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Wisconsin Watch partners with Gigafact to produce fact briefs — bite-sized fact checks of trending claims. Read our methodology to learn how we check claims.


Among Midwestern states, Minnesota has the highest income tax rate in the highest-income tax bracket — 9.85% for an individual with annual income over $183,340.

Wisconsin is next, at 7.65%, for individuals earning over $304,170.

Illinois and Michigan both have flat tax rates of 4.95% and 4.25%, respectively. Iowa currently has a 6% top tax bracket but is phasing in a 3.9% flat rate by tax year 2026.

The Wisconsin Legislature approved a 2023-25 state budget, awaiting action by Gov. Tony Evers, that would eliminate one of the four tax brackets and reduce all income tax rates.

Wisconsin’s top rate would drop to 6.5%. Residents earning $1 million or more would save an average $30,286.

A Wisconsin 3.25% flat tax would raise gross state product 4.5% and after-tax household income 5.27% and drop tax revenue 16.8%, the University of Wisconsin-Madison Center for Research on the Wisconsin Economy said in a February 2023 report.

This Fact Brief is responsive to conversations such as this one.


Minnesota Department of Revenue Minnesota Income Tax Rates and Brackets

Tax Foundation State Individual Income Tax Rates and Brackets for 2023

Iowa Department of Revenue 2023 Changes to Iowa Individual Income Tax

Federation of Tax Administrators State Individual Income Taxes

Wisconsin State Legislature Fiscal Estimate — 2023 Session

CROWE The Economic Impact of Lowering Income Tax Rates in Wisconsin

DrydenWire (3:25) Senator Romaine Quinn Talks Wisconsin Budget

Wisconsin State Legislature General Fund Taxes Omnibus Motion

Iowa Department of Revenue 2023 Changes to Iowa Individual Income Tax

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Tom Kertscher joined as a Wisconsin Watch fact checker in January 2023 and contributes to our collaboration with the The Gigafact Project to fight misinformation online. Kertscher is a former longtime newspaper reporter, including at the Milwaukee Journal Sentinel, who has worked as a self-employed journalist since 2019. His gigs include contributing writer for PolitiFact and sports freelancer for The Associated Press.