The charts below show the due dates for 2016 tax returns affected by the Act. And note: If you owed taxes on your 2019 return, they were due by July 15. Note: When a reporting due date happens to fall on Saturday, Sunday, or a legal holiday, the reporting due date becomes the next business day. For applicable taxes, quarterly reports are due in April, July, October and January.
On Thursday, March 9, Governor Scott Walker signed 2017 Wisconsin Act 2 which conforms Wisconsin due dates with federal due dates for corporate and partnership income and franchise tax returns, as well as estimated tax payments. Due dates on this chart are adjusted for Saturdays, Sundays, and 2022 federal legal holidays.