How to use this tool
Check the units, enter your values, and run the tool. Results follow the assumptions and method below.
Calculation method
Illinois income tax before credits
net*0.0495Illinois Tax Calculator
Illinois individual income tax for 2026 at 4.95%. Enter Illinois net taxable income after state additions, subtractions and exemptions, not federal AGI. Does not determine residency, allocation, other-state credits or other tax credits. Outputs are unrounded arithmetic values; return-specific and payroll rounding procedures are separate.
Illinois individual income tax for 2026 at 4.95%. Enter Illinois net taxable income after state additions, subtractions and exemptions, not federal AGI. Does not determine residency, allocation, other-state credits or other tax credits. Outputs are unrounded arithmetic values; return-specific and payroll rounding procedures are separate.
Result
Enter your values and run the tool to see your result.