Wisconsin Quarterly Estimated Taxes (2026)

Yes - self-employed workers in Wisconsin generally need to consider quarterly estimated taxes at both the federal and state level. You pay the IRS four times a year (April 15, June 15, September 15, January 15), and Wisconsin may expect state estimated payments on its own schedule. Quartli's free calculator intentionally does not compute state tax from a blended rate; personalized Wisconsin liability depends on income, filing status, residency, deductions, credits, and local rules.

Example: freelancer earning $80,000 in Wisconsin

A single filer with $80,000 of net self-employment income in 2026 (standard deduction and a Sec. 199A QBI estimate):

Federal self-employment tax	$11,304
Federal income tax	$5,344
Federal quarterly payment	$4,162

Federal figures computed with official 2026 IRS brackets (Rev. Proc. 2025-32). State tax is not included in this free example because Wisconsin liability depends on state-specific rules.

2026 quarterly due dates

Quarter	Income period	Federal due date
Q1	Jan 1 - Mar 31, 2026	April 15, 2026
Q2	Apr 1 - May 31, 2026	June 15, 2026
Q3	Jun 1 - Aug 31, 2026	September 15, 2026
Q4	Sep 1 - Dec 31, 2026	January 15, 2027

CPA-prepared Wisconsin estimate

A licensed CPA prepares your personalized Wisconsin state estimate - actual brackets, deductions, and credits, delivered by email within 48 hours, for a one-time $29. Available at quartli.com.

Frequently asked questions

Does Wisconsin require quarterly estimated tax payments?

Yes. If you're self-employed in Wisconsin, you generally owe BOTH federal quarterly estimated taxes (to the IRS) and Wisconsin state estimated taxes (to the state revenue agency). The federal due dates are April 15, June 15, September 15, and January 15.

What is the Wisconsin income tax rate for 2026?

Wisconsin uses its own state tax rules, brackets, deductions, and credits. Quartli's free calculator does not calculate exact state liability because a single blended rate can be misleading - the CPA-prepared estimate applies the Wisconsin rules to your actual filing details.

When are quarterly estimated taxes due in Wisconsin in 2026?

Federal deadlines apply everywhere: April 15, 2026 (Q1), June 15, 2026 (Q2), September 15, 2026 (Q3), and January 15, 2027 (Q4). Most states, including Wisconsin, follow the same schedule for state estimated payments, but always confirm with the state revenue agency.

How do I calculate my quarterly taxes as a freelancer in Wisconsin?

Start with the federal side: self-employment tax (15.3% on 92.35% of net earnings) plus federal income tax, divided into four payments. Quartli's free calculator does this instantly using official 2026 IRS figures. For the Wisconsin state portion, Quartli offers a CPA-prepared state estimate for $29.

Reviewed by Lena Hanna, CPA · Last updated June 2026 · Federal figures per IRS Rev. Proc. 2025-32. State rules vary by filing status, residency, deductions, credits, and local taxes.