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SBIR vs STTR: which program fits when you already have a university collaborator

Andrew T. Flowers ·

Founders who already work with a professor often assume the Small Business Technology Transfer (STTR) program is the one to choose, because STTR is the one that requires a research-institution partner. It isn't always the right call. The Small Business Innovation Research (SBIR) program allows a university partner too, and 46% of SBIR Phase II respondents in a National Academies survey reported a university connection of some kind. So the collaborator doesn't decide the program. Choose STTR when the university will do at least 30% of the work, your agency has an STTR topic that fits, its PI rule suits your team, and you're ready to sign a rights agreement before you submit. Otherwise SBIR usually fits better. The decision table is below.

This post goes deeper on one question from our guide to SBIR and STTR university partners. In the Helikon Method, the choice spans Match and Unite. The rules come from the SBA's SBIR and STTR Policy Directive, and the April 2026 reauthorization didn't change them.

Why doesn't a university collaborator settle the question?

Because both programs make room for one. In the Academies survey of Phase II recipients, where 266 STTR and 1,795 SBIR respondents answered the question on university links, a research institution was a subcontractor on 25.8% of SBIR projects, and faculty held a non-PI role on 26.0%. When Link and Ruhm (2009) found that university involvement increased the probability of commercialization, they were studying NIH SBIR awards, not STTR. An analysis of SBIR firms by Siegel and Wessner (2012) found the same direction: start-ups with closer ties to universities performed better.

So the question isn't whether a university can take part. It's whether it has to, how much it does, and what's signed before you submit.

Where will the principal investigator work?

On an SBIR, the PI's primary employment, meaning more than half their employment time, has to be with the small business at award and throughout the project. A professor with a full-time appointment can't lead an SBIR, though their university can join as a subcontractor, with them as key personnel.

On an STTR, the directive lets the PI's primary employment sit with either organization. Agencies add their own rules, though, and NIH and NSF don't agree:

  • NIH allows an STTR PI at the research institution who gives the project at least 10% of their time and has a formal appointment with, or commitment to, the small business (NIH Grants Policy Statement 18.5).
  • NSF requires the PI to be primarily employed (at least 51%) by the small business on both programs, and requires an STTR co-PI from the partner research institution (NSF 26-510).

So if you're drawn to STTR because your collaborator should lead, that reason holds at NIH but not at NSF. If someone at your company will lead anyway, the PI rule doesn't favor STTR.

Translation Box: principal investigator

On the academic side: the faculty member who leads a funded project and answers to the sponsor for the science.

On the industry side: the technical lead named on the proposal, and under SBIR, someone the company employs more than half time.

In this post: the person the agency's PI rule applies to, which is why the name on the cover page can decide the program.

How much of the work does the university need to do?

SBIR sets a ceiling. The small business does at least two-thirds of the effort in Phase I and at least half in Phase II, leaving up to a third, then up to half, for the university and other subcontractors. The funding agreement officer can approve a deviation in writing, but don't plan on one.

STTR sets a floor. The small business does at least 40% and the research institution at least 30%, and because the split is set by statute, no deviations are allowed. A university running measurements worth 15% of the budget doesn't fit STTR. A university doing half the Phase I work doesn't fit an SBIR Phase I without a deviation.

Agencies measure the split by award dollars or labor hours, and the solicitation says which. Run your numbers that way, with the university's indirect costs on its side of the line, and check Phase I and Phase II separately.

Where did the technology come from?

If the core idea came out of the professor's lab, STTR is the more natural fit, and that's the pattern in the Academies data. The technology originated at the research institution on 29.3% of STTR projects against 11.1% of SBIR projects, and was licensed from it on 18.4% against 6.9%. The report calls these data descriptive only, so read them as a picture of who uses each program.

When the university owns the starting technology, you'll need its agreement on follow-on rights anyway, and STTR makes you settle that up front. When the technology is yours and the university adds a capability, such as an instrument or a test method, SBIR with a subaward is often simpler.

Does your agency run STTR, and how big is the pool?

SBIR runs at 11 agencies and STTR at six: USDA, Defense, Energy, HHS (including NIH), NASA, and NSF. If your topic sits at Commerce, Education, Homeland Security, Transportation, or EPA, SBIR is your only option (Congressional Research Service).

Where both exist, STTR is the smaller pool. The set-aside is 3.2% of extramural R&D for SBIR and 0.45% for STTR, and in FY2022 agencies obligated $4.4 billion through SBIR and $662.3 million through STTR (CRS). NSF estimates about 180 SBIR Phase I awards per year against about 50 for STTR (NSF 26-510).

How much management can both sides take on?

In the Academies survey, 45% of the 211 respondents who'd received both SBIR and STTR awards said STTR was harder to manage than SBIR, and about 3% said it was easier. Yet 71% of STTR respondents said the award enhanced their relationship with the institution.

Much of that effort sits in one document. Before an STTR award, the small business has to negotiate a written allocation of rights agreement with the research institution, settling at a minimum who owns inventions, who may file patents, and who may continue the research. The directive says the small business submits it with the proposal and certifies that it's satisfactory, so check your solicitation for exactly what it asks for and when. SBA provides a model agreement to start from.

SBIR has no such requirement. The university's IP terms go into the subaward. That's still a real negotiation, since a university can elect to keep title to inventions its people make with federal funding (35 U.S.C. 202), but it's one negotiation instead of two. We cover the STTR agreement clause by clause in The STTR allocation of rights agreement, explained for founders.

Why is the choice more important now?

The 2026 reauthorization requires every agency to limit the number of proposals a small business can submit, counted per fiscal year, per solicitation, or per topic, by FY2027 at the latest (S. 3971). Some agencies started early. HHS, which includes NIH, now accepts at most nine Phase I, Fast-Track, and Direct to Phase II applications from one company per fiscal year. Once a cap applies, a proposal sent to the wrong program uses up one of a limited number of submissions. Check how your agency counts, and settle the program with your collaborator before anyone starts writing.

Which program fits? The decision table

Factor Choose SBIR when... Choose STTR when...
Who leads The PI is primarily employed by your company Your agency lets the PI sit at the university (NIH does, with at least 10% effort), or you want a university co-PI at NSF
University's share of the work Up to a third in Phase I, or up to half in Phase II At least 30%, with your company doing at least 40%
Room to adjust the split You might need a deviation, approved in writing by the funding agreement officer Your split clears both minimums with margin, since no deviations are allowed
Where the technology came from Your company owns it and the university adds a capability It originated in the university lab and follow-on rights need settling up front
Agency Your topic sits at Commerce, Education, Homeland Security, Transportation, or EPA, or the SBIR topic fits better Your agency is USDA, Defense, Energy, HHS, NASA, or NSF and has an STTR topic that fits
Number of awards You want the larger program (at NSF, about 180 Phase I awards per year) The STTR topic fits closely enough to compete for fewer (at NSF, about 50)
IP agreement You'd rather carry IP terms in the subaward and negotiate once Both sides are ready to sign an allocation of rights agreement before you submit
Management capacity Your team is small and the deadline is close Both sides have time to negotiate, ideally building on an existing relationship

The first three rows and the agency row are rules, and the rest are judgment. If a rule excludes a program, the other rows don't matter. Our free SBIR and STTR partner readiness checklist puts everything that needs agreeing in one document, and if your collaborator is weighing their role, see What to offer a professor when you ask them to join your SBIR or STTR proposal.

Where should you start?

With your collaborator's record, and a look at who else could do the work. On the Helikon platform, you can paste your specific aims into Partner search, which matches researchers to your research problem with a match score and the reason for it, and it's unlimited on the free plan. A researcher's Funding tab lists the awards they've published on, so you can see who's been a research-institution partner on a small-business award before. Once you've chosen, set the proposal up as a project with the SBIR/STTR agreement type, its timeline, budget, and contract requirements. Discover's Funding tab carries the SBIR and STTR solicitations Grants.gov lists.

Helikon Labs helps you find your partner, agree to terms, and run the research collaboration.

Start free on Helikon Labs

If you'd like to talk the choice through first, book a free 30-minute scoping call.

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SBIR vs STTR: which program fits when you already have a university collaborator · Helikon Labs