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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Workers’ Compensation (WSIB) Ontario » WSIB Claims & Workplace Injuries Ontario » Can You Claim WSIB If You Have a Union Grievance Ongoing in Ontario?

Can You Claim WSIB If You Have a Union Grievance Ongoing in Ontario?

29 Jun 2026 4 min read No comments WSIB Claims & Workplace Injuries Ontario
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Yes, you can run a WSIB claim and a union grievance at the same time in Ontario. While the WSIB focuses on your healthcare and Loss of Earnings, a union grievance typically addresses violations of your collective agreement, such as an employer’s failure to accommodate your injury or unjust termination.

For unionized workers in sectors like manufacturing, transit, and public services in cities like Toronto, Ottawa, and Sudbury, getting injured on the job can trigger two separate legal processes. ⚖️ Navigating both the Workplace Safety and Insurance Board (WSIB) and your union’s grievance procedure can feel overwhelming, but understanding how they overlap is vital to maximizing your protection.

A common misconception is that you must choose one path or the other. In reality, the WSIB system and Labour Arbitration handle different aspects of your rights. The WSIB manages the statutory no-fault insurance system, while your union ensures the employer respects the specific rules negotiated in your Collective Bargaining Agreement (CBA).

Step-by-Step Process for Concurrent Claims in Ontario

Managing both proceedings requires careful strategy and open communication between you, your union representative, and potentially a private law firm. Here is how the process generally unfolds.

Step 1: File the WSIB Form 6 and Notify Your Union

Just like any injured worker in Ontario, your first step is to seek medical attention and file a Form 6 with the WSIB. 📝 Immediately after doing this, notify your union steward or local representative. Provide them with copies of your medical restrictions so they can monitor how the employer handles your return to work.

Step 2: Identify Collective Agreement Violations

If the WSIB denies your claim, or if your employer disputes your WSIB claim, that is handled through the WSIB appeals process. However, if your doctor says you can do light duty and your employer refuses to provide it (a failure to accommodate), your union should file a grievance. The grievance process forces the employer to justify why they are ignoring their duty to accommodate under the Human Rights Code and the CBA.

Step 3: Proceed with WSIB Adjudication and Appeals

While the union handles the grievance, you must continue participating in the WSIB process. 📍 If the WSIB cuts off your benefits or denies your claim, you cannot appeal directly to the Workplace Safety and Insurance Appeals Tribunal (WSIAT). You must first submit an Intent to Object (ITO) form to the WSIB’s Appeals Services Division to get a decision from an Appeals Resolution Officer (ARO). Only after receiving a final ARO decision can you appeal to the external WSIAT. Some unions provide representatives (including lawyers or licensed paralegals) for these appeals, while others require you to hire your own independent representative.

Step 4: Navigate Grievance Arbitration

If the grievance cannot be resolved in early meetings, the union may escalate it to a Labour Arbitrator. The Arbitrator can order the employer to reinstate you, pay damages for human rights violations, or provide back pay. Crucially, the Arbitrator will ensure you do not receive “double recovery” (getting paid twice for the exact same lost wages).

How Much Does it Cost in Ontario?

The financial dynamic differs greatly between WSIB proceedings and union grievances. Understanding who pays for what is essential. 💰

  • Grievance Costs: $0 CAD out-of-pocket. Your union dues cover the cost of the union representative and the arbitration process.
  • WSIB Appeals (if using the Union): Free, if your union’s mandate includes representing members at the ARO or WSIAT level (many large Ontario unions do).
  • Private Representation Fees: If your union does not handle WSIB appeals, or if you prefer independent counsel, a private workplace injury lawyer or licensed paralegal will typically charge a contingency fee of 15% to 30% of any retroactive WSIB payout.
FeatureWSIB Process (WSIA)Union Grievance (Labour Arbitration)
Primary FocusInjury benefits, Loss of Earnings, HealthcareCBA violations, Seniority, Human Rights
RepresentationSelf, Private Lawyer, Licensed Paralegal, or UnionUnion Representative only
Final AuthorityWSIAT (Appeals Tribunal)Labour Arbitrator

How Long Does the Process Take?

The WSIB operates on strict statutory timelines: you must claim within 6 months, and you usually have 6 months (or sometimes just 30 days for return-to-work issues) to appeal a negative decision. ⌛ Union grievances, however, are governed by the CBA and often require a grievance to be filed within a few days of the incident. Resolving an arbitration can take 1 to 2 years, depending on the backlog.

Frequently Asked Questions (FAQ)

Can I get double compensation from both WSIB and my grievance?

No. Ontario law strictly prevents “double dipping.” If you lose $5,000 in wages, you cannot recover $5,000 from WSIB and another $5,000 from a grievance arbitration for the exact same loss. However, an arbitrator might award you separate damages for “injury to dignity” under the Human Rights Code, which WSIB does not pay.

Does filing a grievance pause the WSIB time limits?

Absolutely not. Filing a union grievance does not toll (pause) the strict 6-month deadline to file your Form 6 with the WSIB, nor does it pause your deadlines to file an Intent to Object to a WSIB decision. You must meet all WSIB deadlines independently of what is happening with your union.

Can my union stop me from hiring a private lawyer or licensed paralegal for my WSIB claim?

No. While the union has the exclusive right to represent you in the grievance and arbitration process regarding your collective agreement, the WSIB is a separate statutory scheme. You have the right to hire a private Ontario law firm or a licensed paralegal to handle your WSIB claim and appeals if you wish.

What happens if WSIB says I can work, but my own doctor and the union say I cannot?

This is a very common dispute. If WSIB clears you for work but you physically cannot perform the duties, your WSIB benefits may be suspended. You must appeal the WSIB decision using medical evidence. Concurrently, if the employer forces you back into unsafe duties, the union can grieve the unsafe work conditions under the collective agreement.

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