Nonprofit · EIN 26-2386590
SEASTEADING INSTITUTE
Tax-exempt · OAKLAND, CA 94607
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $1,257,075 | $307,459 | $949,616 | $1,988,637 | $8,680 | $1,979,957 |
| December 31, 2024 | 990 | $512,352 | $366,398 | $145,954 | $635,037 | $6,258 | $628,779 |
| December 31, 2023 | 990 | $337,348 | $519,781 | -$182,433 | $488,414 | $5,589 | $482,825 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $553,875
- Program service revenue
- $0
- Investment income
- $703,200
- Net gain from sales of assets
- $703,130
- Other revenue
- $0
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $122,849
- Other salaries and wages
- $73,700
- Salaries, compensation and benefits (total)
- $222,411
- Professional fundraising fees
- $0
- Accounting fees
- $2,740
- Occupancy
- $4,692
- Travel
- $277
- Depreciation
- $196
- Program services (functional)
- $253,666
- Management and general (functional)
- $38,728
- Fundraising (functional)
- $15,065
Balance sheet and other
- Total assets, start of year
- $635,037
- Total assets, end of year
- $1,988,637
- Total liabilities, end of year
- $8,680
- Net assets, end of year
- $1,979,957
- Land, buildings and equipment
- $671
- Net assets without donor restrictions
- $1,979,957
- Gross receipts
- $1,350,190
- Employees
- 2
- Volunteers
- 25
- Year formed
- 2008
- State of legal domicile
- CA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| Joe Quirk | President Trustee or director, Officer | 43 | $97,161 | $25,688 |
| Michael Strong | Board Member Trustee or director | 1 | $0 | $0 |
| OShane Balloun | Secretary Trustee or director, Officer | 1 | $0 | $0 |
| James Von Ehr | Board Member Trustee or director | 1 | $0 | $0 |
| Katie Chowne | Treasurer Officer | 1 | $0 | $0 |
990 for the year ended December 31, 2024: 5 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| Joe Quirk | President Trustee or director, Officer | 43 | $87,740 | $20,746 |
| Michael Strong | Board Member Trustee or director | 1 | $0 | $0 |
| OShane Balloun | Secretary Trustee or director, Officer | 1 | $0 | $0 |
| James Von Ehr | Board Member Trustee or director | 1 | $0 | $0 |
| Katie Chowne | Treasurer Officer | 1 | $0 | $0 |
990 for the year ended December 31, 2023: 5 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Joe Quirk | President Trustee or director, Officer | 43 | $87,740 |
| Michael Strong | Board Member Trustee or director | 1 | $0 |
| OShane Balloun | Secretary Trustee or director, Officer | 1 | $0 |
| James Von Ehr | Board Member Trustee or director | 1 | $0 |
| Katie Chowne | Treasurer Officer | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 919 CENTER ST, OAKLAND, CA 94607-1917
- In care of
- % JOE QUIRK
- Signed the 990
- Joe Quirk, President
- Phone
- (866) 743-6660
- Website
- www.seasteading.org
- Return prepared by
- TAMMY M KETTLER
California records
California keeps its own records of charities and corporations. Search them by EIN 26-2386590 or by the name SEASTEADING INSTITUTE.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
Mission
Works to enable floating societies which will allow the next generation of pioneers to test new ideas for government
Program accomplishments
- In 2025, The Seasteading Institute worked to promote floating city projects by continuing research into flagging and classification for active projects and educating our online and conference audiences about the progress of our partners who are designing and building structures for life on the ocean.Expenses $253,666
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 26-2386590
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 2009
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Social science (V05)
- Assets (IRS master file)
- $1,988,637
- Income (IRS master file)
- $1,350,190
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $1,257,075 | $307,459 | $1,988,637 | XML |
| 990 | December 2024 | $512,352 | $366,398 | $635,037 | XML |
| 990 | December 2023 | $337,348 | $519,781 | $488,414 | XML |
| 990 | December 2022 | $666,268 | $470,492 | $721,499 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990-EZ | December 2019 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 26-2386590).
Questions about SEASTEADING INSTITUTE
- What is the EIN of SEASTEADING INSTITUTE?
- The employer identification number (EIN) of SEASTEADING INSTITUTE is 26-2386590.
- Is SEASTEADING INSTITUTE tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2009.
- Are donations to SEASTEADING INSTITUTE tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does SEASTEADING INSTITUTE file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of SEASTEADING INSTITUTE due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did SEASTEADING INSTITUTE last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who are the officers and directors of SEASTEADING INSTITUTE?
- The 990 for the year ended December 31, 2025 lists 5 people; 1 received compensation from the organization, the highest $97,161 (Joe Quirk, President).
- How much revenue does SEASTEADING INSTITUTE have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $1,257,075, expenses of $307,459 and total assets of $1,988,637 at year end.
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