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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 13-3734533

INFECTIOUS DISEASES SOCIETY OF NEW YORK INC

Tax-exempt · OLD GREENWICH, CT 06870

Address and contacts

Address (IRS master file)
240 PALMER HILL RD, OLD GREENWICH, CT 06870-1012
In care of
% DAVID LUKE
Mailing address (990-N for 2024)
240 Palmer Hill Road, Old Greenwich CT 06870
Principal officer (990-N for 2024)
Anna Kaltsas, 240 Palmer Hill Road, Old Greenwich CT 06870

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 August, so each return is due on the 15th day of the 5th month after that.

Tax yearYear endedDueIRS public records
2025August 31, 2026January 15, 2027Not due yet
2024August 31, 2025January 15, 2026990-N on file
2023August 31, 2024January 15, 2025990-N on file

File the 2025 990-N for INFECTIOUS DISEASES SOCIETY OF NEW YORK INC

Due January 15, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
13-3734533
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
1995
Accounting year ends
August
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2024
Officer: Anna Kaltsas
August 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Anna Kaltsas
August 31, 2024≤ $50,000 receipts––e-Postcard
990-EZAugust 2023–––IRS
990-N for 2021
Officer: Anna Kaltsas
August 31, 2022≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Anna Kaltsas
August 31, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Anna Katlsas MD
August 31, 2020≤ $50,000 receipts––e-Postcard
990-N for 2018
Officer: Anna Kaltsas MD MS
August 31, 2019≤ $50,000 receipts––e-Postcard

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 13-3734533).

Questions about INFECTIOUS DISEASES SOCIETY OF NEW YORK INC

What is the EIN of INFECTIOUS DISEASES SOCIETY OF NEW YORK INC?
The employer identification number (EIN) of INFECTIOUS DISEASES SOCIETY OF NEW YORK INC is 13-3734533.
Is INFECTIOUS DISEASES SOCIETY OF NEW YORK INC tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1995.
Are donations to INFECTIOUS DISEASES SOCIETY OF NEW YORK INC tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does INFECTIOUS DISEASES SOCIETY OF NEW YORK INC file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of INFECTIOUS DISEASES SOCIETY OF NEW YORK INC 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 INFECTIOUS DISEASES SOCIETY OF NEW YORK INC last file with the IRS?
The latest return in the IRS public files is the 990-N for 2024 for the year ended August 31, 2025.
Who is the principal officer of INFECTIOUS DISEASES SOCIETY OF NEW YORK INC?
The 990-N for 2024 names Anna Kaltsas.

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