Wisconsin LLC annual report & franchise tax deadlines 2026-2027
Every recurring Wisconsin filing for LLCs, S corps and C corporations — due dates, fees and the official source for each. Last verified Oct 21, 2026.
LLC
| Report | Annual Report Confirmed on official page |
|---|---|
| Due | By the end of the calendar quarter containing the formation anniversary |
| State fee | $25 online / $40 paper |
| How often | annual |
Corporation (C & S corp)
| Report | Annual Report Confirmed on official page |
|---|---|
| Due | By the end of the calendar quarter containing the incorporation anniversary |
| State fee | $25 online / $40 paper |
| How often | annual |
Franchise & entity-level taxes
| No separate statewide franchise or entity-level tax listed for this state. |
State income & estimated tax
| Corporate income tax | Yes |
|---|---|
| C corp return | Apr 15 (Form 4 / 6) |
| Partnership / S corp return | Mar 15 (Form 3 / 5S) |
| Corporate estimates | Apr 15, Jun 15, Sep 15, Dec 15 (follows the federal corporate schedule) |
General pattern — verify Calendar-year pattern; confirm with the revenue department.
Sales tax
Filing frequency (monthly, quarterly or annual) is assigned by the state based on your tax liability. Returns are generally due the last day of the month after the reporting period.
General pattern — verify Your assigned frequency and due day appear in your state tax account.
IRS disaster postponements in Wisconsin
- WI-2026-03: federal deadlines postponed to Feb 1, 2027 (incident began Jul 27, 2026) — Forest, Outagamie, Vilas, and Winnebago counties
- WI-2026-02: federal deadlines postponed to Nov 2, 2026 (incident began Apr 13, 2026) — see IRS notice for affected areas
IRS relief is federal. Whether Wisconsin follows the postponement for state returns varies — check the state revenue department.
Your Wisconsin calendar
Add your formation month/year to date anniversary-based reports. Calendar-year filers; weekend and federal-holiday dates roll to the next business day.
Upcoming deadlines
Not tax advice — verify each date with the linked source. Fiscal-year filers' dates differ.
Tools that help you stay compliant
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Wisconsin deadline FAQ
When is the Wisconsin LLC annual report due?
By the end of the calendar quarter containing the formation anniversary.
How much does the Wisconsin LLC annual report cost?
State fee: $25 online / $40 paper.
When is the Wisconsin corporation annual report due?
By the end of the calendar quarter containing the incorporation anniversary. Fee: $25 online / $40 paper. S corporations file the same report as other corporations.
Does Wisconsin have a franchise tax or annual LLC tax?
We don't list a separate statewide franchise or entity-level tax for Wisconsin. Income and sales taxes may still apply.
When are Wisconsin business income tax returns due?
C corporations: Apr 15 (Form 4 / 6). Pass-through entities (partnerships, S corps): Mar 15 (Form 3 / 5S). These are general calendar-year patterns — confirm with the state revenue department.
How often do I file Wisconsin sales tax?
Filing frequency (monthly, quarterly or annual) is assigned by the state based on your tax liability. Returns are generally due the last day of the month after the reporting period.
What happens if I miss a Wisconsin deadline?
Most states charge a late fee or penalty and interest, and an entity that keeps missing its annual report can lose good standing and eventually be administratively dissolved. Check the official source for the exact penalty and reinstatement steps.
Official sources
- https://dfi.wi.gov/Pages/BusinessServices/BusinessEntities/FAQ.aspx
- https://www.revenue.wi.gov
- https://dfi.wi.gov/Pages/BusinessServices/BusinessEntities/Fees.aspx
- https://dfi.wi.gov/Pages/BusinessServices/BusinessEntities/FileOnline.aspx
- https://dfi.wi.gov/Documents/BusinessServices/BusinessEntities/Forms/CORP5i.pdf
Federal dates: IRS Publication 509. Disaster relief: IRS tax relief in disaster situations.
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