How do I file a Wisconsin extension?
Wisconsin will accept your federal extension. If you expect to owe taxes to Wisconsin, you'll need to pay that amount by April 15, 2026, to avoid penalties and interest. You can mail a check or money order with a completed Wisconsin 2025 Form 1-ES or pay by credit card, Apple Pay, or PayPal by going to Wisconsin's website to enter some basic information. You will then be directed to a third-party processor to complete your payment.
To file a federal extension or for help filling out Form 1-ES to pay any Wisconsin tax due by the due date: Menu Path: Account > File an Extension
To file a federal extension or for help filling out Form 1-ES to pay any Wisconsin tax due by the due date: Menu Path: Account > File an Extension
