Contra Proferentem — Ontario Employment Law
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About Contra Proferentem
If you have ever read through an employment contract, bonus policy, or equity plan and thought, "This language could mean two completely different things," you have encountered the core issue addressed by the legal doctrine of contra proferentem. In Ontario employment law, contra proferentem—which translates from Latin as "against the offeror"—is an important common law principle of contract interpretation. It dictates that if a term in a contract is genuinely ambiguous, the court will interpret that term against the party who drafted the contract.
In the context of the workplace, this rule acts as a critical shield for workers. Because employment relationships are typically characterized by an imbalance of bargaining power, it is usually the employer who drafts the employment agreement, standard form contracts, commission plans, and severance releases. Employees are often expected to simply sign on the dotted line. If an employer uses vague, confusing, or contradictory language regarding your rights—such as whether restricted share units (RSUs) vest during a severance period, or how a bonus is calculated upon resignation—they generally cannot weaponize their own poor drafting to deny you your entitlements.
However, it is important to understand how Ontario courts apply this doctrine. A judge will not use contra proferentem just because an employee suggests a strained or highly unlikely interpretation of a clause. The court will first try to determine the plain and ordinary meaning of the words used, looking at the entire contract (the "factual matrix"). It is only when there is a true, irresolvable ambiguity—meaning the wording could reasonably support more than one interpretation—that contra proferentem tips the scales in the employee's favour.
This doctrine frequently arises in complex compensation disputes, such as conflicting definitions of "change of control" versus "termination without cause" in stock option plans, or poorly defined formulas for performance bonuses. It is also often used when interpreting overly broad or contradictory termination clauses. Because navigating contractual ambiguities requires a deep understanding of legal precedents and how courts read specific phrases, uncovering whether a clause legally works in your favour involves precise legal analysis rather than a quick glance. Anyone struggling with a confusing contract should have it examined by a professional who can decode the language.
Frequently Asked Questions
What exactly does contra proferentem mean in plain English?
Contra proferentem is a legal rule meaning that if a contract's wording is vague or has multiple reasonable meanings, the confusion is resolved against the person or company that wrote the document. For employees, this usually means an ambiguous contract is interpreted in their favour, since the employer drafted it.
Does this rule apply automatically to every Ontario employment contract?
No. The rule only applies if there is a genuine ambiguity in the contract. If the language is harsh but legally clear and compliant with the Employment Standards Act (ESA), a court will enforce the plain meaning of the words, regardless of who drafted it.
Can my employer avoid this by adding a clause saying contra proferentem doesn't apply?
Employers sometimes include language in a contract stating that both parties had equal input and the contra proferentem rule shall not apply. However, Ontario courts frequently look past these clauses if it is obvious that it was a standard-form contract that the employee had no real power to negotiate.
How can this doctrine help me with unpaid bonuses or commissions?
If a bonus or commission policy has contradictory rules about what happens to your payouts if you resign or are terminated, a court may use contra proferentem to interpret the policy in the way that allows you to collect the compensation you earned.
Does this apply to severance releases or settlement agreements?
Yes. If an employer has you sign a release to get your severance pay, but the release is drafted with confusing language about what exact legal claims you are giving up, courts can interpret that ambiguity strictly against the employer.
At what point should I get a lawyer to look at an ambiguous contract?
You should seek professional legal review the moment your employer denies you compensation, equity, or severance based on a contract clause that seems contradictory or unclear, as you may have a strong case under the contra proferentem rule.
Common Scenarios
- A technology executive is terminated, and her employment contract contains a stock option plan with conflicting sentences regarding whether her restricted share units (RSUs) continue to vest during her common law notice period.
- A sales representative resigns and asks for commissions on deals she closed before leaving, but the employer refuses, pointing to an unstructured, vague internal policy that lacks a clear formula for post-resignation payouts.
- A warehouse supervisor signs a severance release upon termination, but later discovers he is owed thousands in unpaid overtime; the employer claims the release blocks the lawsuit, but the release's wording regarding prior statutory wages is highly ambiguous.
- A director's employment agreement has a termination clause stating she will receive only ESA minimums, but a later paragraph in the same contract guarantees full benefits continuation for a much longer period, creating a direct contradiction.
What You Should Know
- Never automatically assume your employer's interpretation of a confusing company policy or employment contract is the legally binding one.
- Keep copies of all supplementary documents, such as employee handbooks, commission matrices, and stock option plans, as courts use these to determine if an ambiguity exists across your employment terms.
- Before signing an employment contract, read it carefully to spot contradictory paragraphs; while contra proferentem might save you later, clarifying ambiguities upfront is always safer.
- If your employer relies on a highly confusing clause to deny your rights or pay, consult an Ontario employment lawyer to analyze the specific wording and apply current contractual interpretation precedents.
Featured Cases
M. v. Salesfloor Inc.
2025 ONSC 3739 (CanLII) · 2025-06-24Unpaid Commissions: Resignation & Policy Incorporation
This case concerns a dispute over unpaid commissions owed to a former employee after her resignation. The court determined that the 2020 Commission Policy governed the plaintiff's entitlements because she did not consent to the 2021 policy changes. Applying the principle of contra proferentem to resolve ambiguities in the disbursement clause, the court found the plaintiff was the effective cause of the deals and entitled to the commissions earned before her resignation.
Movati Athletic (Group) Inc. v. B.
2018 ONSC 7258 (CanLII) · 2018-12-06Termination Clause Ambiguity: Contra Proferentem Applied
This is an appeal from a motion judge's decision regarding the enforceability of a termination clause in an employment contract. The Divisional Court addressed whether the clause clearly and unambiguously displaced the common law presumption of reasonable notice and whether the motion judge correctly applied the contra proferentem principle to resolve ambiguities in favour of the employee.
B. v. Movati Athletic (Group) Inc.
2018 ONSC 885 (CanLII) · 2018-02-06Wrongful Dismissal: Termination Clause Ambiguity
This wrongful dismissal case addressed whether a termination clause in the employment agreement was sufficiently clear to displace common law reasonable notice rights. The court applied the principle of contra proferentem against the employer and granted summary judgment in favor of the plaintiff, calculating damages based on the Bardal factors including the employee's managerial role, age, and length of service.
N. v Second Cup
2017 ONSC 6315 (CanLII) · 2017-10-20Wrongful Dismissal: 4 Months Notice for 8.5-Month Employee
This wrongful dismissal case concerned a manager with 8 ½ months of employment who was terminated without cause. The court found the termination clause ambiguous and interpreted it contra proferentem, ruling it did not displace the common law right to reasonable notice. Consequently, the plaintiff was awarded 4 months' pay in lieu of notice and one month of pension contributions.
M. v. John Bear Pontiac Buick Cadillac Ltd.
2010 ONSC 6231 (CanLII) · 2010-11-15Employment Contract: Pay Plan Interpretation and Commission Dispute
This case concerns a dispute over the interpretation of Pay Plan contracts and alleged underpayment of commissions. The court addressed whether to interpret the contracts based on literal wording or the factual matrix, including industry custom, and whether the contra proferentem rule applied. The plaintiff failed to establish underpayment or ambiguity in the contracts.
D. v. Hudson's Bay Comp
2007 ONCA 399 (CanLII) · 2007-05-28Employment Contract Interpretation: Contra Proferentem
This is an employer's appeal to the Court of Appeal from an application judge's decision concerning an employee's mid-term incentive plan. The employee, G.D., sought his full entitlement under the plan following a change of control at the Hudson's Bay Company. The application judge ruled that the employee was entitled to the full vesting of his share units, rather than an amount pro-rated to his active employment. The Court of Appeal agreed and upheld the decision, finding that the change of control triggered actual and immediate vesting of the share units under the governing clause. The employer's appeal was dismissed, leaving the employee with his full entitlement under the incentive plan.
D. v. Hudson's Bay Company
2006 CanLII 31299 (ON SC) · 2006-09-11Severance Entitlements: Employee Entitled to Full RSU Payout Under Change of Control Provision
A severance entitlements case involving the interpretation of a 'change of control' provision in an employee stock option plan. The court held that the provision is clear, mandatory, and unconditional, and that it overrides the 'termination without cause' provision, entitling the employee to a full payout of restricted share units (RSUs) vested during the severance period.
T. v. Canada Life Assurance Company
2006 CanLII 53345 (ON CA) · 2006-01-27Wrongful Dismissal: Damages for Lost Pension Benefits
This is an appeal concerning damages for wrongful dismissal, specifically addressing whether an employee is entitled to compensation for pension benefits that would have accrued during the reasonable notice period. The Court of Appeal for Ontario upheld the common law right to such damages, ruling that ambiguous language in pension plan terms must be strictly construed against the employer and does not exclude these damages.
A. v. Ottawa community housing Corp.
2003 CanLII 23361 (ON SC) · 2003-06-02Severance Pay Dispute: Interpretation of Contractual Provisions
A dispute over the calculation of severance pay under an employment contract, focusing on whether the applicant is entitled to 18 months or 25 months of pay under article 4.1.7. The court determined that the plain meaning of the contract prevails and that benefits and allowances are excluded from the 'regular rate of pay' as defined in the contract.
Abundance Marketing Inc. v. Integrity Marketing Inc.
2002 CanLII 23605 (ON SC) · 2002-09-04Wrongful Dismissal: Release Interpretation and Counterclaim
A wrongful dismissal case where the defendant counterclaimed after signing a release for unpaid commissions. The court examined whether the release barred the counterclaim, applying the doctrine of contra proferentem and emphasizing the need to interpret the release in light of the factual matrix. The motion for summary judgment to dismiss the counterclaim was denied due to conflicting evidence regarding the scope of the release.
C. v. Family Counselling Centre of Sault Ste. Marie and District
2001 CanLII 4698 (ON CA) · 2001-11-16Wrongful Dismissal: 8 Months Notice Awarded
This is an appeal from the Divisional Court's decision in a wrongful dismissal action. The Court of Appeal restored the trial judge's award of eight months' notice, finding that the employer's termination provisions in a policy manual were ambiguous and did not rebut the common-law presumption of reasonable notice.
M. v. Image Processing Systems Inc.
1999 CanLII 14859 (ON SC) · 1999-08-11Employment Contract Dispute: Bonuses and Commissions Awarded Despite Post-Resignation Payment
A breach of contract case involving unpaid bonuses and commissions under an employment contract. The plaintiff claimed entitlement to commissions earned during employment, even after resignation, while the defendant argued that the lack of a defined formula for bonuses constituted an agreement to agree. The court held that the defendant’s failure to establish a formula constituted a breach of contract and that commissions earned during employment must be paid, absent an explicit policy to the contrary. The court also accepted the plaintiff’s argument that the defendant waived its right to recover an outstanding balance.
C. v. Westinghouse Canada Inc.
1994 CanLII 7520 (ON SC) · 1994-12-09Termination and Pension Benefits: Employee Denied Bridge Benefit After Age 56 Termination
A termination case involving a plaintiff who was denied bridge benefits under a pension plan after being terminated at age 56 during an economic downturn. The court examined whether the termination equated to a company-requested early retirement and whether the employer acted in good faith during workforce reductions.
W. v. Scotia Investments Ltd.
1994 CanLII 10533 (ON SC) · 1994-11-07Employment Contract Dispute: Pension Entitlements After Wrongful Termination
A merits decision involving an employment contract dispute where an employer terminated an employee without cause and denied pension benefits. The court rejected the employer's interpretation of the contract, applied the contra proferentem rule in favor of the employee, and held the employer liable for pension obligations.
K. v. CNA Assurance Co.
1978 CanLII 2194 (ON SC) · 1978-06-28Employee Status Determination: Dental Anaesthetist and Insurance Coverage
A case determining whether a dental anaesthetist qualifies as an 'employee' under a liability insurance policy, with the court analyzing factors such as control over when and where work is performed. The plaintiff was classified as an employee rather than an independent contractor.
C. v. J. et al.
1972 CanLII 439 (ON CA) · 1972-02-02Employment Contract: Interpreting Gross Billings Bonus
This is a merits decision by the Court of Appeal for Ontario regarding the interpretation of an employment contract clause concerning bonus calculations based on 'gross billings'. The court applied the contra proferentem rule to resolve ambiguity in the contractual terms, ruling in favour of the employee and rejecting the employer's attempt to limit the definition of gross billings to services personally performed.