Can You Appeal a WSIB Decision?

If WSIB has denied your claim, reduced your benefits, or made a decision you believe is wrong, you have the right to appeal. Many injured workers do not know this — or assume the appeal process is too complicated to navigate without giving up. It is not, and the consequences of not appealing a wrong decision can be significant.

Here is how the Ontario WSIB appeals process works.

Step One: The Objection

The first step after receiving an unfavorable WSIB decision is to file an objection with WSIB itself. You have six months from the date of the decision to file an objection, though acting as quickly as possible is always better, memories fade, medical records are harder to obtain with time, and the sooner you object, the sooner the process moves.

Your objection should clearly identify the decision you are challenging and the reasons you believe it is wrong. WSIB will assign an appeals resolution officer (ARO) to review the decision. The ARO can consider new evidence, including updated medical information, that was not before the original adjudicator.

The ARO process is internal to WSIB, you are asking WSIB to reconsider its own decision. This does not always result in a reversal, but it is a required step before you can proceed to an external appeal.

Step Two: The Workplace Safety and Insurance Appeals Tribunal

If the ARO does not resolve the dispute in your favour, you can appeal to the Workplace Safety and Insurance Appeals Tribunal (WSIAT). WSIAT is an independent adjudicative tribunal — it is not part of WSIB and is not bound by WSIB’s policies in the same way WSIB adjudicators are.

WSIAT hearings are more formal than the ARO process. You will have the opportunity to present evidence, call witnesses, make submissions, and respond to WSIB’s position. WSIAT has the power to overturn WSIB decisions, substitute its own findings, and order payment of benefits that WSIB denied.

WSIAT decisions are final on questions of fact, they cannot be appealed further on factual grounds, but can be judicially reviewed in limited circumstances.

Common Reasons for Successful Appeals

Many WSIB denials are not based on a careful weighing of the evidence, they result from gaps in the medical record, inadequate documentation of how the injury occurred, failure to connect a medical condition to the workplace injury, or errors in the application of WSIB policy.

Successful appeals often involve obtaining updated or additional medical opinions that address specific gaps in the record, locating witness evidence that corroborates the injured worker’s account, or identifying errors in how WSIB applied its own policies and operational guidelines.

This is why legal representation matters at the appeals stage. Knowing what evidence to gather, which policies apply, and how to frame the argument for an ARO or WSIAT panel is the difference between a successful appeal and a missed opportunity.

Timelines Matter

The six-month deadline to object to a WSIB decision is a hard deadline. Missing it does not automatically end your claim, late objections can sometimes be accepted in compelling circumstances, but it significantly complicates your situation. Similarly, there are deadlines for filing appeals with WSIAT after an ARO decision.

If you have received a WSIB decision you want to challenge, do not wait. The sooner you engage with the process, the better your position.

A Denial Is Not the End

Many of our most successful outcomes at Yombo Grossman Law have come on files that WSIB denied at the initial stage. The appeals process exists precisely because initial decisions are not always right. If you believe WSIB got it wrong, you have options, and pursuing them is worth it.

This article is for informational purposes only and does not constitute legal advice. Contact Yombo Grossman Law for a consultation.