America's Seed Fund (SBIR/STTR) vs Seed Enterprise Investment Scheme (SEIS) (2026): Which Is Better for Startups?
Both are startup grants. Here is how America's Seed Fund (SBIR/STTR) and Seed Enterprise Investment Scheme (SEIS) compare on what a startup gets, who qualifies and how to apply, and which one we would pick.
America's Seed Fund (SBIR/STTR)
Equity-free US federal R&D awards from 11 agencies, from proof of concept (Phase I) to prototype (Phase II).
8.5 /10
Pricing: Up to $2.2M in credits & perks
Pros
- Equity-free, large awards up to about $2.15 million in Phase II
- Eleven agencies and many topics to choose from
- Reauthorised through September 2031
Cons
- Long, formal proposals with low success rates
- Agencies are still restarting solicitations after the 2025-26 lapse
Seed Enterprise Investment Scheme (SEIS)
UK tax relief for your investors on up to GBP 250,000 of seed shares, which makes early rounds much easier to raise.
8.0 /10
Pricing: Free to join
Pros
- Makes UK angel rounds much easier to close
- Advance assurance gives investors confidence
- Open all year
Cons
- Not a grant: the benefit goes to investors
- Strict rules for three years after the investment
America's Seed Fund (SBIR/STTR) vs Seed Enterprise Investment Scheme (SEIS) at a glance
| America's Seed Fund (SBIR/STTR) | Seed Enterprise Investment Scheme (SEIS) | |
|---|---|---|
| Editor score | 8.5 / 10 | 8.0 / 10 |
| Pricing model | Free | Free |
| What you get | Up to $2.2M in credits & perks | Free to join |
| Who qualifies | US for-profit small business, under 500 employees, majority owned and controlled by US citizens or permanent residents; R&D done in the US; STTR needs a research-institution partner. | UK-established company with gross assets up to GBP 350,000, under 25 FTE employees, qualifying trade under 3 years old; max GBP 250,000 raised under SEIS. |
| Partner code needed | No | No |
| Steps it helps with | raise funding, claim startup credits | raise funding, claim startup credits |
| Who it is for | Pre-seed, Seed stage, Bootstrapped, AI startups, Climate & energy, Health & bio | Pre-seed, Seed stage, Solo founders, Any stage |
| Reader upvotes | 0 | 0 |
| Best for | sbir, sttr, non-dilutive | seis, tax relief, angel investment |
Our pick
America's Seed Fund (SBIR/STTR) edges it with a score of 8.5 versus 8.0. America's Seed Fund (SBIR/STTR) is the better fit if you value: equity-free, large awards up to about $2.15 million in phase ii, eleven agencies and many topics to choose from. Choose Seed Enterprise Investment Scheme (SEIS) instead if you need: makes uk angel rounds much easier to close, advance assurance gives investors confidence. Many startups can claim both: see credits by value.
Other startup grants to consider
Full ranking →NSF SBIR/STTR (America's Seed Fund powered by NSF) 🎁 ProgramFree
Up to $2 million of zero-equity seed funding from NSF for deep-tech startups, starting with a short Project Pitch.
EIC Accelerator 🎁 ProgramFree
Grant of up to EUR 2.5 million (about $2.9 million) for deep-tech startups and SMEs, with optional EIC equity.
SR&ED Tax Incentive (Canada) 🎁 ProgramFree
Refundable 35% R&D tax credit for Canadian-controlled private corporations on up to C$6 million of R&D a year.
R&D Tax Incentive (Australia) 🎁 ProgramFree
Refundable R&D tax offset of your company tax rate plus 18.5% for Australian companies with turnover under A$20 million.