Nonprofit · EIN 52-1231783
INTERNATIONAL UNION OF GEOLOGICAL SCIENCES
Tax-exempt · RESTON, VA 20192
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $630,031 | $725,548 | -$95,517 | $1,274,025 | $0 | $1,274,025 |
| December 31, 2024 | 990 | $540,595 | $792,084 | -$251,489 | $1,369,542 | $0 | $1,369,542 |
| December 31, 2023 | 990 | $710,193 | $745,070 | -$34,877 | $1,621,012 | $0 | $1,621,012 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $626,786
- Membership dues
- $449,020
- Program service revenue
- $0
- Investment income
- $119
- Other revenue
- $3,126
Expenses
- Grants and similar amounts paid
- $491,168
- Compensation of officers, directors and key employees
- $0
- Salaries, compensation and benefits (total)
- $0
- Professional fundraising fees
- $0
- Accounting fees
- $16,200
- Travel
- $118,972
- Program services (functional)
- $725,548
Balance sheet and other
- Total assets, start of year
- $1,369,542
- Total assets, end of year
- $1,274,025
- Total liabilities, end of year
- $0
- Net assets, end of year
- $1,274,025
- Gross receipts
- $630,031
- Employees
- 0
- Volunteers
- 200
- Year formed
- 1961
- State of legal domicile
- VA
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 |
|---|---|---|---|
| Professor Hassina Mouri | President Officer | 20 | $0 |
| Professor David Cohen | Treasurer Officer | 15 | $0 |
| Dr Ludwig Stroink | Secretary-General Officer | 20 | $0 |
990 for the year ended December 31, 2024: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Professor Hassina Mouri | President Officer | 20 | $0 |
| Professor David Cohen | Treasurer Officer | 12 | $0 |
| Professor Ludwig Stroink | Secretary-General Key employee | 15 | $0 |
990 for the year ended December 31, 2023: 3 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Prof John LUDDEN CBE | President Officer | 20 | $0 |
| Prof Stanley C FINNEY | Secretary General Officer | 20 | $0 |
| Prof Hiroshi KITAZATO | Treasurer Officer | 20 | $0 |
Address and contacts
- Address (IRS master file)
- NATIONAL CENTRE 917-12201, RESTON, VA 20192-0001
- Principal officer (990 for 2025)
- Hassina Mouri, University of Johannesburg, University Road, Auckland Park, Gauteng 2006, SF
- Signed the 990
- David Cohen, Treasurer
- Phone
- (310) 710-0701
- Website
- https://www.iugs.org/
Mission
IUGS promotes development of the geosciences through the support of broad-based scientific studies, technical comissinos and scientific conferences, to apply the results of these and other studies to preserve the natural environment, to strengthen public awareness of geology and advance geological education in the widest sense.
Program accomplishments
- Co-financing of the "International Geoscience Programme (IGCP)" in cooperation with UNESCO: a broad international cooperation program in the earth sciences and memberships and contribution to the activities of the International Science Council.Expenses $250,240
- Financing of activities of international commissions, task groups and initiatives tackling issues of global significance in the geosciences. Hosting of IUGS-sponsored scientific events and operations of secretariat/account support/executive committeeExpenses $270,907
- Publication and dissemination of the IUGS journal "EPISODES", a high-impact publication at the service of the global geoscience community, contributions to the One Geology mapping program and presentation of IUGS awardsExpenses $30,000 · grants $30,000
- Operational costs of the IUGSExpenses $174,401
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
- 52-1231783
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (509(a)(2))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1982
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Science and technology (U36C)
- Assets (IRS master file)
- $1,274,025
- Income (IRS master file)
- $630,031
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $630,031 | $725,548 | $1,274,025 | XML |
| 990 | December 2024 | $540,595 | $792,084 | $1,369,542 | XML |
| 990 | December 2023 | $710,193 | $745,070 | $1,621,012 | XML |
| 990 | December 2022 | $533,616 | $643,013 | $1,655,889 | 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 52-1231783).
Questions about INTERNATIONAL UNION OF GEOLOGICAL SCIENCES
- What is the EIN of INTERNATIONAL UNION OF GEOLOGICAL SCIENCES?
- The employer identification number (EIN) of INTERNATIONAL UNION OF GEOLOGICAL SCIENCES is 52-1231783.
- Is INTERNATIONAL UNION OF GEOLOGICAL SCIENCES tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1982.
- Are donations to INTERNATIONAL UNION OF GEOLOGICAL SCIENCES tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does INTERNATIONAL UNION OF GEOLOGICAL SCIENCES 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 INTERNATIONAL UNION OF GEOLOGICAL SCIENCES 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 INTERNATIONAL UNION OF GEOLOGICAL SCIENCES last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of INTERNATIONAL UNION OF GEOLOGICAL SCIENCES?
- The 990 for the year ended December 31, 2025 names Hassina Mouri.
- Who are the officers and directors of INTERNATIONAL UNION OF GEOLOGICAL SCIENCES?
- The 990 for the year ended December 31, 2025 lists 3 people; 0 received compensation from the organization.
- How much revenue does INTERNATIONAL UNION OF GEOLOGICAL SCIENCES have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $630,031, expenses of $725,548 and total assets of $1,274,025 at year end.
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