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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 23-7163206

NORTHERN CALIFORNIA GEOLOGICAL SOCIETY

Tax-exempt · DANVILLE, CA 94526

Address and contacts

Address (IRS master file)
146 ROAN DR, DANVILLE, CA 94526-1915
In care of
% PHILIP REED
Mailing address (990-N for 2025)
146 Roan Dr, Danville CA 94526
Principal officer (990-N for 2025)
Donald A Medwedeff, 146 Roan Dr, Danville CA 94526

California records

California keeps its own records of charities and corporations. Search them by EIN 23-7163206 or by the name NORTHERN CALIFORNIA GEOLOGICAL SOCIETY.

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 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, 2027990-N on file
2024August 31, 2025January 15, 2026990-N on file
2023August 31, 2024January 15, 2025990-N on file

File the 2026 990-N for NORTHERN CALIFORNIA GEOLOGICAL SOCIETY

Due January 18, 2028 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
23-7163206
Tax-exempt status
501(c)(6): Business league or chamber of commerce
Donations deductible
No
Exempt since
1973
Accounting year ends
August
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Donald A Medwedeff
August 31, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Donald A Medwedeff
August 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Donald A Medwedeff
August 31, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Donald Medwedeff
August 31, 2023≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Donald Medwedeff
August 31, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: Don Medwedeff
August 31, 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 23-7163206).

Questions about NORTHERN CALIFORNIA GEOLOGICAL SOCIETY

What is the EIN of NORTHERN CALIFORNIA GEOLOGICAL SOCIETY?
The employer identification number (EIN) of NORTHERN CALIFORNIA GEOLOGICAL SOCIETY is 23-7163206.
Is NORTHERN CALIFORNIA GEOLOGICAL SOCIETY tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(6) since 1973.
Are donations to NORTHERN CALIFORNIA GEOLOGICAL SOCIETY tax-deductible?
No. The IRS master file says contributions to it are not deductible.
Which annual return does NORTHERN CALIFORNIA GEOLOGICAL SOCIETY file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of NORTHERN CALIFORNIA GEOLOGICAL SOCIETY due?
The return for tax year 2026 (the year ending August 31, 2027) is due January 18, 2028. Form 8868 extends it by six months; the 990-N cannot be extended.
When did NORTHERN CALIFORNIA GEOLOGICAL SOCIETY last file with the IRS?
The latest return in the IRS public files is the 990-N for 2025 for the year ended August 31, 2026.
Who is the principal officer of NORTHERN CALIFORNIA GEOLOGICAL SOCIETY?
The 990-N for 2025 names Donald A Medwedeff.

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