Avoid penalties and fees: Tax return extension deadline is October 15th

MILWAUKEE -- Taxpayers who have an extension must file their individual income tax return with the Wisconsin Department of Revenue by Thursday, October 15 to avoid penalties and fees.

Taxpayers who filed an extension with the IRS automatically receive a Wisconsin extension. When filing, you must attach a copy of the IRS extension to your Wisconsin tax return. Please keep a copy of the IRS extension application, Form 4868, for your records.

Important things to know:


    Visit www.revenue.wi.gov/individuals for tools and resources related to filing returns, making payments, and requesting payment plans.