What is the income tax rate in Illinois?

The top income tax rate in Illinois is 4.95%.

How is state income tax calculated in Illinois?

Illinois uses a flat tax rate of 4.95%. Multiply your taxable income by 4.95%.

Yes, Illinois offers a standard deduction of $2,775 for single filers and $5,550 for married couples.

Calculate your Illinois state income tax instantly. Updated for 2026 tax rates and brackets.

Enter your details to estimate your state income tax for 2026.

Step 1: Filing Status

Step 2: Annual Income

Enter your gross annual income before deductions.

Step 3: DeductionsApply Standard Deduction ($2,775)

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