SBIR and STTR, "America's Seed Fund," provide billions in non-dilutive R&D funding to small businesses. How the programs work, award sizes, success rates, and how to apply.

If your small business is developing something genuinely new, and the science isn’t fully settled yet, there’s a federal program that will fund the risky R&D without taking a cent of equity. It’s called SBIR/STTR, better known as “America’s Seed Fund,” and it has moved tens of billions of dollars to small companies since 1982.

This guide explains what SBIR and STTR are, how much you can get, what your odds look like, and the single biggest myth that trips people up.

TL;DR: Quick Answers

What is SBIR/STTR? Two federal programs, the Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) programs, that fund R&D at small businesses. Together they’re branded “America’s Seed Fund.”
How much can you get? Per SBA / SBIR.gov, as of April 2026, Phase I awards go up to $323,090 and Phase II up to $2,153,927 without special SBA approval.
What are the success rates? They vary by agency; NSF has the highest at roughly 20% (SBA/SBIR.gov). Federal small-business grant approval generally runs about 10–20%.
Is it a loan or equity? Neither. SBIR/STTR awards are non-dilutive grants and contracts, no repayment, no equity taken.

What Are SBIR and STTR?

SBIR and STTR are coordinated by the U.S. Small Business Administration (SBA) but funded and run by individual federal agencies. Per SBA / SBIR.gov, the SBIR program dates to 1982, and today 11 federal agencies participate, awarding a set percentage of their extramural R&D budgets to small businesses. Because the funding is a grant or contract rather than an investment, it is non-dilutive: you keep your equity and your intellectual property.

The money is not spread evenly across agencies. Per SBA/SBIR.gov, the Department of Defense (DOD) and the Department of Health and Human Services (HHS, largely through the NIH) together account for more than 75% of all SBIR/STTR funding. If your technology touches defense or health, that’s where most of the dollars live, though NSF, DOE, NASA, USDA, and others run substantial programs too.

The core idea is simple: the federal government wants small businesses to commercialize high-risk, high-reward research that the private market alone won’t fund early enough. In exchange for that early money, the government gets innovation, jobs, and technology it can use.

How Much SBIR/STTR Funding Is Available

The cumulative scale is striking. According to SBA / SBIR.gov, the programs made 178,731 awards totaling $54.6 billion through FY2019, a track record few funding programs of any kind can match.

The annual flow is substantial too. In 2021, the programs made roughly 7,000 awards to more than 4,000 recipients (SBA/SBIR.gov), and the SBA has estimated the programs support on the order of 65,578 jobs a year. For a program aimed squarely at small businesses, that is a meaningful footprint, and it’s part of why SBIR/STTR is often described as one of the most successful public R&D-commercialization efforts anywhere.

For how these figures sit inside the wider funding landscape, see our 2026 grant statistics roundup.

Award Sizes: Phase I and Phase II

SBIR/STTR funding is structured in phases, and the dollar figures are set by the SBA and updated periodically. Per SBA / SBIR.gov, as of April 2026:

Phase I (feasibility / proof of concept): awards up to $323,090 without special SBA approval. Phase I is short, typically 6–12 months, and exists to establish technical merit and feasibility.
Phase II (R&D / prototype development): awards up to $2,153,927 without special SBA approval. Phase II builds on successful Phase I results and usually runs about two years.
Phase III (commercialization): not funded with SBIR/STTR dollars directly. This is where the company pursues the market, often with non-SBIR follow-on funding or contracts.

Agencies can, with SBA approval, exceed those Phase I and Phase II ceilings for specific topics, so always check the current solicitation for the program you’re targeting. The takeaway: a company that wins both phases can bring in well over $2 million in non-dilutive R&D funding across a single project line.

Success Rates

Odds vary a lot by agency, phase, and year. Per SBA / SBIR.gov, NSF has the highest SBIR success rate of the 11 participating agencies, around 20%. Other agencies run lower, and success rates fluctuate with each solicitation’s budget and volume of applicants.

More broadly, federal small-business grant approval tends to fall in the 10–20% range, so SBIR/STTR is competitive but far from a lottery, especially for applicants who frame their proposal correctly. That framing matters enormously: agencies like NSF fund research that reduces technical risk, not product development, a distinction we cover in depth in NSF SBIR/STTR: research vs. development. For how these odds compare with other grant programs, see our grant success rate statistics.

Program Status and Reauthorization

SBIR/STTR operates under a congressional authorization that has to be renewed periodically, which in past years created uncertainty about the programs’ continuity. That uncertainty is resolved for now: Congress reauthorized SBIR/STTR in April 2026, extending the programs through September 30, 2031 (SBA / SBIR.gov). For applicants, that means a stable multi-year runway to plan Phase I and Phase II applications without worrying that the program will lapse mid-cycle.

SBIR vs. STTR

The two programs are close cousins with one key difference:

SBIR funds R&D led by the small business itself. Partnering with a research institution is allowed but not required, and the small business must perform the majority of the work.
STTR requires the small business to formally partner with a nonprofit research institution (typically a university or federal lab). The work is split between the two, with the small business and the research partner each performing a minimum share.

If your innovation depends heavily on academic research or a specific lab’s expertise, STTR is designed for that collaboration. If your team can carry the R&D in-house, SBIR is usually the simpler path. Award sizes, phases, and the non-dilutive nature are the same across both.

A Myth Worth Clearing Up

Here’s the misconception that sends countless founders down the wrong road: the SBA does not give grants to start or expand a business. Per SBA / SBIR.gov, the SBA’s own guidance is explicit that it does not offer general business grants for launching or growing a company. The agency’s core products are loans and loan guarantees, plus counseling and contracting support, see our SBA grants guide for the full picture.

SBIR and STTR are the closest thing to “SBA grants” that exist, but even these are not general business money. They are agency-specific R&D awards for advancing a defined technical innovation, coordinated by the SBA but funded and awarded by DOD, HHS/NIH, NSF, and the other participating agencies. You can’t use them to hire a sales team, buy inventory, or cover payroll for an existing product. If your project is genuine research and development on something new, SBIR/STTR may be an excellent fit. If you’re looking for capital to run or grow a business, you’re looking at loans, investors, or private grants instead.

How Grantboost Helps

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SBIR & STTR Grants: The Complete Guide to America's Seed Fund