State of Wisconsin Business Income Tax Extensions

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General Instructions

Wisconsin corporation tax returns are due by the 15th day of the 3rd month after the end of the tax year. For calendar year filers, this date is March 15. If you cannot file on time, you can get a Wisconsin tax extension.

If you have filed an IRS business tax extension online or mailed in (IRS Form 7004), you will automatically receive a Wisconsin business extension. This will extend your Wisconsin filing deadline by 7 months to 30 days beyond the Federally extended due date. There is no form that you need to file with the State to obtain a Wisconsin business tax extension and you do not need to send in a copy of your federal extension, but make sure to attach a copy of your approved Federal business tax extension to your Wisconsin tax return when it’s filed.

If you don’t have a Federal extension, you can obtain a Wisconsin-only tax extension of 7 months OR until the original deadline of the corresponding Federal corporation return, whichever date is later.

An extension of time to file is NOT an extension of time to pay. Your Wisconsin tax must be paid by the original due date (March 15) or interest and penalties will be charged. To make a Wisconsin extension payment, use Form Corp-ES (Wisconsin Corporation Estimated Tax Voucher).

NOTE: Wisconsin partnership tax returns are due by the 15th day of the 4th month after the end of the tax year (April 15 for calendar year filers). A partnership can obtain a 5-month Wisconsin tax extension. If the partnership has a valid Federal extension (IRS Form 7004), a Wisconsin extension will be automatically granted. Otherwise, partnerships can request a Wisconsin tax extension by completing a copy of Federal Form 7004 or a written statement indicating which Federal extension provision you are utilizing, and attaching that to their Wisconsin return when it’s filed.

For more information on Wisconsin corporation tax returns, please visit the Wisconsin Department of Revenue website at: www.revenue.wi.gov

Wisconsin State Income Tax Extension Forms

Form Corp-ES (Wisconsin Corporation Estimated Tax Voucher): https://www.revenue.wi.gov/TaxForms2017through2019/2018-FormCorpES.pdf 

Form Corp-ES Instructions: https://www.revenue.wi.gov/TaxForms2017through2019/2018-FormCorp-ES-inst.pdf 

Mail with payment to the following address:

Wisconsin Department of Revenue
P.O. Box 930208
Milwaukee, WI  53293-0208

You may also make Wisconsin business tax extension and estimated tax payements online at: https://tap.revenue.wi.gov/mta/_/ 


Corporation Franchise / Income Tax Assistance
P.O. Box 8906
Madison, WI 53708-8906

Phone: (608) 266-2772

Fax: (608) 267-0834

Email any questions to: [email protected]