Nonprofit · EIN 52-1271342
WILLI HENNIG SOCIETY
Tax-exempt · BRONX, NY 10458
Address and contacts
- Address (IRS master file)
- 2900 SOUTHERN BLVD, BRONX, NY 10458-5126
- In care of
- % MARK SIDDALL
- Mailing address (990-N for 2024)
- 2900 Southern Blvd, Bronx NY 10458
- Principal officer (990-N for 2024)
- Dennis Stevenson, 2900 Southern Blvd, Bronx NY 10458
- Website
- https://cladistics.org
What it must file and when
IRS records say it files Form 990-N (e-Postcard). Gross receipts normally $50,000 or less. 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 | Not on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990-N on file |
| 2023 | December 31, 2023 | May 15, 2024 | Check at the IRS |
IRS record
- EIN
- 52-1271342
- 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
- 1999
- Accounting year ends
- December
- Files
- Form 990-N (e-Postcard)
- Category (NTEE)
- Science and technology (U035)
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-N for 2024 Officer: Dennis Stevenson | December 31, 2024 | ≤ $50,000 receipts | – | – | e-Postcard |
| 990 | December 2022 | $49,610 | $30,092 | $449,827 | IRS |
| 990 | December 2021 | $75,086 | $11,987 | $430,309 | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
| 990 | December 2017 | – | – | – | 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 52-1271342).
Questions about WILLI HENNIG SOCIETY
- What is the EIN of WILLI HENNIG SOCIETY?
- The employer identification number (EIN) of WILLI HENNIG SOCIETY is 52-1271342.
- Is WILLI HENNIG SOCIETY tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1999.
- Are donations to WILLI HENNIG SOCIETY tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does WILLI HENNIG SOCIETY file?
- Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
- When is the next return of WILLI HENNIG SOCIETY due?
- The return for tax year 2025 (the year ending December 31, 2025) is due May 15, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did WILLI HENNIG SOCIETY last file with the IRS?
- The latest return in the IRS public files is the 990-N for 2024 for the year ended December 31, 2024.
- Who is the principal officer of WILLI HENNIG SOCIETY?
- The 990-N for 2024 names Dennis Stevenson.
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