WSIB Claims and Sick Notes in Ontario: What Workers Need to Know (2026)

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

Workplace injury in Ontario? Understanding the difference between WSIB claims and regular sick notes can save you thousands in lost benefits.

Updated August 2026, Current Ontario ESA and CPSO telemedicine standards.

WSIB Claims vs. Sick Notes: Understanding the Difference

If you are injured at work in Ontario, you may be confused about whether you need a regular sick note or WSIB (Workplace Safety and Insurance Board) documentation. The answer matters, it determines whether you receive full wage replacement benefits or just your employer's standard sick leave. Making the wrong choice can cost you thousands of dollars in lost benefits and leave you without critical workplace protections.

Ontario sees over 200,000 workplace injury claims annually. Many workers, particularly those new to their jobs, working in construction, manufacturing, or healthcare, do not realize they are entitled to WSIB benefits until it is too late to file properly.

When to File a WSIB Claim vs. Using a Sick Note

| Situation | Use WSIB | Use Sick Note |
|---|---|---|
| Injury happened at work | Yes | |
| Repetitive strain from work tasks | Yes | |
| Illness caused by workplace exposure | Yes | |
| Personal illness unrelated to work | | Yes |
| Mental health from workplace harassment | Yes | |
| Pre-existing condition worsened by work | Yes (partially) | |
| Commuting accident | | Yes |
| COVID-19 caught at work | Yes | |
| Slip and fall on employer premises | Yes | |

WSIB Benefits vs. Sick Leave: Financial Comparison

WSIB provides:

  • 85% of net earnings (tax-free) from day one of lost time

  • Full healthcare coverage for the injury (physiotherapy, prescriptions, equipment)

  • Vocational rehabilitation if you cannot return to your previous role

  • No cap on duration (as long as medically necessary)

  • Re-employment obligation on your employer (20+ employees)

  • Labour Market Re-entry benefits if permanently impaired


Regular sick leave provides:
  • 3 unpaid days under ESA (or employer-provided paid days)

  • EI Sickness Benefits: 55% of earnings for up to 26 weeks (taxable)

  • No coverage for treatment costs beyond OHIP

  • No re-employment guarantee

  • No vocational rehabilitation


Example: A warehouse worker earning $55,000/year who breaks their wrist at work:
  • WSIB: approximately $750/week tax-free + all physiotherapy covered + job guaranteed

  • Sick note route: $0 for first 3 days, then EI at approximately $580/week taxable + pay for own physiotherapy


Medical Documentation Required for WSIB

Your treating physician must complete a Form 8 (Health Professional's Report) within the first few days of treatment. This form includes:

1. Diagnosis, What injury or condition was identified
2. Mechanism of injury, How the workplace caused or contributed to it
3. Functional abilities, What you can and cannot do physically
4. Treatment plan, Recommended care and timeline
5. Expected recovery, Estimated return-to-work date
6. Work restrictions, Specific limitations (no lifting over X kg, no standing over Y hours)

Common Mistakes That Delay or Deny WSIB Claims

1. Waiting too long to report, Report within 24 hours if possible. Delays raise suspicion.
2. Seeing a doctor who will not complete Form 8, Ensure your physician is willing to complete WSIB paperwork. Walk-in clinic doctors sometimes refuse.
3. Not mentioning it happened at work, Always tell your doctor the injury is work-related at your first visit. This gets documented in your medical record.
4. Using a sick note instead of filing WSIB, This costs you benefits and protections. Some employers encourage this to avoid premium increases.
5. Not keeping records, Document everything: incident reports, witness names, photos of the scene, and all communication with your employer.
6. Accepting employer pressure, Some employers discourage WSIB claims. This is illegal. You have the right to file regardless of employer preference.

When You Need Both WSIB and a Sick Note

Sometimes you need both:

  • Waiting for WSIB approval, Use sick leave while your claim is processed (typically 2-4 weeks)

  • Partial work-relatedness, Some conditions are partly work-related, partly personal

  • Denied WSIB claim, You will need a regular sick note while appealing

  • Modified duties period, Your employer may request a sick note for the non-WSIB portion of your recovery


WSIB Claim Timeline

| Step | Timeframe | Action Required |
|---|---|---|
| Injury occurs | Day 0 | Report to supervisor immediately |
| Seek medical treatment | Day 0-1 | Visit doctor or ER; mention it is work-related |
| Employer files Form 7 | Within 3 days | Employer's legal obligation |
| Doctor files Form 8 | Within 4 days | Your treating physician |
| You file Form 6 | Within 6 months | Worker's report (do not delay) |
| WSIB initial decision | 2-4 weeks | Approval or request for more info |
| Benefits begin | Retroactive to day 1 | If approved |

How MedLetter Can Help

While MedLetter cannot complete WSIB Form 8 (this requires your treating physician who examined the injury), we can help with:

  • Sick notes while waiting for WSIB approval, Do not go without documentation during the 2-4 week processing period

  • Return-to-work letters after your WSIB claim closes

  • Modified duties documentation for gradual return to full duties

  • Appeal support letters if your claim was denied and you need documentation while appealing


Frequently Asked Questions

Can I file a WSIB claim and use sick leave at the same time?
You can use sick leave while waiting for WSIB approval. Once WSIB benefits begin, they are retroactive, you may need to repay any employer sick pay received for the same period.

What if my employer pressures me not to file WSIB?
This is illegal. Employers cannot discourage, threaten, or penalize workers for filing WSIB claims. Document any pressure and report it to WSIB directly.

How long do I have to file a WSIB claim?
You should file within 6 months, but claims can be accepted up to 2 years after the injury in some circumstances. File as soon as possible, delays weaken your claim.

Can I choose my own doctor for WSIB?
Yes. You have the right to choose your own treating physician. Your employer cannot force you to see a specific doctor for initial treatment.

What if my WSIB claim is denied?
You can appeal to the WSIB Appeals Branch within 30 days, then to the Workplace Safety and Insurance Appeals Tribunal (WSIAT). Get legal advice, community legal clinics offer free WSIB appeal assistance.

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Sources: Ontario Employment Standards Act, 2000 (ESA, s.50), Ontario Human Rights Code (s.17), Accessibility for Ontarians with Disabilities Act (AODA). Last verified: August 2026.

Related Resources:

Ready to get your sick note? New sick-note requests are temporarily paused while we review our service. We are not accepting new orders at this time. — delivered same-day by a licensed Canadian physician.


Need a sick note in Ontario? MedLetter provides official physician-signed documentation for $49 with same-day delivery. No walk-in clinic visit needed — submit in 2 minutes, receive your note by email. Valid for employers, universities, and insurance across Ontario.


Need a Sick Note After Hours?


It's 10 PM and you just realized you need a doctor's note for tomorrow morning. Walk-in clinics are closed. Your family doctor's office doesn't open until 9 AM — by then you're already late for work. MedLetter accepts requests 24/7, including evenings, weekends, and holidays. Submit at midnight, receive your note before your shift starts. New sick-note requests are temporarily paused while we review our service. We are not accepting new orders at this time..


Also known as: doctor's note, medical certificate, absence note, fitness-to-work letter, or medical documentation for employer. MedLetter provides all of these — same document, same $49 flat fee, same-day delivery.

Labour Day Weekend 2026


Getting sick over the Labour Day long weekend (August 30 - September 1, 2026) means every clinic is closed for 3 days. If you need a sick note for Tuesday September 2nd, MedLetter is your only option for same-day documentation. We're available all weekend — submit your request Saturday, Sunday, or Monday and receive your note before you're due back at work.


GTA Commuters


If you commute on the GO Train from Oshawa, Barrie, or Hamilton to Union Station, taking a sick day means losing a full day just to get a doctor's note. MedLetter eliminates that problem — submit from your couch, get your note by email, and forward it to HR before your shift would have started. Works for TTC, MiWay, YRT, and Durham Transit riders too.

Called in Sick and Your Boss Wants a Doctor's Note?


Don't panic. If you called in sick and need a doctors note, MedLetter can help right now. Many Canadians find themselves in this exact situation — you woke up feeling terrible, called your boss, and now they want proof. You don't need to drag yourself to a walk-in clinic while sick. Submit your request in 2 minutes from bed, and a licensed physician will review your case and deliver your official sick note by email the same day. Boss wants a sick note? What do I do? — start here: New sick-note requests are temporarily paused while we review our service. We are not accepting new orders at this time..

Need a sick note in Ontario? MedLetter provides official physician-signed documentation for $49 with same-day delivery. No walk-in clinic visit needed — submit in 2 minutes, receive your note by email. Valid for employers, universities, and insurance across Ontario.

Conditions We Cover


MedLetter provides sick notes for all common short-term illnesses: cold and flu (fever, sore throat, congestion), food poisoning (nausea, vomiting, diarrhea from contaminated food), stomach bug / gastroenteritis (viral stomach illness), headache and migraine (severe enough to miss work), minor back pain or muscle strain (tweaked back, pulled muscle), and general malaise (feeling too unwell to work safely). If your illness is short-term (1-5 days) and you are genuinely sick, we can help.

Need a sick note in Ontario? MedLetter provides official physician-signed documentation for $49 with same-day delivery. No walk-in clinic visit needed — submit your request in 2 minutes and receive your note by email. Valid for employers, universities, and insurance across Ontario.

Need a sick note in Ontario? MedLetter provides official physician-signed documentation for $49 with same-day delivery. No walk-in clinic visit needed — submit your request in 2 minutes and receive your note by email. Valid for employers, universities, and insurance across Ontario.