WSIB Claim Deadlines You Can't Afford to Miss (2026)

More Ontario workers lose benefits because of missed deadlines than for almost any other reason. Not because their injuries were not real. Not because they did not deserve compensation. Simply because they did not know a deadline existed until it had already passed.

The WSIB system runs on strict timelines. Miss a filing deadline by even one day, and you may lose your right to benefits entirely. Miss an appeal window, and an unfair decision becomes permanent. The problem is that nobody hands you a checklist of these dates when you get injured.

This guide is that checklist. Every important WSIB deadline is listed below, from the moment you get hurt to the final lock-in of your long-term benefits six years later. Bookmark this page. Share it with anyone navigating a workplace injury in Ontario.

Deadline 1: Report Your Injury to Your Employer — Immediately

Timeline: As soon as possible, within days of the injury

This is the very first step, and it is the one that trips people up the most. There is no hard statutory deadline that says "you must report within X hours," but the reality is that delayed reporting is one of the top reasons WSIB questions whether an injury is work-related.

Why Timing Matters

• WSIB looks at how quickly you reported as an indicator of legitimacy
• Your employer needs to know so they can file their own form (Form 7)
• Medical records from your first treatment should align with when you reported
• Delayed reporting gives your employer grounds to dispute the claim

What to Do

• Tell your supervisor verbally right away, then follow up in writing (email or text)
• If your injury developed over time (like repetitive strain), report it as soon as you realize it is work-related
• Get medical attention the same day or the next day if possible
• Keep a copy of everything you send to your employer

Bottom line: Report immediately. Every day you wait makes your claim harder to prove.

Deadline 2: File Form 6 (Worker's Report) — Within 6 Months

Timeline: Within 6 months of the injury, but file as early as possible

Form 6 is the worker's official report of injury to WSIB. While the law gives you up to 6 months, filing early is critical.

The 6-Month Rule

Under the Workplace Safety and Insurance Act, you have 6 months from the date of injury (or the date you become aware that the condition is work-related) to file Form 6. After 6 months, WSIB can refuse to consider your claim.

Why You Should File Much Sooner

• WSIB starts processing your claim faster, which means benefits start sooner
• Early filing creates a clear timeline that supports your case
• Delays raise questions about whether the injury is really work-related
• Your memory of the incident is freshest right after it happens
• Medical evidence is strongest when it is documented close to the injury date

How to File

• Online through WSIB's website
• By phone at 1-800-387-0750
• By mail or fax (download the form from wsib.ca)

Best practice: File Form 6 within one to two weeks of your injury. Do not wait for your employer to file first.

Deadline 3: Employer Files Form 7 — 3 Business Days

Timeline: Your employer must file within 3 business days of learning about the injury

This is your employer's obligation, not yours. But you need to know about it because if your employer fails to file Form 7, your claim can be delayed.

What Form 7 Contains

• When and where the injury happened
• What the worker was doing at the time
• Whether modified work is available
• The employer's account of the incident

What to Do If Your Employer Does Not File

• Ask your employer directly whether they have submitted Form 7
• If they refuse or delay, file your Form 6 anyway — you do not need to wait for your employer
• Contact WSIB to report that your employer has not filed
• Document the dates you asked your employer to file

Employers who fail to file Form 7 on time can face penalties from WSIB.

Deadline 4: Intent to Object / Reconsideration — 30 Days

Timeline: 30 days from the date of the WSIB decision

This is the deadline that catches the most workers off guard. When WSIB makes a decision you disagree with — whether it is a denial, a benefit reduction, or a return-to-work determination — you have just 30 days to request a review.

How the 30-Day Clock Works

• The clock starts on the date printed on the WSIB decision letter
• It does not matter when you receive the letter — the date on the letter is what counts
• Weekends and holidays are included in the 30 days
• If you miss this deadline, you lose your right to internal reconsideration through an Appeals Resolution Officer (ARO)

What Happens During Reconsideration

An Appeals Resolution Officer (ARO) reviews your case independently. They were not involved in the original decision, so they take a fresh look at the evidence. You can submit new medical reports, witness statements, or other documentation to strengthen your case.

How to File

• Call WSIB and state that you are filing an Intent to Object
• Follow up in writing with the reasons you disagree with the decision
• Include any new evidence that supports your position

Do not wait until day 29. File your Intent to Object as soon as you receive the decision, even if you need more time to gather evidence. You can submit supporting documents after you have filed the objection.

Deadline 5: WSIAT Appeal — 6 Months

Timeline: 6 months from the final decision of the Appeals Resolution Officer (ARO)

If the ARO review does not go in your favour, your next step is the Workplace Safety and Insurance Appeals Tribunal (WSIAT). This is an independent body outside of WSIB.

The 6-Month Window

• You have 6 months from the ARO's final decision to file a WSIAT appeal
• WSIAT can extend this deadline in some cases, but do not count on it
• The appeal must be filed in writing using WSIAT's Notice of Appeal form

What Makes WSIAT Different

• WSIAT is fully independent from WSIB
• You can present your case in person at a hearing
• You can call witnesses, including medical experts
• WSIAT decisions are binding on WSIB
• Many decisions that were denied by WSIB and upheld by ARO are overturned at WSIAT

Getting Help

WSIAT hearings are more formal than ARO reviews. Many workers benefit from having a licensed paralegal or lawyer represent them. The Office of the Worker Adviser (OWA) also provides free legal assistance for WSIAT appeals.

Deadline 6: Non-Economic Loss (NEL) Assessment — After Maximum Medical Recovery

Timeline: Typically 12 or more months after injury, after you reach Maximum Medical Recovery (MMR)

The NEL benefit is a one-time lump sum payment for permanent impairment caused by your workplace injury. The assessment window opens after your doctor determines you have reached Maximum Medical Recovery — the point where your condition is not expected to improve significantly with further treatment.

Key Points About NEL Timing

• There is no fixed deadline for the NEL assessment, but it typically happens 12 to 24 months after injury
• WSIB should schedule the assessment automatically, but this does not always happen
• If WSIB has not raised the topic of NEL by 18 months post-injury, ask about it
• You can request a NEL assessment if you believe you have permanent impairment

What Happens During a NEL Assessment

• A WSIB-approved health professional evaluates your permanent impairment
• They assign a percentage rating based on the AMA Guides to the Evaluation of Permanent Impairment
• Your lump sum payment is calculated based on this rating, your age at injury, and the maximum NEL amount set by WSIB

If You Disagree With Your NEL Rating

You can challenge your NEL rating through the same appeal process: 30 days to file an Intent to Object, then 6 months for WSIAT if needed. Many workers receive a higher rating after appealing with additional medical evidence.

Deadline 7: The 72-Month LOE Review — 6 Years After Injury

Timeline: 72 months (6 years) from your date of injury

This is the final and most consequential deadline in a long-term WSIB claim. At the 72-month mark, WSIB conducts a final review of your Loss of Earnings benefits and locks them in permanently.

Why This Deadline Matters

• After 72 months, your LOE benefit amount is fixed and generally cannot be changed
• WSIB may use "deemed" earnings — what they believe you could earn, not what you actually earn — to reduce your benefits before locking them in
• Workers who are not prepared often see significant benefit reductions at this stage
• The preparation window begins around month 67, so you need to act well before the deadline

How to Prepare

• Calculate your 72-month date (injury date + 6 years) and mark it
• Get updated medical documentation at least 6 months before
• Request details of any Suitable Employment or Business plan WSIB has identified
• Consider an independent vocational assessment if you disagree with WSIB's determination
• Consult with a representative before the review, not after

For a detailed guide on preparing for this review, see our article: The WSIB 72-Month LOE Review: What Changes and How to Prepare.

Other Important Timelines to Track

Annual Benefit Indexing — January 1 Each Year

WSIB adjusts LOE benefits annually for inflation on January 1. Check your payment after each adjustment to make sure it was applied correctly.

Return-to-Work Cooperation — Ongoing

WSIB requires you to cooperate with return-to-work (RTW) efforts throughout your claim. Failure to cooperate can result in benefit reductions at any time. Keep records of every RTW meeting, accommodation request, and medical restriction you communicate.

Age 65 — Benefits End

For most workers, LOE benefits end at age 65. If you were 63 or older at the time of injury, benefits continue for a maximum of 2 years after the injury date.

The Complete WSIB Deadline Cheat Sheet

Never Miss a Deadline Again

The biggest risk to your WSIB claim is not knowing what is coming next. Every deadline listed above can be calculated from dates already in your file — your injury date, your decision dates, and your medical milestones.

Let ClaimNexus track your deadlines for you.

Our Deadline Calculator maps every critical WSIB timeline to your specific dates. Enter your injury date, and you will see exactly when Form 6 is due, when your 72-month review is coming, and every appeal window in between.

No more guessing. No more missed windows. No more lost benefits because of a date you did not know about.

Calculate your WSIB deadlines →

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This article is for informational purposes only and does not constitute legal advice. WSIB policies and timelines may change. For advice specific to your situation, consult with a licensed paralegal, lawyer, or contact WSIB directly at 1-800-387-0750.