Illinois Income Tax Calculator

Estimate your Illinois income tax burden

Updated for 2024 tax year on Dec 19, 2024

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How to calculate your Illinois income taxes

Understanding your Illinois income taxes

Illinois uses a flat tax system for income, meaning all taxpayers are taxed at the same 4.95% rate, regardless of income level.

There’s no specific payroll tax in Illinois, but employers are obligated to contribute to the state’s unemployment insurance fund.

Illinois does not provide a standard deduction or personal exemption. However, it does offer several tax credits and exemptions based on specific circumstances, such as the Earned Income Credit and property tax credits.

Calculate your income tax in Illinois

1. Work out your total federal income tax
   1. Gross income adjusted
      Gross income − Pre-tax deductions = Gross income adjusted
   2. Federal taxable income
      Gross income adjusted − Federal standard/itemized deductions = Federal taxable income
   3. Federal income tax liability
      Federal taxable income × Federal income tax rate = Federal income tax liability
   4. Federal payroll tax liability
      Gross income × Federal payroll tax rate = Federal payroll tax liability
2. Calculate your total Illinois state income tax
   1. Illinois state taxable income
      Gross income adjusted − (Illinois state itemized deductions + Illinois state exemptions) = Illinois state taxable income
   2. Illinois state income tax liability
      Illinois state taxable income × Illinois state income tax rate = Illinois state income tax liability
3. Add up all the taxes
   Federal income tax liability + Federal payroll tax liability + Illinois state income tax liability = Your total income tax liability

State income tax brackets

State exemptions

There are state-level exemptions for all type of filers and dependents. Refer to Tax Foundation for more details.

FAQs