How Long Is Sick Note Valid Ontario | Expiry & Duration

Does your Ontario sick note expire? Here's everything you need to know about validity periods and when you need a new note.

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

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.

How Long Is a Sick Note Valid in Ontario?

A sick note in Ontario is valid for the specific dates stated on the document. There is no universal "expiry date", the validity depends entirely on what the physician wrote. This guide explains every scenario.

Key Rules About Sick Note Duration

Rule 1: The Note Covers Specific Dates Only

A sick note that says "unable to work from May 1-3" is valid only for those dates. It does not provide blanket coverage for future absences. If you need additional time off beyond the stated dates, you need a new note.

Rule 2: No Legal Maximum Duration

There is no legal maximum for how long a sick note can cover in Ontario. A physician can write a note for:

1 day (common cold, migraine)

3-5 days (flu, minor surgery recovery)

1-2 weeks (moderate illness, injury)

1-3 months (serious condition, post-surgery)

6+ months (chronic condition, major surgery)

"Until further notice" (open-ended for serious conditions)

The duration must be clinically appropriate for the condition. A physician won't write a 3-month note for a common cold, but they will for post-surgical recovery.

Rule 3: Retroactive Notes Are Valid

A physician can issue a note for dates that have already passed (retroactive). For example:

You were sick Monday-Wednesday but couldn't see a doctor until Thursday

The note can cover Monday-Wednesday retroactively

This is standard medical practice and fully accepted by employers

MedLetter can issue retroactive notes for recent absences (typically within the past 7 days).

Rule 4: Open-Ended Notes

For ongoing conditions, a physician may write:

"Unable to work until further medical clearance"

"Unable to work for an indefinite period pending treatment"

"Return to work date to be determined"

These are valid but may require periodic updates (see below).

When Do You Need a New Sick Note?

| Situation | New Note Needed? | Details |
|-----------|-----------------|---------|
| Absence extends beyond original dates | Yes | Get extension note |
| Employer policy requires weekly updates | Yes | For extended absences |
| New, separate illness | Yes | Different condition |
| Return-to-work date changes | Yes | Updated note |
| Returning to work | Maybe | Fitness-for-duty may be required |
| Same illness, same dates | No | Original note sufficient |
| Employer "lost" your note | No | Provide copy |

Can an Employer Require Ongoing Notes?

Yes, for extended absences, employers can reasonably request:

| Request | Reasonable? | Typical Frequency |
|---------|-------------|-------------------|
| Weekly updates (first month) | Yes | Every 7 days |
| Bi-weekly updates (months 2-3) | Yes | Every 14 days |
| Monthly updates (3+ months) | Yes | Every 30 days |
| Daily updates | No | Unreasonable burden |
| Multiple notes per week | No | Unreasonable |
| Return-to-work clearance | Yes | Before returning |
| Functional abilities form | Yes | For accommodation planning |

Key principle: Requests must be "reasonable in the circumstances." What's reasonable for a 2-day absence differs from what's reasonable for a 3-month absence.

The Interaction with Benefits Programs

Different programs have different documentation timelines:

| Program | Initial Documentation | Ongoing Requirements |
|---------|----------------------|---------------------|
| ESA sick days (3 days) | None required | None |
| Employer sick leave | Per company policy | Varies |
| Short-term disability | At application | Monthly updates typical |
| EI Sickness Benefits | At application | May request updates |
| Long-term disability | At application | Quarterly updates typical |
| WSIB | Form 8 immediately | Progress reports |

Common Scenarios and Solutions

Scenario 1: Your 3-day note runs out but you're still sick

Solution: Get a new note extending your absence

MedLetter can provide extension notes for $49

Scenario 2: You were sick last week but forgot to get a note

Solution: Get a retroactive note (within 7 days)

MedLetter can backdate notes to cover recent absences

Scenario 3: Your employer wants weekly notes for a month-long absence

Solution: This is reasonable for extended absences

MedLetter can provide weekly extension notes

Consider asking your employer to accept bi-weekly instead

Scenario 4: You have a chronic condition with recurring absences

Solution: Get a standing accommodation letter

This covers recurring absences without needing a new note each time

MedLetter can provide workplace accommodation letters

Scenario 5: Your note says "until further notice" but your employer wants a date

Solution: Provide an updated note with an estimated return date

Or explain that the open-ended note is clinically appropriate

MedLetter for Follow-Up and Extension Notes

If you need an extension or follow-up note, MedLetter can provide:

Extension notes for ongoing conditions ($49 per note)

Return-to-work clearance letters ($49)

Updated documentation for extended absences ($49)

Workplace accommodation letters for recurring conditions ($49)

Each note is reviewed by a CPSO-registered physician and delivered same day.

Ontario Employment Standards Context

Under Ontario's Employment Standards Act, 2000 (ESA):

Employers cannot require a doctor's note for ESA-protected sick days (Working for Workers Act, 2022)

The Ontario Human Rights Code requires employers to accommodate medical conditions to the point of undue hardship

Federally regulated employees in Ontario get 10 paid sick days under the Canada Labour Code

Requests for ongoing documentation must be "reasonable in the circumstances"

Tips for Managing Sick Note Duration

1. Ask your physician for realistic dates, Don't underestimate recovery time (you can always return early)
2. Get a note that covers your full expected absence, Avoids needing multiple notes
3. Keep copies of all notes, Digital and physical copies
4. Communicate with your employer, Let them know if you need to extend
5. Know your benefits, Transition to STD/EI if absence extends beyond employer sick leave
6. Consider accommodation, For chronic conditions, a standing letter may be better than repeated notes

Get Your Sick Note Now

Whether you need a first note, an extension, or a return-to-work clearance, MedLetter provides same-day documentation from CPSO-registered physicians.

New sick-note requests are temporarily paused while we review our service. We are not accepting new orders at this time.

$49 per note | CPSO-registered physician | Same-day delivery | Extensions available

Frequently Asked Questions

Does a sick note expire in Ontario?
A sick note is valid for the specific dates written on it. It doesn't "expire" in the traditional sense, it covers a defined period. After that period ends, you need a new note if you're still unable to work.

Can I get a sick note extended?
Yes. If your illness lasts longer than originally expected, a physician can issue an extension note covering additional dates. MedLetter provides extension notes for $49 with same-day delivery.

How far back can a sick note be dated?
A physician can issue a retroactive note for recent absences, typically within the past 7 days. The further back you go, the less clinically defensible the note becomes. Get documentation as soon as possible.

Can my employer require a new note every week?
For extended absences, weekly updates may be reasonable in the first month. However, requiring daily notes or multiple notes per week is generally considered unreasonable. If you believe the requests are excessive, consult the Ministry of Labour.

What if I return to work before my sick note ends?
You can return to work at any time before your note's end date. you should still consider getting a separate "return to work" note for early return unless your employer specifically requires fitness-for-duty clearance (common for safety-sensitive roles).

Can I use a sick note from another province?
Generally yes, if the physician is licensed in their province. However, Ontario employers (including Shopify, TD Bank, RBC, Amazon, Loblaws, and government agencies) may prefer notes from CPSO-registered physicians. For certainty, use an Ontario-licensed physician.

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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.

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