Ontario ESA Sick Note Rules: What the Employment Standards Act Actually Says
Ontario's sick leave rules are governed by the Employment Standards Act, 2000 (ESA) and its regulations. The ESA provides some of the strongest employee protections in Canada regarding sick notes — but many employers and employees do not fully understand them.
The Basic Framework: Sick Leave Under the ESA
Under Ontario's ESA, employees are entitled to:
- 3 paid sick days per year (Working for Workers Act, 2022 amendments)
- Additional unpaid sick days depending on employer size and policy
- No medical certificate required for ESA-protected sick days (critical!)
The most important rule: For the 3 paid sick days guaranteed under the ESA, employers cannot require a medical certificate. This is explicitly stated in the legislation.
The "No Sick Note" Rule Explained
Ontario's ESA, Section 50.1, states that employers may only require "evidence reasonable in the circumstances" for sick leave. The Ontario government has clarified that:
- A medical certificate is not required for ESA-protected sick days
- Employers can ask for "reasonable evidence" but this can be satisfied by a verbal or written statement from the employee
- The cost of any medical certificate cannot be imposed on the employee if the employer demands one beyond what is reasonable
However: Many employers still require sick notes through internal policies or employment contracts. While this may not align with the ESA's intent, enforcement depends on the specific circumstances.
What Employers CANNOT Do in Ontario
Ontario's ESA and Human Rights Code prohibit employers from:
1. Requiring a medical certificate for ESA-protected sick days (the 3 paid days)
2. Demanding disclosure of your diagnosis — only functional limitations
3. Refusing a legitimate medical certificate from any CPSO-registered practitioner
4. Retaliating against you for taking sick leave
5. Requiring you to find your own replacement before taking sick leave
6. Counting sick days against you in performance reviews (if properly documented)
7. Terminating employment for using ESA-protected leave
What Employers CAN Do
The ESA permits employers to:
1. Request "evidence reasonable in the circumstances" (but not necessarily a doctor's note)
2. Implement attendance management programs with reasonable thresholds
3. Require documentation for extended absences (beyond ESA minimums)
4. Set internal policies through employment contracts (but cannot override ESA minimums)
5. Require fitness-for-duty clearance after extended absences
6. Track attendance patterns and address chronic absenteeism
Unionized Workplaces in Ontario
Ontario's major unions have varying collective agreement provisions:
| Union | Typical Threshold | Common in |
|-------|------------------|-----------|
| OPSEU | 3+ days or pattern | Government, colleges |
| CUPE | Varies by local | Municipal, education, healthcare |
| ONA | 3+ shifts | Nurses |
| UNIFOR | Per employer policy | Manufacturing, auto, media |
| USW | 3+ days | Steel, mining, manufacturing |
| UFCW | 3+ days | Retail, food processing |
The Ontario Human Rights Code
The Ontario Human Rights Code adds significant protections:
- Disability (physical, mental, learning, addiction) is a protected ground
- Employers have a duty to accommodate up to undue hardship
- Disability-related absences cannot be used in progressive discipline
- Termination for disability-related absenteeism without accommodation = discrimination
- The Ontario Human Rights Tribunal can award significant damages
The WSIB vs. Sick Note Distinction
For Ontario workers, it is critical to distinguish:
- Work-related injury/illness goes to WSIB (Workplace Safety and Insurance Board)
- Non-work illness/injury uses a sick note / ESA sick leave
- Occupational disease goes to WSIB
- Mental health (work-caused) may qualify for WSIB
Never use a sick note for a work-related condition — you lose WSIB benefits (wage replacement, medical coverage, rehabilitation).
Filing a Complaint
If your Ontario employer violates the ESA:
1. Document the violation — save all communications
2. Contact the Ministry of Labour — 1-800-531-5551
3. File a complaint — within 2 years of the violation
4. Consider human rights complaint — Ontario Human Rights Tribunal (if discrimination)
Key Takeaway
Ontario's ESA is clear: for the 3 paid sick days, no medical certificate can be required. For absences beyond ESA minimums, employers can request "reasonable evidence" — which a note from any CPSO-registered physician (including online telehealth) satisfies. If your employer demands notes for every absence or refuses legitimate documentation, they may be violating the ESA.
Related: [Sick Note Ontario — Complete City Guide](/sick-note-ontario) | [Ontario Sick Note Cost 2026](/blog/ontario-sick-note-cost-2026)
Frequently Asked Questions
How many sick days do Ontario employees get?
Under the Employment Standards Act (ESA), most Ontario employees are entitled to 3 days of unpaid sick leave per calendar year after 2 consecutive weeks of employment.
Can my Ontario employer require a sick note?
Yes. Ontario employers can request a sick note as evidence of illness, though the ESA does not specify when this requirement kicks in.
Do I get paid sick days in Ontario?
The ESA provides 3 unpaid sick days. Paid sick days depend on your employer's policy or collective agreement.
Can my employer fire me for taking sick days in Ontario?
No. Taking ESA-protected sick leave cannot be grounds for termination. However, excessive absences beyond protected leave may be addressed through progressive discipline.