Illinois Paycheck Calculator
Estimate your take-home pay in Illinois, which charges a flat 4.95% state income tax on every dollar of wages, whether you're paid hourly or on salary.
This calculator provides estimates for informational purposes only. Actual paycheck amounts may vary based on your employer, benefits, local taxes, filing status, and tax elections.
Your estimate will appear here
Enter your pay details and click calculate to see your estimated take-home pay, tax breakdown, and annual income.
Quick Answer
This calculator estimates your Illinois take-home pay by subtracting federal income tax, a flat 4.95% state tax, Social Security (6.2%), and Medicare (1.45%) from your gross pay, along with any deductions you enter. Because Illinois uses a true flat rate rather than brackets, this estimate tracks closely with your actual withholding.
How It Works: Formula & Variables
Net Pay = Gross Pay − Federal Tax − State Tax (4.95% flat) − Social Security − Medicare − Other Deductions
- Gross Pay
- Your total earnings before any deductions, hourly rate times hours, or annual salary divided by pay periods.
- Federal Tax
- Calculated using progressive tax brackets based on your filing status and taxable income.
- State Tax
- A true flat 4.95% of taxable income, the same rate at every income level.
- Social Security
- 6.2% of gross pay, up to the annual wage base limit.
- Medicare
- 1.45% of gross pay, with no wage limit (plus 0.9% surtax above certain thresholds).
Worked Examples
Example 1: Hourly worker in Springfield
Sam works 40 hours a week at $21 an hour. Gross weekly pay is $840. After federal income tax (around $84), Illinois state tax (4.95%, or $41.58), Social Security (6.2%, or $52.08), and Medicare (1.45%, or $12.18), estimated take-home pay lands at about $650.16 a week, roughly 77% of gross pay.
Example 2: Salaried employee in Chicago
Priya earns $72,000 a year, paid biweekly ($2,769.23 gross per paycheck), filing as Single. After federal tax, Illinois's flat 4.95% state tax, Social Security, and Medicare, her estimated take-home pay comes out to roughly $2,080 per paycheck, about 75% of her gross pay.
Key Concepts
A genuine flat tax: Unlike California or New York's progressive brackets, Illinois taxes every dollar at 4.95% regardless of income, so this calculator's state tax figure is exact rather than an approximation.
No local income tax: Illinois cities, including Chicago, don't layer a municipal income tax on top of the state rate, which is a meaningful difference from Ohio or Pennsylvania.
The flat rate has survived reform attempts: Illinois voters rejected a 2020 ballot measure that would have replaced the flat tax with progressive brackets, so the 4.95% rate has remained stable for years.
Useful for comparing job offers: If you're weighing an Illinois offer against a no-tax state like Texas, run both through a paycheck calculator to see the real gap in take-home pay.
Common Mistakes
Assuming Illinois has progressive state brackets: It doesn't. The flat 4.95% rate applies the same way whether you earn $40,000 or $400,000.
Adding a local income tax that doesn't exist: Illinois residents don't pay a separate city or county income tax, unlike workers in many Ohio or Pennsylvania municipalities.
Comparing gross salaries across states: A $70,000 offer in Illinois and a $70,000 offer in Texas don't translate to the same take-home pay. Always compare net pay, not gross.
Ignoring pre-tax deductions: 401(k) contributions and health insurance premiums lower your taxable income before both federal and state tax apply, so leaving them out understates your real take-home pay.
Frequently Asked Questions
Illinois charges a flat 4.95% state income tax on wages, no matter your income level. This calculator applies that same 4.95% rate, so it lines up closely with Illinois's real withholding, unlike states with progressive brackets where a flat estimate is only approximate.
Flat. Illinois is one of a small group of states that taxes every dollar of income at the same 4.95% rate, regardless of whether you earn $30,000 or $300,000. There have been repeated proposals to move Illinois to a progressive system, including a 2020 ballot measure that voters rejected, so the flat rate has stayed in place.
Federal income tax, the flat 4.95% Illinois state tax, Social Security (6.2% up to the annual wage base), and Medicare (1.45%, plus 0.9% more for high earners).
No. Unlike Ohio or Pennsylvania, Illinois doesn't have widespread municipal or school district income taxes. Chicago and other Illinois cities fund services mainly through property tax and sales tax instead.
Yes, switch between the Hourly and Salary tabs and enter your wage or annual salary along with your pay frequency. The state is already set to Illinois.