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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 90-0266168

SIGMA THETA TAU INTERNATIONAL INC

Also known as 442 TAU MU CHAPTER

Tax-exempt · WAUKESHA, WI 53186

Address and contacts

Address (IRS master file)
100 N EAST AVE, WAUKESHA, WI 53186-3103
In care of
% JAMES LAROSA
Mailing address (990-N for 2025)
100 N East Ave, Waukesha WI 53186
Principal officer (990-N for 2025)
Mary Lou Kopp, 1920 Old CC, Hartford WI 53027

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 SIGMA THETA TAU INTERNATIONAL INC

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

IRS record

EIN
90-0266168
Tax-exempt status
501(c)(3): Charitable, religious, educational or scientific organization
Foundation status
Publicly supported organization (509(a)(2))
Exempt since
1954
Accounting year ends
June
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Mary Lou Kopp
June 30, 2026≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Mary Lou Kopp
June 30, 2025≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Amber Prochnow
June 30, 2024≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Amber Prochnow
June 30, 2023≤ $50,000 receipts––e-Postcard
990-N for 2020
Officer: Mary Lou Kopp
June 30, 2021≤ $50,000 receipts––e-Postcard
990-N for 2019
Officer: James Mikolajczak
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 90-0266168).

Questions about SIGMA THETA TAU INTERNATIONAL INC

What is the EIN of SIGMA THETA TAU INTERNATIONAL INC?
The employer identification number (EIN) of SIGMA THETA TAU INTERNATIONAL INC is 90-0266168.
Is SIGMA THETA TAU INTERNATIONAL INC tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1954.
Which annual return does SIGMA THETA TAU INTERNATIONAL INC file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of SIGMA THETA TAU INTERNATIONAL INC 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 SIGMA THETA TAU INTERNATIONAL INC 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 SIGMA THETA TAU INTERNATIONAL INC?
The 990-N for 2025 names Mary Lou Kopp.

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