.

Using an outdated or poorly drafted contract. If the employment contract has no flexibility clause for location, duties, or schedule, the employer has no contractual authority to make those changes. Courts do not fill in gaps in favour of employers on fundamental terms.

Laying off an employee without a layoff clause in the contract. The ESA permits temporary layoffs within defined limits, but the common law does not recognize the right to lay off unless the contract explicitly provides for it. An employer who lays off without that clause may have constructively dismissed the employee on day one of the layoff.

Using performance management as a pressure campaign to force a resignation. Piling on unwarranted criticism, imposing impossible performance targets, or creating an environment designed to make someone quit rather than terminating them properly can result in not only a constructive dismissal claim but elevated damages for bad faith conduct in the manner of dismissal.

Ignoring escalating harassment complaints. Every week a known harassment situation goes unaddressed is a week of additional exposure. An OHSA-compliant investigation and response process is not optional. It is also the employer’s primary defense if a hostile workplace claim later surfaces.

Practical Steps Ontario Employers Should Take Before Making Changes

Before any employer changes compensation, hours, duties, location, or reporting structure for an existing employee, the following steps reduce constructive dismissal risk significantly:

Review the employment contract first. Does it give the employer the right to make this change? If yes, that clause needs to be clearly worded and enforceable. If no, the employer needs to treat the change as a proposed amendment and obtain genuine consent.

Obtain documented consent. Put the proposed change in writing. Give the employee time to review it. If they agree, get a signed acknowledgment. Consider whether independent legal advice is appropriate for significant changes. A consent document is worth more than any verbal reassurance.

Provide proper notice where consent is not available. If the employee will not agree to a change, the employer’s only clean option is to provide advance notice of the change, long enough to satisfy common law reasonable notice obligations. This effectively ends the old contract and offers new terms. It is not risk-free, but it is far cleaner than a unilateral imposition.

Document your OHSA compliance. If there are harassment or workplace conflict issues in play, investigate them properly, document the process, and follow your workplace harassment policy. An employer who has a documented, good-faith investigation is in a much stronger position than one who ignored the complaints.

Run an accommodation analysis before making changes that affect protected groups. If the change disproportionately affects an employee who has a disability, is pregnant, or has family status obligations under the OHRC, consult before acting. Get the accommodation process right before implementing the operational decision.

What It Costs When Employers Get This Wrong

The financial exposure from a constructive dismissal claim in Ontario is identical to a wrongful dismissal claim: reasonable notice damages calculated on the employee’s age, length of service, character of the position, and availability of comparable employment. For a long-service, senior employee, that can mean twelve to twenty-four months of compensation or more.

If the employer’s conduct was particularly bad, courts may award aggravated damages for the manner of dismissal or punitive damages in exceptional cases. Using a performance improvement process as a pretext to pressure a resignation, or retaliating against an employee for exercising OHSA or OHRC rights, are the kinds of conduct that can move a claim from expensive to very expensive.

There are also ESA consequences. A constructive dismissal under the ESA triggers entitlements to termination pay and, where applicable, severance pay. These are minimum floors, not ceilings. A common law claim sits on top of them.

Beyond the dollar amount, constructive dismissal claims are time-consuming. They generate legal costs, management distraction, potential Ministry of Labour involvement, and, if there is a human rights component, a separate Human Rights Tribunal proceeding. The reputational dimension matters too, particularly for smaller organizations where employment disputes travel quickly in a sector.

When to Get HR and Legal Advice Before You Act

If you are considering any of the following, get advice before you act, not after the employee has resigned and a demand letter has arrived:

• Any reduction in pay, base salary, commissions, bonuses, or total hours for an existing employee.
• A role change, demotion, reassignment, or material shift in duties or authority.
• A change in reporting structure that diminishes an employee’s position.
• A temporary layoff, especially where the employment contract does not expressly permit it.
• A mandatory return-to-office policy that will affect employees who were hired or have worked remotely for an extended period.
• A forced relocation or significant change in work location.
• Any situation where a resignation seems likely and you are not sure whether it would constitute a constructive dismissal.

Constructive dismissal cases are almost always preventable. The employer who reviews the contract, documents consent, provides proper notice, and takes workplace complaints seriously rarely ends up in litigation over a constructive dismissal. The employer who moves fast, assumes the employee will accept it, and cleans up later is the one funding someone’s legal fees.