2020 Wisconsin Tax Return Due Dates and Payments

This guidance document provides information about the effect of Internal Revenue Service (IRS) Notice 2021-21 issued as a result of the ongoing COVID-19 pandemic. See the IRS News Release for more information.


Updated Due Dates for 2020 Wisconsin Tax Returns

The following chart provides updated 2020 calendar-year Wisconsin tax return due dates as a result of IRS Notice 2021-21:

FormDue DateExtended Due Date
Form 1: Individual Income Tax ReturnMay 17, 2021October 15, 2021*
Form 1NPR: Nonresident and Part-Year Resident Individual Income Tax ReturnMay 17, 2021October 15, 2021*
Schedule H/H-EZ: Homestead Credit ClaimApril 15, 2025N/A
Form 2: Fiduciary Income Tax Return for Estates and TrustsApril 15, 2021September 30, 2021*
Form 3: Partnership ReturnMarch 15, 2021September 15, 2021
Form 1CNP: Composite Individual Income Tax Return for Nonresident PartnersMay 17, 2021October 15, 2021*
Form 4/6: Non-Combined/Combined Corporation Franchise or Income Tax ReturnApril 15, 2021November 15, 2021**
Form 4T: Exempt Corporation Franchise or Income Tax ReturnMay 17, 2021December 15, 2021**
Form 4T: Exempt Employee's Trust, IRA, MSA Fiduciary Income Tax Return for Estates and TrustsApril 15, 2021October 15, 2021*
Form 4T: Exempt Non-Employee's Trust, IRA, MSA Fiduciary Income Tax Return for Estates and TrustsMay 17, 2021December 15, 2021*
Form 5S: Tax-Option (S) Corporation Franchise or Income Tax ReturnMarch 15, 2021October 15, 2021**
Form 1CNS: Composite Wisconsin Individual Income Tax Return for Nonresident Tax-Option (S) Corporation ShareholdersMay 17, 2021October 15, 2021*
Form PW-1: Partnerships – Nonresident Income or Franchise Tax Withholding on Pass-Through Entity IncomeMarch 15, 2021October 15, 2021*
Form PW-1: Tax-Option (S) Corporation – Nonresident Income or Franchise Tax Withholding on Pass-Through Entity IncomeMarch 15, 2021October 15, 2021*
Form PW-1: Estates and Trusts – Nonresident Income or Franchise Tax Withholding on Pass-Through Entity IncomeApril 15, 2021November 15, 2021**

* Pursuant to sec. 71.03(7), Wis. Stats., extension of time to file returns of natural persons and fiduciaries is subject to the time granted by the Internal Revenue Service (IRS). The extended due dates provided are based on the IRS extended due dates as of March 29, 2021.

** Pursuant to secs. 71.24(7)(a) and 71.775(4)(bm)1., Wis. Stats., corporations and pass-through withholding tax returns are granted an automatic seven-month extension.

Applicable Laws and Rules

This document provides statements or interpretations of ch. 71, Wis. Stats. , enacted as of March 30, 2021. Laws enacted and in effect after this date, new administrative rules, and court decisions may change the interpretations in this document. Guidance issued prior to this date that is contrary to the information in this document is superseded by this document, pursuant to sec. 73.16(2)(a), Wis. Stats.

​​​Contact Us

MS 5-77
Wisconsin Department of Revenue​
Customer Service Bureau
PO Box 8949
Madison, WI 53708-8949
Phone: (608) 266-2776
Fax: (608) 267-1030
Email: ​ ​ DORBusinessTax@wisconsin.gov

The department welcomes your input on our guidance. Submit comments on this guidance document.

Guidance Document Number: 100262

April 20, 2021