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IRS-authorized e-file provider · not the IRS

Nonprofit · EIN 39-1809434

WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC

Tax-exempt · MAUSTON, WI 53948

Address and contacts

Address (IRS master file)
N4488 POWERS AVE PMB 3018, MAUSTON, WI 53948-9472
In care of
% GREG PETERSON
Mailing address (990-N for 2025)
N4488 Powers Ave PMB 3018, Mauston WI 53948
Principal officer (990-N for 2025)
Robert Wilder, 830 State Road 136 Ste 1 Box 2103, Baraboo WI 53913

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 WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC

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

IRS record

EIN
39-1809434
Tax-exempt status
501(c)(6): Business league or chamber of commerce
Donations deductible
No
Exempt since
2021
Accounting year ends
December
Files
Form 990-N (e-Postcard)

Filing history

FormYear endedRevenueExpensesAssetsReturn
990-N for 2025
Officer: Robert Wilder
December 31, 2025≤ $50,000 receipts––e-Postcard
990-N for 2024
Officer: Robert Wilder
December 31, 2024≤ $50,000 receipts––e-Postcard
990-N for 2023
Officer: Robert Wilder
December 31, 2023≤ $50,000 receipts––e-Postcard
990-N for 2022
Officer: Robert Wilder
December 31, 2022≤ $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 39-1809434).

Questions about WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC

What is the EIN of WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC?
The employer identification number (EIN) of WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC is 39-1809434.
Is WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC tax-exempt?
Yes. The IRS lists it as tax-exempt under section 501(c)(6) since 2021.
Are donations to WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC tax-deductible?
No. The IRS master file says contributions to it are not deductible.
Which annual return does WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC file?
Form 990-N (e-Postcard). Gross receipts normally $50,000 or less.
When is the next return of WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS 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 WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS 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 WISCONSIN CHAPTER OF INTL ASSOC OF SPECIAL INVESTIGATION UNITS INC?
The 990-N for 2025 names Robert Wilder.

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