Notice, not permission
WARN is easy to misread in two opposite directions. One mistake is treating it as a formality, a form to file on the way out the door. The other is treating it as a ban, as if a large layoff were somehow off limits. Neither is right. An employer can still close a site or cut a division. WARN does not ask why, and at the federal level it does not require severance. What it requires is time. A covered employer has to tell the people who are about to lose their jobs, and the public officials who will have to absorb that, at least 60 days before it happens.
That single idea drives everything else. Because the obligation is about lead time, the law cares a great deal about counting: how many people, at which site, over what window, and whether a series of smaller cuts adds up to a covered event. Get the count right and the rest is process. Get it wrong, or assume a quiet round of layoffs slides under the line, and the bill arrives as back pay for every worker who should have had notice.
Three thresholds that all have to line up
Federal WARN applies only when three separate questions come back yes: the employer is big enough, the event is large enough, and it happens at a single site within a tight window. Miss any one and the federal Act does not attach, though a state law still might. Start with the employer.
WARN covers employers with 100 or more employees, not counting those who work an average of fewer than 20 hours a week or who have been on the payroll fewer than 6 of the last 12 months. A second path also counts: 100 or more employees, part-timers included, who together work at least 4,000 hours a week, not counting overtime. Regular government entities sit outside the Act.
If the employer clears that bar, the next question is whether the event is a covered one. WARN recognizes two, and they are counted differently. The thread that ties them together is the idea of an employment loss, which is broader than a firing. It means a termination other than for cause, a quit, or a retirement; a layoff that runs longer than 6 months; or a cut of more than half of an employee’s hours in each month of a 6-month stretch.
Plant closing 50+ losses
The permanent or temporary shutdown of a single site, or of one or more facilities or operating units within it, that causes an employment loss for 50 or more employees during any 30-day period. Part-time workers are not counted toward the 50.
Mass layoff 50 at 33%, or 500
A reduction in force that is not a plant closing and causes an employment loss at a single site during any 30-day period for 50 to 499 employees who make up at least a third of the active workforce, or for 500 or more employees regardless of the percentage.
Two details quietly decide a lot of cases. The first is the single site of employment. WARN counts losses at one location, not across an entire company, so a cut spread thin across many offices may never trip the threshold at any one of them, while a state like New Jersey now treats the whole state as one establishment. The second is the 30-day window, which is where the next rule comes in.
The 90-day aggregation rule
The obvious way to dodge a notice law is to break one large layoff into several small ones, each below the trigger. WARN closes that door. If an employer has two or more groups of employment losses within any 90-day period, and each group on its own falls short of the threshold, the law adds them together and treats them as one covered event. The notice obligation then applies to the whole.
The only way out is proof. An employer that wants the rounds treated separately has to show the losses came from separate and distinct business actions and causes, not from one decision sliced into pieces. Absent that showing, a string of layoffs inside a 90-day window counts as a single mass layoff or closing.
This is why staggered reductions have to be planned against the calendar, not just the headcount. A cut of 30 in March and another 30 in May, at the same site and from the same restructuring, will usually be read as one event of 60, with notice owed to everyone.
What a missed notice costs
WARN has no government enforcer. The Department of Labor administers the regulations but does not investigate complaints or sue on a worker’s behalf. Enforcement runs through the federal courts, where affected employees, their representatives, and units of local government can bring suit. The remedies are spelled out, and they are the only ones the Act provides.
Back pay to employees Up to 60 days
An employer that violates the notice rule owes each affected worker back pay and the value of lost benefits for each day of the violation, up to a maximum of 60 days, or one-half the days the person was employed, whichever is smaller. The daily rate is the higher of the worker’s average pay over the last 3 years or final rate.
A penalty to local government $500 a day
An employer that fails to notify the unit of local government can owe a civil penalty of up to $500 for each day of the violation. That penalty disappears if the employer pays each affected employee what it owes within 3 weeks of the closing or layoff.
Liability can be trimmed. Wages and benefits the employer pays during the violation period, and voluntary payments it was not otherwise required to make, reduce the back-pay figure. A court may also award the prevailing party reasonable attorney’s fees, which cuts both ways. The practical point holds either way: the cost of giving notice is almost always smaller than the cost of a class of former employees suing for 60 days of pay.
Mini-WARN laws where the floor stops mattering
Federal WARN is a floor, and in the states that have built on it the floor is often the least of an employer’s worries. These mini-WARN laws tend to reach smaller employers, count employees more broadly, demand a longer notice, or add their own penalties. A reduction that is comfortably under the federal line can be squarely inside a state one. Four states show the range, and New Jersey shows how far it can go.
California 75 employees, 60 days
Cal-WARN covers an establishment that has employed 75 or more people in the past year and requires 60 days of notice for a mass layoff of 50 or more at a site, a termination, or a relocation of 100 or more miles. There is no one-third test, so 50 losses can trigger it on their own.
Illinois 75 employees, 60 days
Illinois WARN reaches employers with 75 or more full-time employees. Notice runs 60 days. A mass layoff is 250 losses, or 25 that make up at least a third of the site; a closing is 50 losses. The lower headcount pulls in mid-size employers the federal Act misses.
New York 50 employees, 90 days
New York covers private employers with 50 or more full-time employees and requires 90 days of notice, a month longer than federal. The triggers drop too: a closing or mass layoff affecting 25 employees can be enough, and the list of officials who must be told is long.
New Jersey Severance, no release
New Jersey covers employers with 100 or more employees statewide, requires 90 days of notice, and counts a mass layoff at 50 losses across the whole state with no one-third test. Its standout rule is severance, below.
New Jersey requires severance you cannot condition on a release. Since the 2023 amendments to its WARN law, New Jersey requires an employer to pay every terminated employee one week of pay for each full year of service, automatically, whether or not the 90-day notice was given. The employer cannot make that severance contingent on the worker signing a release of claims, and the worker cannot waive it without state or court approval. If the full 90 days of notice is not given, the employee is owed an additional four weeks of pay. This breaks the usual deal, in which severance buys a signed release, so a New Jersey reduction has to be priced and papered with that in mind.
These four are not the whole map. Washington added a mini-WARN in 2025, Maine and Maryland have their own versions, and other states are moving. The rules differ on the headcount that triggers them, the length of the notice, who has to be told, and whether any severance is owed, and they almost always run in addition to federal WARN rather than instead of it. When a state requires a longer notice than the federal 60 days, the federal period runs concurrently inside it, so meeting the stricter state deadline generally satisfies both. Before you rely on the federal floor, check whether a state law reaches your workforce, including remote employees based at an affected site.
Five ways employers trip the line
- Counting the wrong group.Federal WARN counts losses at a single site and excludes part-time workers from the trigger, while several states count differently and New Jersey counts the entire state as one establishment. Using the federal method where a state law applies is the most common way an employer concludes, wrongly, that it is under the line.
- Slicing one layoff into pieces.Two or more rounds inside a 90-day period add together unless the employer can show separate and distinct causes. A restructuring carried out in waves is still one event, and notice is owed to everyone in it.
- Paying 60 days instead of giving notice.Federal WARN has no pay-in-place-of-notice option. Writing checks for 60 days does not satisfy the notice requirement; it only reduces the back pay a court might award. The notice itself, in writing, to every required party, is the obligation.
- Tying New Jersey severance to a release.The statutory severance in New Jersey is automatic and cannot be conditioned on a signed release. An employer that withholds it until the worker signs, or folds it into a release agreement as if it were ordinary severance, is violating the law and may still owe a separate payment to settle other claims.
- Leaning on an exception too soon.The faltering company, unforeseeable circumstances, and natural disaster exceptions reduce the notice period; they do not remove it. The employer still has to give as much notice as it can and explain in writing why it fell short, and it carries the burden of proving the exception applies.
Pause before you run a reduction near these numbers. WARN turns on counts and dates that are easy to get wrong, and the federal floor is only the start. If a layoff or closing is anywhere close to a federal or state threshold, have employment counsel confirm the headcount, the single-site question, the 90-day aggregation, the right notice period, and every party that must be told, before any date is set or any employee is told. Counsel should also review any separation or release agreement, since a release cannot be conditioned on New Jersey’s statutory severance, and releases for workers 40 and over carry their own rules under the older-worker law. The figures here are general estimates of how these laws work, not legal or tax advice, and they change. The cost of a review is small next to a class action for 60 or 90 days of pay.
Where these rules come from
Primary sources
- U.S. Department of Labor, Plant Closings and Layoffs (WARN). The agency overview of the federal Worker Adjustment and Retraining Notification Act: coverage at 100 or more employees, 60 calendar days of notice, and a covered event affecting 50 or more workers at a single site. WARN is codified at 29 U.S.C. 2101 and following, with regulations at 20 CFR Part 639 administered by the Employment and Training Administration. dol.gov, Plant Closings and LayoffsChecked 2 June 2026
- Electronic Code of Federal Regulations, 20 CFR Part 639 (Worker Adjustment and Retraining Notification). The federal WARN regulations: who must give notice, who must receive it (affected employees or their representatives, the state dislocated worker unit, and the chief elected local official), the employment-loss definitions, the exceptions, and the rule that enforcement runs through the courts because the Department of Labor has no enforcement standing. ecfr.gov, 20 CFR Part 639Checked 2 June 2026
- U.S. Department of Labor, elaws WARN Advisor. The DOL compliance advisor confirming the back-pay remedy of up to 60 days, the civil penalty of up to $500 a day for failing to notify local government, the absence of any pay-in-place-of-notice option, and that the Department has no authority to investigate or enforce WARN. webapps.dol.gov, the WARN AdvisorChecked 2 June 2026
- California Department of Industrial Relations, Cal-WARN Act. California’s WARN law at Labor Code sections 1400 to 1408: a covered establishment of 75 or more persons, 60 days of notice for a mass layoff of 50 or more, a termination, or a relocation of 100 or more miles, with notice to the affected employees, the Employment Development Department, the local workforce board, and local officials. dir.ca.gov, the Cal-WARN ActChecked 2 June 2026
- New York State Department of Labor, Worker Adjustment and Retraining Notification (WARN). New York’s WARN law (Labor Law section 860 and following): private employers with 50 or more full-time employees, 90 days of notice, triggers reaching 25 affected employees, and an expanded list of officials and entities that must be notified. dol.ny.gov, the NYS WARN ActChecked 2 June 2026
- New Jersey Department of Labor and Workforce Development, File a WARN Notice. The state’s page for the Millville Dallas Airmotive Plant Job Loss Notification Act (N.J.S.A. 34:21-1 and following), reflecting the changes effective 10 April 2023: 90 days of notice, a mass-layoff trigger of 50 losses statewide, and mandatory severance of one week per year of service that cannot be conditioned on a release. nj.gov, File a WARN NoticeChecked 2 June 2026
- Illinois Department of Commerce and Economic Opportunity, Illinois WARN. The Illinois WARN Act (820 ILCS 65): employers with 75 or more full-time employees, 60 days of notice, a mass layoff of 250 or of 25 amounting to at least a third of the site, and a closing of 50, with back pay up to 60 days and a civil penalty of up to $500 a day. dceo.illinois.gov, Illinois WARNChecked 2 June 2026
The federal WARN Act is the floor. Many states run their own mini-WARN laws that reach smaller employers, require a longer notice, add severance, or count employees differently, and the set of those states keeps growing. Thresholds, notice periods, and penalties change as legislatures amend these laws. Confirm the federal rule and the law in every state where you have affected employees, including remote workers based at an affected site, before you act on this summary.
Tools that build on this
Plan a reduction you can defend and price it first
RIF / Restructure Planning Kit. The lawful-execution layer for a reduction. It includes a WARN screen that reads the federal thresholds and counts back the 60-day deadline, a selection scorer, a four-fifths adverse-impact review, an older-worker group-disclosure builder for releases, and a separation tracker, with a field guide that walks the WARN family and the New Jersey severance rule. Find it at truestephr.com.
RIF and Restructuring Savings Planner. The money model behind the decision. It estimates severance, the fully loaded cost of each role, the net savings, and the payback period, so the financial case is built and stress-tested before any headcount is set. Find it at truestephr.com.
Common questions
No. WARN is a notice law, not a just-cause law. A covered employer has to give 60 days of written warning before a covered closing or mass layoff, but it does not have to explain or justify the business decision, prove the layoff was necessary, or offer affected workers another role. The notice itself, delivered on time to the right parties, is the requirement.
Not under federal WARN, which makes no provision for pay in place of notice. An employer that pays without giving the written notice has still failed to comply; the payment only reduces the back pay a court could award for the missed notice. Some employers do choose to pay along with a shortened notice when an exception applies, but that is a way of limiting liability, not a substitute for the notice the Act requires.
Maybe not. Federal WARN starts at 100 employees, but several states set the bar lower. Illinois reaches employers with 75 full-time employees, New York reaches 50, and other states have their own thresholds, often with longer notice periods. A company that is too small for federal WARN can still owe notice, and in New Jersey severance, under a state law. Check the rule in every state where you have affected workers.
Federal WARN does not require severance. The only money it provides is back pay as a remedy when an employer fails to give the required notice. New Jersey is the exception: its state WARN law requires one week of pay for each full year of service, paid automatically and not conditioned on signing a release. Outside New Jersey, any severance usually comes from an employer’s own policy or a separate agreement, not from WARN.