The question behind the question
A faculty member almost never asks "SBIR or STTR" as an abstract policy question. The real question is narrower and more practical: my lab has something worth funding, a company has approached me or I am thinking of starting one, and I want to know which program lets me keep my appointment, keep my students funded, and keep the rights that matter. That question has a clean answer, and the answer turns on four things: who employs the principal investigator, how the work must be split, how money reaches the department, and what happens to facilities-and-administrative cost recovery. Everything else is detail.
Both programs come from the same statute, 15 U.S.C. 638, and both are administered under the SBA SBIR and STTR Policy Directive. Both are three-phase structures: Phase I proves feasibility, Phase II builds and demonstrates, Phase III commercializes with non-SBIR dollars. Both require the work to be performed in the United States. Both require a small business concern to hold the award. Neither program can be won by a university on its own, and that single fact is the one most campus conversations skip past.
The size difference matters for planning. SBIR is funded by a 3.2 percent set-aside of each participating agency's extramural R&D budget, across eleven agencies. STTR is funded by a 0.45 percent set-aside across five: the Department of Defense, Health and Human Services, the Department of Energy, NASA, and the National Science Foundation. STTR is roughly one-seventh the size of SBIR in dollars, and it has fewer subject areas open in any given cycle. Fewer proposals compete for those dollars, which is why the arithmetic on a well-matched STTR is often better than the raw dollar totals suggest.
Who must employ the PI — the fork that decides most cases
This is the rule that settles the majority of faculty decisions before any other consideration is reached.
SBIR. The principal investigator's primary employment must be with the small business concern at the time of award and for the duration of the project. Primary employment means more than one-half of the PI's time. A tenured or tenure-track professor carrying a full appointment cannot meet that standard while remaining on the university payroll at full effort. There are ways to structure around it, most commonly by naming a company-employed PI and bringing the faculty member on as a co-investigator or consultant through a subaward, but the PI of record has to be the company's person.
STTR. The PI may be primarily employed by either the small business or the partnering research institution. Primary employment is not stipulated. A faculty member can sit at the university, keep the appointment, and be the named principal investigator on a federal STTR award held by a small business. This is the reason STTR exists, and it is the single most useful fact a department chair can know.
Everything downstream follows from that. If a lab's intellectual center of gravity is the faculty member, and that faculty member intends to stay a faculty member, STTR is the program. If the science has already walked out the door with a graduate student or postdoc who now works at the company full time, SBIR is usually cleaner and the university becomes a subcontractor rather than a formal partner.
Program fit signals — reading a lab's current state
Higher bars lean STTR; lower bars lean SBIR with a university subaward. Editorial weighting, not a measured statistic.
Work share: the floors are not suggestions
Both programs put a floor under how much of the research the small business performs, and STTR adds a floor under the research institution's share. These percentages are measured against the total budget of the effort, and contracting officers check them.
Under SBIR, the small business must perform at least two-thirds of the research in Phase I and at least one-half in Phase II. That leaves at most one-third of a Phase I budget available for a university subaward, and up to one-half in Phase II. Under STTR, the small business performs at least 40 percent and the research institution at least 30 percent, in both Phase I and Phase II. The remaining 30 percent is unallocated and can go to either party or, with care, to a third. That floating 30 percent is where most STTR budgets are actually negotiated, and a university that brings a facility, an instrument, or a cohort of students can reasonably argue for a large share of it.
| Dimension | SBIR | STTR |
|---|---|---|
| PI employment | Primary employment with the small business, more than half time | Either the small business or the research institution |
| University role | Optional subawardee, capped by work share | Required formal partner named in the proposal |
| Small business floor | Two-thirds Phase I, one-half Phase II | 40 percent, both phases |
| Institution floor | None; ceiling of one-third in Phase I | 30 percent minimum, both phases |
| Participating agencies | Eleven | Five: DoD, HHS, DOE, NASA, NSF |
| Required agreement | Standard subaward or subcontract | Written cooperative agreement plus an allocation of rights agreement before award |
One more eligibility fact belongs here. The research institution in an STTR must be a United States entity in one of three categories: a nonprofit college or university, a domestic nonprofit research organization, or a federally funded research and development center. A national laboratory operated as an FFRDC qualifies. A foreign campus of a U.S. university does not, and a for-profit research arm does not.
How the money actually reaches your department
In both programs the small business is the prime recipient. The federal instrument runs to the company, and the company issues a subaward to the university. Money does not flow from the agency to the campus. That inversion surprises faculty who have spent careers as prime recipients on NSF and NIH grants, and it changes three practical things.
Invoicing and cash flow. The university invoices the company, and the company invoices the government. Sponsored programs offices are used to this, but the payment cadence is the company's cadence, not the agency's. A well-run small business pays subaward invoices on a fixed monthly cycle and does not make the department wait for federal reimbursement. That question is fair to ask in the first conversation.
Reporting. Technical and financial reporting flows down through the subaward. The company owes the agency; the university owes the company. The faculty member writes the technical substance and the company assembles, formats, and files it.
Fee. Federal SBIR and STTR awards permit the small business to take a reasonable fee or profit, commonly around seven percent at DoD. Universities do not take fee. That is not a slight; it reflects that the small business carries commercialization risk, audit exposure, and the obligation to deliver. It also means the number a department sees is the number the department receives, with no profit layer skimmed from the campus share.
Indirect cost: the part worth reading twice
F&A treatment is where good STTR partnerships are won or lost, because a university that assumes its full negotiated rate will apply and a company that assumes it will be waived are both about to have a bad conversation.
Start with the rule. A university with a negotiated indirect cost rate agreement is entitled to charge that rate on the work it performs under a federal subaward. That principle sits in the Uniform Guidance at 2 CFR 200.414, and for contracts it comes in through the cost principles for educational institutions, which point back to 2 CFR part 200 subpart E. Nobody has to give up a NICRA to participate in an STTR. Whether the on-campus or off-campus rate applies depends on where the work is done, which is a real decision when a project moves between a campus facility and a company site.
The interesting arithmetic is on the company's side of the ledger. Modified total direct cost, defined at 2 CFR 200.1, counts only the first $50,000 of each subaward. The 2024 revision to the Uniform Guidance raised that threshold from $25,000, and raised the de minimis indirect rate at 2 CFR 200.414(f) from 10 to 15 percent for recipients without a negotiated rate. In plain terms: the small business does not recover indirect cost on the bulk of a large university subaward. The company absorbs that. It is one reason a partner who agrees to a 30 or 40 percent campus share is making a real commitment, not just moving numbers around a spreadsheet.
Agency practice varies on the company side. NIH lets an SBIR or STTR firm without a negotiated rate use up to 40 percent of modified total direct costs for indirect. DoD contracting generally expects provisional rates supported by an accounting system that can survive review. None of that constrains the university's rate, but it does constrain how much room exists under a fixed award ceiling. Compare notes before the budget is built.
Fielded prototype versus early research
Set the regulations aside for a moment and look at the science.
Early research fits STTR. A method that works on a benchmark, a mechanism established in three papers, a dataset the lab built and nobody else has: this is exactly what the STTR mechanism was written for. The federal side wants the university's fundamental work moved toward use, and the 30 percent institutional floor guarantees the lab is funded to keep doing what it is good at while the company handles integration, packaging, security controls, and the customer.
A fielded prototype fits SBIR. If hardware already exists, if software already runs at a customer site, if the remaining questions are about scale, reliability, accreditation, and transition rather than about whether the science works, SBIR is the better instrument. The company can carry two-thirds or more of the effort honestly, and the university comes in as a subcontractor for a specific piece: an independent evaluation, a materials characterization, a human-subjects protocol, an instrument nobody else has.
The mixed case is common. A lab with a strong core method and a partner with a working system around it can go either way. Then the decision reverts to the PI employment rule and to which agency has an open window with a matching subject area, which a short conversation and a scan of current solicitations settles.
From first conversation to submitted STTR
Intellectual property, in the order it comes up
The STTR program requires a written allocation of rights agreement between the small business and the research institution, executed before award. Agencies publish model agreements and technology transfer offices are familiar with them. The agreement covers ownership of inventions made under the project, licensing terms for background intellectual property the lab brings in, and follow-on rights.
Underneath that sits Bayh-Dole, 35 U.S.C. 200 through 212, implemented at 37 CFR part 401. A university electing title to a subject invention keeps it, subject to the government's nonexclusive license and to reporting through the interagency invention system. Small businesses have the same election rights. Where the two meet is in the license: a company that will spend Phase II and Phase III money commercializing a lab's invention normally wants an exclusive license in a defined field of use, and that negotiation belongs to the technology transfer office rather than to the proposal.
Data rights are separate from patent rights and are frequently confused with them. Under the SBIR and STTR data rights clause used at DoD, the government receives limited rights in data generated under the award for a protection period of 20 years from the date of award. That protection attaches to the award, meaning the company that holds it. Faculty who intend to publish should raise publication timing early; the standard accommodation is a short agency or company review window before submission, not a restriction on publishing.
One last item that catches people: financial conflict of interest. Institutions that receive Public Health Service funding operate under 42 CFR part 50 subpart F, and a faculty member holding equity or an officer role in the partnering company triggers disclosure and a management plan. That is routine. Discovering it three days before a deadline is not.
What to check before you say yes
- Confirm the company's SAM.gov registration is active and its SBIR eligibility is clean under 13 CFR 121.702, meaning majority U.S. ownership and control and fewer than 500 employees including affiliates.
- Ask who the named PI will be and, if it is you, confirm the effort commitment your department will approve.
- Get the work-share split in writing before the budget is built, not after the technical volume is drafted.
- Send the allocation of rights agreement to technology transfer in week one; it is the longest-lead item on campus.
- Ask about invoice payment cadence and whether the company pays subaward invoices before federal reimbursement arrives.
- Confirm on-campus versus off-campus F&A with your sponsored programs office based on where the work will physically happen.
- Ask what happens in Phase III, where sole-source follow-on authority runs to the small business awardee and the university's position depends entirely on the license.
What a serious partner brings
The company side of an STTR is not administrative overhead attached to a lab. Our team builds the production system around the science: the data pipeline, the model training and evaluation stack, the deployment target, the security controls, the accreditation path, and the interfaces the eventual customer will actually touch. We write the technical volume, run the compliance checks, carry the cost volume and the accounting, and handle the agency correspondence. The lab's job stays the lab's job.
Our engineers, licensed professional engineers, and domain specialists work across defense, health, energy, transportation, and public-sector data, and the firm is led by a former professor in technology, so the campus half of the conversation is familiar ground. Precision Federal is SAM.gov active, CAGE 1AYQ0, and JCP / DD-2345 certified, which matters when a subject area involves export-controlled technical data and a university needs to know its partner can hold it properly.
A good STTR partner makes the proposal stronger than the lab could make it alone and makes execution lighter than the lab expects. If that is not happening, the partnership is not worth the routing time.
Frequently asked questions
No. Both programs require a small business concern to be the prime recipient. In STTR the university is a required formal partner with a guaranteed minimum share of the work; in SBIR the university can participate as a subawardee within the work-share cap.
On STTR, yes. The PI may be primarily employed by either the small business or the research institution. On SBIR the PI's primary employment must be with the small business, meaning more than half of that person's time, so a full appointment is generally incompatible with being the SBIR PI of record.
Yes. A negotiated rate agreement applies to work the institution performs under a federal subaward, per 2 CFR 200.414 and the cost principles for educational institutions. Whether the on-campus or off-campus rate applies depends on where the work is performed.
In STTR the research institution's floor is 30 percent of the effort in both Phase I and Phase II, with another 30 percent unallocated and negotiable. In SBIR the ceiling for outside performers is one-third in Phase I and one-half in Phase II.
Ownership follows the required allocation of rights agreement between the small business and the research institution, executed before award, and underneath it Bayh-Dole at 35 U.S.C. 200–212 and 37 CFR part 401. Data rights are separate; the SBIR and STTR data protection period at DoD runs 20 years from the date of award.