Illinois Paycheck Calculator

Illinois has a flat rate of 4.95% on net income after exemptions.

They are progressive: e.g., single filers pay 10% on the first $11,925, 12% on the next up to $48,475, and so on up to 37%.

The base is $176,100; earnings above aren’t subject to the 6.2% tax.

Illinois uses a flat income tax system, meaning all taxpayers pay the same percentage of their taxable income, regardless of how much they earn. This differs from a progressive system where the rate increases with income.

To change your Illinois withholding, you need to fill out a new IL-W-4 form and submit it to your employer’s payroll or HR department. You can adjust the number of allowances you claim.

Contributions to a traditional 401(k) are made with pre-tax dollars. This means they are deducted from your gross pay before Illinois state income tax and federal income tax are calculated, reducing your overall tax burden for the year.

No. While Chicago has a high sales tax, it does not have a local income tax. Therefore, this Illinois Paycheck Calculator is equally accurate for residents of Chicago, Rockford, Peoria, and anywhere else in the state.

The Illinois standard deduction is tied to the federal standard deduction. For the 2025 tax year, the exact figure will be set by inflation adjustments, but the calculator handles this internally by working with your taxable income after this deduction is factored into the federal withholding calculation.

Our tool is highly accurate and updated with the latest 2025 federal and state tax rates. It provides a reliable estimate for salaried and hourly W-2 employees. For individuals with complex income streams (e.g., self-employment, significant investment income), we recommend consulting a tax professional.