EI Sickness Benefits in Ontario: Medical Certificate and Application Steps

Last reviewed and updated: August 2026 by a licensed Canadian physician

A federal EI sickness-benefits guide for Ontario workers, including the medical certificate, application timing, ROEs, and Service Canada’s decision process.

EI Sickness Benefits: Medical Certificate and Application Steps in Ontario

Employment Insurance sickness benefits are a federal program, so the core medical-certificate and application process is the same across Canada. Service Canada says to apply as soon as possible after you stop working. If you wait more than four weeks after your last day of work, you may lose benefits. Do not wait for every document before submitting an application.

The Medical Certificate

Service Canada says you need a medical certificate signed by the treating medical professional. You can use Service Canada’s Medical Certificate for Employment Insurance Sickness Benefits form or the provider’s own form. When a provider uses their own form, Service Canada says it must be readable, show official letterhead or a stamp, identify you, give the start date and expected duration of incapacity if known, and include the provider’s signature.

You may be asked to submit the certificate with the application. If not, Service Canada says to keep it for six years in case it is requested later.

Apply Before Every Document Is Ready

Submit the online EI application promptly. Gather your employer information, Social Insurance Number, direct-deposit information, and Records of Employment. Electronic ROEs are sent directly to Service Canada; if you receive paper ROEs, ask for copies and provide them as soon as possible after applying. You may be able to upload a requested medical certificate through My Service Canada Account, mail it, or bring it to a Service Canada office.

Eligibility Is Decided by Service Canada

Service Canada asks whether you are unable to work for medical reasons, whether your weekly work earnings decreased by more than 40% for at least one week, and whether you have the required insured hours. The agency decides eligibility and benefit duration. A medical certificate supports the application; it does not guarantee approval.

MedLetter’s Scope

EI sickness benefits commonly concern an absence that extends beyond MedLetter’s short-term acute-illness documentation service. MedLetter does not provide EI medical certificates, disability, chronic-condition, mental-health, workplace-injury, surgical-recovery, or extended-absence documentation. For an EI certificate, consult the treating professional who is managing the condition and can complete the required federal form or equivalent certificate.

Frequently Asked Questions

Do I need a medical certificate for EI sickness benefits?

Service Canada says applicants need a certificate signed by the treating medical professional. You can ask them to complete the federal form or their own certificate with the required details.

Should I wait for the certificate before applying?

No. Service Canada says to complete the online application right away and send required documents after applying if needed.

Who decides whether I qualify?

Service Canada decides eligibility. Review the current federal criteria and apply promptly if you think you may qualify.

Sources: Service Canada: Apply for EI sickness benefits | Service Canada: EI sickness benefits qualification and medical certificate

Related: EI Sickness Benefits: Medical Certificate Guide | How to Submit a Sick Note to an Employer