Tens of thousands of Quebecers are hurt on the job every year. Here is how the CNESST system actually works, what you can claim, and the deadlines you cannot afford to miss.
If you are injured on the job in Quebec, your claim is handled by the CNESST, the provincial workplace health and safety board (Commission des normes, de l’equite, de la sante et de la securite du travail). It covers roughly 3.8 million workers, about 92 percent of the province’s workforce, and in 2022 alone it logged close to 162,000 workplace injuries. Yet for many Montrealers, especially English speakers facing a French-language bureaucracy, the process feels opaque the moment something goes wrong.
That confusion is costly, because the system runs on strict deadlines and specific paperwork. Knowing your rights early, and knowing when to call a CNESST lawyer, is often the difference between a smooth claim and a denied one. This guide walks through what the CNESST covers, what you can claim, where claims tend to fall apart, and the timelines that decide everything.
What the CNESST actually covers
The CNESST handles two main categories of harm. The first is the employment injury, the sudden event most people picture: a fall from scaffolding, a machine that catches a hand, a delivery driver rear-ended on the job. The second is an occupational disease, a condition that develops over time because of the work itself, such as tendinitis from repetitive motion, hearing loss from chronic noise exposure, or a respiratory illness from exposure on a worksite.
Two other situations matter just as much. A relapse, recurrence or aggravation lets you reopen a file when an old work injury flares up again. And psychological injuries, including those tied to workplace harassment, can also be compensable when they are linked to the job. The common thread is the causal link: you have to show the harm came from your work, which is exactly where many disputes begin.
What you can claim
A compensable CNESST claim can include several distinct benefits, and workers often do not realize how many apply to them:
- Income replacement indemnity. Once you cannot work because of the injury, you are generally entitled to 90 percent of your net income. Your employer typically pays the first 14 days, and the CNESST takes over after that.
- Medical and related costs. Treatment, medication, physiotherapy, travel to appointments and certain assistive devices can be reimbursed.
- Compensation for permanent injury. If the accident leaves lasting physical or psychological after-effects, you may be owed a lump sum for that permanent impairment.
- Rehabilitation and return to work. This covers retraining, workplace adaptation and support when you cannot go back to the exact job you had before.
The deadlines that make or break a claim
More CNESST files are lost to missed deadlines than to weak facts. The timeline below is the one to keep on the fridge. Miss a window, and you can forfeit a legitimate claim no matter how strong it is.
| Step | Deadline | What it means |
| Tell your employer | As soon as possible | Report the accident before you leave the workplace if you can, so there is a record of it. |
| See a doctor | Right away | You need a medical certificate (attestation medicale) linking the injury to your work. |
| File your claim with the CNESST | Within 6 months of the injury | Submit the Worker’s Claim form. Late filing can cost you the claim entirely. |
| Ask for an administrative review | Within 30 days of the decision | If a CNESST decision goes against you, this is the first level of challenge. |
| CNESST issues a review decision | Within about 90 days | A different officer re-examines the file and renders a new decision. |
| Contest at the Tribunal administratif du travail | Within 60 days of the decision | The independent tribunal that has the final say on most disputes. |
Two of those deadlines deserve emphasis. The 30-day window to request an administrative review and the 60-day window to go to the Tribunal administratif du travail are short, they start running from the day you receive the decision, and they are rarely extended. If a CNESST letter lands in your mailbox and you disagree with it, the clock is already ticking.
Where claims go wrong
Most denied or underpaid claims share a handful of causes. Workers wait too long to report the injury or to see a doctor, which weakens the causal link. Medical certificates are vague or no longer renewed, so the CNESST concludes that the worker can return to work. A consolidation date is set, benefits are cut, and the worker does not contest in time. Or the CNESST orders a return to a job the worker cannot physically do, and the disagreement is never formally challenged.
None of these are exotic legal problems. They are paperwork and timing problems, which is why they are so preventable. Keep copies of everything, renew your medical documents, read every CNESST decision as soon as it arrives, and treat each one as a deadline rather than a formality.
When to bring in a lawyer
Plenty of straightforward claims never need one. But certain signals are worth taking seriously: a denied or terminated claim, a dispute over whether your condition is work-related, a permanent impairment that has been undervalued, a forced return to work you do not think is safe, or an employer and insurer who are clearly contesting your file. At that point, the process stops being administrative and becomes adversarial.
This is the stage where experienced CNESST lawyers earn their place: assembling medical evidence, meeting review and tribunal deadlines, and arguing the causal link before the Tribunal administratif du travail. Many work on a contingency basis, so it is worth at least understanding your options before a deadline forecloses them.
Frequently asked questions
Does the CNESST cover me if the accident was partly my fault?
Generally yes. Quebec’s workplace injury scheme is a no-fault system, so you do not have to prove your employer was negligent, and ordinary carelessness on your part does not bar a claim. Compensation is about the injury and its link to your work, not about blame.
How much does income replacement pay?
As a rule, 90 percent of your net income is subject to a maximum insurable earnings ceiling that the CNESST sets each year. Your employer usually covers the first 14 days at that rate, and the CNESST pays afterward for as long as you are unable to work because of the injury.
What is the deadline to contest a CNESST decision?
You have 30 days from the date you receive the decision to request an administrative review, and 60 days from the review decision to contest it before the Tribunal administratif du travail. These deadlines are strict and start when you receive the decision, so act quickly.
Do I need to speak French to deal with the CNESST?
No. You can request services and submit documents in English, and you are entitled to be understood. That said, much of the correspondence arrives in French, which is one reason many anglophone workers seek help reading and responding to CNESST decisions.
What does a CNESST lawyer cost?
It varies, but many handle workplace injury files on a percentage or contingency basis, meaning fees are tied to what they recover. A first consultation is often free, which is the moment to ask how fees work before committing.
The bottom line
Quebec’s CNESST system is built to compensate injured workers, but it rewards those who know the rules and respect the clock. Report fast, document everything, read every decision the day it arrives, and challenge anything you disagree with before the 30 and 60-day windows close. Do that, and you give a legitimate claim its best chance of being paid in full.
This article is general information about Quebec’s workplace injury system, not legal advice. For guidance on your specific situation, consult a qualified lawyer.
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