Does Illinois Take State Tax Out of Your Paycheck?
Yes. Illinois charges a flat 4.95% state income tax, and that single number applies to every taxable dollar you earn. It doesn't matter if you make $30,000 or $300,000 a year. The rate stays the same, unlike states such as California or New York, where higher earners move into steeper tax brackets the more they make.
That flat structure makes Illinois paychecks genuinely easier to estimate than paychecks in bracket-based states. There's no need to figure out which slice of your income falls into which bracket. USACalculator built this Illinois version so the math reflects that flat rate directly, instead of running your numbers through a bracket table that was never built for Illinois in the first place.
The figures behind this tool come from the Illinois Department of Revenue, IRS Publication 15-T, and the U.S. Department of Labor, checked against 2026 figures. It's built for planning, not filing. For an exact number on your return, check with a licensed tax preparer or your payroll department.
Using the Calculator
Illinois is already selected below, so you can jump straight to your own numbers. Enter your gross pay, pick how often you're paid, and choose your filing status. The result updates as you type, showing your net pay for that period next to your total deductions for the year. If your employer's stub doesn't match what you see here, run the same numbers through our Illinois Pay Stub Generator to spot where the gap comes from.
How the Math Works
Gross pay comes in first. Federal income tax comes out next, based on your filing status and the current IRS brackets. FICA takes 7.65% combined for Social Security and Medicare. Then Illinois applies its flat 4.95% rate to your taxable income, and whatever remains is your net pay.
The inputs are your gross salary, pay frequency, and filing status. The outputs are your net pay per period and your total deductions for the year. Because Illinois uses one flat rate instead of brackets, the state tax portion of this estimate tracks closely with real payroll software, though your actual check can shift slightly depending on pre-tax benefits your employer runs.
What Makes an Illinois Paycheck Different
State Income Tax: A Flat 4.95%
Illinois taxes every dollar of taxable income at the same 4.95% rate. There's no ladder of brackets to climb as your income rises. A raise doesn't push part of your paycheck into a higher rate the way it would in a progressive-tax state, which makes budgeting for a bigger paycheck simpler to plan around.
Minimum Wage and Local Rules
Illinois reached a statewide minimum wage of $15 an hour after a multi-year phased increase. Chicago has historically set its own local minimum wage somewhat higher than the state floor, so pay minimums can differ depending on exactly where in Illinois you work.
Overtime Rules
Illinois follows the federal Fair Labor Standards Act baseline. Eligible workers earn 1.5 times their regular rate for hours worked beyond 40 in a week. There's no separate daily-overtime rule here, unlike California's rule that can trigger overtime after eight hours in a single day.
Pay Stub Requirements
Illinois employers must give workers an itemized statement of earnings and deductions each pay period under the Illinois Wage Payment and Collection Act. That's a real legal requirement in Illinois, not just a common courtesy. If you want to see what a compliant stub should look like, our Illinois Pay Stub Generator builds one from the same numbers you enter here.
A Real Example: $60,000 a Year in Illinois
Take a single filer earning $60,000, paid biweekly. Subtract the 2026 standard deduction of $15,000 and taxable income drops to $45,000. Running that through the federal brackets puts the annual federal tax bill at roughly $5,160. Illinois's flat 4.95% state tax, estimated on the full $60,000 gross for simplicity, comes to roughly $2,970. Your actual state liability will differ slightly once your real deductions and exemptions are applied, so treat this as a planning estimate rather than an exact figure.
| Item | Annual Amount |
| Gross Pay | $60,000.00 |
| Federal Income Tax | ~$5,160.00 |
| Social Security (6.2%) | $3,720.00 |
| Medicare (1.45%) | $870.00 |
| Illinois State Tax (4.95%) | ~$2,970.00 |
| Net Annual Pay | ~$47,280.00 |
Spread across 26 paychecks, that's roughly $1,818 landing in the bank each time, against a gross of $2,307.69. The effective tax rate lands close to 21%, a bit higher than a no-income-tax state, but the flat rate at least makes the state's share predictable no matter how a raise or bonus shifts your income.
Who Actually Uses This Calculator
People weighing an Illinois job offer against one in a different state use it to see the real gap in take-home dollars, not just the number on the offer letter. Contractors and freelancers use it to set aside the right amount for quarterly tax payments. New residents lean on it to build a budget around actual net pay instead of guessing. Once you know your net pay, it's a natural next step to see how a home purchase fits your budget with our Illinois Mortgage Calculator, or how much car payment you can handle with the Illinois Car Loan Calculator.
Mistakes People Make With Their Illinois Paycheck
- Assuming a flat tax rate means a low overall tax bill. Federal tax and FICA still take a real chunk out of every check.
- Comparing job offers by gross salary instead of net pay, which hides how the flat 4.95% rate actually affects your take-home amount.
- Forgetting that pre-tax benefits, like a 401(k), lower taxable income before both federal and Illinois tax are calculated.
- Overlooking that Chicago's local minimum wage can run higher than the statewide $15 floor.
- Assuming Illinois pay stubs are optional. State law actually requires an itemized statement each pay period.
- Carrying high-interest credit card debt on the assumption a steady paycheck will absorb it. Run the real payoff timeline first with our Illinois Credit Card Payoff Calculator.
Frequently Asked Questions
Does Illinois have a state income tax?
Yes. Illinois charges a flat 4.95% state income tax, applied the same way to every dollar of taxable income no matter how much you earn.
Is the Illinois income tax flat or based on brackets?
It's flat. Unlike California or New York, which use progressive brackets, Illinois taxes all income at one 4.95% rate.
How much are paycheck deductions in Illinois?
Most workers lose roughly 20% to 30% of gross pay to federal tax, FICA, and the flat state tax combined, depending on income and filing status.
What is the Illinois minimum wage in 2026?
The statewide minimum reached $15 an hour after a phased increase. Chicago has historically set its own local minimum somewhat higher.
Does Illinois have different overtime rules?
No. Illinois follows the federal Fair Labor Standards Act, paying 1.5 times the regular rate after 40 hours in a week, with no separate daily rule.
Are employers required to give pay stubs in Illinois?
Yes. The Illinois Wage Payment and Collection Act requires an itemized statement of earnings and deductions each pay period.
Why is an Illinois flat tax easier to estimate than a bracket state?
Because one rate applies to all your taxable income, so the math skips the multiple bracket steps a progressive-tax state requires.
Do Illinois residents still pay federal income tax?
Yes. Federal income tax and FICA apply to every worker in the country regardless of which state they call home.
Can a city in Illinois add its own income tax?
No. Illinois doesn't allow cities to layer a separate local income tax on wages, so the state's flat rate applies statewide.
Should I still contribute to a 401(k) in Illinois?
Yes. It lowers your federal taxable income and generally lowers your Illinois taxable income too, since the state largely starts from the federal number.
Related Illinois and Paycheck Tools
This page is part of a growing set of state-specific tools on USACalculator. Pair it with the Illinois Pay Stub Generator for a matching stub, the Illinois Sales Tax Calculator to see the other side of the state's tax picture, or the general Paycheck Calculator if you're comparing Illinois against a different state.
Sources: Illinois Department of Revenue, Illinois Department of Labor, IRS Publication 15-T, U.S. Department of Labor. Figures reviewed against 2026 federal tax tables. This calculator gives an estimate for planning purposes and is not tax advice — for your exact liability, check with a licensed tax preparer.