Illinois Salary Calculator — Take-Home Pay by Role
Illinois pays roughly 4% above the national average, with most high-wage roles concentrated in the Chicago metro. The flat 4.95% income tax simplifies take-home math vs progressive-bracket states. Use the Illinois salary calculator below to estimate gross, federal, FICA, and IL state tax — and the take-home pay that lands in your bank account.
Median household income
$78,433
US Census ACS, 2024
Top state income tax
4.95%
Tax Foundation, 2025-2026
Cost-of-living index
95
100 = US average
$100k take-home (single)
$74,796
After federal + FICA + state
Salary Calculator — Take-Home by State
BLS-modelled percentiles + federal, FICA, and state tax math. Numbers update as you change inputs.
Add your current salary to see how it compares to the role's median in Illinois.
Estimated Mechanical Engineer salary in Illinois
Median: $104,000 · 90th percentile $164,300 · 10th percentile $68,600
Gross (median)
$104,000
Federal tax
-$14,721
FICA
-$7,956
IL state tax
-$3,861
Estimated take-home pay
$77,462/yr
About $6,455/month after federal + FICA + state. Effective tax rate 25.5%.
vs national median for this role
+$4,000 (4.0%)
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Illinois pays roughly 4% above the national average, with most high-wage roles concentrated in the Chicago metro. The flat 4.95% income tax simplifies take-home math vs progressive-bracket states. The state's economy leans heavily on Manufacturing, Financial Services, Healthcare, plus Logistics and Agriculture, and that mix drives the highest-paying occupations on the ground.
Top employers in Illinois
Five of the largest private-sector employers in Illinois, each of which anchors regional wage levels:
State tax math on a $100,000 salary
Take the median family-supporting US salary of $100,000 and run the IL numbers:
- Federal income tax (single, standard deduction): $13,841
- FICA (Social Security + Medicare, employee side): $7,650
- IL state income tax: $3,713 (4.95% top bracket scaled to effective rate)
- Take-home: $74,796 (effective rate 25.2%)
The same $100,000 gross in Texas (no state income tax) yields $78,509 take-home — a −$3,713 swing purely from state tax policy.
Cost-of-living adjustment vs national
Illinois sits at 95 on the cost-of-living index (100 = US average). That means $1 of take-home in Illinois buys roughly 105¢ of the equivalent national consumption basket. Compare nominal and real wages before deciding whether a higher offer in another state is actually a raise.
Featured role: Mechanical Engineer in Illinois
Mechanical Engineer is a strong fit for Illinois's top industries (Manufacturing and Financial Services). Here's the BLS-modelled band for 5 years of experience.
10th pct
$68,600
25th pct
$83,200
Median
$104,000
75th pct
$130,000
90th pct
$164,300
Median take-home for this role in Illinois: roughly $77,462/yr after federal + FICA + state tax.
Compare to other states
Methodology and data sources
Wage percentiles are modelled on the BLS Occupational Employment and Wage Statistics (OEWS) national release, adjusted by a state pay index derived from BLS state mean-wage ratios. State tax rules come from the Tax Foundation state-bracket tables. Cost-of-living is the C2ER-style composite index normalised to 100 = US average. Federal brackets come from IRS Revenue Procedure publications for 2025-2026. Median household income figures come from the US Census American Community Survey (ACS). Last updated May 18, 2026.
Frequently Asked Questions
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