Form1CNS: Composite Wisconsin Individual Income Tax Return for Nonresident Tax-Option (S) Corporation Shareholders (2024)
Wisconsin · Wisconsin DOR · Used for tax years 2024
Wisconsin Form 1CNS is a composite individual income tax return for qualifying and participating nonresident shareholders of a tax-option (S) corporation. It reports their Wisconsin income or loss, tax, and withholding, and calculates the amount due or the overpayment to be refun
Who files this form
Form 1CNS is a composite Wisconsin individual income tax return for qualifying and participating nonresident shareholders of a tax-option (S) corporation.
Only qualifying shareholders may be included. The form refers to the instructions for eligibility details, but those instructions are not provided here, so the full eligibility rules cannot be determined from this text.
The corporation must have a power of attorney or other written authorization from each participating shareholder to file on their behalf.
When it's due
For tax year 2024, the printed filing due date is April 15, 2025.
What you'll need
Have the following information and records available:
- The corporation’s name, address, federal employer ID number, year-end date, and contact information.
- Each participating shareholder’s name, address, Social Security number, ownership percentage, and filing status.
- Each shareholder’s share of Wisconsin net income or loss and Wisconsin gross income. Schedule 2 identifies Schedule 5K-1, line 20, as the source for gross income.
- Federal adjusted gross income from Form 1040 and Wisconsin tax withheld from Form PW-1.
- A power of attorney or other written authorization from each qualifying and participating shareholder.
Include a copy of any application for a federal filing extension. For an amended return, include Schedule AR and provide the amounts previously paid and refunded.
Do not attach federal Form 1120S, Wisconsin Form 5S, Wisconsin Form PW-1, federal Schedules K-1, or Wisconsin Schedules 5K-1.
How to file
The supplied form is marked “Sample Form File Electronically.” It directs filers to the “Filing Methods” section of the instructions for filing details.
No electronic filing steps or mailing address are provided in the supplied text.
Common mistakes
- Including shareholders who do not qualify. The form cautions that only qualifying shareholders may be included and refers to the instructions for details.
- Attaching documents the form says to leave out. Do not attach federal Form 1120S, Wisconsin Form 5S, Wisconsin Form PW-1, federal Schedules K-1, or Wisconsin Schedules 5K-1.
- Leaving out an extension application copy. Include a copy of any application for a federal extension of time to file.
- Leaving out Schedule AR when amending. Check the amended-return box and include Schedule AR.
Questions people ask
Who receives a refund from this return?
The form states that the overpayment on Schedule 1, line 9, is refunded to the corporation.
Can someone else discuss the return with the department?
Yes. Select “Yes” in the Third Party Designee section and provide the designee’s name, phone number, and personal identification number (PIN).
What if there is not enough room to list all participating shareholders?
Schedule 2 says to attach a separate schedule if necessary.
Who signs the return?
The form provides a signature line for an authorized officer, along with the officer’s title and date. It also provides a preparer signature section.