What SBIR and STTR actually are
SBIR (Small Business Innovation Research) and STTR (Small Business Technology Transfer) are congressionally mandated programs that require federal agencies with large extramural R&D budgets to set aside a portion of those budgets for small businesses.
SBIR requires agencies with extramural R&D budgets over $100 million to set aside 3.2% for small business awards. STTR requires agencies with extramural R&D budgets over $1 billion to set aside 0.45%. In dollar terms, that adds up to more than $4 billion per year flowing to small businesses doing technical work.
The programs run in phases:
Phase I is a feasibility award. Maximum funding is $275,000 and the period of performance is typically 6 to 12 months. The question you're answering: can this idea actually work?
Phase II is full R&D. Maximum funding is $1.84 million over 24 months. You're building it out, generating data, moving toward a product or deployable technology. Only Phase I winners are eligible for Phase II.
Phase III is commercialization. There is no set funding limit, and Phase III awards are not counted against an agency's SBIR/STTR set-aside. This is where agencies can sole-source follow-on contracts to Phase II companies without a competitive process, because the government has already invested in the technology.
The key structural difference between SBIR and STTR: STTR requires a formal research partnership with a U.S. research institution (university, federally funded R&D center, or nonprofit). At least 40% of the work must be performed by the small business, and at least 30% by the partner institution. SBIR has no such requirement, though informal partnerships are common.
Which agencies run these programs
Eleven federal agencies participate in SBIR. Ten participate in STTR. The agencies with the largest programs:
- Department of Defense (DoD) — the largest SBIR agency by far, running programs across the Army, Navy, Air Force, DARPA, MDA, and other components. DoD accounts for roughly 40-45% of all SBIR dollars.
- National Institutes of Health (NIH) — the second largest, focused on biomedical research and health technology.
- Department of Energy (DOE) — covers energy technology, materials science, and related fields.
- NASA — aerospace, earth science, space technology.
- National Science Foundation (NSF) — broad scientific research; NSF's America's Seed Fund program is well regarded for very early-stage companies.
Other participating agencies include the Department of Agriculture (USDA), Environmental Protection Agency (EPA), Department of Education, Department of Homeland Security, Department of Transportation, and the Department of Commerce.
Each agency publishes its own solicitations on its own timeline. DoD typically runs two major solicitations per year plus numerous topic-specific ones. NIH runs three cycles annually. NSF accepts applications year-round through its America's Seed Fund portal.
Eligibility
The eligibility rules are fairly clear:
- For-profit U.S. small business
- At least 51% owned and controlled by U.S. citizens or permanent resident aliens
- Fewer than 500 employees (including affiliates)
- The principal investigator must be primarily employed by the applicant company during Phase II (at least 51% of their time)
There is no revenue floor. Pre-revenue startups apply and win. There is also no requirement to have government contracts on your record. Many first-time SBIR winners had no prior federal contracting experience.
One important restriction: a company that has received more than $2 million in SBIR/STTR Phase II awards in the prior two fiscal years must obtain a Commercialization Readiness Review before receiving additional awards. This is aimed at ensuring the program funds new innovators, not the same handful of companies recycling proposals indefinitely.
How diverse businesses fit in
SBIR and STTR have no set-aside authority. There is no MBE preference, no WOSB preference, no scoring bonus for diverse ownership. Every applicant competes on the technical merit of their proposal.
That said, women-owned small businesses and minority-owned small businesses have historically participated in both programs at rates above their share of the general small business population. The Small Business Administration publishes annual SBIR/STTR data breakdowns by ownership category. In recent reporting periods, women-owned firms have received 20-23% of SBIR awards, above their roughly 19% share of all small businesses.
Why does this matter? Because the objection you often hear from diverse business owners is that federal contracting is rigged through relationships and primes. SBIR is one of the few federal programs where the primary selection criterion is a written technical proposal reviewed by subject matter experts. The playing field is not level everywhere in federal contracting, but SBIR proposal review is one of the more meritocratic processes in the government.
If you have a genuine technical innovation and you can write a credible proposal, your background does not systematically disadvantage you.
Finding solicitations
Start at sbir.gov. The federal government consolidated SBIR and STTR solicitation information there, and it is the authoritative source for open solicitations across all agencies.
Each solicitation lists specific topics, which are essentially problem statements from the agency. A DoD SBIR solicitation might have 200 or more topics, each describing a technical challenge the relevant office wants solved. You apply to a specific topic, not to the program generically.
Agency-specific portals often have more detail and are where you actually submit:
- DoD: defensesbirr.ncms.org (the DSIP system is being phased in)
- NIH: grants.nih.gov
- NSF: seedfund.nsf.gov
- DOE: science.osti.gov/sbir
Sign up for email notifications on sbir.gov for the agencies most relevant to your technology area. Solicitations typically open with 30 to 45 days for proposal submission. Missing the window means waiting for the next cycle, which can be 6 to 12 months away.
The Phase I proposal
A Phase I proposal is typically 15 to 30 pages, depending on agency-specific page limits. The exact structure varies by agency, but the core sections are consistent:
Technical volume: This is the majority of the proposal. Describe the technical problem, your proposed approach, why your approach is feasible, and what you will specifically accomplish during Phase I. Reviewers are subject matter experts. They will know if you are hand-waving.
Objectives and milestones: Concrete deliverables by month. If you are proposing a 6-month Phase I, what will you have at month 2, month 4, month 6?
Commercialization plan: Even in Phase I, agencies want to see a credible path to a product. Who buys this? What is the market? How does Phase II lead to Phase III?
Budget: Direct labor, fringe, overhead, G&A, fee. If you do not have established indirect rates yet, use forward-pricing rates and document your assumptions. Indirect rates that look inflated without explanation are a common problem for first-time applicants.
Principal investigator qualifications: The PI's technical background must be relevant to the work. A strong CV directly matched to the topic area helps. Gaps raise questions.
The review process is blind to company size and ownership identity. Proposals are scored on technical merit, team qualifications, and commercialization potential. Funding rates vary by agency but are often in the 10-20% range for Phase I.
First-time applicants should read at least three funded abstracts in their technical area before writing a proposal. Sbir.gov publishes award abstracts going back many years. This is the fastest way to calibrate your language and scope to what agencies actually fund.
What a Phase II award does for your contracting position
Winning a Phase II award has downstream effects on your federal contracting position that go beyond the direct funding.
Sole-source authority: Phase III work can be awarded on a sole-source basis under the SBIR Policy Directive. If an agency wants to continue using your technology after Phase II, they can contract with you directly, without competition. This is meaningful. Most federal contracts require full and open competition or a specific set-aside justification. Phase III bypasses that.
Capability statement credibility: "Phase II SBIR awardee, [Agency Name]" is a concrete, verifiable credential that tells contracting officers and prime contractors that a federal technical review panel evaluated your innovation and funded it. That carries weight. Add it to your capability statement immediately.
Past performance: Phase I and Phase II contracts are performance contracts. Executing them well generates CPARs (Contractor Performance Assessment Reporting System) records. Past performance is scored in competitive procurements. A strong Phase II CPARS gives you a past performance record with the federal government even if you have never won a traditional contract.
Prime contractor relationships: Large primes actively scout Phase II winners in their technology areas. DoD runs a Commercialization Readiness Program to facilitate this. A Phase II award in a DoD-relevant technology area puts you on the radar of Lockheed Martin, Raytheon, Boeing, and others who need innovative subcontractors.
One practical note on timing
The gap between Phase I completion and Phase II award can be 6 to 12 months or longer. During that period you have no federal funding but you are expected to demonstrate progress toward commercialization to strengthen your Phase II proposal. Plan your cash flow accordingly. NSF's Phase IIB program and the DoD SBIR Commercialization Pilot Program offer supplemental funding for companies actively pursuing commercial customers during this gap. Check agency-specific bridge funding options when you submit your Phase I proposal, not after you win.
The programs are real, the funding is real, and the application process is learnable. Start with sbir.gov, identify three to five topics that match your technology, read the funded abstracts in your area, and write a narrow, specific, technically credible proposal. That is the whole game.
