The WARN Act is one of the few federal statutes that imposes a substantive procedural requirement before a layoff: 60 days of advance written notice. The rule sounds simple. The application is full of edges. Whether your separation triggers WARN, whether your employer is covered, what counts as the "site of employment," and which exceptions apply all matter for your back-pay claim if your employer didn't give you the notice the statute required.

Which employers WARN covers

WARN applies to private-sector employers (and quasi-public entities operating in a commercial context) with 100 or more full-time employees, or 100 or more employees who in aggregate work at least 4,000 hours per week (excluding overtime). Federal, state, and local governments are not covered (29 U.S.C. § 2101(a)(1), Cornell Law, verified April 2026).

Two coverage tests matter when the headcount is close to the threshold:

The full-time test counts only employees who have worked at least 6 of the prior 12 months and average 20 or more hours per week.
The aggregate-hours test sums all hours worked by all employees, full-time and part-time, and asks whether the total exceeds 4,000 hours per week.

Either test triggers WARN coverage. Affiliated entities under common ownership and control are aggregated for the headcount calculation if they share a common business operation, common officers, or share workers. The DOL's employer's guide to advance notice lays out the test in detail, verified April 2026.

What counts as a covered plant closing or mass layoff

WARN distinguishes plant closings from mass layoffs. The numerical thresholds differ.

A "plant closing" is the permanent or temporary shutdown of a single site of employment, or one or more facilities or operating units within a single site, that results in employment loss for 50 or more full-time employees during any 30-day period.

A "mass layoff" is a reduction in force at a single site of employment that results in employment loss during any 30-day period for at least 500 full-time employees, OR for 50 to 499 full-time employees who together constitute at least 33% of the active full-time workforce at the single site of employment (29 U.S.C. § 2101(a)(2)-(3), Cornell Law, verified April 2026).

"Employment loss" means termination, layoff exceeding 6 months, or a 50%+ reduction in hours for each month of any 6-month period. Voluntary resignation, retirement, and discharge for cause are not employment losses (29 CFR § 639.3(f), verified April 2026).

The "30-day period" is critical: an employer cannot avoid WARN by spreading layoffs over weeks. The statute also includes a 90-day aggregation rule that catches "rolling layoffs" where an employer staggers separations to keep each round below the threshold.

What counts as a "single site of employment"

Site is geographical. A single building, a campus, or a group of buildings under common operational control all count as one site. A truly mobile workforce (truck drivers, traveling sales representatives, remote engineers) is treated as employed at the site they are assigned to or report to, even if they rarely visit.

Remote work has muddied this analysis since 2020. The DOL has not issued binding remote-work-specific guidance, but court interpretations through 2026 have generally followed the "site of assignment" rule: a remote employee whose paychecks come from headquarters and whose manager works at headquarters is counted as employed at headquarters for WARN purposes.

What employers must include in the notice

A WARN notice must contain:

A statement that the planned action is permanent or temporary
The expected date of the first separation
An anticipated schedule for further separations
The job titles of positions affected and the names of employees in each
Whether bumping rights exist (positions where seniority lets a senior employee displace a junior one in another role)
The name and contact information of a company official the affected employee can contact

The notice goes to three parties: the affected employees (or their bargaining representative if union-represented), the state's dislocated worker unit, and the chief elected official of the local government where the site is located (29 CFR § 639.7, verified April 2026).

The recognized exceptions

WARN's 60-day notice can be reduced or excused under three statutory exceptions.

The faltering company exception applies only to plant closings (not mass layoffs). The employer must have been actively seeking capital or business that, if obtained, would have avoided or postponed the shutdown, and must have reasonably and in good faith believed that giving the WARN notice would have precluded that capital or business.

The unforeseeable business circumstances exception applies to both plant closings and mass layoffs. The employer must show that the cause of the layoff was outside its control and not reasonably foreseeable at the time the 60-day notice would have been required. Major contract cancellations, sudden loss of a key customer, and pandemic-era government shutdowns have all been litigated under this exception with varied results.

The natural disaster exception applies to layoffs caused by floods, earthquakes, or similar events, regardless of foreseeability (29 CFR § 639.9, verified April 2026).

When an exception reduces the notice period, the employer must still give whatever notice is practicable under the circumstances and must include in the notice a brief statement of the basis for reducing the period.

Federal and state mini-WARN comparison

Twenty-some states layer additional protections on top of the federal floor. The most worker-friendly statutes are in California, New York, New Jersey, and Illinois.

Jurisdiction	Threshold	Notice period	Covered actions
Federal WARN	100 FT employees	60 days	Plant closing affecting 50+, mass layoff affecting 50+ (33% of workforce) or 500+
California (Cal-WARN)	75 employees	60 days	Layoffs of 50+, plant closings, relocations of 100+ miles
New York (NY-WARN)	50 employees	90 days	Mass layoffs of 25+ workers (33% of workforce) or 250+, plant closings of 25+
New Jersey (Millville-Dallas)	100 FT employees	90 days, plus mandatory severance	Mass layoffs of 50+, plant closings of any size at established facility
Illinois (IL-WARN)	75 FT employees	60 days	Plant closings of 50+, mass layoffs of 25+ workers (33% of workforce) or 250+

Each state's specific thresholds, covered actions, and remedies are documented on the state-specific calculator pages (replace /ca with your state). For example, New York's overlay walks through NY-WARN's 90-day rule and the interplay with state unemployment.

What to do if you didn't get notice

If your employer was covered by WARN and failed to give the required 60 days, you may have a back-pay claim for up to 60 days of wages and benefits. The claim runs to the affected employee directly (this is unusual: most labor statutes require an agency to file the claim on the employee's behalf). The remedy includes the value of fringe benefits the employer would have provided (health insurance, retirement contributions, accrued vacation that would have been paid out) (29 U.S.C. § 2104, Cornell Law, verified April 2026).

A WARN suit is filed in federal district court. The statute of limitations is generally 2 years from the date of the violation, although some courts have applied state-law analogs that run longer. Document everything: the date you were notified of the layoff, the actual date of separation, the size of the workforce reduction, and any notice (or lack of notice) sent to your state's dislocated worker unit.

The layoff calculator checks your specific situation against federal and state WARN thresholds and surfaces whether the math suggests you are owed back pay. For tactical companions, see the 21-day OWBPA consideration period for severance agreements and the tax withholding rules that apply to your separation pay.

FAQ

Does WARN apply if I am the only person being laid off?

No. WARN's thresholds require 50 or more affected workers in the same 30-day period at the same site (with the higher 500-worker bar bypassing the percentage test). An individual termination, even by a covered employer, does not trigger WARN.

What if my employer paid me 60 days of "severance" instead of giving 60 days of notice?

Pay in lieu of notice is permitted. The employer can give you 60 days of pay and benefits and have you stop working immediately. The employer must include in the WARN notice that the action is taking effect immediately with pay in lieu of the notice period, and the pay must include all wages and benefits the employee would have received during the notice period. If the pay is shorter than 60 days, the employer is liable for the gap (29 CFR § 639.10, verified April 2026).

Can my employer count vacation pay or severance against the WARN back-pay liability?

Vacation pay accrued before the layoff cannot offset WARN damages. Severance payments can offset WARN damages only if the severance is conditioned on the employee waiving WARN claims, AND the employee actually signs the waiver. Most severance agreements include such a waiver as part of a general release; an OWBPA-defective release is unenforceable as to ADEA claims but may still be effective as to WARN claims unless WARN notice was a separately bargained-for consideration.

What if I work remotely for a company headquartered in another state?

Your "site of employment" is generally the employer's location you report to, even if you have not physically been there in years. WARN coverage is determined by the headcount at that site. If you work for a 200-employee headquarters and the company lays off 100 employees there in a 30-day period, you are likely covered even if you are physically in another state.

Does WARN apply to government employees?

No. The federal WARN Act expressly excludes "the United States, any State of the United States, any unit of local government or any agency of the United States or of any State or unit of local government" (29 U.S.C. § 2101(a)(1), verified April 2026). However, government employees may have separate civil-service or union-bargained notice rights. See your agency's reduction-in-force regulations for the applicable framework.