Nonprofit · EIN 11-1630741
ADELPHI UNIVERSITY
Tax-exempt · GARDEN CITY, NY 11530
Address and contacts
- Address (IRS master file)
- 1 SOUTH AVE, GARDEN CITY, NY 11530-4213
- In care of
- % MICHAEL RHATTIGAN
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 August, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | August 31, 2026 | January 15, 2027 | Not due yet |
| 2024 | August 31, 2025 | January 15, 2026 | 990 on file |
| 2023 | August 31, 2024 | January 15, 2025 | 990 on file |
IRS record
- EIN
- 11-1630741
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- School
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1927
- Accounting year ends
- August
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Education (B430)
- Assets (IRS master file)
- $572,242,880
- Income (IRS master file)
- $407,020,630
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | August 2025 | – | – | – | IRS |
| 990-T | August 2025 | – | – | – | IRS |
| 990 | August 2024 | – | – | – | IRS |
| 990-T | August 2024 | – | – | – | IRS |
| 990 | August 2023 | $317,638,536 | $331,591,192 | $552,495,763 | IRS |
| 990-T | August 2023 | – | – | – | IRS |
| 990 | August 2022 | $329,867,300 | $322,408,391 | $560,098,244 | IRS |
| 990-T | August 2022 | – | – | – | IRS |
| 990 | August 2021 | – | – | – | IRS |
| 990-T | August 2021 | – | – | – | IRS |
| 990 | August 2020 | – | – | – | IRS |
| 990 | August 2018 | – | – | – | IRS |
990-N: the IRS publishes only the latest e-Postcard per organization; earlier years appear here as 990.tax collects the monthly files. 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.
Questions about ADELPHI UNIVERSITY
- What is the EIN of ADELPHI UNIVERSITY?
- The employer identification number (EIN) of ADELPHI UNIVERSITY is 11-1630741.
- Is ADELPHI UNIVERSITY tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1927.
- Are donations to ADELPHI UNIVERSITY tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does ADELPHI UNIVERSITY 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 ADELPHI UNIVERSITY due?
- The return for tax year 2025 (the year ending August 31, 2026) is due January 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did ADELPHI UNIVERSITY last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended August 2025.
Other nonprofits in GARDEN CITY
- WALDORF SCHOOL OF GARDEN CITY EIN 11-1855654 · last filed 990 for 2025
- AUXILIARY SERVICES ASSOCIATION OF NASSAU COMMUNITY COLLEGE INC EIN 11-2338949 · last filed 990 for 2025
- BUILDING TRADES EDUCATIONAL BENEFIT FUND EIN 11-3310063 · last filed 990 for 2024
- NASSAU COMMUNITY COLLEGE FOUNDATION INC EIN 11-2533314 · last filed 990 for 2025
- NEW YORK ACADEMY OF PUBLIC EDUCATION INC EIN 86-2305608 · last filed 990-EZ for 2024
- PAUL R ECKNA MEMORIAL FOUNDATION EIN 11-3630784 · last filed 990-EZ for 2023
- NASSAU COUNTY WOMENS BAR FOUNDATION INC EIN 13-4354023 · last filed 990-EZ for 2025
- POLISH SUPPLEMENTAL SCHOOL OF MARIA KONOPNICKA INC EIN 11-3622376 · last filed 990-EZ for 2025