Match the deadline to the substance, mixture and employer task.
OSHA extended its HazCom 2024 transition dates in January 2026. The federal deadlines below separate supplier requirements from necessary workplace-label, program and new-hazard training updates.
| Task | Compliance date |
|---|---|
| Manufacturers, importers and distributors evaluating substances: modified provisions | May 19, 2026 |
| Employers, substances: necessary workplace-label, program and new-hazard training updates | November 20, 2026 |
| Manufacturers, importers and distributors evaluating mixtures: modified provisions | November 19, 2027 |
| Employers, mixtures: necessary workplace-label, program and new-hazard training updates | May 19, 2028 |
Existing hazard-communication duties continue during the applicable transition. Check state-plan and site-specific requirements for your workplace.
Sources checked October 8, 2026: 29 CFR 1910.1200(j) and OSHA extension notice.

