Do you have to electronically submit OSHA 300A? The 20–249 and 250+ rules explained

Keeping an OSHA 300 log and electronically submitting the 300A summary are two different obligations. Plenty of businesses keep the log but aren't sure whether they have to send anything to OSHA. Here's how to tell.

The two-part rule

Under 29 CFR 1904.41, you must electronically submit your Form 300A if either of these is true:

1. You have 250 or more employees at the establishment, and you're not in a partially-exempt industry. Or,
2. You have 20–249 employees at the establishment and you're in a designated high-hazard industry.

That's it. Two size bands, with industry as the tiebreaker for the smaller one.

What "establishment" means

The count is per establishment — a single physical location — not your whole company. A company with five sites looks at each site's headcount separately. Count everyone who worked there during the year, including part-time, seasonal, and temporary workers.

What "high-hazard industry" means

OSHA designates certain industries as high-hazard for this rule — think manufacturing, warehousing, trucking, grocery, nursing and residential care, and similar sectors with higher injury rates. If your establishment's actual business activity falls into one of those categories and you have 20 or more employees, treat the 300A electronic filing question as open even though you're under 250.

The exact list is long and specific, so rather than guess, start the filing checker — it asks your state, business activity, and size and tells you where you land.

The 100-employee case-detail rule

There's a newer overlay: establishments with 100 or more employees in certain high-hazard industries must also submit the detailed 300 and 301 case information, not just the 300A summary. If that's you, it's the same deadline (March 2) — just more data.

If you're covered

Being covered isn't bad news — it just means there's a filing to do. The filing checker tells you where your establishment lands first; if you are covered, RegFile drafts the filing from your 300 log, you authorize it, and we file it to OSHA's ITA.

Start the filing checker →

This is informational, not legal advice — verify against your adopted rule.