Tax & Payroll Calculators

Illinois Tax Calculator

Calculate Illinois flat state income tax liabilities. Accounts for Illinois flat tax rate, basic personal exemption, and dependents.

Reviewed by David Miller, CPA (CPA, M.S. Finance (NYU Stern))

Verified for accuracy•Updated 2026

Interactive Calculator

1. Provide Details

Gross Annual Income ($)

Filing Status

Number of Dependents

2. Output Results

IL Taxable Income57225.00 $

Total Exemptions Value2775.00 $

Illinois State Tax Due2832.64 $

Income After IL Tax57167.36 $

How to Calculate: Formula & Steps

Illinois levies a flat state income tax of 4.95% on taxable income after applying the state's basic personal exemption.

Formula Used:IL Tax = Taxable Income * 4.95%

Step-by-Step Calculation Example

Single filer with $50,000 gross income and 1 basic exemption ($2,775 for 2024) pays 4.95% of $47,225 = $2,337.64.

Common Mistakes to Avoid

Failing to claim the standard personal exemption or additional exemptions for being over age 65 or blind.

Practical Use Cases

Relocation planning to Illinois
Annual budget estimating

Expert Tips

Illinois offers a Property Tax Credit where you can deduct 5% of property taxes paid on your primary residence.

Disclaimer

This calculation tool is provided for educational and informational estimation purposes only. Results are based on mathematical formulas and user-supplied parameters. They do not constitute formal underwriting, financial, tax, engineering, or legal determinations.