Wisconsin Estimated Tax Payments (2026)

Do you have to pay estimated taxes in Wisconsin?

Yes. If you're self-employed in Wisconsin and expect to owe $500 or more in Wisconsin income tax for 2026 after withholding, you must make quarterly estimated payments to the Wisconsin Department of Revenue. That is below the federal $1,000 threshold, so most part-time self-employed people owe them too. Wisconsin taxes income at graduated rates up to 7.65%.

When are Wisconsin estimated taxes due in 2026?

Wisconsin's 2026 quarterly payments are due April 15, June 15, September 15, and January 15, in four equal installments, on the same calendar as your federal payments.

• Q1, April 15, 2026

• Q2, June 15, 2026

• Q3, September 15, 2026

• Q4, January 15, 2027

How much should you set aside for Wisconsin estimated taxes?

Plan to set aside 25% to 30% of your net self-employment profit to cover federal and Wisconsin taxes combined, then confirm the exact amount with the calculator above. On $50,000 of net self-employment profit, federal self-employment tax alone is about $7,065 (15.3% on 92.35% of your earnings). On top of that you'll owe federal income tax and Wisconsin income tax at graduated rates up to 7.65%.

How do you avoid Wisconsin underpayment interest?

To avoid Wisconsin underpayment interest, pay the smaller of 90% of your 2026 Wisconsin tax or 100% of your 2025 tax, in four on-time installments. Paying the full amount late doesn't help; each installment has to be on time. You can estimate a federal underpayment penalty here.

What deductions lower your Wisconsin estimated taxes?

Because estimated taxes are based on your net profit, every business write-off you claim lowers what you owe each quarter. Common deductions for 1099 workers, reported on Schedule C, include the home-office deduction, car mileage, phone and internet, software, and supplies. Like the IRS, Wisconsin lets you deduct half of your self-employment tax. The federal Qualified Business Income (QBI) deduction can remove up to 20% of your qualified business income from your federal taxes, but Wisconsin doesn’t allow it, so it doesn’t lower your Wisconsin tax.

Keeper's 1099 tax calculator estimates your bill after deductions, and our write-off guides list the deductions for your line of work.

Note: Figures are current for the 2026 tax year and are for planning, not tax advice. Confirm the details with the Wisconsin Department of Revenue before you file.

How to file quarterly taxes in Wisconsin

Filing quarterly in Wisconsin means two separate payments each period: one to the IRS for federal tax, and one to the Wisconsin Department of Revenue for your state taxes. Here’s how to do it.

1. Confirm you need to pay. You owe estimated payments when tax isn’t withheld from enough of your income — 1099 or freelance work, investment income, or other untaxed income. Federal and Wisconsin run separate tests: the state generally requires estimated payments if you expect to owe $500 or more in Wisconsin tax after withholding and credits, subject to its safe-harbor rules.
2. Calculate your federal estimate. Use the Form 1040-ES worksheet (or tax software). Estimate your full-year income, add your federal income tax and self-employment tax, subtract anything already withheld from a paycheck, and split the rest across the year. The estimate at the top of this page gives you a starting number.
3. Calculate your Wisconsin estimate separately. Work out your Wisconsin amount on its own using Form 1-ES. Don’t just send part of your federal payment to the state — the Wisconsin calculation is separate, based on your Wisconsin income tax, credits, and any Wisconsin withholding.
4. Pay the IRS. Pay through IRS Direct Pay (or EFTPS) and choose the estimated tax / Form 1040-ES option. Select tax year 2026 and save the confirmation number. This money counts only toward your federal taxes.
5. Pay Wisconsin separately. Make a second payment to My Tax Account and select the Form 1-ES estimated payment for 2026. Save that confirmation too. This money counts only toward your Wisconsin taxes.
6. Repeat on each deadline. For 2026, federal estimated payments are due April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. Wisconsin uses those same four dates.

Steps reflect 2026 rules and are for planning, not tax advice.