What Is the WARN Act? Triggers, Notice, and Penalties

The Worker Adjustment and Retraining Notification Act, known as the WARN Act, is a federal law that requires large employers to give at least 60 days’ written notice before a plant closing or mass layoff.¹ Codified at 29 U.S.C. §§ 2101–2109, it gives affected workers time to find new jobs or enroll in retraining, and it alerts state and local governments so they can mobilize unemployment services. An employer that skips the notice owes back pay for each day it fell short of the 60-day window.

Which Employers Have to Give Notice

Coverage turns on size. A business is covered if it has at least 100 full-time employees, not counting part-time workers. It is also covered if it employs 100 or more workers, part-timers included, who together log at least 4,000 hours per week excluding overtime.² Both for-profit and nonprofit organizations can qualify. Smaller employers are exempt.

“Part-time” has a specific meaning under the regulations. It’s someone who averages fewer than 20 hours per week, or someone who has worked fewer than 6 of the 12 months before the date notice would have been required.³ A recent hire working 40 hours a week can still be “part-time” for WARN purposes.

Government entities that provide public services are not covered, including federal, state, and local agencies and federally recognized Indian Tribal governments.⁴ Quasi-public entities that operate as a business and maintain a separate identity from the government can still be covered, because the statute reaches any “business enterprise.”

What Triggers the 60-Day Notice

Two kinds of workforce reductions trigger the law: plant closings and mass layoffs. Both have numerical thresholds, and part-time workers are excluded from those thresholds.

Plant Closings

A plant closing happens when an employer permanently or temporarily shuts down a single employment site, or one or more facilities within a site, and the shutdown causes 50 or more full-time employees to lose their jobs during any 30-day period.² A temporary shutdown still counts if the job losses hit that threshold.

Mass Layoffs

A mass layoff is a reduction in force at a single site that is not itself a plant closing but still causes significant job losses during any 30-day period. It’s met one of two ways:

At least 33 percent of the full-time workforce and at least 50 full-time employees; or
500 or more full-time employees, regardless of what percentage that represents.

Under the first prong, a company with 120 full-time workers that lays off 50 crosses the line (42 percent and at least 50). A company with 2,000 that lays off 200 does not (only 10 percent). The 500-employee prong is a backstop so that very large layoffs always require notice.²

What Counts as Losing a Job

An “employment loss” means a termination other than a firing for cause, a voluntary quit, or retirement; a layoff lasting longer than six months; or a reduction in work hours of more than 50 percent each month over any six-month period. The six-month rule catches employers who frame a permanent layoff as “temporary” to avoid the notice duty.

The 90-Day Aggregation Rule

Employers can’t split layoffs into smaller rounds to duck notice. If separate rounds at a single site each fall below the thresholds but together exceed them within any 90-day period, the WARN Act treats them as one event.¹ The only escape is to prove the rounds resulted from separate and distinct causes, and that’s a high bar.

Who Gets Notice and What It Says

At least 60 calendar days before the first separation, the employer must deliver written notice to three groups: the affected employees (or their union representative, if one exists), the state’s dislocated worker unit, and the chief elected official of the local government where the closing or layoff will occur.¹ If the site sits across multiple local jurisdictions, notice goes to whichever received the highest employer tax payments the prior year.

Notice to individual (non-union) employees must state whether the action is permanent or temporary and whether the whole plant is closing, the expected date the closing or layoff will begin and the expected date of that worker’s separation, whether any bumping rights exist under a collective bargaining agreement or company policy, and the name and phone number of a company official who can answer questions. The notice must be in language the employees can understand.⁵

Notices to union representatives must also list the job titles of affected positions and the names of workers holding them. Notices to state and local officials must include job titles, the number of affected workers in each classification, and the names of any unions representing affected employees.

The regulations let an employer state either a specific date or a 14-day window during which separations will occur. If a window is used, the 60-day clock runs from the first day of the window.⁵ Vague language like “sometime in Q3” doesn’t satisfy the requirement.

When Shorter Notice Is Allowed

Three narrow situations let an employer give less than 60 days’ notice. Even then, the employer must give as much notice as is practicable and include a written explanation for the shortfall.⁶

The faltering company exception applies only to plant closings, not mass layoffs, and courts read it narrowly. The employer must have been actively seeking capital or new business at the time 60-day notice would have been due, and must have reasonably believed in good faith that announcing the layoff would have scared off the financing or deal.⁷ Being in financial trouble is not enough by itself.

The unforeseeable business circumstances exception covers both plant closings and mass layoffs caused by events the employer could not reasonably have foreseen when the 60-day notice would have been due. The sudden cancellation of a major contract, an abrupt loss of a key client, or an unexpected economic shock can qualify. A slow decline visible for months does not. Courts ask what a reasonable employer in the same industry and position should have anticipated.

A natural disaster such as a flood, earthquake, or drought that directly causes the closing or layoff exempts the employer from notice entirely.⁶ Distant economic ripple effects don’t count; the disaster must directly cause the shutdown.

What Workers Are Owed When Notice Is Skipped

An employer that orders a plant closing or mass layoff without proper notice owes each affected employee back pay for every day of the violation. The rate is the higher of the employee’s average regular rate over the prior three years or their final regular rate. The employer also owes the cost of benefits that would have continued during the notice period, including health insurance premiums and pension contributions.⁸

Two caps apply. Total liability per employee tops out at 60 days, and it can never exceed half the number of days the employee actually worked for the employer. So a worker who was on the job for 80 days can recover at most 40 days of back pay, even if the employer gave zero notice.

Failing to notify the local government carries a separate civil penalty of up to $500 for each day of the violation. The employer can avoid that penalty by paying all affected employees their full back pay within three weeks of ordering the shutdown or layoff.⁸ Waiting 22 days kills that safe harbor.

How the Law Is Enforced

The Department of Labor publishes guidance and maintains a WARN Advisor tool, but it has no enforcement authority and does not investigate complaints.⁹ There is no administrative process. Workers, unions, and local government officials who believe the law was violated must file suit in federal district court.

Cases can be brought individually or on behalf of similarly situated workers, and the court has discretion to award reasonable attorney’s fees to the prevailing party.⁸ Because WARN claims often involve large groups of employees with identical facts, class-style litigation is common.

State Mini-WARN Laws

The federal WARN Act is a floor, not a ceiling. At least 13 states have their own versions with stricter requirements. Some lower the employer-coverage threshold to as few as 50 full-time employees. Others reduce the number of affected workers needed to trigger notice, and at least one state requires 90 days’ notice instead of 60. An employer that complies with the federal law may still violate a stricter state law, so anyone assessing a layoff needs to check both layers.

1
Office of the Law Revision Counsel. 29 USC 2102 – Notice Required Before Plant Closings and Mass Layoffs
2
Office of the Law Revision Counsel. 29 USC 2101 – Definitions; Exclusions From Definition of Loss of Employment
3
eCFR. 20 CFR 639.3 – Definitions
4
U.S. Department of Labor. Plant Closings and Layoffs
5
eCFR. 20 CFR 639.7 – What Must the Notice Contain
6
GovInfo. 29 USC Chapter 23 – Worker Adjustment and Retraining Notification
7
eCFR. 20 CFR 639.9 – When May Notice Be Given Less Than 60 Days in Advance
8
Office of the Law Revision Counsel. 29 USC 2104 – Administration and Enforcement of Requirements
9
U.S. Department of Labor. WARN Advisor – Frequently Asked Questions