If an Ontario business terminates 50 or more employees within a four-week period, it triggers mass termination rules under the Employment Standards Act (ESA). Employers must provide enhanced notice periods and legally file a Form 1 with the provincial Ministry of Labour.
Closing a business location, downsizing a factory, or conducting a large-scale corporate restructuring is a difficult reality for many companies. 📈 In Ontario, when an employer lets go of a significant number of staff in a short timeframe, standard termination rules no longer apply. The province mandates enhanced protections to help large groups of workers transition into new employment.
Whether your corporate headquarters is in Toronto, a manufacturing plant in Windsor, or a tech firm in Kitchener, navigating a mass termination requires strict legal compliance. Failing to properly execute these steps can result in severe financial penalties and lawsuits. This guide outlines the exact process you must follow to remain compliant with Ontario law as of May 2026.
Step-by-Step Process for Mass Terminations in Ontario
A mass termination occurs when the employment of 50 or more employees is terminated at a single establishment within a four-week period. 📅 Here is the step-by-step process most employers follow to handle this legally.
Step 1: Determine if the Threshold is Met
First, you must accurately count the number of affected workers. This count includes full-time, part-time, and seasonal employees working at or connected to the same establishment. Under the Working for Workers Four Act, 2024 (Bill 149), fully remote employees who are associated with the establishment are also included in the headcount. If you terminate 49 people, standard individual notice rules apply. The moment you hit the 50-person mark within a rolling four-week window, the mass termination rules activate.
Step 2: Calculate Enhanced Notice Periods
Under a mass termination, the standard notice periods (which are usually based on an individual’s length of service) are replaced by strict, mandatory group minimums. 💰 The amount of working notice-or pay in lieu of notice-depends entirely on the total number of people being let go:
- 50 to 199 employees: You must provide at least 8 weeks of notice.
- 200 to 499 employees: You must provide at least 12 weeks of notice.
- 500 or more employees: You must provide at least 16 weeks of notice.
Step 3: Complete and File Form 1
Before any notice is officially valid, the employer must complete and file a specific provincial document. This is called a Form 1: Notice of Termination of Employment. You must officially file this form with the Director of Employment Standards at the Ontario Ministry of Labour, Immigration, Training and Skills Development. No notice of mass termination is legally effective until the Director receives the Form 1.
Step 4: Post and Distribute the Form 1 and Support Materials
Filing the form is not enough; active transparency with your staff is legally required. 📣 On the very first day of the notice period, you must post a copy of the completed Form 1 in a conspicuous location within your workplace. Furthermore, under changes to the ESA that took effect on July 1, 2025, you must also provide each affected employee with a personal copy of the completed Form 1 as well as the most recent version of the Employment Ontario Career Supports information sheet published by the Ministry.
Step 5: Provide Individual Notice, Job-Seeking Leave, and Severance Pay
Every affected employee must receive an individual termination letter detailing their specific end date. Under regulations in effect since November 27, 2025, employees who receive working notice under a mass termination are entitled to a job-protected, unpaid Job Seeking Leave of up to three days during their notice period to attend interviews and participate in job searches. If an employee qualifies for severance pay (usually those with 5+ years of service at a company with a global payroll of $2.5 million CAD or more), you must pay this out in addition to any mass termination notice pay.
How Much Does it Cost in Ontario?
A mass termination is one of the most expensive processes an employer can undertake. 💵 You should carefully budget for the following:
- Form 1 Filing Fee: Submitting the form to the Ministry is completely free.
- Pay in Lieu of Notice: If you cannot provide working notice, you must pay out the 8, 12, or 16 weeks of wages for every single affected employee. This often runs into the millions of dollars (CAD).
- Severance Pay: Up to 26 weeks of additional pay per eligible employee.
- Lawyer Fees: An employment lawyer assisting with mass termination logistics will typically charge between $400 CAD and $800 CAD per hour.
How Long Does the Process Take?
The timeline is strictly dictated by the number of employees. ⏱ If you are terminating 300 employees, you must begin the process at least 12 weeks before their final day of work. The Ministry of Labour processes the Form 1 immediately upon receipt, but the notice period only officially starts the day the Director receives the form.
| Number of Employees Terminated | Mandatory Notice Period | Requirement to File Form 1 |
|---|---|---|
| 1 to 49 | Individual rules apply (1-8 weeks based on tenure) | No |
| 50 to 199 | 8 weeks minimum | Yes |
| 200 to 499 | 12 weeks minimum | Yes |
| 500+ | 16 weeks minimum | Yes |
Frequently Asked Questions (FAQ)
What happens if an employer fails to file a Form 1?
If the Form 1 is not filed with the Ministry of Labour, the mass termination notice provided to employees is considered legally invalid. The notice period clock will not officially start until the form is received by the Director, meaning you may have to pay additional wages to cover the delay.
Do part-time employees count towards the 50-person threshold?
Yes. The ESA considers both full-time and part-time workers when determining if the 50-employee threshold has been reached within a four-week period.
Can we give pay in lieu of notice instead of working notice?
Yes. Employers in Ontario have the option to provide working notice, a lump-sum payment in lieu of notice, or a combination of both, as long as the total value meets the strict statutory minimums.
Are there any exceptions to the mass termination rules?
There are rare exceptions. For example, if the mass termination accounts for less than 10% of the employees at the establishment, and none of the terminations are caused by the permanent discontinuance of part of the business, regular individual notice rules may apply. You should consult a local employment lawyer to verify exceptions.
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