WARN Act: Covered Employers, Notice Rules, and Exceptions

The Worker Adjustment and Retraining Notification Act, known as the WARN Act, requires most employers with 100 or more workers to give at least 60 calendar days of advance written notice before a plant closing or mass layoff. The WARN Act notice requirements protect affected employees, their unions, the state dislocated worker unit, and the local government where the site sits.¹ An employer that fails to comply can owe each affected worker up to 60 days of back pay and benefits, plus a civil penalty of up to $500 for every day the local government went unnotified.

Which Employers Have to Give Notice

The Act reaches any private business that employs either 100 or more full-time workers or 100 or more employees (including part-timers) who together work at least 4,000 hours per week, not counting overtime.² For-profit and nonprofit employers are both covered. A “part-time employee” under the Act averages fewer than 20 hours per week or has worked fewer than 6 of the 12 months before the date notice is required.

The statute uses the phrase “business enterprise,” which generally excludes federal, state, and local government employers performing traditional government functions. A publicly funded entity that operates commercially may still qualify. Headcount is measured as of the date notice would be required, so employers hovering near the 100-employee mark should track staffing before planning any reduction.

What Kind of Layoff Triggers Notice

Two workforce actions trigger WARN: a plant closing and a mass layoff. Both are measured in “employment losses,” which the statute defines as terminations (other than firings for cause, voluntary quits, or retirements), layoffs lasting more than six months, or cuts in working hours of more than 50 percent in each month of any six-month period.² A temporary schedule cut that stays under 50 percent does not count.

Plant Closings

A plant closing is the permanent or temporary shutdown of a single employment site, or of one or more facilities or operating units within a site, that produces 50 or more full-time employment losses during any 30-day period.² Part-time workers are not counted toward the 50. A shutdown does not have to be permanent to qualify.

Mass Layoffs

A mass layoff is a reduction that is not a plant closing and that hits one of two marks in any 30-day period: at least 50 full-time employees affected and those workers representing at least 33 percent of the full-time workforce at the site, or at least 500 full-time employees affected regardless of percentage.² The 33-percent test catches larger employers by surprise. A site with 200 full-time workers laying off 60 clears the 50-employee minimum but not the 33-percent threshold, so that action by itself is not a mass layoff.

The 90-Day Aggregation Rule

Splitting a layoff into smaller waves does not sidestep the Act. If two or more groups of employment losses at the same site each fall below 50 but together exceed 50 within any 90-day period, they are treated as a single event.¹ The only way out is to show the smaller actions had genuinely separate and distinct causes. The regulations tell employers to look 90 days forward and 90 days back from any planned action.³

Who Has to Receive the Notice

Three recipients get written notice: the affected workers or their union, the state dislocated worker unit, and the chief elected official of the local government where the site sits.¹ Union-represented workers are notified through the chief elected officer of the union. Non-union employees each receive their own copy. If the site straddles more than one local jurisdiction, notice goes to the government that received the highest tax payments from the employer in the previous year.

What the Notice Has to Say

The federal regulations set out required content:

The name and address of the employment site where the action will occur.
The expected date of the first separation and a schedule for any later separations.
Whether the closing or layoff is expected to be permanent or temporary.
A statement of whether bumping rights exist.
The name and phone number of a company official who can answer questions.⁴

A union notice should list the affected sites, the job titles being eliminated, and the number of workers in each title. A notice to a non-union employee should include that worker’s name, address, and job title. An incomplete notice risks being ruled invalid by a court.

Timing and Delivery

Notice has to be served at least 60 calendar days before the first employment loss.¹ The clock runs from receipt, not mailing. Acceptable methods include first-class mail, personal hand delivery, and inserting the notice into a pay envelope. Employers using the mail should add a few days for transit.

If the action gets pushed back by fewer than 60 days, the employer sends an updated notice as soon as possible, referencing the original, stating the new date or 14-day window, and explaining the delay.⁵ Keeping documented proof of every notice and its delivery date is the single most useful step an employer can take to defend against a later claim.

Exceptions Allowing Shorter Notice

Three exceptions let an employer give fewer than 60 days of notice. Even then, the employer must give as much notice as is practicable and include a brief written explanation of why the period was shortened.¹ The employer carries the burden of proof, and courts read all three exceptions narrowly.

Faltering Company

This one applies only to plant closings. The employer has to show that when 60-day notice would have been due, it was actively pursuing specific financing or business that had a realistic chance of success, that the money or business would have kept the facility open, and that it genuinely believed announcing the potential closure would have scared off the deal.⁶

Unforeseeable Business Circumstances

This exception covers both plant closings and mass layoffs caused by events a reasonable employer in the same industry could not have predicted when notice would have been due. The regulations point to a major client canceling a key contract, a strike at a critical supplier, or a sudden dramatic economic downturn.⁶ A slow decline in orders over months would not qualify.

Natural Disaster

When a plant closing or mass layoff is the direct result of a flood, earthquake, drought, storm, tsunami, or similar event, the employer may give notice after the fact if advance notice was impossible.⁶ The word “direct” matters. A disaster that damages a supplier and forces your facility to close weeks later is an indirect chain, and this exception would not fit; the unforeseeable business circumstances exception might.

Situations Fully Outside the Act

Two situations are exempt from WARN altogether. A shutdown of a facility that was understood from the start to be temporary requires no notice. A plant closing or mass layoff that amounts to a strike or lockout is also exempt, provided the lockout is not designed to duck the notice requirement.⁷ Permanently replacing economic strikers also does not trigger WARN.

Business sales sit outside the notice trigger in most cases. The seller owes notice for any covered action up to and including the sale date; the buyer owes notice for any covered action after that. The sale itself is not an employment loss so long as workers continue with the buyer.⁸

What an Employer Owes for Skipping Notice

An employer that orders a plant closing or mass layoff without proper notice owes each affected worker back pay for every day of the violation, at the higher of the worker’s average regular rate over the past three years or their final regular rate. The employer also has to cover the cost of benefits the worker would have received, including health insurance premiums.⁹

Liability is capped at 60 days of back pay and benefits per worker, and it can never exceed half the total days the employee actually worked for the employer. A worker with only 80 days of service could recover no more than 40 days of back pay. The bill is reduced by wages already paid during the violation period, by voluntary unconditional payments to the worker, and by payments the employer made to third parties like insurers or pension plans on the worker’s behalf.

A separate civil penalty of up to $500 per day applies for each day the local government went unnotified. That penalty is waived entirely if the employer pays every affected worker full back pay and benefits within three weeks of ordering the shutdown or layoff. Courts can also reduce penalties when an employer proves it acted in good faith and had reasonable grounds for believing its conduct was lawful.

How Workers Enforce the Act

WARN is enforced through private lawsuits in federal district court. The U.S. Department of Labor has no authority to investigate WARN complaints or bring enforcement actions on a worker’s behalf. Workers and unions have to file suit themselves. A court can award reasonable attorney’s fees to the prevailing party, which makes individual and class claims more practical to bring.¹⁰ Anyone who suspects a violation should talk to an employment attorney promptly.

State Mini-WARN Laws

About a dozen states have their own layoff notification laws, often called mini-WARN acts. Coverage thresholds are frequently lower than the federal 100-employee minimum, with some states reaching employers with as few as 25 workers. Notice periods range from 30 to 90 days depending on the state, and some states cover smaller layoffs that would not trip the federal statute. A few provisions are voluntary rather than mandatory. Where both laws apply, the employer has to meet whichever standard gives workers more protection.

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 639.5 – When Must Notice Be Given?
4
eCFR. 20 CFR 639.7 – What Must the Notice Contain?
5
eCFR. 20 CFR 639.10 – When May Notice Be Extended?
6
eCFR. 20 CFR 639.9 – When May Notice Be Given Less Than 60 Days in Advance?
7
Office of the Law Revision Counsel. 29 USC 2103 – Exemptions
8
U.S. Department of Labor. WARN Advisor – What Am I Responsible for if I Sell My Business?
9
Office of the Law Revision Counsel. 29 USC 2104 – Liability of Employer
10
U.S. Department of Labor. WARN Advisor – Frequently Asked Questions