Can Your Employer Demand a Doctor’s Note When You’re Sick?

You call in sick. The supervisor says bring a note. The lunchroom says they cannot ask anymore. Both of those people might be wrong.

For unionized workers in Ontario it is not a slogan. It is three documents stacked on top of each other: the collective agreement, the Employment Standards Act, and — if this is more than a cold — the Human Rights Code. Which one is doing the work depends on how long you are off, whether the days are paid, and what your book actually says.

Start with the book

A lot of agreements have their own sick-leave article. Paid days. How you report an absence. When a note is required. When it is not. Attendance programs. Short-term disability. Return-to-work medicals. If the agreement gives you paid sick time and sets the paperwork, that language is the first stop. Do not argue the statute until you have read the article. The steward reads both.

What the ESA actually changed

Ontario’s Employment Standards Act gives most employees three unpaid, job-protected sick days per calendar year (after two consecutive weeks on the job). As of October 28, 2024, an employer cannot demand a medical certificate from a physician, registered nurse, or psychologist as proof for those ESA sick days.

They can still ask for evidence that is reasonable in the circumstances. That is not the same as a doctor’s note. A short written statement from you can be enough. A walk-in clinic receipt is not the legal test.

When a note is still in play

A note for one ESA day is one fight. These are different fights:

• A longer absence than the statutory three days.
• Paid sick leave under the agreement, if the article requires documentation.
• Short-term or long-term disability claims.
• A return-to-work clearance after a serious illness or injury.
• The duty to accommodate — restrictions, not a diagnosis. Accommodation is not a favour.

They do not get your diagnosis. They get what they need to run the leave or the accommodation: off work until this date, these restrictions, this review date. If HR is fishing for a condition, that is a different problem. Call the steward.

Attendance programs are not a loophole — or a blank cheque

Some employers run attendance management. Points. Letters. “You are in the program.” A program does not beat the agreement. It does not beat the Code. It also does not mean every absence is protected. Patterns, no-calls, and fake notes still get people into discipline. Just cause still has to be proven. If they start building a case, get the union in the room.

What you do when they ask

• Read the sick-leave article and the attendance language.
• Ask whether they want an ESA day, a paid sick day, or a medical for return to work. Those are not the same request.
• Do not invent a diagnosis on a form.
• Do not ignore the request and hope. If the note is improper, the union can say so. Silence plus a missed shift is how letters get written. Refusing the wrong thing, the wrong way, is how a sick day turns into insubordination.
• Keep a copy of what you gave them and the date they asked.

So: can your employer demand a doctor’s note when you call in sick? Sometimes no — not for the three ESA days, and not as a reflex for every cough. Sometimes yes — because the agreement, the length of the absence, disability benefits, or a return-to-work plan puts medical evidence on the table. Do not take legal advice from the group chat. Open the sick-leave article. Then talk to the union.