SBIR and STTR Grants Explained
SBIR and STTR are the largest federal grant programs for small businesses doing R&D. Over $4 billion is awarded annually across 11 agencies. Here's how they work.
The Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) programs are the largest source of federal grant funding for small businesses doing research and development. Over $4 billion is awarded annually across 11 participating federal agencies: NSF, NIH, DOD, DOE, NASA, USDA, DOC, DOT, EPA, ED, and HHS.
The Phase Structure
SBIR and STTR awards follow a three-phase structure:
Phase I: Proof of concept. Awards range from $150,000 to $275,000 (varies by agency) for 6–12 months of work. The goal is to demonstrate technical feasibility. Phase I is competitive across all applicants.
Phase II: Full R&D. Awards of $750,000–$2M+ for 2 years. Only Phase I awardees are eligible to apply. The goal is to develop and demonstrate the technology to commercialization readiness.
Phase III: Commercialization. No SBIR/STTR funds — Phase III is where the company transitions to private investment, product revenue, or non-SBIR federal contracts. Some agencies have Phase III contracts available for successful Phase II recipients.
SBIR vs. STTR
SBIR requires the small business to perform the majority (at least 2/3) of the R&D work. STTR requires a formal partnership with a research institution (university, federal lab, nonprofit research organization) that performs at least 30% of the work. STTR is the right vehicle if your technology is based on university research and you want to maintain the academic partnership through the development phase.
Who Qualifies
- For-profit US business with fewer than 500 employees
- More than 50% owned and controlled by US citizens or permanent residents (or by another eligible small business)
- Principal Investigator must be primarily employed by the small business (SBIR) or by either the business or the research institution (STTR)
Nonprofits and universities are not eligible to lead SBIR/STTR applications, though they can be subcontractors.
Finding Open Solicitations
Each of the 11 agencies issues solicitations on their own schedule. NIH posts Parent Announcements that are always open. DOD posts agency-wide solicitations twice a year. NSF issues topic-specific solicitations throughout the year. The SBIR.gov website aggregates open solicitations across all agencies. freegrantdb.com indexes SBIR/STTR opportunities alongside other federal programs so you can find them in a single search.
The Most Common SBIR Mistakes
Applying to the wrong agency topic. SBIR success depends almost entirely on alignment between your technology and the specific agency topic. Read the topic description carefully and, if possible, contact the Technical Point of Contact listed in the solicitation before submitting.
Underdeveloping the commercialization section. Federal reviewers know that government R&D funding is most valuable when it creates products and companies. Phase I applications that treat commercialization as an afterthought score lower. The commercialization plan should be specific: target market, customer discovery evidence, revenue model, competitive landscape.