Wisconsin (WI) automatically grants a filing (not payment) extension to October 15 if you filed a federal extension. If you didn't, print IRS Form 4868 and only fill out the name, address, and signature fields. Then, when you file your Wisconsin return, attach the 4868 to your return. If you owe, submit payment by May 17 to avoid penalties and interest, either by including a check with your mailed Form 1-ES or by paying online at their DOR Electronic Filing page.
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