The SBIR size standard is a headcount test, not a revenue test. A company with substantial revenue and a dozen employees passes it comfortably; a pre-revenue company that is counted together with affiliated businesses can fail it. That mismatch between intuition and rule is why size disqualifications surprise founders who were certain they were small.

How the count is built

The standard is expressed as a maximum number of employees. Three details do most of the damage.

  • Everyone counts. Full-time, part-time, temporary and, in many cases, leased or shared personnel are included. It is a body count, not a full-time-equivalent calculation.
  • Affiliates count. Employees of companies that control you, that you control, or that a common party controls are added to yours.
  • It is averaged, not a snapshot. Size is assessed over a trailing period rather than on the day you submit, so a recent layoff does not instantly fix an over-count.

The specific threshold is set by the Small Business Administration and restated in each agency solicitation. The long-standing figure for SBIR is commonly cited as five hundred employees including affiliates, but thresholds and the way they are measured do get revised, and a different standard can apply for other federal purposes. Read the number in the solicitation you are actually applying under rather than trusting any secondary source, including this one.

Why revenue is the wrong instinct

Many federal size standards are revenue-based and vary by industry code, which is where the confusion starts. SBIR uses headcount because the program is aimed at small technical teams rather than small balance sheets. A profitable, capital-efficient company with a lean payroll is exactly the profile the program was built for. Conversely, a services business that staffs up with contractors can drift over the line while looking modest financially.

The counting mistakes that matter

The most common error is treating the applicant entity in isolation. If a founder also runs another operating company, or an investor holds control positions across a portfolio, those headcounts may be aggregated — the mechanics of which come from the affiliation rules rather than from the size standard itself. The second most common error is misclassifying people: independent contractors who function as staff, personnel supplied by a staffing firm, and employees of a foreign parent or sister company have all been counted in ways applicants did not anticipate.

A third, quieter problem is timing. Companies planning to hire aggressively on the strength of a Phase II award should look at where that puts them for the next application, because eligibility is tested each time you apply, not once. Growth plans and the jump from Phase I to Phase II interact more than founders expect, and the same is true of early hiring decisions.

If you are within striking distance of the threshold, do the count formally before you write, document how you reached it, and ask the agency's program contact when a category is ambiguous. This is general information rather than legal advice; size and affiliation determinations are made by SBA and the funding agency, and a company near the line should confirm with its own counsel. The rest of the eligibility picture sits in the SBIR and STTR guide.

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