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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Workers’ Compensation (WSIB) Ontario » WSIB Claims & Workplace Injuries Ontario » WSIB Claims Involving Co-Worker Assaults or Physical Altercations in Ontario

WSIB Claims Involving Co-Worker Assaults or Physical Altercations in Ontario

15 Jun 2026 4 min read No comments WSIB Claims & Workplace Injuries Ontario
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If you are injured in a physical altercation at work in Ontario, WSIB may cover your injuries-including traumatic mental stress-provided the dispute was directly related to your work and you were not the primary aggressor. Standard WSIB forms must be filed, and there are $0 filing fees.

Workplace violence is a serious issue, and unfortunately, physical altercations between co-workers do happen. Whether it is a heated argument on a factory floor in London that turns physical, or an aggressive dispute at a Toronto restaurant, suffering an assault at work is terrifying 😨. A common question among injured workers is whether the Workplace Safety and Insurance Board (WSIB) will cover medical bills and lost wages resulting from a fight. The short answer is yes, but the circumstances surrounding the altercation matter significantly.

In Ontario, the general rule of thumb is that an injury must “arise out of and in the course of employment.” This means if the fight was about a work-related issue-such as a disagreement over how to operate a forklift or a dispute over a work schedule-WSIB is highly likely to approve the claim. However, if the fight was purely a personal matter brought into the workplace, coverage may be denied. Understanding how the WSIB adjudicates these specific claims is crucial to securing the benefits you need .

Step-by-Step Process for Workplace Assault Claims in Ontario

Handling a claim that involves violence requires extra care, as it often involves workplace investigations and sometimes local law enforcement. Whether you are in Mississauga, Ottawa, or Kingston, here is how you should proceed.

Step 1: Seek Safety and Medical Attention

Your physical safety is the absolute priority 🚨. If you have been assaulted, remove yourself from the danger immediately and seek medical attention at a local hospital or clinic. Let the treating physician know that the injuries were sustained during a workplace assault. Depending on the severity of the altercation, you or your employer should also contact the local police service to report the incident. A police report serves as powerful, objective evidence later on.

Step 2: Report the Incident to Your Employer

Ontario’s occupational health and safety laws require employers to investigate all instances of workplace violence. You must report the assault to your supervisor or HR department as soon as safely possible. They are legally obligated to fill out an Employer’s Report of Injury (Form 7). Be completely honest and clear about what happened, ensuring that the work-related nature of the dispute is documented .

Step 3: File Your WSIB Worker’s Report

You must submit a Form 6 (Worker’s Report of Injury) to the WSIB. In the description section, clearly explain the events that led to the altercation. Emphasize any work-related factors that caused the dispute. If the other person attacked you unprovoked, make sure that is explicitly stated. The WSIB will assign an adjudicator who will likely interview you, your employer, and any witnesses to determine the root cause of the fight.

How Much Does it Cost in Ontario?

Navigating the financial side of a workplace assault claim is straightforward when it comes to government fees.

Type of ExpenseEstimated Cost (CAD)
Filing Form 6 with WSIB$0 (No cost to the worker).
Police Report Copy$30 – $60 (Depends on the municipal police service).
Psychological CounselingCovered by WSIB if approved for Traumatic Mental Stress.
Lawyer or Paralegal FeesOften a percentage of retroactive pay if the claim is initially denied and requires an appeal.

If your claim is complex-for example, if the employer wrongly accuses you of starting the fight-many injured workers opt to hire a local Ontario law firm. Having legal representation can ensure witness statements are properly collected and presented.

How Long Does the Process Take?

Assault claims generally take longer to adjudicate than standard slip-and-fall injuries. Because the WSIB must determine liability and investigate the cause of the dispute, initial processing can take anywhere from 4 to 12 weeks. If the claim includes Traumatic Mental Stress, gathering the necessary psychological evaluations can extend the timeline to 3 to 6 months before regular benefits stabilize .

Frequently Asked Questions (FAQ)

What if I threw the first punch?

Generally, the WSIB will not provide compensation to a worker who was the primary aggressor or instigator of the physical violence. The system is designed to protect innocent parties or those who were reasonably defending themselves.

Does WSIB cover fights over personal matters?

Usually, no. If two co-workers get into a physical fight over a personal debt, a romantic relationship, or matters unrelated to their jobs, the WSIB generally views this as a personal dispute that merely happened to take place on company property. The injury must arise out of the employment.

Can I sue my co-worker instead of taking WSIB?

In Ontario, the WSIA generally removes your right to sue your employer or a co-worker for a workplace injury. This is known as the historic trade-off. However, there are very rare exceptions for intentional acts of extreme violence, which you should discuss with a lawyer.

Can I claim mental stress after being assaulted?

Yes. The WSIB recognizes Traumatic Mental Stress. If a sudden, unexpected, and traumatic event like a workplace assault causes conditions like PTSD or severe anxiety, you may be entitled to compensation for lost wages and psychological therapy.

What if my employer tries to hide the incident?

It is an offence under the WSIA for an employer to suppress a claim. You should file your Form 6 directly with the WSIB regardless of what your employer does. You may also want to report the unsafe environment to the Ministry of Labour.

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