Tax Filing Extensions For Paper and Electronically Submitted Returns

The due dates for filing and making payments for certain 2020 income tax returns have changed. The documents on this web page may not reflect the new due dates. For information on the new filing and payment due dates, see the article 2020 Wisconsin Tax Return Due Dates and Payments.

Applicable Laws and Rules

This document provides statements or interpretations of the following laws and regulations enacted as of March 31, 2021: Sections 71.03, 71.09, 71.24, 71.29, 71.44, 71.775, 73.03 and 77.58, Wis. Stats., secs. Tax 2.88 and 2.96, Wis. Adm. Code, and 26 U.S. Code §§ 7508 and 7508A.

Laws enacted and in effect after March 31, 2021, new administrative rules, and court decisions may change the interpretations in this document. Guidance issued prior to March 31, 2021, that is contrary to the information in this document is superseded by this document, pursuant to sec. 73.16(2)(a), Wis. Stats.


MS 5-77
Customer Service Bureau
PO Box 8949
Madison, WI 53708-8949
Phone: (608) 266-2772
Fax: (608) 267-1030
Email additional questions to

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

Guidance Document Number: 100211

March 31​, 2021