TLDR: A mass termination in Ontario is triggered when 50 or more employees are terminated at one establishment within a four-week period. The Employment Standards Act imposes enhanced notice periods (8, 12, or 16 weeks), a mandatory Form 1 filing with the Ministry of Labour, and — as of 2025 — new obligations to provide an Employment Ontario Career Supports sheet and a three-day job-seeking leave. Severance pay may also apply. Common law notice typically exceeds ESA minimums. Failing to file Form 1 correctly is the single most costly mistake employers make.
What Is a Mass Termination in Ontario?
Ontario’s Employment Standards Act (ESA) treats large-scale workforce reductions differently from individual terminations. Under Part XV of the ESA, a mass termination occurs when an employer terminates 50 or more employees at a single establishment within any four-week period.
When that threshold is crossed, the ordinary rules about individual notice entitlements are replaced by a separate framework with longer notice periods, a government filing requirement, and — since 2025 — additional employee support obligations. The rationale is straightforward: employees losing their jobs as part of a large restructuring face longer job searches in a flooded local labour market, and the law gives them more runway to prepare.
What counts as an “establishment” matters. The ESA defines it as the location or locations where an employer carries on business. A company with offices in Toronto and Mississauga is generally considered to have two establishments. Remote workers are typically counted against the establishment to which they are assigned, not their home address.
When mass termination rules apply vs. individual termination rules
| Scenario | Rules That Apply | Key Difference |
|---|---|---|
| Fewer than 50 terminations in 4 weeks | Individual ESA termination notice (1–8 weeks by length of service) | Notice based on individual tenure |
| 50–199 terminations in 4 weeks | Mass termination: 8 weeks for everyone | Group notice replaces individual calculations |
| 200–499 terminations in 4 weeks | Mass termination: 12 weeks for everyone | Group notice applies regardless of tenure |
| 500+ terminations in 4 weeks | Mass termination: 16 weeks for everyone | Maximum group notice tier |
One important nuance: the mass termination notice period can actually be shorter than individual ESA notice for newer employees in a large workforce reduction. A five-year employee in an individual termination would be entitled to 5 weeks of ESA notice. In a mass termination of 200+ employees, the statutory minimum rises to 12 weeks — a significant difference for the employer’s financial exposure.
Mass Termination Notice Requirements
The enhanced notice periods under the ESA are fixed by headcount, not by individual length of service:
| Number of Employees Terminated | Statutory Notice Period | Who Gets This Notice |
|---|---|---|
| 50 to 199 employees | 8 weeks | All employees affected at that establishment |
| 200 to 499 employees | 12 weeks | All employees affected at that establishment |
| 500 or more employees | 16 weeks | All employees affected at that establishment |
Working notice vs pay in lieu
Employers can fulfil the mass termination obligation in three ways:
- Working notice: Employees continue working through the full notice period and are paid their regular wages.
- Pay in lieu: The employer pays the equivalent of the notice period wages as a lump sum or continuation, and the employment ends immediately.
- A combination: Some working notice followed by pay in lieu for the remainder.
A word of caution on extended working notice: the Ontario Court of Appeal confirmed in Wood v. CTS of Canada Co. that employees cannot be required to work beyond 13 weeks past the original termination date without the employer issuing fresh notice. If operational needs push the actual departure date past that 13-week mark, the employer must start the notice clock again — a costly error in slow-moving restructurings.
Form 1: The Step Most Employers Get Wrong
Filing Form 1 is not optional, and the consequences of getting it wrong are severe. The ESA is explicit: individual employee notices do not begin to run until Form 1 is received by the Director of Employment Standards. This means that even if you have already told employees their jobs are ending, the statutory clock has not started until the government has the form in hand.
What Form 1 must include
- The employer’s legal name and contact information
- The address of the establishment affected
- The total number of employees at the establishment
- The number of employees being terminated and their classifications
- The anticipated dates of termination
- The reason for the terminations
- Whether the termination involves a permanent discontinuance of business
Filing and posting requirements
Form 1 must be submitted to the Director of Employment Standards by email, fax, mail, or personal delivery. On the first day of the notice period, the employer must:
- Post a copy of Form 1 in the workplace in at least one conspicuous location where affected employees are likely to see it
- Provide a copy to each individual employee being terminated
- Provide all three mandatory documents together (see the next section for the 2025 additions)
The Form 1 must remain posted throughout the entire notice period. Removing it early is a compliance failure that can trigger Ministry scrutiny.
New Obligations Since 2025
Two amendments to the mass termination framework came into force in 2025, and many Ontario employers are not yet aware of them.
Employment Ontario Career Supports information sheet (July 1, 2025)
Since July 1, 2025, employers must provide all affected employees with a Ministry of Labour–prepared Employment Ontario Career Supports information sheet on the first day of the notice period. This document gives employees access to:
- Job matching and skills training referrals
- Financial assistance for training, transportation, and dependent care costs
- Labour market information for over 500 occupations
- Paid training opportunities and apprenticeship pathways
The sheet must be the current version from the Ministry’s website and must be made available in both English and French where applicable. Employers should download a fresh copy at the time of each mass termination to ensure they are distributing the most recent version.
Job-seeking leave (November 27, 2025)
The Working for Workers Five Act (2024) introduced a new entitlement effective November 27, 2025: affected employees in a mass termination are entitled to up to three days of unpaid, job-protected leave during the notice period for activities related to finding new employment. This includes attending interviews, meeting with employment agencies, completing applications, or participating in job search workshops.
Employers cannot discipline or terminate an employee for taking this leave, and the days do not reduce the employee’s termination pay entitlement. Internal policies and leave tracking systems should be updated to reflect this new entitlement.
Benefits Continuation During the Notice Period
Whether the employer provides working notice or pay in lieu, the obligation to maintain group benefit contributions continues through the entire ESA notice period. This includes health, dental, life insurance, and disability coverage.
Cutting off benefits before the ESA notice period expires is one of the most common — and expensive — errors in mass terminations. It can result in Ministry orders to pay the value of lost coverage, civil claims from employees who incurred medical expenses during the gap, and aggravated damages if the deprivation was callous or high-handed.
If the employer is providing pay in lieu, it must either maintain the benefits enrollment through the notice period or provide the cash equivalent of the employer’s contributions.
Severance Pay vs Termination Pay
These are two distinct entitlements. Many Ontario employers conflate them, which leads to underpayment and legal exposure.
| Feature | Termination Pay (ESA) | Severance Pay (ESA) |
|---|---|---|
| What it is | Compensation for lack of adequate notice | Compensation for loss of seniority and career disruption |
| Who qualifies | All employees with 3+ months service who are terminated without sufficient notice | Employees with 5+ years service, AND employer meets payroll/size threshold |
| Employer threshold | None | Ontario payroll ≥ $2.5 million OR permanent discontinuance with 50+ terminations |
| Calculation | 1 week per year of service, up to 8 weeks | 1 week per completed year of service (+ pro-rated months), up to 26 weeks |
| Can be reduced by working notice? | Yes — working notice reduces or eliminates termination pay | No — severance pay is always owed regardless of notice given |
| Common in mass terminations? | Always applies when notice is insufficient | Applies to any qualified employee when employer meets size threshold |
Employers with large Ontario payrolls restructuring a significant portion of their workforce should assume that most long-tenured employees will be entitled to both. A 10-year employee at a $5M-payroll employer terminated with pay in lieu is owed 8 weeks of termination pay (ESA minimum) plus 10 weeks of severance — a combined 18 weeks — before any common law considerations.
Employee Rights in a Mass Termination
Resignation rights
An employee who receives mass termination notice is not locked in. They can resign and still collect their termination pay entitlement, with reduced resignation notice obligations:
| Employee Length of Service | Notice Required to Resign | Effect on Termination Pay |
|---|---|---|
| Less than 2 years | 1 week | Full ESA termination pay is still owed |
| 2 years or more | 2 weeks | Full ESA termination pay is still owed |
Job-seeking leave
As described above, since November 27, 2025, employees are entitled to up to three days of unpaid, job-protected leave during the mass termination notice period for job-search activities. This leave is in addition to any other leave entitlements the employee may have.
Employment Ontario resources
Employees are entitled to receive the Employment Ontario Career Supports information sheet on the first day of the notice period. This connects them to retraining programs, financial supports, and job placement services at no cost.
The 10% Exception
The mass termination regime does not apply in every large-scale layoff. Two conditions must both be met for the exception to apply:
- The employees being terminated represent 10% or less of the employees who have been employed for three months or more at that establishment; AND
- The terminations do not result from the permanent discontinuance of all or part of the employer’s business at that establishment.
This exception exists to prevent the mass termination rules from being triggered by routine workforce adjustments at very large employers. A 1,000-person facility terminating 55 employees for performance reasons would fall within this exception and be subject to individual termination notice instead.
However, employers planning restructurings near the 10% threshold should take care. If a business closure is involved — even a partial one — the exception evaporates regardless of the percentage. Employers who restructure in waves to stay below 10% in any given four-week period may also find that the Ministry views the terminations as a single event if they are connected to a common reason.
Common Law Notice and Mass Terminations
The ESA sets minimum floors, not ceilings. Unless an employee has a valid written termination clause capping their entitlement to ESA minimums, the common law right to reasonable notice applies — and it almost always exceeds the statutory minimums in a mass termination context.
Courts use the Bardal factors to determine reasonable notice: age, length of service, character of the employment, and the availability of comparable employment. In a mass termination scenario, the “availability of comparable employment” factor typically weighs heavily against the employer. When hundreds of employees in the same industry are simultaneously entering the job market, finding comparable work takes longer, and courts award longer notice periods accordingly.
What this means for severance packages
| Employee Profile | ESA Minimum | Common Law Range | Why the Gap Matters |
|---|---|---|---|
| 45-year-old manager, 12 years service, mid-senior role | 8–12 weeks (depending on group size) | 18–30 months | Significant damages exposure without valid termination clause |
| 32-year-old specialist, 4 years service | 8–12 weeks | 6–12 months | ESA alone leaves employer legally vulnerable |
| 58-year-old supervisor, 20 years service | 8–16 weeks | 24–36 months | Age + seniority + specialized role = highest exposure |
| 25-year-old front-line worker, 1 year service | 8 weeks (group notice) | 4–8 weeks | ESA notice may actually be more than common law |
Employers with valid, ESA-compliant termination clauses in their employment agreements are protected from common law claims. Employers relying on old agreements — particularly any that were drafted before the Waksdale decision in 2020 — should have those clauses reviewed before proceeding with any restructuring. A single invalid clause in a “for cause” section can void the entire termination regime, reinstating full common law rights.
For more on termination clause enforceability, see our guide to employment contracts in Ontario.
Common Employer Mistakes in Mass Terminations
| Mistake | What Goes Wrong | Risk Level |
|---|---|---|
| Filing Form 1 late or incompletely | Notice clock never starts; working notice already provided may not count | High — directly extends termination pay liability |
| Cutting off benefits before the notice period ends | Ministry orders, civil claims for out-of-pocket medical costs, aggravated damages | High — common and costly |
| Not distributing the Employment Ontario Career Supports sheet (required since July 2025) | ESA violation, Ministry enforcement action | Medium — new requirement many employers don’t know about |
| Ignoring the job-seeking leave entitlement (effective November 2025) | ESA violation if leave request is denied; potential reprisal complaint | Medium — most employers unaware of this new right |
| Relying on unreviewed termination clauses | Invalid clause = common law notice applies; can mean months of additional exposure | Very High |
| Misclassifying layoffs as “temporary” to avoid mass termination rules | ESA temporary layoff rules have strict time limits; can become deemed termination | High |
| Forgetting severance pay for qualifying employees | Separate from termination pay; often missed for large-payroll employers | High |
| Not counting all affected employees toward the threshold | Under-counting remote workers or workers at sub-locations may push employer below threshold inappropriately | Medium |
Mass Termination Compliance Checklist for Ontario Employers
| Action | When | Owner |
|---|---|---|
| Determine whether terminations meet the 50-employee threshold at each establishment | Before announcement | HR / Legal |
| Confirm whether the 10% exception applies | Before announcement | HR / Legal |
| Review all employment agreements for valid termination clauses (post-Waksdale) | Before announcement | Legal counsel |
| Calculate each affected employee’s ESA termination pay and severance pay entitlements | Before announcement | HR / Payroll |
| Complete Form 1 in full and submit to Director of Employment Standards | Day 1 of notice period | HR |
| Post Form 1 in a conspicuous location at the establishment | Day 1 of notice period | HR |
| Provide each affected employee with: written notice, copy of Form 1, Employment Ontario Career Supports sheet | Day 1 of notice period | HR |
| Confirm benefits continuation arrangements through the full notice period | Day 1 of notice period | HR / Benefits |
| Update HR policies and leave tracking to reflect the 3-day job-seeking leave entitlement | Before notice period | HR |
| Document all steps for Ministry audit trail | Throughout | HR |
| Issue ROEs within 5 business days after final pay | After termination date | Payroll |
When to Get HR and Legal Support
Mass terminations are among the highest-stakes employment events an Ontario employer can face. The combination of government filing requirements, enhanced notice periods, benefits obligations, common law exposure, and recent statutory changes means that doing this without professional support is genuinely risky.
Consider getting HR or legal support if:
- You have not reviewed your employment agreements since 2020 (the Waksdale decision year)
- You have employees with more than five years of service who may be owed severance pay
- You are uncertain whether your situation triggers the 10% exception
- The restructuring involves a business closure or sale
- Any affected employees are on WSIB, accommodation, or protected leave at the time of termination
- You have employees working in multiple provinces or under federal jurisdiction
HRX Connect works with Ontario employers on workforce restructuring, mass termination compliance, and employment agreement review. Contact us to discuss your situation before proceeding.
For more foundational context, see our guides to termination and severance pay in Ontario and wrongful dismissal.
Frequently Asked Questions
What is a mass termination in Ontario?
A mass termination in Ontario occurs when an employer terminates 50 or more employees at the same establishment within a four-week period. When this threshold is reached, the Employment Standards Act replaces individual termination notice with enhanced group notice periods of 8, 12, or 16 weeks depending on the number of employees affected.
How much notice is required for a mass termination in Ontario?
The required notice depends on the number of employees terminated: 8 weeks for 50 to 199 employees; 12 weeks for 200 to 499 employees; and 16 weeks for 500 or more employees. These notice periods replace individual notice entitlements, though common law reasonable notice may still apply and often exceeds these statutory minimums.
What is Form 1 and when must it be filed?
Form 1 (Notice of Termination of Employment) is a mandatory document that Ontario employers must file with the Director of Employment Standards on the first day of the notice period. Critically, the statutory notice period does not begin until the Director receives the completed Form 1. Filing late means losing credit for any working notice already provided, potentially extending the employer’s obligations.
Does severance pay apply in a mass termination?
Yes, severance pay is separate from termination pay and applies when: (1) an employee has 5 or more years of service, AND (2) the employer has an Ontario payroll of $2.5 million or more, OR is permanently discontinuing business with 50 or more terminations within a six-month period. Severance is calculated at one week per completed year of service, up to a maximum of 26 weeks.
Do remote workers count toward the mass termination threshold?
Yes. Remote workers are counted toward the 50-employee threshold if they are employed at the same establishment. The Ministry of Labour considers the establishment to be the primary location where the employer carries on business, even for hybrid or remote arrangements where the employee reports to that location.
Can employees resign during a mass termination notice period?
Yes. Employees who receive mass termination notice have a right to resign with reduced notice. An employee with less than two years of service may resign with one week’s notice; an employee with two or more years of service may resign with two weeks’ notice. They remain entitled to their full ESA termination pay despite resigning early.
What is the 10% exception to mass termination rules?
Mass termination rules do not apply if two conditions are both met: the terminated employees represent 10% or less of the employees who have been employed for three months or more at that establishment, AND the terminations do not result from the permanent discontinuance of all or part of the employer’s business at that establishment.
What new obligations came into effect in 2025 for mass terminations?
Two significant changes took effect in 2025. As of July 1, 2025, employers must provide all affected employees with a Ministry-prepared Employment Ontario Career Supports information sheet on the first day of the notice period. As of November 27, 2025, affected employees are entitled to up to three days of unpaid, job-protected leave during the notice period to engage in job-searching activities.
Sources: Ontario Ministry of Labour – ESA Guide to Termination | Hicks Morley – Updated Mass Termination Obligations (2025) | SOM Law – Mass Termination Primer