Federal OSHA applies to your business the moment you hire your first employee, so the honest answer to how many employees before OSHA applies is one. The widely repeated “10 employees” figure is not the coverage threshold. It is a separate rule about whether you have to keep injury and illness logs. Safety obligations and paperwork obligations run on different tracks, and mixing them up is how small employers end up with citations they did not see coming.
One Employee Triggers Full OSHA Coverage
The OSH Act defines an “employer” as any person engaged in a business affecting commerce who has employees.1Occupational Safety and Health Administration. OSH Act of 1970 Courts read “affecting commerce” broadly. If your business uses the internet, ships products across state lines, or calls out-of-state vendors, you qualify. A two-person landscaping crew is subject to the same baseline safety requirements as a manufacturer with 500 workers.
Once you have that first employee, every OSHA safety and health standard that fits your work applies: hazard communication, fall protection, machine guarding, personal protective equipment, and the rest. When no specific standard covers a particular danger, the General Duty Clause still requires you to keep your workplace free from recognized hazards likely to cause death or serious physical harm.2Occupational Safety and Health Administration. OSH Act of 1970 – Section 5 Duties It carries the same enforcement weight as any named standard.
You also have to display the official OSHA “Job Safety and Health” poster somewhere your employees can easily see it.3Occupational Safety and Health Administration. OSHA Cares Job Safety and Health Workplace Poster That applies to every covered employer regardless of size, and failure to post is a citable violation.
Severe Incident Reporting Applies at Any Size
Every covered employer, including those with one or two workers, must report a workplace fatality within eight hours. Any in-patient hospitalization, amputation, or loss of an eye must be reported within 24 hours.4Occupational Safety and Health Administration. 29 CFR 1904.39 – Reporting Fatalities, Hospitalizations, Amputations, and Losses of an Eye as a Result of Work-Related Incidents to OSHA The clock starts when you or anyone in your management chain learns of the incident. This obligation never scales down with headcount, and missing the deadlines is one of the fastest ways to draw enforcement attention.
Who Is Not Covered No Matter the Headcount
A few situations sit entirely outside federal OSHA:
- Truly self-employed people with no employees. Hire one worker and this changes.5Occupational Safety and Health Administration. Application of OSHA Requirements to Self-Employed Construction Workers
- Domestic household employment, such as privately hiring someone to clean your home or care for your children in your own residence.6Occupational Safety and Health Administration. 29 CFR 1975.6 – Policy as to Domestic Household Employment Activities
- Immediate family members working on a farm the family owns.7Occupational Safety and Health Administration. Am I Covered by OSHA
- Workers regulated by another federal safety agency, such as miners under MSHA or railroad workers under the Federal Railroad Administration.7Occupational Safety and Health Administration. Am I Covered by OSHA
- State and local government employees, who are not covered by federal OSHA directly. In states with an approved State Plan, they receive equivalent protections under state law.8Occupational Safety and Health Administration. Are State and Local Government Employers Covered by This Rule
The 10-Employee Number Is About Recordkeeping
OSHA requires most employers to maintain injury and illness logs on Forms 300, 300A, and 301. If your company had 10 or fewer employees at every point during the previous calendar year, you are exempt from that paperwork.9Occupational Safety and Health Administration. 29 CFR 1904.1 – Partial Exemption for Employers With 10 or Fewer Employees OSHA calls it a “partial” exemption for a reason. It exempts you from keeping the logs, not from OSHA.
The count uses your peak employment during the prior calendar year, not your current headcount. If seasonal help brought you to 11 workers for one pay period last year, you must keep the logs this year even if you are back down to five. Part-time, temporary, and seasonal employees all count.9Occupational Safety and Health Administration. 29 CFR 1904.1 – Partial Exemption for Employers With 10 or Fewer Employees
There is a second recordkeeping exemption based on industry. OSHA maintains a list of partially exempt low-hazard industries by NAICS code, covering categories like retail stores, financial offices, and certain service businesses.10Occupational Safety and Health Administration. Non-Mandatory Appendix A to Subpart B – Partially Exempt Industries An establishment with 50 employees may still be off the hook for routine recordkeeping if its code is on that list. And again, neither exemption affects the severe incident reporting rule above.
Higher Thresholds Bring Electronic Submission
Once you clear the recordkeeping line, larger employers take on an additional obligation: sending injury and illness data to OSHA electronically each year. The thresholds depend on both establishment size and industry.
Establishments with 250 or more employees at any point during the previous calendar year must electronically submit their Form 300A summary data annually.11Occupational Safety and Health Administration. 29 CFR 1904.41 – Electronic Submission of Employer Identification Number and Injury and Illness Records to OSHA A rule that took effect in 2024 expanded submission for establishments with 100 or more employees in designated high-hazard industries, requiring them to electronically submit data from Forms 300 and 301 in addition to the 300A.12Occupational Safety and Health Administration. Department of Labor Announces Rule Expanding Submission of Injury and Illness Records
If you are a growing business approaching these numbers, build the electronic submission into your compliance calendar well ahead of the annual deadline. OSHA posts the current portal and deadlines on its Injury Tracking Application page.
State Plans Can Change the Thresholds
Federal OSHA is not the only enforcer. The OSH Act lets states run their own workplace safety programs. Twenty-two states and territories operate plans covering both private and public sector workers, and seven more run plans that cover only state and local government employees.13Occupational Safety and Health Administration. State Plans Where a State Plan applies to your sector, the state agency inspects and enforces instead of federal OSHA.
State Plans must be at least as effective as federal OSHA, and they are allowed to be stricter.14Occupational Safety and Health Administration. State Plan – Frequently Asked Questions A state could lower the recordkeeping threshold, add training requirements, or tighten standards for specific hazards. California’s Cal/OSHA is a familiar example of a program that goes beyond the federal baseline. If you operate in a State Plan state, check your state agency’s rules directly rather than relying on the federal thresholds alone.
Penalties Do Not Shrink Because You Are Small
OSHA adjusts its maximum penalties for inflation each year. As of January 15, 2025, the maximum fine for a serious or other-than-serious violation is $16,550 per violation. Willful or repeated violations carry a maximum of $165,514 per violation.15Occupational Safety and Health Administration. US Department of Labor Announces Adjusted OSHA Civil Penalty Amounts Failure-to-abate penalties can reach $16,550 per day past the correction deadline OSHA sets.
These amounts apply at any size. OSHA does weigh business size, good faith, and violation history in calculating what it actually issues, and small employers often see reductions. But a two-employee roofing company that ignores fall protection faces the same statutory maximums as a large general contractor. The idea that OSHA does not look at small businesses is a misconception that has cost owners real money.
Use the Free On-Site Consultation Program
OSHA funds a free On-Site Consultation Program built specifically for small and medium businesses. It operates in every state and is entirely separate from OSHA’s enforcement side. A consultation visit will not produce citations or fines. Consultants walk through your workplace, flag hazards, suggest fixes, and help you build a safety program. It is especially useful for a business that has just crossed one of the thresholds above and is trying to work out what compliance looks like day to day. You can find your state’s program through OSHA’s website or by calling 1-800-321-OSHA (6742).
Quick Reference: Employee Thresholds That Matter
- One or more employees: all OSHA safety and health standards apply, including the General Duty Clause, hazard communication, and the poster requirement. Severe incident reporting is mandatory.
- Ten or fewer employees at peak in the prior calendar year: exempt from maintaining Forms 300, 300A, and 301, unless a State Plan requires otherwise.
- Eleven or more employees at peak in the prior calendar year: must maintain injury and illness logs unless your establishment qualifies for the low-hazard industry exemption.
- One hundred or more employees in designated high-hazard industries: must electronically submit Forms 300, 300A, and 301 data to OSHA annually.
- Two hundred fifty or more employees: must electronically submit Form 300A summary data to OSHA annually, regardless of industry.
For most small business owners the answer is short. OSHA’s safety rules apply from day one. The recordkeeping paperwork kicks in after 10 employees. Reporting a fatality or serious injury is required at every size. Getting any of that wrong is an enforceable violation with real financial consequences.