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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 83-1800594

ISAURA STRING QUARTET

Tax-exempt · GLENDALE, CA 91205

Address and contacts

Address (IRS master file)
1118 E PALMER AVE APT 209, GLENDALE, CA 91205-4413
In care of
% BETSY RETTIG
Mailing address (990-N for 2025)
1118 East Palmer Avenue Unit 209, Glendale CA 91205
Principal officer (990-N for 2025)
Zeynep Yeldan, 1118 East Palmer Avenue Unit 209, Glendale CA 91205

California records

California keeps its own records of charities and corporations. Search them by EIN 83-1800594 or by the name ISAURA STRING QUARTET.

Attorney General, Registry of Charities and Fundraisers
Registration status and filed reports (CT-TR-1, RRF-1)

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

Tax yearYear endedDueIRS public records
2025June 30, 2026November 16, 2026990-N on file
2024June 30, 2025November 17, 2025990-N on file
2023June 30, 2024November 15, 2024990-N on file

File the 2026 990-N for ISAURA STRING QUARTET

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

IRS record

EIN
83-1800594
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
2018
Accounting year ends
June
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Zeynep Yeldan
June 30, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Zeynep Yeldan
June 30, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Madeline Falcone
June 30, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Madeline Falcone
June 30, 2023≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Madeline Falcone
June 30, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Madeline Falcone
June 30, 2020≤ $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 83-1800594).

Questions about ISAURA STRING QUARTET

What is the EIN of ISAURA STRING QUARTET?
The employer identification number (EIN) of ISAURA STRING QUARTET is 83-1800594.
Is ISAURA STRING QUARTET tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2018.
Are donations to ISAURA STRING QUARTET tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does ISAURA STRING QUARTET file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of ISAURA STRING QUARTET due?
The return for tax year 2026 (the year ending June 30, 2027) is due November 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did ISAURA STRING QUARTET last file with the IRS?
The latest return in the IRS public files is the 990-N for 2025 for the year ended June 30, 2026.
Who is the principal officer of ISAURA STRING QUARTET?
The 990-N for 2025 names Zeynep Yeldan.

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