How Illinois paycheck taxes work
- Illinois income tax: a flat 4.95% rate for 2026.
- Before tax, Illinois subtracts a personal exemption of $2,925 ($5,850 for a married couple).
- Illinois has no standard deduction. Instead each person gets a $2,925 exemption in 2026, which disappears above $250,000 of income ($500,000 married).
- Illinois taxes everyone at 4.95%. There are no local wage taxes in Illinois.
Illinois income tax rates for 2026
Illinois has a flat 4.95% rate on taxable income for every filing status.
How your take-home pay is calculated
Take-home = Gross pay − 401(k) − health − HSA − federal income tax − Social Security − Medicare − Illinois income tax − local tax
Federal income tax uses the 2026 brackets and standard deduction. Social Security is 6.2% of pay up to $184,500 a year; Medicare is 1.45% of all pay plus 0.9% above $200,000. Pre-tax health and HSA payroll deductions lower all of these; 401(k) lowers income tax only.
Illinois take-home pay examples
Single filer, paid every two weeks, no 401(k) or other pre-tax deductions, no local tax:
| Salary | Federal tax | Social Security + Medicare | State income tax | Take-home a year | Per biweekly check |
|---|---|---|---|---|---|
| $50,000 | $3,820.00 | $3,825.00 | $2,330.21 | $40,024.79 | $1,539.41 |
| $75,000 | $7,670.00 | $5,737.50 | $3,567.71 | $58,024.79 | $2,231.72 |
| $100,000 | $13,170.00 | $7,650.00 | $4,805.21 | $74,374.79 | $2,860.57 |
Worked example, $75,000 salary:
- Federal: $75,000 − $16,100 standard deduction = $58,900 taxable. Tax = $1,240 + $4,560 + 22% × $8,500 = $7,670.00.
- Social Security 6.2% = $4,650.00. Medicare 1.45% = $1,087.50.
- Illinois taxable income $72,075.00, Illinois income tax $3,567.71.
- Take-home: $58,024.79 a year, or $2,231.72 every two weeks. That's 22.6% of pay in taxes.
What this calculator simplifies
- Tax is worked out for the whole year and spread evenly over your paychecks. Employers use withholding tables, so a real check can differ by a few dollars; you settle the difference when you file.
- Federal tax uses the 2026 standard deduction only. Dependents, itemized deductions and the new tips, overtime and senior deductions aren't included (W-4 Step 3 credits can be entered under More options).
- State tax covers a typical W-2 employee who lives and works in the state. State credits for dependents, renters, earned income and similar aren't included.
Compare states on the paycheck calculator by state, or see federal tax bracket by bracket in the income tax calculator.
Sources
- Illinois Comptroller: 2026 state income tax exemption ($2,925)
- Tax Foundation: State Individual Income Tax Rates and Brackets, 2026
- IRS IR-2025-103: 2026 tax inflation adjustments
- SSA contribution and benefit base ($184,500 for 2026)
- IRS Topic 560, Additional Medicare Tax
State figures: 2026. Last reviewed October 2026.