The HazCom compliance window everyone misread: what to do before May 19

OSHA's January 15 final rule (the official citation is 91 FR [number], for those tracking) extends four compliance dates by exactly four months each:

• § 1910.1200(j)(2)(i), initial substance-evaluation compliance, now May 19, 2026 (was January 19, 2026)
• § 1910.1200(j)(2)(ii), extended by four months
• § 1910.1200(j)(3)(i), extended by four months
• § 1910.1200(j)(3)(ii), extended by four months

The four-month shift is uniform across the four dates. The tiered structure of the original compliance schedule is preserved.

OSHA explicitly invoked the “good cause” exception to forgo notice-and-comment rulemaking. The agency's reasoning, in its own words: the regulated community had an “immediate need to know whether compliance will be expected by the existing compliance date, despite the lack of official agency guidance,” and that the additional time required for a normal notice-and-comment process would itself add further uncertainty about compliance obligations. In practical terms: OSHA wasn't going to be able to publish the implementation guidance before January 19, and rather than enforce a deadline against employers who didn't have the guidance to comply with, they extended.

The substantive requirements of the updated HazCom Standard are unchanged. If you've already completed substance re-evaluation under GHS Revision 7, that work is still good. The extension is about the deadline, not the content.

The 2012 HCS continues to apply during the transition period. Employers can comply with either the 2012 version, the updated version, or, and this is in § 1910.1200(j)(4), a combination of the two, until the compliance date for each requirement passes.

Three checks, in priority order:

1. Confirm your re-evaluation status. If your team has not yet completed substance re-evaluation against GHS Rev 7 criteria, you have two and a half weeks. Substances classified differently under Rev 7 than Rev 3 (which the 2012 HCS aligned with) need updated SDSs and labels.

2. Update SDS distribution. Customers receiving SDSs from you need the Rev 7 versions in their hands by May 19. If your distribution process has any latency, account for it.

3. Update internal training. § 1910.1200(h) requires that employees be trained when a new chemical hazard is introduced. If your re-evaluation has reclassified substances already in your inventory, that's a new hazard from a training perspective. Toolbox talks, LMS modules, and any 10-hour or 30-hour Outreach material that covers HazCom should reflect the current classification.

OSHA's stated reason for the extension was to publish implementation guidance. As of this post's publication, that guidance has not yet appeared in the OSHA technical-amendments queue. We're watching for it. If it lands, we'll publish a follow-up.

In the meantime, employers in the regulated community should not interpret the extension as a signal that the rule is in jeopardy. It isn't. The extension is procedural. The substantive compliance obligations are intact and will be enforced after May 19.

If you're a RegLogic customer with subscriptions on § 1910.1200, you got an email at 7:00 AM ET on January 16 with the extension summary, the before/after compliance dates, and a link to the full Federal Register text. The amendment was visible in the platform with the new dates by 6:00 AM ET on the same day.

If you're not a RegLogic customer and you're doing this kind of tracking by hand: subscribe to the Federal Register's HazCom email alerts at the very minimum. Better: build a workflow where one person owns the citation and publishes summaries for the team.

If you'd like to see how RegLogic surfaces a deadline change like this one, including the diff view that shows exactly which words in § 1910.1200(j) changed, request a demo and we'll walk through it on your environment.