Wisconsin Personal Tax Extension Guide
Form 1-ES · Individual Income Tax · Personal Filing Guide
Your Filing Status
You've Been Extended
Your Wisconsin return is extended to October 15, 2026. File now to get your refund faster.
Wisconsin grants an automatic six-month extension for filing personal income tax returns to taxpayers who have been approved for a federal extension by the IRS. The Wisconsin Department of Revenue aligns with the federal timeline, moving the state filing deadline from April 15, 2026, to October 15, 2026. No separate Wisconsin extension application is required.
Include Form 4868 or IRS Confirmation Number When FilingWhen filing your Wisconsin return by October 15, include a copy of federal Form 4868 or the IRS confirmation number you received when you filed your extension electronically. This documents your eligibility for the automatic state extension.
Payment Is Still Due by April 15Wisconsin's extension covers filing only—not payment. Any Wisconsin income tax owed must be paid by April 15, 2026, to avoid penalties and interest.
How to Make Extension Payments- ACH Debit (Free): Use the Wisconsin TAP system at tap.revenue.wi.gov/pay. This is a free service administered by the Wisconsin Department of Revenue.
- Credit Card (ACI): Pay by phone at 1-800-272-9829 or online at www.acipayonline.com. ACI charges a 2.5% convenience fee.
- Mail: Use Form 1-ES (Wisconsin Estimated Income Tax Voucher) and mail to: Wisconsin Department of Revenue, P.O. Box 268, Madison, WI 53790-0001.
Wisconsin imposes a failure-to-file penalty of 5% of unpaid tax per month, up to 25%. Wisconsin does not impose a separate failure-to-pay penalty—the filing penalty applies if no return is filed. Filing by October 15 and paying by April 15 avoids all penalties.
Best Practices- File IRS Form 4868 to secure your federal extension.
- Pay Wisconsin income tax owed by April 15, 2026, using the free ACH option at tap.revenue.wi.gov/pay.
- Include your Form 4868 or IRS confirmation number when filing your Wisconsin return by October 15.
- Wisconsin has no separate failure-to-pay penalty—focus on filing on time.
Wisconsin's extension is automatic with a federal extension. Pay by April 15, include your Form 4868 documentation when filing, and submit your return by October 15, 2026. Use the free TAP ACH option for payments.
Quick Reference Table
| State Abbreviation | WI |
| State Name | Wisconsin |
| Extension Status | Approved with Federal Extension |
| Return Due Date | April 15, 2026 |
| Extended Due Date | October 15, 2026 |
| Other Information |
|
| Online Payment | Wisconsin | Online Tax Extension Payment |
| Payment Voucher Title | Form 1-ES | Wisconsin Estimated Income Tax Voucher |
| State Payment Agency | Wisconsin Department of Revenue |
| Mailing Address with Payment | Wisconsin Department of Revenue P.O. Box 268 Madison, WI 53790-0001 |
| Online Payment Options | Credit Card | ACI at www.acipayonline.com or call 1-800-272-9829. 2.5% convenience fee. |
| Online Payment Options | ACH Debit | TAP at tap.revenue.wi.gov/pay. Free. No fee. |
| Failure to File Penalties | 5% of unpaid tax per month, up to 25%. |
| Failure to Pay Penalties | No separate failure-to-pay penalty in Wisconsin. |
IRS Authorized e-File Provider
Ready to File Your Wisconsin Return?
Complete your return through EasyTaxReturns.com. IRS-authorized, works on any device, direct deposit for refunds. October 15, 2026 deadline — don't leave it to the last minute.
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