Wisconsin pass through entity return

File the Wisconsin pass through entity return with the Wisconsin Department of Revenue by the 15th day of the 3rd month after the fiscal year ends (March 15 for a calendar year), with the owners' state K-1s.

When: By the 15th day of the 3rd month after the fiscal year ends (March 15 for a calendar year).
Agency: Wisconsin Department of Revenue
Applies to: S corporations, partnerships and LLCs taxed as partnerships registered in Wisconsin.
Source: www.revenue.wi.gov, read October 22, 2026

Jay explains

An S corporation or partnership doing business in Wisconsin files a state information return by the 15th day of the 3rd month after the fiscal year ends (March 15 for a calendar year), alongside the federal return, so the owners can report their shares on their own Wisconsin returns. Some states charge a minimum tax or filing fee with it; check the Wisconsin Department of Revenue page.

Next dates

For a calendar year company. Shown as the agency states them; if a date falls on a weekend, file before it.

March 15, 2027
March 15, 2028

Also in Wisconsin

Wisconsin annual report Wisconsin annual report Wisconsin annual report Wisconsin nonprofit annual report Wisconsin charitable organization credential renewal Wisconsin charitable organization annual financial report Wisconsin corporate income tax return Wisconsin corporate estimated tax payment Wisconsin personal income tax return with business income Wisconsin unemployment insurance wage report Wisconsin annual withholding reconciliation Wisconsin sales tax return

See it on your company's calendar

Your company's compliance calendar

Three answers to start. Refine it after.

What kind of organization is it?

An LLC's tax treatment decides which federal return it files. Choose the line that matches yours. Nonprofits are covered too.

State of formation

Employees

Count everyone on payroll. An S corporation's working owners are employees: they are paid a salary.

Where is it based? The state of the office, or of most of the people

A company based outside its state of formation is registered in both and files in both.

More about the company: other states, payroll, dates, abroad

Company name

Date registered in each other state

Optional. Some states key their report to the day you registered there rather than your date of formation; without it, the formation date stands in and the calendar says so.

Who runs payroll?

Fiscal year ends in

Date of formation

Wisconsin keys its report to this date. Add it and the calendar places it.

Annual revenue

Some taxes start at a revenue threshold.

We pay independent contractors We offer a retirement plan (401(k), SIMPLE, SEP)

Outside the United States We hold a bank or financial account outside the US A person or company outside the US owns 25% or more of it We own 10% or more of a company outside the US We pay people or companies outside the US

Each adds the FinCEN or IRS form that comes with it: the FBAR, Form 5472, Form 5471, Forms 1042 and 1042-S.

No account needed. Nothing is stored until you save it.

Put it in your calendar

The calendar is free to read and to print. A subscription keeps it alive.

Every date in Google Calendar, Outlook or Apple Calendar, updated when a rule changes
Email reminders 30 days, 7 days and 1 day before each date, and on the day
Your bookkeeper, your office manager, your CPA: invite anyone, unlimited
Mark each filing done and keep a filing record you can send a lender or a buyer
Every change in federal or state rules that touches your company, explained
Jay's plain English notes on every obligation

$190 a year ($15.83 a month), or $19 month to month

Put it in my calendar

Advisors: $49 a month for up to ten companies, $4 each after. Details