Illinois Paycheck Calculator
Estimate your Illinois take-home pay after federal tax, FICA and Illinois state income tax. Illinois charges a flat state income tax rate for all earners.
Estimate only. Based on 2024 federal brackets, FICA, and an approximate average state rate. Actual withholding depends on allowances, pre-tax deductions and local taxes.
Illinois state income tax
Illinois uses a flat state income tax of 4.95% regardless of income level.
Local taxes & deductions
Illinois does not impose a separate local income tax on wages in most jurisdictions.
Federal tax & FICA
Because the Illinois rate is flat, the shape of your withholding is driven almost entirely by the federal side: the 2024 brackets are progressive, so a raise changes your federal tax faster than your Illinois tax. On the state's average pay of about $77,300 a year (BLS QCEW, 2024) federal income tax and FICA make up close to four-fifths of everything withheld.
Illinois income tax brackets
| Taxable income | Rate |
|---|---|
| All taxable income | 4.95% (flat) |
Approximate single-filer brackets; thresholds are indexed each year. The calculator above applies an effective rate rather than bracket-by-bracket state math.
Estimate only. Actual withholding depends on allowances, pre-tax deductions, local taxes and other factors. This tool is for educational use, not tax advice.
Want to see how much tax you'll pay instead? Income tax calculator by state.
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