The Worker Adjustment and Retraining Notification Act requires employers with 100 or more workers to give 60 calendar days' written notice before a plant closing or a mass layoff of 50 or more employees at a single site — but the law covers a narrower slice of layoffs, and enforces itself far more weakly, than most workers assume.
Passed in 1988, WARN was built on a simple premise: workers, local officials and state agencies do better with two months' warning than with none. It does not require severance. It does not require the company to keep the jobs. It requires a letter, sent early enough for a community to react.
What Triggers the 60-Day Notice?
WARN separates covered layoffs into two categories, both defined in the Department of Labor's implementing regulation. A plant closing is the shutdown of a single site, or a major part of it, that causes 50 or more employees to lose their jobs within any 30-day period. A mass layoff is a reduction that is not a full closing but still eliminates jobs for at least 33% of the active workforce and 50 or more employees — or 500 or more employees regardless of percentage — at one site within 30 days.
Both thresholds are counted at a single site of employment, not across a company's whole footprint, which is one reason a firm can shed jobs at several locations without any single layoff crossing the line.
Which Employers and Workers Are Covered?
The notice duty falls on employers with 100 or more employees, excluding part-time staff, or with 100 or more employees (including part-timers) who together work at least 4,000 hours a week. Part-time is defined as averaging fewer than 20 hours a week or having worked fewer than six of the prior twelve months. Covered employees include hourly and salaried staff as well as managers and supervisors.
Notice must reach three separate recipients: the affected workers or their union representative, the state's dislocated-worker unit, and the chief elected official of the local government where the site sits — the mechanism by which a mayor or county executive learns a plant is closing at the same moment, by law, that the workforce does. The notice itself is not a formality: the regulation requires it to state whether the action is expected to be permanent, the anticipated date of the first job loss, and whether affected workers have bumping rights, so recipients get planning information, not just an announcement.
| Trigger | Threshold | Measured over |
|---|---|---|
| Plant closing | 50+ job losses at one site | 30-day period |
| Mass layoff | 33% of active workforce and 50+, or 500+ regardless of share | 30-day period, one site |
What Happens When a Company Skips the Notice?
A company that fails to give the full 60 days owes each affected worker back pay and benefits for the period of the violation, capped at 60 days, reduced by any notice it did give and any voluntary payments already made. It separately owes a civil penalty of up to $500 for each day it failed to notify the local government — a penalty it can avoid entirely by paying the employee liability within three weeks of the closing or layoff.
Enforcement runs through the courts, not the agency. The Department of Labor's Employment and Training Administration administers WARN and publishes compliance guidance, but it has no authority to investigate violations or seek damages on workers' behalf; claims are brought as private lawsuits by workers, their representatives, or a local government unit in U.S. District Court.
What Lets a Company Notify Late?
The statute carves out three exceptions. A “faltering company” — one actively seeking capital or business that a full 60-day notice would have jeopardized — can shorten notice ahead of a plant closing, though not a mass layoff. “Unforeseeable business circumstances,” such as a sudden, unanticipated contract cancellation, can excuse late notice for either trigger. So can a natural disaster. In each case the employer must still give as much notice as practicable and explain, in writing, why full notice wasn't possible.
Does WARN Reach Every Layoff?
No. A company under the 100-employee threshold owes nothing under federal law, and a single-site layoff that stays below 50 people, or below the 33% mass-layoff share, triggers no notice regardless of the employer's total size. The Department of Labor notes that some states run their own plant-closing laws layered on top of the federal floor, often with lower employee counts or broader coverage — meaning the protection a laid-off worker actually gets can depend as much on the state as on the size of the layoff itself.
What the federal law guarantees, in the end, is lead time and a paper trail — 60 days for a workforce and a local government to plan, and a legal record if that window is cut short. It does not guarantee a job, a severance check, or that the company stays.
For a related impact perspective, read The 60-Day Rule: What the WARN Act Actually Requires Before a Mass Layoff.
For more context, read How a Federal Government Shutdown Actually Works.
For more context, read How an INTERPOL Red Notice Actually Works.
For more context, read Bid Protests: How the 100-Day Clock Actually Works.