STTR vs SBIR: Full Comparison for 2026

Side-by-side comparison

The 30% rule explained

STTR's defining feature is the work-share split. In both Phase I and Phase II, the small business must perform at least 40% of the effort, and the qualified research institution must perform at least 30%. The remaining 30% can be split between the two, allocated to subcontractors, or assigned to consultants. This is enforced by the agency contracting officer at the proposal stage and audited during performance.

Practical consequences:

• The research institution partner is a genuine performer, not a check-the-box endorser.
• Budget allocation is constrained. You cannot put the institution partner at 10% and the small business at 80%.
• Subcontracting is limited; after small business (40%) and institution (30%), only 30% remains for other performers.
• Cost volume must clearly show the 40/30 split.

What counts as a "qualified research institution"

STTR defines qualified research institutions narrowly:

1. Nonprofit colleges or universities.
2. Domestic nonprofit research organizations.
3. Federally Funded Research and Development Centers (FFRDCs).

Government labs (DoD labs, DOE national labs) do not count as qualified research institutions for STTR. They can be subcontractors on SBIR or STTR but cannot satisfy the 30% partner requirement in STTR.

The institution must have an active SAM.gov registration and must be willing to sign the STTR IP agreement. Many university Offices of Sponsored Research have standard templates.

IP ownership mechanics

STTR requires a written Allocation of Rights agreement between the small business and the research institution before the award is signed. The SBA provides a model allocation that most universities accept. Key provisions typically negotiated:

• Foreground IP (created during the project): Usually assigned to the small business, with the institution retaining march-in rights for continued research and education use.
• Background IP (pre-existing): Each party retains ownership of its pre-existing IP; licenses are granted as needed for project performance.
• Publication: Institution retains some publication rights, often subject to a small-business review window (30-90 days) to protect patent filings.
• Royalty sharing: Institution often receives a royalty on downstream commercial revenue derived from the project, typically 1-5% for a limited term.

Small businesses sometimes balk at royalty provisions. In practice, a well-structured STTR agreement preserves commercial upside for the small business while giving the institution a fair return for its research contribution. Firms that treat the institution as an adversary during negotiation regret it during execution.

SBIR IP: simpler in structure

SBIR IP is simpler because there is no mandatory institutional partner. The small business owns all foreground IP it creates. It asserts SBIR Data Rights under DFARS 252.227-7018 (for DoD) or the equivalent civilian clause. The government receives restricted rights in software and limited rights in technical data during the 20-year SBIR Data Rights period.

Where SBIR subcontracts with a university or nonprofit (up to 33% in Phase I, 50% in Phase II), the small business typically includes IP assignment language in the subcontract. This is less elaborate than the STTR Allocation of Rights but still important to get right.

When to pick STTR

• You have a research advisor, former grad school PI, or lab collaborator whose lab genuinely owns key expertise in the problem area.
• The underlying technology requires fundamental research that a small business cannot credibly perform alone at Phase I fidelity.
• The topic is in a domain (basic science, biomedical research, materials science) where reviewers expect to see university-level research capability.
• The institution partner has a long track record of technology transfer and is organizationally ready to execute an STTR.
• The PI arrangement genuinely benefits from the flexibility to have a PI at the institution while the small business executes commercialization.

When to pick SBIR

• Your small business has the expertise to execute the feasibility study without university support.
• The technology is closer to product than research — engineering execution matters more than fundamental science.
• You want cleaner IP ownership without a royalty-sharing arrangement.
• You want to minimize institutional overhead costs (universities often charge 50-70% indirect rates, which push STTR budgets toward labor-heavy institution shares).
• You do not have an established relationship with a qualified research institution willing to partner on short timelines.
• You want the broader set of participating agencies (SBIR has 11, STTR has 5).

Which agencies run STTR

Only five agencies participate in STTR:

• Department of Defense (DoD). Army, Navy, Air Force, DARPA, Space Force, SOCOM, and other components run STTR topics alongside SBIR topics in each cycle. Submit through DSIP.
• National Institutes of Health (NIH). STTR is well-established in biomedical research. Submit through eRA Commons / Grants.gov.
• National Science Foundation (NSF). NSF STTR uses the same Research.gov Project Pitch process as SBIR.
• Department of Energy (DOE). STTR topics are published alongside SBIR topics in the DOE SBIR/STTR solicitation through DOE PAMS.
• NASA. STTR topics are published in NASA's annual solicitation through NSPIRES.

The other six SBIR agencies (USDA, DHS, DOT, EPA, Department of Education, Department of Commerce) do not currently run STTR programs. If your target topic area lives at USDA or DHS, SBIR is a direct option.

Proposal structure differences

SBIR and STTR proposals use nearly identical structures. The STTR proposal adds:

• Research institution section. Description of the institution, its role in the project, and its qualifications.
• Cooperative research and development agreement / MOU. Signed document between the small business and the institution.
• Allocation of Rights agreement. Either complete at submission or committed to before award.
• Joint PI identification. If the PI is at the institution, identification and justification.
• Work-share table. Explicit table showing the 40/30/remaining split with dollar amounts and task allocations.

Cost volume differences

STTR cost volumes are more complex than SBIR because the institution's indirect rate and fee structure differ from the small business's. A typical STTR Phase I cost volume has two parallel cost stacks:

1. Small-business stack. Direct labor, fringe, overhead, G&A, fee.
2. Institution stack. Institution direct costs, institution indirect rate (often 50-70% MTDC), typically no fee (universities do not take profit).
3. Consolidated total. Sum of both stacks reconciles to the award ceiling.

Universities often have federally negotiated indirect rates. These are non-negotiable; the university is legally required to charge its full federally negotiated rate on federal awards. This is a significant cost driver for STTR and one reason STTR project budgets tilt heavier on institution share than the 30% floor.

Selection rates and competition

STTR typically receives fewer applications per topic than SBIR. This modestly increases the selection rate per compliant proposal, but the benefit is offset by the institution-partner coordination overhead. Empirical selection rates:

• DoD STTR Phase I: ~15-25% across components.
• NIH STTR Phase I: ~15-20%, similar to NIH SBIR.
• NSF STTR Phase I: ~12-18%.

The practical lesson: do not pick STTR for the win rate. Pick STTR because the partner is genuinely the right shape for the work.

Phase III: identical rules

Both SBIR and STTR confer the same Phase III sole-source authority under 15 U.S.C. 638(r). There is no difference in commercialization authority between the two programs. The 20-year SBIR Data Rights protection period applies identically.

Common STTR failures

• Institution partner is not actually ready. A letter from a lab PI is not the same as an Office of Sponsored Research willing to execute on short timelines.
• 30% floor becomes 60% in practice. Without active budget management, university indirect rates and institution direct costs inflate institution share beyond planned ratios, crushing the small business's share.
• Allocation of Rights negotiated in the last week. Universities typically need 4-8 weeks to clear an IP agreement. Starting late causes missed deadlines.
• PI role mismatched. If the PI is a tenured professor with 5% LOE on the grant, the small business is effectively running the project alone while paying the institution's full overhead. Pick your PI structure deliberately.

Decision framework

A simple framework for picking between the two on a specific topic:

1. Does the topic require fundamental research beyond what your small business can credibly execute? If yes, STTR.
2. Do you already have a functioning relationship with a qualified research institution? If yes, STTR is more accessible.
3. Is the topic at an agency that runs STTR? If no, SBIR is a direct path.
4. Do you want cleaner IP ownership? If yes, SBIR.
5. Does the cost profile of the institution's indirect rate fit the award ceiling? If no, reconsider STTR.

When in doubt, default to SBIR. STTR is the right choice when the research partner is genuinely central to the technical approach, not when it is a nice-to-have.

FAQ

What is the main difference between SBIR and STTR?

STTR requires a qualified research institution partner that performs at least 30% of the work. SBIR does not.

What is the 30% rule in STTR?

In STTR Phase I and Phase II, the research institution must perform at least 30% of the work and the small business must perform at least 40%. The remaining 30% can be allocated flexibly.

Do STTR and SBIR offer the same award amounts?

Yes. Both use identical statutory ceilings: up to $314,363 for Phase I and up to $2,095,748 for Phase II in 2026.

Which program has better IP ownership for the small business?

Both grant SBIR Data Rights to the small business. STTR requires a written Allocation of Rights agreement with the institution. With a well-drafted agreement, small-business IP upside is preserved in both programs.

Which program is easier to win?

Win rates are similar. STTR sometimes sees slightly higher selection rates due to fewer applications, but the partnership coordination offsets the advantage.

Can I switch from STTR to SBIR between Phase I and Phase II?

Generally no. Phase II follows Phase I on the same program. Some agencies permit exceptions under specific conditions; most do not.

Is a government lab a qualified research institution for STTR?

No. Federal labs (DoD labs, DOE national labs) are not qualified research institutions under STTR. They can be subcontractors but cannot fill the 30% partner role. Qualified institutions are nonprofit universities, domestic nonprofit research organizations, and FFRDCs.

Does STTR have Phase III sole-source authority?

Yes. Phase III rules are identical across SBIR and STTR under 15 U.S.C. 638(r).

Related resources

• SBIR-Ready Checklist
• SBIR Phase I Guide
• SBIR Phase II Guide
• SBIR Phase III Guide
• SBIR Partnering