In Illinois, the taxes deducted from a paycheck typically include:
- A flat state income tax rate of 4.95% on taxable income.
- Federal income tax withheld based on your W-4 form and income level.
- FICA taxes: 6.2% Social Security tax and 1.45% Medicare tax, totaling 7.65%.
- No additional local income tax in Illinois cities.
- Possible additional deductions like health insurance, retirement contributions, or other voluntary benefits if applicable.
For example, if the gross paycheck is $3,327, around 16.56% ($551) might be deducted in total taxes with 4.78% ($159) for Illinois state tax and 7.65% ($254) for FICA taxes, plus federal tax withholding based on your earnings and filing status. Illinois also has a state income tax exemption amount that adjusts with your pay frequency (e.g., about $118.75 per semi-monthly paycheck in 2025) which reduces taxable income. Overall, expect roughly 12% to 20% or more to be deducted depending on your income level and deductions, with the Illinois state tax fixed at 4.95% of taxable income plus federal and FICA taxes.
