Direct comparison
SBIR Phase I vs. Phase II Compared
Compare SBIR Phase I and Phase II: duration, government-wide award ceilings, and why Phase II eligibility generally requires a completed Phase I award.
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How do SBIR Phase I, SBIR Phase II compare side by side?
The table below compares SBIR Phase I, SBIR Phase II across 8 procurement-relevant dimensions, from purpose through what comes after.
Side-by-side comparison
| Dimension | SBIR Phase I | SBIR Phase II |
|---|---|---|
| Purpose | Establish technical merit, feasibility, and commercial potential of an idea -- proof of concept, not a finished product. | Full research and development toward a working prototype, building directly on the technical results demonstrated in Phase I. |
| Typical duration | Roughly 6 to 12 months, depending on the agency (some agencies, e.g. USDA, run an 8-month period). | Up to about 24 months (two years) -- longer than Phase I at every SBIR/STTR agency. |
| Government-wide statutory guideline ceiling (2026) | Up to $323,090 (including modifications), the SBA-published guideline that agencies can exceed only with an SBA waiver. | Up to $2,153,927 (including modifications) -- the same statutory guideline mechanism, roughly 6.7x the Phase I ceiling. |
| What agencies actually award in practice | Most agency-specific Phase I awards fall well under the statutory ceiling -- for example NSF funds Phase I up to $305,000 and USDA/NIFA up to $175,000 (or $125,000 for select topics). | sbir.gov's own FAQ characterizes the ordinary case as normally not exceeding $1,000,000 over about two years; individual agencies set their own figures within the statutory ceiling -- NSF funds Phase II up to $1,250,000, USDA/NIFA up to $600,000. |
| Eligibility | Open to any qualifying small business responding to a solicitation topic -- no prior SBIR award on the project required. | Generally restricted to firms that completed a Phase I award on the same research topic (per sbir.gov's FAQ: 'Generally, only Phase I awardees are eligible for a Phase II award'). A small number of agencies (historically NIH, DoD, and the Department of Education) offer a Direct-to-Phase-II pathway for firms that can document Phase I-equivalent feasibility using non-SBIR funds; NSF does not offer this and requires the standard Phase I-to-Phase II lineage. |
| Minimum work performed by the small business | At least two-thirds of the research and/or analytical effort. | At least one-half of the research and/or analytical effort -- meaning up to roughly half of a Phase II project's funded work can be subcontracted, commonly to a university lab under a tech-transfer or sponsored-research agreement. |
| Competitive process | Competes against other Phase I proposals responding to the same solicitation topic. | A separate proposal, competitively reviewed on its own merits (including how well Phase I results support the case for further development) -- completing Phase I is a prerequisite to apply, not a guarantee of a Phase II award. |
| What comes after | A successful Phase I outcome is the basis for a Phase II application, but the small business must still submit and win a competitive Phase II proposal. | Phase III -- commercialization, using non-SBIR funds (private capital, follow-on non-SBIR federal contracts, or licensing). Phase III is not itself SBIR-funded, though agencies can award Phase III work sole-source, without further competition, citing the prior SBIR/STTR effort. |
Common questions
Common questions about SBIR Phase I vs SBIR Phase II
Can a company apply for SBIR Phase II without first winning Phase I?
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Generally no. Per sbir.gov's own program FAQ, only Phase I awardees are typically eligible for a Phase II award on that project. A limited Direct-to-Phase-II pathway exists at some agencies (historically NIH, DoD, and the Department of Education) for companies that can document Phase I-equivalent feasibility work funded outside SBIR -- NSF does not offer this exception. Which agencies currently offer Direct-to-Phase-II changes between solicitation cycles, so check the specific agency's current SBIR/STTR page before assuming a pathway is available.
Is winning Phase I a guarantee of winning Phase II?
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No. Phase II is a separate proposal that goes through its own competitive review, evaluated in part on how well the Phase I results support further development. Completing Phase I successfully is a prerequisite to apply for Phase II, not an automatic follow-on award.
Why is Phase II funded at a much higher amount than Phase I?
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Phase I funds a short feasibility/proof-of-concept effort; Phase II funds the substantially larger scope of building and testing a working prototype over roughly twice the duration. The government-wide statutory guideline ceilings reflect that difference in scope -- Phase II's ceiling is roughly 6.7 times Phase I's as of the current 2026 guideline figures.
Do Phase I and Phase II have the same subcontracting limits?
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No. Phase I requires the small business to perform at least two-thirds of the work itself, leaving less room to subcontract. Phase II loosens that requirement to at least one-half, which is why Phase II projects more commonly include a university subcontract or subaward to the small business's academic collaborator.
Going deeper
