The WARN Act: Covered Employers, Notice Rules, and Remedies

The Worker Adjustment and Retraining Notification Act, better known as the WARN Act, is a federal law that requires larger employers to give workers at least 60 days’ written notice before a plant closing or a mass layoff. It applies to businesses with 100 or more employees, and when an employer skips the notice, affected workers can sue for up to 60 days of back pay and benefits.

Which Employers Have to Comply

The law covers any business that meets one of two workforce tests. The first counts heads: 100 or more employees, not counting part-timers. The second captures companies that lean on part-time staff: 100 or more workers who together log at least 4,000 hours a week, excluding overtime.¹

A part-time employee, for these purposes, is someone who averages fewer than 20 hours a week or who has worked fewer than 6 of the past 12 months. The 100-employee count includes workers across all of a company’s domestic locations, so an employer can’t argue that each facility is a separate, smaller business.¹

Which Layoffs and Closings Trigger Notice

Two categories of workforce reductions trigger the 60-day obligation: plant closings and mass layoffs. They are measured separately, and each has its own thresholds.

Plant Closings

A plant closing happens when an employer shuts down a site, facility, or operating unit and the shutdown causes 50 or more full-time employees to lose their jobs within a 30-day period. The closure doesn’t have to be permanent; a temporary shutdown that meets the numbers still counts. Part-time workers are not counted toward the 50.¹

Mass Layoffs

A mass layoff is a large reduction in force that isn’t tied to a full shutdown. It triggers notice when, during any 30-day period at a single site, at least 50 full-time workers lose their jobs and those workers represent at least 33 percent of the full-time workforce at that site. The 33-percent test drops away if 500 or more employees are laid off; at that scale, notice is required no matter what share of the site is affected.¹

The 90-Day Aggregation Rule

Employers sometimes stagger layoffs in smaller batches to slip under the thresholds. The statute answers with an anti-evasion rule. If separate layoffs at the same site each fall below the trigger but together exceed it within any 90-day window, they are treated as a single event, unless the employer can prove the rounds resulted from genuinely distinct and unrelated business decisions.² Proving that requires documentation created at the time, not explanations assembled after a lawsuit lands.

What Counts as Losing Your Job

The Act reaches beyond outright terminations. Three types of workforce changes qualify as an “employment loss”:

An involuntary termination other than a firing for cause, a voluntary quit, or a retirement.
A layoff that lasts longer than six months, even if it was originally called temporary.
A reduction of more than 50 percent in an individual employee’s hours during each month of any six-month stretch.

The last two categories catch situations where employers keep people technically on the payroll while gutting their schedules. Hours cut from 40 to 15 per week for half a year is an employment loss under the statute, even without a formal separation.³

Not every change qualifies. If your employer relocates or consolidates operations and offers you a transfer to a site within reasonable commuting distance with no more than a six-month gap in work, that offer means you have not experienced an employment loss. The same rule applies to a transfer offer at a more distant site if you accept within 30 days.³

What the Notice Must Say and Who Gets It

A WARN notice is a written document with required contents, not a vague heads-up. Every version must name and address the affected site, state whether the action is expected to be permanent or temporary, list a company official who can answer questions, and give the expected date of the first separations. That date can be a specific day or a 14-day window during which layoffs are expected to begin, but the notice must go out at least 60 days before the first day of that window.⁴

Three sets of recipients must all receive notice. If a union or other bargaining representative speaks for the affected workers, the notice goes to that representative; otherwise, each affected employee must be notified individually. The employer must also notify the state’s rapid-response dislocated worker unit and the chief elected official of the local government where the site is located. If the site straddles multiple jurisdictions, the notice goes to the one where the employer paid the highest taxes in the prior year.²

When Employers Can Give Shorter Notice

Three statutory exceptions permit less than 60 days’ notice, but none of them eliminate the notice obligation itself except in the case of a natural disaster. Even when an exception applies, the employer must give as much notice as circumstances allow and include a brief written explanation of why the full 60 days wasn’t feasible.²

Faltering Company

This exception applies only to plant closings, not mass layoffs. An employer can shorten the notice if it was actively pursuing financing or new business that would have avoided or postponed the shutdown, and it reasonably believed in good faith that announcing the closing would have scared off the capital or deal it needed.² Courts scrutinize this defense closely; a vague hope of finding investors is not enough.

Unforeseeable Business Circumstances

This exception covers closings and mass layoffs caused by events the employer couldn’t reasonably have anticipated when the 60-day notice would have been due. The Department of Labor describes it as something sudden, dramatic, and outside the employer’s control.⁵ A major client unexpectedly canceling a contract could qualify. A slow decline in sales that management chose to ignore would not.

Natural Disaster

When a closing or layoff results directly from a natural disaster such as a flood, earthquake, storm, or drought, no advance notice is required. This is the only exception that can completely eliminate the obligation rather than just shortening it.⁶

Situations the Act Does Not Cover

Workers hired with a clear understanding that their job was tied to a specific project or temporary facility aren’t entitled to notice when that project ends. The temporary nature must have been established at hire, not asserted after the fact. Closings and layoffs caused by a strike or lockout are also exempt, so long as the lockout is not itself a scheme to dodge the notice requirement.⁷

When a business is sold, the notice obligation doesn’t disappear; it shifts. The seller is responsible for any closing or mass layoff up to and including the date the sale closes, and the buyer takes over the obligation the day after. Full-time employees of the seller on the effective date of the sale are treated as employees of the buyer immediately afterward, so the transition itself does not create an employment loss when the workforce is kept on.⁸

What Workers Can Recover

An employer that fails to give the required 60-day notice owes each affected worker back pay and benefits for every day of the violation. The daily rate is whichever is higher: the employee’s final regular rate or the average regular rate over the last three years on the job. The employer must also cover medical expenses the worker incurred during the violation period that would have been paid by the company’s health plan if employment had continued.⁹

Liability is capped at 60 days total, and it cannot exceed half the number of days the employee actually worked for the employer. So a worker employed for only 40 days could recover at most 20 days of back pay.⁹

Failing to notify local government carries a separate civil penalty of up to $500 per day. That penalty goes away if the employer pays every affected worker in full within three weeks of ordering the shutdown or layoff.⁹

How Workers Enforce the Law

The Department of Labor does not enforce the WARN Act. It publishes guidance and answers questions, but that guidance is not binding on courts. Enforcement happens entirely through private lawsuits filed in federal district court by affected employees or their representatives.¹⁰ Courts have discretion to award reasonable attorney fees to the prevailing party, which makes it more feasible for workers to bring claims even when individual damages are modest.¹¹

State Mini-WARN Laws

More than a dozen states have enacted their own versions of the WARN Act, often stricter than the federal rule. These “mini-WARN” statutes vary widely, but they commonly lower the employee threshold below 100, reduce the number of affected workers needed to trigger notice, or extend the notice period past 60 days. Some states require 90 days’ notice, and some apply to employers with as few as 50 full-time workers. Where a state’s law is stricter, that standard controls, so complying with the federal minimum alone may not be enough. Checking state and federal obligations before any significant layoff is the only way to avoid a gap.

1
Office of the Law Revision Counsel. 29 USC Ch. 23 – Worker Adjustment and Retraining Notification
2
Office of the Law Revision Counsel. 29 USC 2102 – Notice Required Before Plant Closings and Mass Layoffs
3
Office of the Law Revision Counsel. 29 USC 2101 – Definitions, Exclusions From Definition of Loss of Employment
4
eCFR. 20 CFR 639.7 – What Must the Notice Contain?
5
U.S. Department of Labor. WARN Advisor – Unforeseeable Business Circumstances
6
U.S. Department of Labor. WARN Advisor – Exceptions
7
Office of the Law Revision Counsel. 29 USC 2103 – Exemptions
8
U.S. Department of Labor. WARN Advisor – Sale of Business
9
Office of the Law Revision Counsel. 29 USC 2104 – Administration and Enforcement of Requirements
10
U.S. Department of Labor. Worker Adjustment and Retraining Notification Act Frequently Asked Questions
11
U.S. Department of Labor. WARN Advisor – Frequently Asked Questions