Can your employer force you to work overtime on short notice? Under federal law, usually yes: the FLSA does not limit how many hours an adult can be required to work. It only says what you must be paid. The limits come from state laws for specific jobs, federal safety rules for specific industries, and union contracts.
Federal baseline: you can be required to work, and must be paid
The Fair Labor Standards Act sets no cap on weekly hours for employees aged 16 and over. Non-exempt employees must receive at least 1.5 times their regular rate for hours over 40 in a workweek. Refusing a lawful overtime assignment can lead to discipline unless a statute or a union contract protects you.
Who has limits on mandatory overtime
| Group | Limit | Where it comes from |
|---|---|---|
| Nurses and some other healthcare staff | Roughly 18 states restrict mandatory overtime for nurses, almost always with an emergency exception | State law. See the state-by-state nurse guide |
| Truck drivers (property-carrying, interstate) | 11 hours of driving after 10 consecutive hours off duty, a 14-hour on-duty window, a 30-minute break after 8 hours of driving, 60/70 hours in 7/8 days | FMCSA hours-of-service rules, 49 CFR Part 395 |
| Nuclear plant personnel under fitness-for-duty rules | 16 work hours in 24, 26 in 48 and 72 in 7 days; breaks of at least 10 hours between work periods (8 in some shift transitions) and 34 hours in any 9 days; waivers are possible in defined cases | NRC, 10 CFR 26.205 |
| Train employees | 12 consecutive hours on duty, then at least 10 hours off | Hours of Service Act, 49 U.S.C. chapter 211 |
| Union and public-sector employees | Contracts often set overtime rotations, notice periods and maximum hours | Your collective bargaining agreement |
A caution for drivers: the 11-hour limit caps driving time, not pay. Many interstate drivers of vehicles over 10,000 pounds are exempt from FLSA overtime under the Motor Carrier Act exemption (they still get minimum wage), so extra hours do not automatically raise their pay. Check your pay terms.
Daily overtime is a different question
A few jurisdictions pay overtime by the day, not just the week: California, Alaska, Nevada (below a wage cutoff), Colorado, Oregon manufacturing, and Puerto Rico. That changes what mandatory hours pay, not whether you can be required to work them. The thresholds are in our guide to states with daily overtime laws.
If you are being mandated
- Check whether a statute or your union contract covers your job before you refuse.
- Get the order in writing, or write down who ordered it, when, and why.
- Confirm the overtime is paid at the right rate. Shift differentials belong in the regular rate (29 CFR 778.207), so your overtime rate can be higher than 1.5 times base pay.
- Questions or complaints go to your HR department, your union, your state labor department, or the U.S. Department of Labor Wage and Hour Division.