What is different in Illinois:
- Flat 4.95% income tax on wages — the state constitution requires a single rate for everyone.
- No local income tax in Chicago or elsewhere in the state.
- The 4.95% applies to wages after pre-tax deductions like a 401(k).
- Federal income tax, Social Security and Medicare work exactly as in every other state.
What a Illinois paycheck looks like at six salaries
Single filer, paid every two weeks, no 401(k) or other deductions, 2026 figures. Every number below comes from the same tested formulas the calculator above uses.
| Salary | Federal income tax | Social Security + Medicare | Illinois tax | Take-home / year | Take-home / paycheck |
|---|---|---|---|---|---|
| $52,000 | $4,060 | $3,978 | $2,574 | $41,388 | $1,591.85 |
| $72,000 | $7,010 | $5,508 | $3,564 | $55,918 | $2,150.69 |
| $92,000 | $11,410 | $7,038 | $4,554 | $68,998 | $2,653.77 |
| $118,000 | $17,130 | $9,027 | $5,841 | $86,002 | $3,307.77 |
| $148,000 | $24,254 | $11,322 | $7,326 | $105,098 | $4,042.23 |
| $195,000 | $35,534 | $14,267 | $9,653 | $135,547 | $5,213.35 |
Worked example: $98,000, married, paid monthly
Married filing jointly, paid once a month, 6% of salary to a traditional 401(k) — $490.00 a month, $5,880 a year — in Illinois.
- Taxable income: $98,000 − $5,880 401(k) − $32,200 standard deduction (married filing jointly) = $59,920.00.
- Federal income tax on that amount: $6,694.40 a year.
- Social Security: $6,076.00; Medicare: $1,421.00. The 401(k) does not reduce these.
- Illinois state income tax: $4,559.94.
- Take-home: $98,000 − $5,880 − $6,694.40 − $6,076.00 − $1,421.00 − $4,559.94 = $73,368.66 a year, or $6,114.06 per monthly paycheck.
Worked example: $26 an hour in Illinois
A single worker earns $26.00 an hour for 40 hours a week: $26.00 × 40 × 52 = $54,080 a year before tax. After federal income tax ($4,310), Social Security ($3,353) and Medicare ($784) ($2,677 of Illinois tax), take-home is $42,956 a year — about $1,652.17 per biweekly paycheck.
Illinois vs Indiana: $92,000
The same single worker earning $92,000, paid biweekly with no 401(k). Illinois's 4.95% takes $4,554 a year; Indiana's 2.95% state rate takes $2,714 — before Indiana's county tax.
| Illinois | Indiana (2.95% flat) | |
|---|---|---|
| Federal income tax | $11,410 | $11,410 |
| Social Security + Medicare | $7,038 | $7,038 |
| State income tax | $4,554 | $2,714 |
| Take-home per year | $68,998 | $70,838 |
The Illinois worker keeps $1,840 less per year than the Indiana worker on the state rate alone — about $70.77 per paycheck. (Indiana counties add their own tax on top.) To compare every no-tax and flat-tax state side by side, see take-home pay by state. Also see our Indiana paycheck calculator.
What Illinois does not tax — and what it does
Illinois's 4.95% has been stable for years, and the state constitution locks in a single flat rate — voters rejected a graduated-tax amendment in 2020. What the paycheck doesn't show is Illinois's other big levies: property taxes among the nation's highest and a 6.25% state sales tax, both of which hit harder than the 4.95% line suggests.
What this page leaves out
Child and dependent credits, itemized deductions, health premiums, 401(k) contributions beyond the examples above, bonuses and overtime are not in the simplified calculator — the full paycheck calculator covers all of them, with Illinois at its 4.95% flat rate. For exact figures use your employer's payroll system or the IRS Tax Withholding Estimator.
Sources and review
Brackets and standard deductions come from IRS Revenue Procedure 2025-32. The Social Security wage base comes from the Social Security Administration, and Illinois’s 4.95% flat rate is confirmed by the Tax Foundation's 2026 state rates. Last reviewed September 2026. See our methodology for how every figure is checked.