Nonprofit Tax Deadlines in Wisconsin
Federal and state filing dates, extensions, and estimate schedules for 2026.
Wisconsin filing deadline
Nonprofit annual return generally due the 15th day of the 5th month.
Due: May 15, 2026
Extension: Nov 15, 2026
Form: State nonprofit return
Estimated payments
No state estimated payment schedule listed.
Due: N/A
FAQ
Does Wisconsin require Nonprofit estimated payments?
Estimated payments are not typically required at the entity level, but confirm with Wisconsin Department of Revenue.
Where can I file Wisconsin Nonprofit taxes?
Use Wisconsin Department of Revenue resources at https://www.revenue.wi.gov for forms and filing instructions.