Illinois Income Tax Calculator
Estimate how much income tax you'll pay in Illinois — federal, FICA and Illinois's flat state income tax.
Estimate only. Based on 2024 federal brackets, FICA and an approximate average state rate. Your exact tax depends on deductions, credits and local taxes.
Illinois state income tax
Illinois charges a flat state income tax of 4.95% on all earners regardless of income level, which makes its state tax simple to estimate.
Local taxes & other deductions
Illinois does not impose a separate local income tax on wages in most jurisdictions.
Effective vs. marginal tax rate
Your marginal rate is the tax on your next dollar of income — the top federal bracket you reach. Your effective rate is your total tax divided by your income, which is always lower because the first brackets are taxed at lower rates. The calculator above shows both.
Want to see your take-home pay instead? Illinois paycheck calculator.
Estimate only. Actual tax depends on deductions, credits, local taxes and other factors. This tool is for educational use, not tax advice.
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