Title 29 › Chapter CHAPTER 23— - WORKER ADJUSTMENT AND RETRAINING NOTIFICATION › § 2101
Requires large employers to give notice before big plant closings or mass layoffs and explains who and what counts for those rules. Employer: a business with 100 or more full-time workers, or 100+ workers who together work at least 4,000 hours per week (not counting overtime). Plant closing: a shutdown at a single site or unit that causes job loss for 50 or more non‑part‑time workers within any 30‑day period. Mass layoff: a cut that is not a plant closing but causes job loss at one site in 30 days either for at least 33% of the workforce and at least 50 employees, or for at least 500 employees. Representative: the exclusive employee representative under labor law. Affected employees: those likely to lose work because of a proposed closing or layoff. Employment loss: firing (not for cause), voluntary leave, or retirement excluded; also a layoff over 6 months or a cut in hours over 50% for each month of any 6‑month span. Unit of local government and part‑time employee are defined by taxing power and by working under 20 hours/week or under 6 of the past 12 months. When a business (or part of it) is sold, the seller must give required notices up to the sale date and the buyer must give notices after the sale. Any non‑part‑time worker employed on the sale date becomes the buyer’s employee immediately. An employee does not count as having an employment loss if the employer offers a transfer to a nearby site with no more than a 6‑month break, or offers any other site with no more than a 6‑month break and the employee accepts within 30 days of the offer or the closing/layoff, whichever is later.
Full Legal Text
Labor — Source: USLM XML via OLRC
Legislative History
Reference
Citation
29 U.S.C. § 2101
Title 29 — Labor
Last Updated
Apr 6, 2026
Release point: 119-73