NSF 26-510: SBIR/STTR Phase I, Phase II, and Fast-Track Funding for Deep Technologies (2026 and recurring deadlines)

NSF 26-510: SBIR/STTR Phase I, Phase II, and Fast-Track Funding for Deep Technologies (2026 and recurring deadlines)

NSF 26-510 is an active program solicitation from the U.S. National Science Foundation for its Small Business Innovation Research and Small Business Technology Transfer programs. The official page calls this the current version and identifies it as an active funding opportunity. It covers Phase I, Phase II, Fast-Track, and several supplemental paths for startups and small businesses developing high-risk technologies with commercial potential. The solicitation is housed within NSF’s Directorate for Technology, Innovation and Partnerships and is titled “Developing Deep Technologies that Advance U.S. Competitiveness and Security.”

The July 27, 2026 full-proposal deadline has passed. The next listed deadline is November 4, 2026, at 5 p.m. in the submitting organization’s local time. The solicitation also lists March 4, 2027 and July 7, 2027. After those listed dates, NSF describes an annual pattern: the first Wednesday in November, the first Thursday in March, and the first Wednesday in July. This page therefore remains a live opportunity listing rather than a historical archive. The front-matter deadline is the next listed date, while the earlier and later dates are explained below so applicants can plan around the official schedule.

Key details table

What makes NSF 26-510 different from other funding calls

NSF 26-510 is an umbrella-style solicitation replacing NSF 24-579, NSF 24-580, and NSF 24-582. It is designed for deep technology development across many sectors rather than a narrow challenge category. The official page says the document was posted May 22, 2026 and is the current version.

A simple way to compare it: many grant programs are “topic-specific,” while 26-510 is infrastructure and commercialization oriented. The program language emphasizes that NSF funds technical R&D, not commercial procurement. That distinction matters in review: teams should position themselves as building and de-risking technology, not as vendors responding to a pre-defined government buy.

Another key design element is pathway variety. It combines:

• Phase I: high-risk discovery and feasibility
• Phase II: scale and commercialization readiness
• Fast-Track: connected Phase I and Phase II timeline with one submission route
• Supplemental and Strategic Breakthrough follow-on possibilities for select companies

If your team needs one entry path and one deadline, this is not that call. If your team can plan around recurring cycles, route logic, and staged risk reduction, this is a better match.

Why this is relevant for 2026–2027

From the posted solicitation and summary language, this opportunity is framed around several priorities tied directly to U.S. competitiveness and security. It is tied to NSF’s mission language of economic growth and workforce building, and the solicitation explicitly states NSF is relaunching the SBIR/STTR model under this path.

For teams building deep-tech products where prototyping, testing, and commercialization are expensive and multi-stage, this alignment can be important:

1. NSF’s baseline is not “fund everything.” It supports companies and technical projects that show rigor and market value.
2. The opportunity includes route progression. You can start at Phase I, then move to Phase II, and consider deeper follow-on funding only if technical and market signals warrant it.
3. The invitation and progression rules may reduce random waste but increase admin discipline. Teams that do not manage the pipeline early are penalized in process compliance.

The current schedule has four listed deadlines: July 27, 2026, November 4, 2026, March 4, 2027, and July 7, 2027. July 27, 2026 has passed; November 4, 2026 is the next listed full-proposal deadline. NSF then describes recurring first-Wednesday-in-November, first-Thursday-in-March, and first-Wednesday-in-July deadlines. This is a structured recurring window, not a continuously open application.

Eligibility and structural requirements you should confirm first

The first step in a serious application is not proposal drafting; it is eligibility validation. NSF explicitly places several controls in the solicitation that affect whether your team is accepted into the route at all.

1. Applicant must be a qualifying small business concern

NSF states proposals can only be submitted by firms that qualify as a small business concern under SBIR/STTR rules. This includes the employee limit (500 employees, including affiliates). If that is exceeded, you may not be eligible, regardless of technical quality.

2. Phase I and Fast-Track invitation requirements

For this solicitation, both Phase I and Fast-Track proposals require a formal invitation process through a Project Pitch and acceptance by program staff. Teams must submit and receive this invite before submitting full proposals. Invitations are tied to deadlines; they are not “general application windows.”

3. STTR partner institution condition

If you are applying in STTR format, the small business must partner with a research institution and issue a subaward. SBIR does not require that same institutional subaward structure.

4. PI qualification and effort

The PI must have a legal right to work for the proposing company in the United States and be primarily employed by it, which NSF defines as at least 51% employment. NSF normally considers a full-time work week to be 40 hours and considers employment elsewhere greater than 19.6 hours per week to conflict with this requirement, absent an approved deviation.

5. PI degree requirements

The solicitation explicitly says no PI degree requirement is specified in this section, so this is not typically a filter. The heavier filter is legal eligibility and operational commitment.

6. Proposal process and cost-share

Submissions must follow Research.gov and PAPPG guidance, and voluntary committed cost sharing is prohibited. This is a notable practical point: if your budget assumes guaranteed matching funds as required contributions, that assumption can weaken your submission.

Funding mechanics: what each route actually supports

The solicitation makes clear that this is not a single “ticket-size” grant. There are several mechanisms, and route choice should match project maturity.

Phase I

Phase I is the proof-of-concept stage and may be submitted up to $305,000 for about 6–18 months. It includes all direct costs, indirect costs, small business fee, optional TABA, and I-Corps support references.

What Phase I should deliver:

• Demonstrate technical feasibility and reduce core development risk.
• Show that the project can progress to a stronger commercialization pathway.
• Establish the first credible set of evidence for further funding.

Phase II

Phase II is for NSF SBIR/STTR Phase I awardees, at up to $1,250,000 and typically around 24 months. NSF requires the Phase II proposal to be submitted between 6 and 24 months after the start date of the relevant Phase I award. This is a standard maturation route: team formation, commercialization planning, prototyping depth, and market validation increase in expected rigor.

Key practical note: Phase II is not for first-time SBIR/STTR entrants. NSF explicitly limits this path to recent NSF SBIR/STTR Phase I awardees.

Fast-Track

Fast-Track allows combined Phase I/Phase II development in a single progression route, with a top-end of $1,555,000. NSF describes a Phase I component of $400,000 over 6 to 12 months and a Phase II component of up to $1,155,000 over an additional 18 to 24 months.

This can be useful if you already have strong evidence and need fewer sequencing delays, but it still requires the invitation mechanism and strong internal readiness because the timeline is tighter.

Supplements and Strategic Breakthrough

There are additional mechanisms available to Phase II awardees:

• Phase IIB supplement: $50,000 to $500,000
• TECP supplement: up to 20% of the Phase II award
• Strategic Breakthrough award: possible up to $30,000,000 for selected high-impact pathways after invitation by the cognizant Program Officer

These pathways are designed for ventures that prove enough technical progress and then need targeted extra capital to de-risk commercialization. They are not default options; they are strategic tools for teams that can justify a pivot from lab progress to market execution.

Proposal preparation and submission workflow

This route is technical and procedural. The common failure pattern is treating it as a normal federal proposal form without route-specific constraints.

The required submission system

NSF states clearly that full proposals must be submitted through Research.gov. This is the core operational detail to respect. Proposal systems and templates are not interchangeable across NSF opportunities.

For the next listed window, plan for the November 4, 2026 deadline at 5 p.m. in the submitting organization’s local time. NSF says letters of intent and preliminary proposals are not required for this solicitation. A Phase I or Fast-Track applicant must still complete the Project Pitch and obtain the required official invitation before submitting the full proposal. Use the PAPPG version in effect on the due date, not an older saved template.

Preparation order you should follow

1. Verify small-business and PI eligibility against SBIR/STTR criteria.
2. Confirm whether your route is Phase I, Fast-Track, or Phase II.
3. If your route is Phase I or Fast-Track, submit a Project Pitch and secure invitation first.
4. Build a route-aligned budget aligned with NSF’s no-voluntary-cost-share rule.
5. Draft technical narrative and commercialization plan tied to NSF merit expectations.
6. Run an internal compliance pass specifically for PI employment, effort %, and STTR partner requirements.
7. Submit through Research.gov in the correct solicitation window.

What to include in the proposal body

• Problem statement connected to your commercial target market.
• Technical milestones with realistic timeframes (phase-appropriate).
• Risk management plan showing technical and commercial assumptions.
• Commercialization and customer pathway, not just technical elegance.
• Clear team structure with PI and partner-organization roles (especially for STTR).
• Budget consistency and justification tied to phase scope.

Review criteria and what evaluators are likely testing

NSF SBIR/STTR routes generally use merit review criteria plus commercial dimensions. The solicitation reiterates three merit lenses:

• Intellectual Merit
• Broader Impacts
• Commercial Potential

A winning file for this solicitation usually has a coherent narrative across all three, not excellence in only one.

For applicants, this means:

• Technical sections must be specific and evidence-based.
• Broader impact should be operational and measurable, not just visionary.
• Commercial potential needs explicit pathways with customer or deployment assumptions.

Because the solicitation is broad in topical scope, proposals are not judged by a narrow thematic requirement. Instead, they are judged on whether they demonstrate strong R&D execution, risk control, and transition readiness.

Common mistakes that derail applications

1) Treating Phase I/Fast-Track as open and immediate

Both routes have invitation gates through the Project Pitch process. Missing this at the front is a terminal delay.

2) Ignoring the 500-employee and affiliate cap

Small-business status is a hard constraint. This is not a generic “should be small” statement.

3) PI effort and legal work-right issues

PI ineligibility or split commitments that conflict with NSF expectations can become serious review blockers.

4) Confusing route-level limits

Phase II is not open to all entrants. It is tied to prior NSF SBIR/STTR Phase I status. Teams that apply outside the sequence get rejected before technical review benefits.

5) Budget assumptions with voluntary cost sharing

The solicitation explicitly prohibits voluntary committed cost sharing. Keep funding ask clean and compliance-safe.

6) Underestimating proposal limits and expiry mechanics

Project Pitch has per-company and per-project submission restrictions. These are not optional process notes; they affect strategic timing and resubmission planning.

Frequently asked practical questions

Is this opportunity open right now?

The solicitation page identifies it as an active funding opportunity with posted deadlines in 2026 and 2027, including a recurring cadence. That means it is not a closed legacy-only listing, but it is also not a standing acceptance list. Each deadline window has operational gating.

Are grants awarded in all technical areas?

NSF describes SBIR/STTR 26-510 as broadly open across nearly all technology areas, rather than a narrow problem-specific challenge. The competitive bar is still route and commercialization readiness.

Do you need to include a matching fund requirement?

Voluntary committed cost sharing is explicitly prohibited. You should not treat external matching as a required component.

Can non-U.S. companies apply?

The solicitation is written around U.S. small-business concern participation and U.S.-based PI legal work authorization expectations. International teams should evaluate structure carefully before applying.

Is there an official direct submission link?

The official opportunity page is the anchor and full submissions are via Research.gov.

Application strategy for teams preparing for the 2026/2027 windows

If you are targeting NSF 26-510, the most reliable strategy is route discipline.

1. Decide route:

   • If you are at early feasibility and can meet invitation requirements, use Phase I.
   • If you already have stronger data, a clean commercialization hypothesis, and need a connected path to scale, consider Fast-Track.
   • If you already hold a qualifying NSF Phase I award, focus on Phase II and supplemental planning.

2. Build an evidence-first package:

   • Technical feasibility evidence.
   • Team capability and retention plan.
   • Customer conversation, sales hypothesis, and pilot strategy.
   • Compliance checklist for PI effort, STTR role, and budget structure.

3. Use pre-deadline milestones:

   • Project Pitch and invitation verification.
   • Draft + internal legal/compliance review.
   • Budget freeze and final science/commercial narrative alignment.

4. Do not overfit to trend language:

   • NSF reads for execution, not hype. Keep claims precise and supportable.

Documents and official pages to read next

Use these pages directly from NSF and NSF-linked official portals:

• Official solicitation and requirements: https://www.nsf.gov/funding/opportunities/small-business-innovation-research-small-business-technology/nsf26-510/solicitation
• NSF SBIR/STTR policy and eligibility context: https://www.sbir.gov/ and linked policy references in the solicitation
• Proposal system (Research.gov): https://www.research.gov/
• NSF policy and award guidance: https://www.nsf.gov/bfa/dias/policy/

Final practical conclusion

NSF 26-510 is best for teams that can move through staged federal commercialization funding with operational discipline. It is not the easiest path because invitation and route conditions are strict, but those same constraints can help serious teams stay focused.

If you are considering this now in 2026 or 2027, the highest-probability preparation path is: confirm eligibility first, secure pitch status where required, build a phase-matched technical-commercial plan, and submit through the right channel. The solicitation is broad by topic and difficult by process. A compliant and coherent package is the difference between passing NSF’s technical review sequence and being filtered out before science is even scored.