Nonprofit · EIN 35-2464610
MEMORIAL SLOAN KETTERING CANCER CENTER
Also known as MSKCC PROPERTIES LLC
Tax-exempt · NEW YORK, NY 10065
Address and contacts
- Address (IRS master file)
- 1275 YORK AVE, NEW YORK, NY 10065-6007
- In care of
- % KEVIN MALARKEY
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 | Not on file |
| 2024 | December 31, 2024 | May 15, 2025 | Check at the IRS |
| 2023 | December 31, 2023 | May 15, 2024 | Check at the IRS |
IRS record
- EIN
- 35-2464610
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Hospital or medical research organization
- Exempt since
- 1962
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Medical research (H30)
- Group exemption
- 3475: MEMORIAL SLOAN-KETTERING CANCER CENTER
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990-T | December 2024 | – | – | – | IRS |
| 990-T | December 2023 | – | – | – | IRS |
| 990-T | December 2022 | – | – | – | IRS |
| 990-T | December 2021 | – | – | – | IRS |
| 990-T | December 2020 | – | – | – | 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 35-2464610).
Questions about MEMORIAL SLOAN KETTERING CANCER CENTER
- What is the EIN of MEMORIAL SLOAN KETTERING CANCER CENTER?
- The employer identification number (EIN) of MEMORIAL SLOAN KETTERING CANCER CENTER is 35-2464610.
- Is MEMORIAL SLOAN KETTERING CANCER CENTER tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1962.
- Which annual return does MEMORIAL SLOAN KETTERING CANCER CENTER 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 MEMORIAL SLOAN KETTERING CANCER CENTER 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 MEMORIAL SLOAN KETTERING CANCER CENTER last file with the IRS?
- There is no e-filed return or e-Postcard for it in the IRS public files.
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