Can Your Employer Force You to Work Overtime? What Unionized Workers Need to Know

If you have ever been told “you have to stay late,” you have probably asked: can my employer force me to work overtime? For unionized workers the answer is sometimes yes. It depends on your collective agreement, the circumstances, and the law that applies to your workplace. There is no universal rule that says the employer can always force it, or that you can always refuse it.

Check the collective agreement first

For a unionized worker, the book is one of the first places you look. Many agreements have specific language on overtime, mandatory overtime, how it is distributed, seniority, call-outs, scheduling, days off, shift extensions, refusing overtime, and overtime equalization.

The employer may have the right to require overtime if the agreement gives management that authority. That does not mean they can assign it however they want. Your book might require them to offer it by seniority, qualifications, rotation, availability, or an overtime list. The exact wording matters.

Can my employer make me work overtime?

If the agreement allows mandatory overtime, refusing a legitimate overtime assignment can land you in discipline. That does not mean every overtime order is automatically reasonable or enforceable. Ask:

• Does the collective agreement permit this overtime?
• Was it assigned the way the agreement says — rotation, seniority, the list?
• Are there limits on hours of work?
• Is there a safety issue? Fatigue is not a personality test.
• Is this an emergency, or just a supervisor who did not plan the crew?

What about overtime rights in Ontario?

Ontario’s Employment Standards Act sets a floor, not the ceiling. For most employees covered by the overtime rules, overtime pay starts after 44 hours in a work week, at at least 1.5 times the regular rate. There are exceptions and special rules for some jobs. The ESA also has rules on maximum hours and time free from work. In some emergencies, an employer can require extra hours inside those limits.

For a unionized worker, the statute is only part of the picture. Your collective agreement can give you more — a lower overtime trigger, better distribution rules, a right to refuse, a call-out premium. It can also let the employer require overtime the ESA would not have forced on a non-union shop in the same way. Read both. Guess neither.

Do not just say no — check first

If you are told you have to stay and you think the order breaks the agreement, do not assume walking out is the smart move. Call your steward as soon as you can. They look at the language, whether the employer followed the list, and what the right response is. In a lot of halls, the union files a grievance rather than having you refuse the order and collect a letter.

So: can my employer force me to work overtime? For a unionized worker it depends on the agreement, the employment standards that apply, the facts, and sometimes past practice. Do not rely on what a co-worker remembers from another plant. Open the book. The details are the difference between eating the extra hours and knowing whether they were allowed to assign them.