After-Acquired Cause: Your Employer Finds Misconduct AFTER Firing You

The Doctrine That Lets Employers Rewrite History

Picture this: you get fired without cause. Your employer hands you a severance package. Then, while cleaning out your files or auditing your work, they discover something — falsified credentials, a competing side business, theft of company property. Suddenly, they want that severance back. They claim they would have fired you for cause had they known. This is the after-acquired cause doctrine, and it is one of the most tactically aggressive moves in Canadian employment law.

The concept is straightforward. An employer terminates an employee without cause, then later discovers misconduct that, had it been known at the time, would have justified a for-cause dismissal. The employer then attempts to retroactively convert the without-cause termination into a for-cause one, eliminating or reducing the employee's entitlement to notice, severance, or damages.

But Canadian courts have drawn sharp lines around when this actually works — and it works far less often than employers would like.

The Legal Framework: What Employers Must Prove

The leading framework for after-acquired cause in Ontario was shaped by cases including Dowling v. Ontario (Workplace Safety and Insurance Board), 2004 CanLII 34553 (ON SCDC), and further refined by the Ontario Court of Appeal in cases like Aasgaard v. Harlequin Enterprises Ltd., 1997 CanLII 1262 (ON CA).

For an employer to successfully invoke after-acquired cause, they must demonstrate:

1. **Genuine ignorance:** They were not aware of the misconduct at the time of the without-cause dismissal, and they were not willfully blind to it.

2. **No condonation:** They did not condone the misconduct, either expressly or implicitly. If they knew and looked the other way, the doctrine is unavailable.

3. **Proportionality:** The misconduct must be serious enough that it would have independently justified a for-cause dismissal under the *McKinley v. BC Tel*, 2001 SCC 38, proportionality framework.

That last point is critical. The Supreme Court of Canada's decision in McKinley established that just cause is not determined by the category of misconduct alone. Instead, courts apply a contextual, proportionality-based analysis. The misconduct must be weighed against the totality of the employment relationship — including the employee's length of service, their role, whether the misconduct was isolated or a pattern, and whether it irreparably damaged the trust relationship.

The Proportionality Requirement: Where Employers Get Tripped Up

This is where after-acquired cause claims most frequently collapse. An employer might discover that an employee exaggerated a credential on their resume fifteen years ago. Dishonest? Yes. Grounds for retroactive termination with cause? Almost certainly not, if the employee has performed competently for over a decade.

In Dowling, the Ontario Divisional Court examined whether after-acquired misconduct could fully extinguish an employee's wrongful dismissal claim. The court held that the after-acquired cause must be evaluated using the same rigorous proportionality standards that apply to any just cause determination. The employer cannot simply point to misconduct in the abstract — they must demonstrate that the misconduct, in context, was fundamentally incompatible with the employment relationship.

The Ontario Court of Appeal in Aasgaard added an important temporal nuance. There, the employee breached fiduciary duties during the working notice period — that is, while still bound by the employment agreement. The court held this gave rise to valid after-acquired cause. But had the misconduct occurred after the employment relationship was effectively repudiated (for example, after an inadequate notice period had expired), the employer could not rely on it.

This distinction matters enormously. The employment relationship must still be alive, in some legal sense, at the time of the misconduct for after-acquired cause to bite.

The Timing Problem: Post-Termination Misconduct

One of the thorniest issues arises when an employer discovers misconduct that occurred before termination but only surfaces after. Courts have consistently held that the mere passage of time between the misconduct and its discovery does not bar an after-acquired cause defence — provided the employer can show genuine ignorance and the absence of condonation.

However, the practical difficulty is proof. If an employee falsified a credential at hiring, the employer effectively accepted the employee and the credential for years. Courts may infer condonation or at least weigh the passage of time against the employer. In Sankreacha v. Cameron J and Beach Sales Ltd., 2018 ONSC 7216, the Ontario Superior Court found no liability where the employer initially pled after-acquired cause but abandoned the defence before trial. The court treated the initial pleading as an opportunity to investigate rather than an act of bad faith.

This signals an important practical reality: employers can plead after-acquired cause while investigating, but they must be prepared to withdraw the defence if the evidence doesn't support it. Maintaining a bad-faith after-acquired cause defence can expose the employer to enhanced damages and cost consequences.

When After-Acquired Cause Actually Works

The cases where after-acquired cause succeeds tend to involve genuinely serious misconduct:

- **Fraud or theft:** Discovery of embezzlement, unauthorized transfers of company funds, or theft of inventory.

- **Breach of fiduciary duty:** Senior employees who were secretly competing with the employer or diverting business opportunities, as in *Aasgaard*.

- **Fundamental dishonesty at hiring:** Fabrication of professional licenses or credentials that are legally required for the role (not minor resume embellishments).

- **Serious policy violations:** Conduct that, objectively measured, makes the continuation of the employment relationship impossible — such as sexual harassment of subordinates discovered post-termination.

Even in these cases, the employer bears the burden. And courts are skeptical. Judges understand the power imbalance and are alert to employers who use after-acquired cause as a litigation tactic to pressure employees into accepting less than they're owed.

The Strategic Reality: A Weapon That Often Backfires

Here is what most employers don't realize until it's too late: pleading after-acquired cause is a high-risk, high-reward strategy. If the employer succeeds, they eliminate the obligation to pay severance. If they fail — and they fail often — they've done several damaging things:

- They've signalled bad faith to the court, potentially increasing damages under the *Honda Canada Inc. v. Keays*, 2008 SCC 39, framework for bad faith in the manner of dismissal.

- They've prolonged litigation, driving up costs for both parties.

- They've made settlement harder, because the employee (rightly) feels attacked and digs in.

The Keays decision made clear that employers who engage in conduct that is "untruthful, misleading, or unduly insensitive" during the dismissal process expose themselves to moral damages. A frivolous after-acquired cause defence can fit squarely within that description.

The case law also establishes that employers cannot use after-acquired cause to claw back statutory minimums under the Employment Standards Act, 2000, S.O. 2000, c. 41. Even if after-acquired cause is established, the employee retains their right to minimum statutory notice or termination pay. What the employer can potentially eliminate is the common law reasonable notice entitlement — the typically much larger sum.

What Employees Should Know

If your former employer suddenly raises after-acquired cause after you've been terminated without cause, understand several things:

1. **They bear the burden of proof.** You don't have to prove your innocence. They have to prove misconduct serious enough to justify termination for cause, retroactively, under the *McKinley* proportionality test.

2. **Timing matters.** If the alleged misconduct occurred after the employment relationship was effectively over, it likely cannot be used.

3. **This may be a litigation tactic.** Employers sometimes raise after-acquired cause to create leverage in settlement negotiations, with no intention of actually proving it at trial.

4. **Get legal advice immediately.** After-acquired cause is a nuanced area of law, and the specific facts of your situation matter enormously.

The Bottom Line

After-acquired cause exists in Canadian employment law, and in the right circumstances, it provides a legitimate defence for employers who genuinely discover serious misconduct post-termination. But it is far from an easy win. Courts demand proportionality, genuine ignorance, and the absence of condonation. Employers who wield it recklessly risk bad-faith findings and enhanced damages.

For employees, the message is clear: don't panic if your former employer raises after-acquired cause. The bar is high, the scrutiny is real, and the doctrine is far more limited than most employers believe it to be.