Illinois Income Tax Calculator

Overview of Illinois Taxes

Illinois enforces a flat income tax rate of 4.95%. Starting 2023, a singular rate of 5% applies to income exceeding $10,000, replacing the prior 4% rate on income between $5,000 and $10,000, with plans to reduce this rate progressively in subsequent years.

To use the Illinois income tax calculator, simply input your desired salary and filing status to begin.

USA income tax calculator for Illinois

2023/24 Illinois Income Tax Calculator

Illinois Income Tax Calculator 2023
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The TaxAssist+ calculator computes your federal and state income taxes for the 2023/24 tax year, using several key factors such as your household income, geographical location, and filing status.


  • Initially, the calculator identifies your adjusted gross income (AGI) by reducing your total household income by specific, allowable adjustments.
  • We then subtract potential personal exemptions to arrive at your taxable income.
  • Your taxable income is subjected to relevant tax brackets based on your filing status to determine the total income tax you owe for the year.

Update Schedule: TaxAssist+ continuously monitors for amendments to tax rates and regulations, ensuring that our calculators remains current for the current tax year.

Customer Support: For any comments or inquiries, we encourage you to reach out directly to our support team via our contact page.

Step 1

Our US research professionals meticulously compile and scrutinize the latest tax laws and regulations to ensure foundational accuracy.
James Toth
Financial Services Research Expert

Step 2

A dedicated team of independent fact-checkers rigorously reviews and authenticates the compiled data for integrity and compliance.
By independent fact-checkers

Step 3

Our tech team then integrates these verified updates into the TaxAssist+ calculators, ensuring they reflect the most current tax rates.
Liam Hollis
Product & IT Lead at TNGB Research

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