Illinois Income Tax Calculator
Use this free income tax calculator customized with Illinois-specific tax rates, costs, and financial data.
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Frequently Asked Questions
What is the Illinois state income tax rate?
Illinois has a top marginal income tax rate of 4.95%. The state uses a flat tax rate on all taxable income.
Does Illinois have a flat or progressive income tax?
Illinois uses a flat income tax rate of 4.95% on all taxable income.
How do I file my Illinois state income tax return?
Illinois residents must file a state income tax return with the Illinois Department of Revenue (or equivalent agency). Most taxpayers can file electronically. The deadline typically aligns with the federal tax deadline of April 15.