Eligibility for an SBIR award is not a judgment call by a reviewer. It is a set of pass-fail tests applied to your company before anyone reads the science, and failing one of them disqualifies an otherwise excellent proposal. The tests are worth understanding early, because restructuring a cap table or a payroll takes months and a solicitation window does not wait.

The four questions every applicant is screened on

Stripped of the paperwork, the agency is asking four things. Are you a for-profit business organized in the United States and operating primarily inside it? Are you small enough under the applicable size standard, counting affiliates and not just your own payroll? Is ownership and control in the hands of parties the statute permits? And will the work actually be performed where the program requires it?

  • Entity type: a for-profit concern. Nonprofits, universities and government labs cannot be the SBIR applicant, though they can appear as subawardees.
  • Size: a headcount cap that includes employees of affiliated companies, not a revenue test.
  • Ownership and control: majority ownership by US individuals or by other eligible small businesses, with a separate authorized path for certain investor-owned companies at some agencies.
  • Place of performance: substantially all of the work in the United States, with narrow, pre-approved exceptions.

Each of those thresholds is set by the Small Business Administration and restated in every agency solicitation, and some have moved over the years. Treat any figure you read anywhere — including here — as a prompt to open the current solicitation and confirm it.

Where applicants actually get caught

Rejections rarely come from the obvious cases. They come from a founder who also owns a larger company, from an investor whose portfolio is treated as one enterprise, from a principal investigator who is still primarily employed by a university, or from a parent company abroad that nobody thought to disclose. These are structural facts about your business that the agency evaluates against its own rules, not judgment calls you can argue your way through in a cover letter.

Registration is the other quiet trap. Federal award systems require several registrations that take real calendar time to complete, and a proposal cannot be submitted without them. Start those the day you decide to apply, not the week the deadline lands. The broader mechanics are covered in the SBIR application guide.

Agency variation is the rule, not the exception

The SBIR Policy Directive sets a floor, but agencies layer requirements on top. A defense topic may impose facility, personnel or export-control conditions that a health-research topic never mentions. Some agencies accept investor-majority ownership under an authorization process; others do not. A topic description can add its own constraints. This is the single most common source of bad advice: someone repeats what was true at one agency as if it were the program-wide rule. When you compare agencies, compare their solicitations, not their reputations — a point that matters as much as agency selection itself.

If your company sits anywhere near a line, ask the agency's program contact before you invest in writing. They answer eligibility questions, and calling a program manager early is normal and expected. This article is general information rather than legal advice; confirm your own facts with counsel and with the agency.

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