Free Tool
Illinois Income Tax Calculator
Estimate your 2026 Illinois state and federal income tax liability for W-2, self-employment, and investment income.
Total Tax Liability
for 2026
Effective Rate
14.1%
Federal Marginal
22.0%
Cap Gains Rate
15.0%
State Rate
5.0%
This calculator provides estimates based on 2026 federal and state tax rates using the standard deduction. Actual tax liability may vary based on itemized deductions, tax credits, AMT, and other factors. Consult a tax professional for personalized advice.
How Illinois taxes your income
Flat 4.95%
Illinois applies a flat 4.95% state income tax to your taxable income — the same rate at every income level — on top of federal income tax.
Illinois income tax questions.
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