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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Work & Employment Rights Ontario » Wrongful Dismissal & Severance Ontario » Ambiguous Termination Clauses Interpreted Against the Employer (Contra Proferentem) in Ontario

Ambiguous Termination Clauses Interpreted Against the Employer (Contra Proferentem) in Ontario

10 Jun 2026 3 min read No comments Wrongful Dismissal & Severance Ontario
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In Ontario, if an employment contract’s termination clause is vague, confusing, or potentially violates the Employment Standards Act (ESA), judges apply the “contra proferentem” rule. This means the ambiguity is interpreted strictly against the employer who drafted it, generally invalidating the clause and entitling the employee to full common law severance pay.

Employment contracts are often packed with dense legal jargon that is extremely difficult for the average person to understand. 📄 Employers frequently use confusing language to try and limit your severance pay to the bare minimums required by law. However, Canadian employment law recognizes the power imbalance between a massive corporation and a single employee.

Because the employer writes the contract, they bear the strict responsibility of making it clear and legally compliant. If they fail to do so, Ontario courts apply a legal doctrine known as contra proferentem. Simply put, any tie or confusion goes to the employee, which can completely void the employer’s attempt to cap your severance.

Step-by-Step Process in Ontario

Whether you work in a corporate office in Toronto, a tech firm in Ottawa, or a manufacturing plant in Mississauga, you should never blindly accept that your employment contract is “ironclad.” 📈 Follow these steps to challenge an ambiguous termination clause.

Step 1: Do Not Take HR’s Word for It

When you are fired, human resources will likely point to the termination clause in your contract and insist they only owe you a few weeks of pay. Do not sign their release forms. Employers often bluff, hoping you will not realize that their poorly drafted contract would instantly fail in front of an Ontario judge.

Step 2: Have a Lawyer Search for ESA Violations

The smallest typo or grammatical error can render a termination clause ambiguous. 🔍 Furthermore, if the clause even hypothetically violates the Employment Standards Act (ESA)-such as failing to mention the continuation of your benefits during the notice period-the entire clause becomes void. An experienced employment lawyer knows exactly what fatal flaws to look for.

Step 3: Sue for Common Law Severance at the Superior Court

If the termination clause is found to be ambiguous or illegal, it is completely struck down. Your lawyer can then file a Statement of Claim at the Superior Court of Justice, demanding your full common law reasonable notice. Depending on your age and tenure, this can turn a measly 4-week offer into a 12 to 24-month severance package.

How Much Does It Cost in Ontario?

Challenging a corporate employment contract does not mean you have to drain your savings account.

Cost FactorEstimated Cost (CAD)
Contract Review ConsultationA standard flat fee for an employment lawyer to review your contract and spot ambiguities usually ranges from $350 to $750 CAD.
Superior Court Filing FeeIssuing a formal lawsuit against your employer at an Ontario courthouse currently costs approximately $339 CAD.
Contingency FeesIf your lawyer takes your wrongful dismissal case on contingency, they will typically retain 25% to 35% of the final settlement.

How Long Does the Process Take?

Employers generally know when their contracts are legally defective. 🕐 A strongly worded demand letter pointing out the contra proferentem issues can often force an employer to settle fairly within 2 to 4 months. If the employer stubbornly defends their flawed contract, litigating the matter through the Superior Court of Justice can take 1.5 to 2.5 years before reaching a summary judgment or trial.

Frequently Asked Questions (FAQ)

What exactly does contra proferentem mean?

It is a Latin legal term meaning “against the offeror.” In Ontario employment law, it means that if a contract term has more than one reasonable interpretation, the court will adopt the interpretation that most benefits the employee who did not draft the document.

Does it apply if I signed the contract years ago?

Yes. It does not matter if you signed the contract 10 years ago. If the termination language was ambiguous or violated the ESA at the time it was signed, it remains legally unenforceable today.

What if the clause is only slightly confusing?

Ontario judges hold employers to an incredibly high standard. If the wording requires mental gymnastics to understand, or fails to clearly differentiate between termination with cause and without cause, the courts will generally strike it down entirely.

Do I have to go to a full trial to win?

Usually no. Because contract interpretation is a matter of law, your lawyer can often resolve the case through a faster process called a ‘Summary Judgment,’ which avoids a lengthy, full-blown public trial.

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