What SBIR and STTR Are
The Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) programs are congressionally mandated federal grant programs that reserve a portion of federal R&D budgets for small businesses developing innovative technology with commercial potential. They are the most significant source of early-stage federal grant funding available to small businesses — and unlike most grants, they don't require existing revenue or years in business.
The programs operate in phases. Phase I validates the scientific and technical merit of an idea — awards are smaller and faster to obtain. Phase II funds full R&D development for projects that successfully complete Phase I. Phase III is commercialization, funded through private investment or federal contracts rather than SBIR/STTR funds.
SBIR vs STTR — Key Differences
Small Business Innovation Research (SBIR)
SBIR requires that the principal investigator be primarily employed by the small business. The research must be performed primarily by the small business (at least 2/3 of work). Eleven agencies participate: DOD, NIH, NASA, NSF, DOE, EPA, USDA, DOT, ED, DHS, and NSF. Phase I awards typically range from $50,000 to $275,000. Phase II awards typically range from $750,000 to $1.75M depending on agency.
Small Business Technology Transfer (STTR)
STTR requires a formal research partnership between the small business and a US research institution (university, federally funded R&D center, or nonprofit research institution). At least 40% of work must be done by the small business, and at least 30% by the research partner. Five agencies participate: DOD, DOE, HHS, NASA, and NSF. Phase I awards typically $150,000–$225,000. If you're commercializing university research, STTR is the correct program.
Which Agencies Award the Most
Department of Defense (DOD)
DOD runs the largest SBIR/STTR program by volume — roughly 40% of total SBIR funding. DOD includes Army, Navy, Air Force, DARPA, MDA, and other components, each running separate solicitations. If your technology has any defense application, DOD SBIR is the highest-volume opportunity. DARPA SBIR awards are particularly prestigious and well-funded.
National Institutes of Health (NIH)
NIH runs the second-largest SBIR program, focused on health, biomedical research, and medical technology. Phase I awards up to $275,000. NIH is particularly accessible to companies developing diagnostics, therapeutics, medical devices, and health technology. The NIH SBIR/STTR application uses the same format as NIH research grants — familiarity with NIH grant writing is an advantage.
National Science Foundation (NSF)
NSF SBIR focuses on deep tech, engineering, and scientific innovation. Phase I awards up to $275,000. NSF runs the America's Seed Fund program with dedicated resources for first-time applicants, making it one of the most accessible entry points for tech startups. NSF also offers a Zip Code initiative targeting underserved geographic areas.
Department of Energy (DOE)
DOE SBIR covers energy efficiency, renewable energy, advanced manufacturing, and clean technology. Phase I awards up to $275,000. The DOE program is particularly relevant in 2026 given expanded clean energy funding from the Inflation Reduction Act. DOE also offers direct vouchers and lab partnerships for SBIR recipients.
SBIR Eligibility Requirements
- For-profit US business organized under US law
- Fewer than 500 employees at time of award
- At least 51% owned and controlled by US citizens or permanent residents
- Principal investigator must be primarily employed by the small business (SBIR) or have a formal research partner (STTR)
- No revenue requirement — pre-revenue companies are eligible
- Businesses majority-owned by venture capital are eligible for some agencies but not all
How to Apply
All SBIR/STTR opportunities are posted at sbir.gov. Each agency runs its own solicitation calendar — most have 1–2 open solicitation windows per year. The application has three main components: a technical volume (the R&D proposal), a commercialization plan (how you'll take this to market), and company/financial information.
First-time applicants should: (1) find relevant topic areas at sbir.gov matching your technology, (2) contact the program manager listed in the solicitation before applying — most welcome pre-submission calls, (3) review successful Phase I abstracts in the SBIR award database to understand what funded proposals look like.
SBIR Takes 6+ Months — Need Capital Sooner?
SBIR Phase I review cycles typically take 6 months from application to award notification. If your business needs capital while you wait — for payroll, equipment, or R&D expenses — working capital financing can bridge the gap. Revenue-based options fund in 24–72 hours. Many SBIR applicants use short-term financing to continue development while their proposal is under review.
See What Funding You Qualify For