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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 23-7089801

MOUNT DIABLO BIRD ALLIANCE

Tax-exempt · WALNUT CREEK, CA 94597

Address and contacts

Address (IRS master file)
PO BOX 53, WALNUT CREEK, CA 94597-0053
In care of
% STEVE BUFFI
Mailing address (990-N for 2025)
PO Box 53, Walnut Creek CA 94597
Principal officer (990-N for 2025)
STEVE BUFFI, PO Box 53, Walnut Creek CA 94597

California records

California keeps its own records of charities and corporations. Search them by EIN 23-7089801 or by the name MOUNT DIABLO BIRD ALLIANCE.

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 MOUNT DIABLO BIRD ALLIANCE

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

IRS record

EIN
23-7089801
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
1970
Accounting year ends
June
Files
Form 990-N (e-Postcard)
Category (NTEE)
Environment (C300)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: STEVE BUFFI
June 30, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: STEVE BUFFI
June 30, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: STEVE BUFFI
June 30, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: STEVE BUFFI
June 30, 2023≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: STEVE BUFFI
June 30, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: STEVE BUFFI
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 23-7089801).

Questions about MOUNT DIABLO BIRD ALLIANCE

What is the EIN of MOUNT DIABLO BIRD ALLIANCE?
The employer identification number (EIN) of MOUNT DIABLO BIRD ALLIANCE is 23-7089801.
Is MOUNT DIABLO BIRD ALLIANCE tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1970.
Are donations to MOUNT DIABLO BIRD ALLIANCE tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does MOUNT DIABLO BIRD ALLIANCE file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of MOUNT DIABLO BIRD ALLIANCE 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 MOUNT DIABLO BIRD ALLIANCE 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 MOUNT DIABLO BIRD ALLIANCE?
The 990-N for 2025 names STEVE BUFFI.

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