Is it real?
Yes. Never revoked by the IRS. Latest filing on record: FY2025. IRS ruling in Sep 2013.
IRS Pub. 78 · IRS Auto-Revocation List · IRS Business Master File
Where the money goes
100 cents of each dollar spent went to programs.
Form 990 Part IX, line 25. Every line is in By the numbers.
Something off? Claim to add context
Who runs it and what they're paid
4 people listed on the 990.
Questions the 990 asks
The form asks each of these directly. These are the filed answers.
- Family or business ties among officersPt VI · Ln 2No
- Top official's pay set by an independent reviewPt VI · Ln 15aNo
Programs and updates
Teaches collaborative design to create an abundant economy and end housing scarcity.
Questions for Open Source Ecology
Your first name shows with your question. Open Source Ecology answers here, for everyone.
First Program Service Accomplishment
Education and Builder Training This year Open Source Ecology expanded its apprenticeship and builder training efforts through development of the Builder Crash Course and Future Builders Academy programs.
Form 990 Part III, line 4, FY2025. The organization’s own words, as filed with the IRS. Find it at the IRS (EIN 45-4997514) · Dispute this lineSecond Program Service Accomplishment
Open Source Housing Development OSE continued development and demonstration of open-source housing systems through construction, deployment, and market validation of Seed Eco-Home models. During the year, OSE completed construction of its first market-ready production build, the Seed Eco-Home 4, which was placed on the market and entered…
Form 990 Part III, line 4, FY2025. The organization’s own words, as filed with the IRS. Find it at the IRS (EIN 45-4997514) · Dispute this lineThird Program Service Accomplishment
Open Collaborative Design and Documentation Systems In response to rapidly advancing artificial intelligence capabilities and the increasing feasibility of collaborative design automation, OSE initiated development of open collaborative design and documentation systems intended to make technical knowledge for housing, fabrication, and…
Form 990 Part III, line 4, FY2025. The organization’s own words, as filed with the IRS. Find it at the IRS (EIN 45-4997514) · Dispute this lineFunders
Who pays for it.
From grant filings on record. Receipts are incomplete: individual donors are never listed.
Grants
By the numbers
The FY2025 990, line by line.
Download 990
| Line | Start FY25 | End FY25 |
|---|---|---|
| Cash and savingsLn 1–2 | $310K | $508K |
| Total assetsLn 16 | $310K | $508K |
| LiabilitiesLn 26 | $0 | $0 |
| Net assetsLn 32 | $310K | $508K |
| Line | Total | Programs | Management | Fundraising |
|---|---|---|---|---|
| Other fees for servicesLn 11g | $492K | $492K | $0 | $0 |
| Total functional expensesLn 25 | $492K | $492K | $0 | $0 |
Filing history
| Year | Money in | Money out | In minus out | Net assets | Download |
|---|---|---|---|---|---|
| FY2025 Latest ViewingFiled with the IRS May 15, 2026 | $690K | $492K | $198K | $508K | 990 PDF |
| FY2024Filed with the IRS May 13, 2025 | $259K | $196K | $63K | $310K | 990 PDF |
| FY2023Filed with the IRS May 12, 2024 | $258K | $203K | $56K | $247K | 990 PDF |
| FY2022Filed with the IRS May 14, 2023 | $198K | $154K | $44K | $191K | 990 PDF |
| FY2021Filed with the IRS May 15, 2022 | $173K | $242K | −$69K | $147K | 990 PDF |
| FY2020Filed with the IRS Jun 16, 2021 | $79K | $76K | $4K | $16K | 990 PDF |
Schedules filed Part IV
See the full FY2025 990
Part I · Summary $689,928 revenue, 12 lines filed
Part VI · Governance 5 of 5 board members independent, 2 to look at
Part VIII · Statement of revenue $689,928 across 10 lines filed
Part IX · Statement of functional expenses $491,858 across 1 line filed
Part X · Balance sheet $507,723 assets, 15 lines filed
Part XI · Reconciliation of net assets $507,723 net assets at year end
Form 990 e-file (XML) FY2025 from the IRS · Classification, formation year and address from the IRS Business Master File
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