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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 57-1237943

MADISON MAINSTREAM RADIO INC

Tax-exempt · MADISON, WI 53711

Address and contacts

Address (IRS master file)
5601 HAMMERSLEY RD, MADISON, WI 53711-3407
In care of
% MADISON MAINSTREAM RADIO
Mailing address (990-N for 2025)
5601 HAMMERSLEY RD, MADISON WI 537113407
Principal officer (990-N for 2025)
Robert Park, 5610 Hammersley Rd, Madison WI 53711

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

Tax yearYear endedDueIRS public records
2025December 31, 2025May 15, 2026990-N on file
2024December 31, 2024May 15, 2025990-N on file
2023December 31, 2023May 15, 2024990-N on file

File the 2026 990-N for MADISON MAINSTREAM RADIO INC

Due May 17, 2027 · e-filed with the IRS by 990.tax, an IRS-authorized e-file provider

IRS record

EIN
57-1237943
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
2006
Accounting year ends
December
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Robert Park
December 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Robert Park
December 31, 2024≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Barbara S Park
December 31, 2023≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Barbara S Park
December 31, 2022≤ $50,000 receipts––e-Postcard
990-N for 2021
Officer: Barbara S Park
December 31, 2021≤ $50,000 receipts––e-Postcard
990-N for 2018
Officer: Bob Park
December 31, 2018≤ $50,000 receipts––e-Postcard
990-N for 2017
Officer: Bob Park
December 31, 2017≤ $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 57-1237943).

Questions about MADISON MAINSTREAM RADIO INC

What is the EIN of MADISON MAINSTREAM RADIO INC?
The employer identification number (EIN) of MADISON MAINSTREAM RADIO INC is 57-1237943.
Is MADISON MAINSTREAM RADIO INC tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 2006.
Are donations to MADISON MAINSTREAM RADIO INC tax-deductible?
Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does MADISON MAINSTREAM RADIO INC file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of MADISON MAINSTREAM RADIO INC due?
The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
When did MADISON MAINSTREAM RADIO INC last file with the IRS?
The latest return in the IRS public files is the 990-N for 2025 for the year ended December 31, 2025.
Who is the principal officer of MADISON MAINSTREAM RADIO INC?
The 990-N for 2025 names Robert Park.

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