Illinois Paycheck Calculator — Estimate Your 2025 Take-Home Pay
Illinois has a flat 4.95% state income tax. Enter your salary or hourly wage below to see your net pay per paycheck.
Last updated: January 2026
Illinois Paycheck Calculator
How to calculate your Illinois take-home pay
Your take-home pay in Illinois is your gross income minus federal income tax, FICA taxes (Social Security and Medicare), and Illinois state income tax. This calculator uses the 2025 federal tax brackets, standard deduction, and Illinois's 5.0% tax rate to estimate your net pay per paycheck.
Illinois has a state income tax rate of 5.0%. Your paycheck is reduced by federal income tax, FICA, and state income tax. For the most accurate estimate, consult your payroll department or a tax professional.
Illinois income tax explained
Illinois has a flat 4.95% state income tax.
Illinois's state income tax rate of 5.0% applies to your taxable income. Depending on your income level and filing status, you may owe slightly more or less than this rate due to progressive tax brackets and deductions. Some cities and counties in Illinois may also impose local income taxes.
Federal taxes that apply in Illinois
All workers in Illinois pay the same federal taxes. Federal income tax uses seven progressive brackets (10%, 12%, 22%, 24%, 32%, 35%, and 37%) applied to your income after the standard deduction ($$14,600 for single filers, $29,200 for married couples filing jointly, and $21,900 for heads of household).
FICA taxes include Social Security (6.2% on wages up to $168,600 in 2025) and Medicare (1.45% on all wages). If you earn over $200,000 ($250,000 married filing jointly), you also pay an additional 0.9% Medicare surtax. Self-employed individuals pay both the employer and employee portions (15.3% total).
Factors that affect your Illinois paycheck
Several factors beyond income taxes affect your net pay: pre-tax deductions like 401(k) contributions, health insurance premiums, and flexible spending accounts (FSAs) reduce your taxable income. Post-tax deductions like Roth IRA contributions do not affect your current tax bill but reduce your take-home pay.
Your W-4 withholding allowances determine how much federal tax is withheld from each paycheck. If you consistently receive large refunds, you may want to adjust your W-4 to increase your per-paycheck take-home pay instead of waiting for a refund.
Illinois income tax — what you need to know
Illinois has a flat 4.95% state income tax.
- Illinois employers generally withhold state income tax from wages based on state withholding forms and payroll tables.
- Illinois taxpayers should compare paycheck withholding against their annual return because deductions and credits can change the effective rate.
- Illinois payroll calculations can differ when employees have pre-tax benefits, retirement contributions, supplemental wages, or multiple jobs.
Local taxes: Local income tax is not modeled in this calculator unless specifically noted by the state tax authority.
Official source: Illinois state tax authority
State filing deadline: Generally April 15, unless the state announces a different deadline
Standard deduction: Varies by filing status; verify with the state tax authority
Sources
- IRS Publication 15-T — Federal Income Tax Withholding Methods
- Social Security Administration — Contribution and Benefit Base
- State tax rates sourced from each state's department of revenue (2025)
Frequently asked questions about Illinois paycheck calculations
How is my paycheck calculated in Illinois?
Your gross pay is reduced by federal income tax (using progressive brackets), Social Security (6.2% up to $168,600), Medicare (1.45% on all wages), and state income tax at 5.0%. The result is your net or take-home pay.
Does Illinois have a state income tax?
Yes. Illinois has a flat 4.95% state income tax.
What is the Illinois state income tax rate for 2025?
The Illinois state income tax rate is 5.0% for 2025. Depending on your income, the effective rate may be lower due to progressive brackets.
How do federal taxes affect my Illinois paycheck?
Federal income tax uses progressive brackets (10%, 12%, 22%, 24%, 32%, 35%, 37%) applied to your taxable income after the standard deduction ($14,600 for single filers in 2025). Social Security tax is 6.2% on wages up to $168,600. Medicare tax is 1.45% on all wages.
How can I reduce my tax withholding in Illinois?
Adjust your W-4 form with your employer to claim additional allowances or deductions. Contributing to a 401(k), HSA, or traditional IRA reduces your taxable income. If you are over-withholding for Illinois state tax, you can adjust your state withholding allowances.