Under the most commonly cited federal standard, a small business is one with fewer than 500 employees. That’s the Small Business Administration’s default size ceiling, and it’s the number that governs eligibility for set-aside government contracts, SBA-guaranteed loans, and grants reserved for smaller firms. But 500 is only the starting point for the question of how many employees is considered a small business. The SBA sets different limits for different industries, ranging as low as 100 and as high as 1,500. And a separate stack of federal laws imposes obligations on employers at 10, 15, 20, 50, and 100 workers, whether or not the SBA calls you small.
The SBA’s 500-Employee Default
The SBA’s default size standard, codified at 13 CFR Part 121, is 500 employees.1eCFR. 13 CFR Part 121 – Small Business Size Regulations Falling under that ceiling is what qualifies a business for federal small-business programs. Companies that exceed it are shut out of those programs, so the count matters at the application stage.
Overstating your small-business status isn’t a paperwork issue to the SBA. False size claims can bring fines, loss of awarded contracts, and suspension from future federal procurement.
How the SBA Counts Employees
The SBA doesn’t use a snapshot of your current payroll. It averages your headcount across every pay period in the preceding 24 completed calendar months. If your business hasn’t been operating that long, the average covers whatever pay periods you’ve had.2eCFR. 13 CFR 121.106 – How Does SBA Calculate Number of Employees
Every person on payroll counts the same. Full-time, part-time, temporary, and workers supplied through staffing agencies are all weighted equally. Only unpaid volunteers are excluded.
Affiliates Count Too
If your business is affiliated with another company through shared ownership, common management, or economic dependence, the SBA adds that company’s employees to yours. The power to control is enough; you don’t have to have exercised it. Owning 50 percent or more of another firm’s voting stock, sharing officers or directors who control both boards, or getting 70 percent or more of your revenue from a single other firm can each trigger affiliation.3eCFR. 13 CFR 121.103 – How Does SBA Determine Affiliation Family members with substantially identical business interests may be treated as a single party, with their employees combined.
Aggregation is retroactive. If you acquire an affiliate during the 24-month lookback, the SBA counts that affiliate’s employees for the entire period, not just from the acquisition date forward.2eCFR. 13 CFR 121.106 – How Does SBA Calculate Number of Employees A company that looks comfortably small on its own can cross the threshold once affiliates are pulled in.
Industry-Specific Size Standards
The 500 figure is just the default. The SBA assigns a specific standard to every industry using the North American Industry Classification System, and the numbers can run well above or below 500. Manufacturing ceilings often sit at 750, 1,000, or 1,500 employees. An automobile manufacturer can employ up to 1,500 workers and still be classified as small; a semiconductor manufacturer can have up to 1,250.4eCFR. 13 CFR Part 121 – Small Business Size Regulations – Section 121.201
Wholesale trade runs the other direction. Many wholesale NAICS codes set the ceiling between 100 and 250 workers, well below the default. The wrong NAICS code can disqualify you from programs you’d otherwise be eligible for, or let you claim small-business status you don’t hold. Companies operating across multiple industries need to identify their primary NAICS code, meaning the one that generates the most revenue, and use that code’s standard.
The SBA reviews all size standards every five years and takes public comments before finalizing changes, so the numbers aren’t permanent.5U.S. Small Business Administration. Size Standards Checking the current table before applying is worth the few minutes it takes.
Federal Employer Obligations by Headcount
The SBA’s ceiling decides whether you qualify for small-business benefits. A different set of federal laws imposes duties on employers at much lower headcounts, and those laws don’t care what the SBA thinks of your size. They care about your actual employee count.
10 Employees: OSHA Recordkeeping
If you had 10 or fewer employees at all times during the previous calendar year, you’re partially exempt from OSHA’s routine injury and illness recordkeeping. Exceed 10 even briefly, and you have to start maintaining OSHA logs the following year.6Occupational Safety and Health Administration. 1904.1 – Partial Exemption for Employers With 10 or Fewer Employees The trigger is peak employment, not average. All employers, regardless of size, must still report fatalities, hospitalizations, amputations, and eye losses to OSHA.
15 Employees: Title VII and the ADA
Federal anti-discrimination law starts here. Title VII of the Civil Rights Act and the Americans with Disabilities Act each define a covered employer as one with 15 or more employees for each working day in at least 20 calendar weeks of the current or preceding year.7Office of the Law Revision Counsel. 42 US Code 2000e – Definitions8Office of the Law Revision Counsel. 42 US Code 12111 – Definitions Below 15, these federal protections don’t reach your workers, though state laws may still cover them. At 15, you’re subject to federal rules on hiring, firing, reasonable accommodations for disabilities, and workplace harassment.
20 Employees: ADEA and COBRA
Two significant obligations start at 20. The Age Discrimination in Employment Act protects workers 40 and older and applies to employers with 20 or more employees for at least 20 calendar weeks per year.9U.S. Equal Employment Opportunity Commission. Age Discrimination in Employment Act of 1967
COBRA also kicks in at 20. If your group health plan was maintained during a year when you normally employed 20 or more people on a typical business day, you must offer departing employees the option to continue coverage at their own expense.10Office of the Law Revision Counsel. 26 US Code 4980B – Failure to Satisfy Continuation Coverage Requirements
50 Employees: ACA and FMLA
Fifty is the threshold that changes the most about how you operate. Under the Affordable Care Act, an employer averaging 50 or more full-time employees (including full-time equivalents) over the prior year becomes an Applicable Large Employer. That designation requires offering affordable minimum-value health coverage to at least 95 percent of your full-time workforce or paying penalties.11Internal Revenue Service. Determining if an Employer Is an Applicable Large Employer A full-time employee under the ACA is anyone averaging at least 30 hours per week or 130 hours per month. Full-time equivalents are calculated by combining all non-full-time monthly hours (capping each worker at 120) and dividing by 120.
The Family and Medical Leave Act also starts at 50. Covered employers must provide up to 12 weeks of unpaid, job-protected leave for qualifying family and medical reasons. But eligibility has a geographic wrinkle: an individual employee is only eligible if at least 50 of the company’s workers are employed within a 75-mile radius of that worksite.12Office of the Law Revision Counsel. 29 US Code 2611 – Definitions A 200-employee company spread across distant locations may have individual workers who aren’t covered.
100 Employees: WARN Act and EEO-1
The Worker Adjustment and Retraining Notification Act requires employers with 100 or more workers to give at least 60 days’ written notice before a plant closing or mass layoff. Fully part-time workers are generally excluded from the WARN threshold count.13Office of the Law Revision Counsel. 29 US Code 2101 – Definitions Missing the notice can make you liable for back pay and benefits to every affected employee for each day of the violation, up to 60 days.
Private employers with 100 or more employees must also file annual EEO-1 reports with the Equal Employment Opportunity Commission, disclosing workforce demographics broken down by job category, sex, and race or ethnicity.14U.S. Equal Employment Opportunity Commission. EEO-1 Employer Information Report Statistics
Tax Benefits That Reward Staying Small
A few federal provisions give preference to smaller employers rather than imposing obligations. The small business health care tax credit is available to employers with fewer than 25 full-time equivalent employees who pay average wages below an inflation-adjusted cap. It can cover up to 50 percent of premiums paid for employee coverage (35 percent for tax-exempt employers), though the full credit is reserved for businesses with fewer than 10 FTEs paying average wages of $27,000 or less. Coverage has to be purchased through the SHOP marketplace, and the credit is claimed on Form 8941.15Internal Revenue Service. Small Business Health Care Tax Credit and the SHOP Marketplace
Retirement plan options also shift with size. A SIMPLE IRA, one of the easiest employer-sponsored retirement plans to administer, is only available to businesses that employed 100 or fewer workers who each received at least $5,000 in compensation during the preceding year. Growing past 100 gives you a two-year grace period before you need to transition to a different plan structure such as a 401(k).16Internal Revenue Service. Publication 560 (2025), Retirement Plans for Small Business – Section: Who Can Set up a SIMPLE IRA Plan This 100-employee count uses a different method than the SBA’s, focusing on workers who hit the $5,000 compensation floor rather than raw headcount.
Why the Same Business Can Be Two Sizes at Once
No two agencies count employees the same way. The SBA averages all workers over 24 months and weights part-timers the same as full-timers. The ACA converts part-time hours into full-time equivalents using a monthly formula. The FMLA looks at whether you had 50 employees for at least 20 workweeks. OSHA checks peak headcount for the entire prior year. The WARN Act generally excludes part-time workers from its threshold.
A single business can be “small” for SBA contracting, an Applicable Large Employer under the ACA, exempt from OSHA recordkeeping, and covered by Title VII, all at the same time. The thresholds don’t coordinate, and each was written for a different regulatory purpose. Tracking your workforce under each methodology separately is the only reliable way to answer the small-business question for whichever agency is asking.