Illinois is 1 of only 15 states with a flat income tax rate

Top marginal individual income tax rate in January 2025, income tax structure and rank by state.

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This map does not show effective tax rates, which would include the effects of various tax preferences. WA applies to capital gains income of high-earning individuals. Local income taxes are not included. Top rates exclude non-UI payroll taxes in CA (1.1%), MA (0.46%), and WA (0.58%), and a 1% high earners' capital gains surtax in MN.

Chart: @illinoispolicySource: The Tax FoundationCreated with Datawrapper