SBIR and STTR: Federal Innovation Funding for Small Business

Last reviewed on May 12, 2026.

What SBIR and STTR are

The Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) programs are federal initiatives that set aside a portion of agency research and development budgets for small businesses. Eleven federal agencies participate in SBIR; five of those also participate in STTR. The programs award funding for the early-stage research, prototype development, and commercialization of new technology developed by — or in collaboration with — small businesses.

SBIR/STTR is structurally different from the standard federal contract or grant. The awards fund research with specific topic descriptions; proposals respond to those topics rather than being unsolicited. Success in early phases qualifies the awardee to compete for larger downstream funding without re-competing in the open market.

SBIR vs. STTR

The two programs are similar in structure and intent but differ in one key dimension:

SBIR. The small business is the prime, and the small business performs the majority of the work. Subcontractor research institution partnerships are allowed but not required. Phase I typically requires the small business to perform at least two-thirds of the research; Phase II requires at least half.
STTR. The small business is the prime, and a partnership with a research institution (typically a university or federally funded research lab) is required. The small business must perform at least 40% of the work; the research institution must perform at least 30%.

STTR is the right path when the technology is being developed in partnership with a university lab and the small business wants to commercialize the result. SBIR is the right path when the small business is the primary developer.

The three-phase structure

Phase I — Feasibility

Funding to demonstrate the technical merit and feasibility of a proposed approach. Awards typically last 6–12 months. Phase I funding amounts vary by agency but are generally modest by federal contract standards.

The goal is to answer: can the proposed approach work technically? Phase I produces a final report and forms the basis for Phase II proposal eligibility.

Phase II — Development

Funding to develop the technology to prototype or production stage. Awards typically last 24 months. Phase II funding is substantially larger than Phase I — often 5–10x the Phase I award.

Only firms that completed a Phase I award are eligible for Phase II in the same topic area. The Phase II proposal builds on the Phase I results and details the full development plan.

Phase III — Commercialization

Phase III is the commercialization stage. Critically, Phase III work derived from a prior SBIR/STTR award can be procured by any federal agency without further competition — meaning a successful Phase II winner can convert into substantial follow-on production or services contracts at the original or any other federal agency.

Phase III funding does not come from the SBIR/STTR set-aside budget. It comes from the buying agency's regular procurement budget and is awarded under a contract or other vehicle.

Eligibility

SBIR and STTR have specific eligibility requirements that go beyond the standard small business definition:

For-profit small business. Generally fewer than 500 employees, including affiliates.
U.S. ownership. At least 50% U.S.-owned and operated, with specific rules about ownership by other U.S. small businesses or, since recent reforms, by qualifying venture capital firms.
Principal investigator. For SBIR, the PI's primary employment must be with the small business at the time of award. For STTR, the PI may be employed by either the small business or the research institution partner.
Place of performance. Generally must be in the United States.
Registration. Active SAM.gov registration and registration with the SBA's SBIR.gov portal.

Participating agencies and differences

Eleven agencies run SBIR programs. The five largest by funding are DoD, HHS (primarily NIH), NASA, DOE, and NSF. Five of the eleven also operate STTR. Agencies differ substantially in approach:

DoD. Issues solicitations tied to specific operational and technology needs. Most DoD SBIR is contract-based, with topic-specific Phase I solicitations released on a recurring cadence. Strong emphasis on commercialization path through Phase III.
NIH. Funds biomedical and health-related research. NIH SBIR/STTR uses grant-based mechanisms and a different proposal format from DoD. Phase II awards can be substantially larger than DoD norms.
NASA. Tied to mission technology needs in aeronautics, space, and exploration. Strong technology transfer culture.
DOE. Energy technology focus, including basic research at DOE labs.
NSF. Broad scope across deep-tech innovation; emphasis on commercialization potential.

Agencies maintain their own SBIR/STTR sites, solicitation calendars, and proposal templates. Cross-agency proposals are uncommon; firms typically target one or two agencies whose topic areas align with their technology.

Phase III sole-source authority

The single most consequential feature of SBIR/STTR is Phase III sole-source authority. Under the program statute and FAR coverage, any federal agency may award a Phase III contract to an SBIR/STTR awardee for work derived from the prior SBIR/STTR project — without competition. This authority extends across agencies; an Army SBIR Phase II awardee can receive a Phase III contract from the Navy, the Air Force, or a civilian agency.

Phase III is what turns SBIR/STTR from an R&D funding program into a business development vehicle. Many successful SBIR firms structure their entire federal go-to-market around the Phase III sole-source path: pursue Phase I, win Phase II, document the work carefully to establish Phase III derivation, and then sell into agencies that can buy without re-competing.

Phase III is not automatic. The buying agency must determine that the work derives from the SBIR/STTR project and that the awardee is the appropriate source. Documenting the connection between Phase II work product and the proposed Phase III scope is the key compliance task.

How SBIR/STTR stacks with other set-asides

SBIR/STTR is a separate program from standard set-asides. A firm can hold:

SBIR/STTR awards plus 8(a), SDVOSB, WOSB, or HUBZone certifications
SBIR/STTR Phase III contracts that may also be counted toward agency small business goals
SBIR/STTR awards in parallel with traditional federal contracts under other contract types

The interaction with standard small business certifications is generally additive — SBIR/STTR provides a research-funded path to develop the technology, and the set-aside certifications provide additional preference paths for commercial contracts.

Intellectual property rights

SBIR/STTR data rights are unusually favorable to the awardee. The government generally receives only a limited license to the technical data and computer software developed under the award for a specified protection period. The awardee retains commercialization rights and can market the technology outside the federal government during and after the protection period.

These rights are protected by specific data rights legends that must be applied correctly to deliverables. Failure to mark data correctly can result in inadvertent transfer of broader rights to the government. The marking discipline is one of the most important administrative tasks for SBIR/STTR awardees.

Common mistakes

Treating SBIR as a grant program. Most SBIR awards (especially at DoD) are contracts with all the associated administration. Grant-style assumptions cause compliance problems.
Weak Phase I commercialization narrative. Even Phase I proposals are evaluated partly on commercialization potential. A proposal that treats commercialization as an afterthought scores lower.
Missing Phase III opportunities. Many firms complete Phase II without actively positioning for Phase III. The sole-source authority disappears if not used.
Data rights marking failures. Forgetting to mark technical data and computer software with the proper legends can result in lost commercialization rights.
Cross-funding the same work. Receiving both SBIR funding and another federal source for the same scope is not allowed without specific authorization.
Treating university partners casually. For STTR, the research institution partnership is required and must produce real collaboration evidence — not paper participation.

SBIR and STTR Programs