Nonprofit · EIN 91-1973431
INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES
Tax-exempt · ASHLAND, KY 41101
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990-EZ | $57,621 | $46,553 | $11,068 | $76,785 | $0 | $76,785 |
| December 31, 2024 | 990-EZ | $41,545 | $36,551 | $4,994 | $65,717 | $0 | $65,717 |
| December 31, 2023 | 990-EZ | $96,004 | $100,992 | -$4,988 | $60,723 | $0 | $60,723 |
Financial details: 990-EZ for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $1,500
- Membership dues
- $11,921
- Program service revenue
- $44,200
- Investment income
- $0
- Other revenue
- $0
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $0
- Salaries, compensation and benefits (total)
- $0
- Other expenses
- $46,553
- Program services (functional)
- $46,553
Balance sheet and other
- Total assets, start of year
- $65,717
- Total assets, end of year
- $76,785
- Total liabilities, end of year
- $0
- Net assets, end of year
- $76,785
- Cash, savings and investments
- $76,785
- Gross receipts
- $57,621
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-EZ for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Jennifer Makar | VP Administration | 10 | $0 |
| Peter Erdi | Secretary and VP Protocol | 2 | $0 |
| Gary Smith | Past President | 2 | $0 |
| Jennifer Wilby | VP Research and Publications | 3 | $0 |
| Gary Metcalf | Treasurer | 1 | $0 |
| William Smith | VP Systems Practice | 1 | $0 |
| Yiannis Laouris | President | 2 | $0 |
| Clifford Whitcomb | VP Education | 1 | $0 |
| Patrick Hoverstadt | President Elect | 2 | $0 |
990-EZ for the year ended December 31, 2024: 10 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Jennifer Makar | VP Administration | 5 | $0 |
| Rene Oosthuizen | Secretary and VP Protocol | 1 | $0 |
| Michele Friend | Past President | 3 | $0 |
| Jennifer Wilby | VP Research and Publications | 3 | $0 |
| Gary Metcalf | Treasurer | 1 | $0 |
| William Smith | VP Systems Practice | 1 | $0 |
| Gary Smith | President | 5 | $0 |
| Haider Al Shareefy | VP Membership | 2 | $0 |
| Yiannis Laouris | President Elect | 2 | $0 |
| Clifford Whitcomb | VP Education | 2 | $0 |
990-EZ for the year ended December 31, 2023: 11 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| Jennifer Makar | VP Administration | 10 | $0 |
| Rene Oosthuizen | Secretary and VP Protocol | 2 | $0 |
| Roelien Goede | Past President | 10 | $0 |
| David Ing | Board of Trustees Representative | 2 | $0 |
| Jennifer Wilby | VP Research and Publications | 6 | $0 |
| Gary Metcalf | VP Funds | 2 | $0 |
| William Smith | VP Systems Practice | 2 | $0 |
| Gary Smith | President Elect | 5 | $0 |
| Daniel Friedman | VP Education | 2 | $0 |
| Haider Al Shareefy | VP Membership | 2 | $0 |
| Michele Friend | President | 10 | $0 |
Address and contacts
- Address (IRS master file)
- 1408 1/2 CENTRAL AVENUE, ASHLAND, KY 41101-0000
- In care of
- % JENNIFER WILBY
- Signed the 990-EZ
- Jennifer Makar, VP Administration
- Phone
- (408) 221-6521
- Website
- www.isss.org
Mission
Educational: the ISSS provides membership benefits in the form of systems education publications and annual meetings for its membership and other interested researchers. We host educational learning sessions online throughout the year so researchers can meet and share their work to further the field of systems science. Our aim is to research the field of systems science and provide educational opportunities to share the findings.
Program accomplishments
- This year the ISSS worked to serve the membership and the systems community at large by holding an in person annual meeting attended by over 90 people in person and 90 people online. ISSS has also continued to increased its options for members to collaborate and participate online by using meeting platforms and opportunities. This year the ISSS provided an opportunity for members to contribute to the theme of advancing together across the systems science field. ISSS currently has an overall membership of 130 people. Due to the success of our online presence, it was decided to continue to include online program options to increase accessibility for members and the organization. The ISSS also published an extensive conference proceedings that capture the research and collaborations of the year. The organization also created a number of recorded videos of many of the presentations, sessions and conversations that took place over the year and attended by members and non members from around the world.Expenses $46,553
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-EZ on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990-EZ on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990-EZ on file |
IRS record
- EIN
- 91-1973431
- 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
- 1999
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Social science (V32)
- Assets (IRS master file)
- $76,785
- Income (IRS master file)
- $57,621
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-EZ | December 2025 | $57,621 | $46,553 | $76,785 | XML |
| 990-EZ | December 2024 | $41,545 | $36,551 | $65,717 | XML |
| 990-EZ | December 2023 | $96,004 | $100,992 | $60,723 | XML |
| 990-EZ | December 2022 | – | – | – | IRS |
| 990-EZ | December 2021 | – | – | – | IRS |
| 990-EZ | December 2020 | – | – | – | IRS |
| 990-EZ | 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 91-1973431).
Questions about INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES
- What is the EIN of INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES?
- The employer identification number (EIN) of INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES is 91-1973431.
- Is INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1999.
- Are donations to INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does INTERNATIONAL SOCIETY OF SYSTEMS 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 SOCIETY OF SYSTEMS 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 SOCIETY OF SYSTEMS SCIENCES last file with the IRS?
- The latest return in the IRS public files is the 990-EZ for the year ended December 2025.
- Who are the officers and directors of INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES?
- The 990-EZ for the year ended December 31, 2025 lists 9 people; 0 received compensation from the organization.
- How much revenue does INTERNATIONAL SOCIETY OF SYSTEMS SCIENCES have?
- On its 990-EZ for the year ended December 31, 2025 it reported revenue of $57,621, expenses of $46,553 and total assets of $76,785 at year end.
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