The Mitigation ‘Brake-Down’

Why It Matters

The clarification eliminates uncertainty for employers and litigants about how mitigation earnings affect wrongful‑dismissal damages, shaping settlement and defense approaches across Ontario’s employment landscape.

Key Takeaways

• All earnings during notice period offset damages, even inferior jobs
• Concurring opinions do not create binding law in Ontario employment cases
• Employer saved $32,881 (~$24k USD) yet incurred $15,000 (~$11k USD) costs
• Aggressive mitigation defenses may cost more than potential damages savings
• Proactive outplacement and job referrals lower litigation risk and expense

Pulse Analysis

The duty to mitigate is a cornerstone of Canadian employment law, obligating dismissed workers to seek comparable employment and offsetting their notice damages with any earnings. Yet a lingering ambiguity from the Brake decision—where a concurring opinion suggested that income from a lower‑paying job should not be deducted—left practitioners uncertain about the proper calculation of notice awards. This gray area often forced HR teams and counsel to hedge their advice, balancing legal risk against the practicalities of a job search during a notice period.

The recent Williamson ruling cuts through that uncertainty by reaffirming that all income earned during the notice period, regardless of job quality, must be deducted from the award. The court’s order to subtract $32,881 CAD (approximately $24,000 USD) from the employee’s damages underscores the strict application of the mitigation principle, while still imposing a $15,000 CAD (about $11,000 USD) costs award on the employer for other appeal failures. The decision illustrates a classic cost‑benefit dilemma: even when an employer successfully reduces a damages figure, the ancillary costs of litigation can erode any financial gain.

For employers, the practical takeaway is clear—investing in proactive mitigation strategies often outweighs the expense of courtroom battles. Offering outplacement services, actively sharing internal vacancies, or even rehiring dismissed staff can demonstrate good‑faith efforts and potentially limit exposure to mitigation defenses. Coupled with early legal counsel, such measures help manage litigation risk, preserve corporate reputation, and keep overall costs in check, reinforcing a more strategic approach to wrongful‑dismissal disputes.