In Illinois, about 12.6% of your paycheck is gone before federal income tax even enters the picture: 7.65% to Social Security and Medicare and 4.95% to the state’s flat income tax. Add federal withholding and most workers see total deductions of roughly 20% to 30% of gross pay, with the exact percentage taken out of your paycheck in Illinois depending on your income, filing status, and the elections on your W-4.
The Mandatory Floor Every Illinois Worker Pays
Two deductions hit every paycheck regardless of what you earn or how you file.
The first is FICA. Your employer withholds 6.2% for Social Security and 1.45% for Medicare, a combined 7.65% of gross wages. Your employer pays a matching 7.65% that never shows up on your stub.1Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates The Social Security portion only applies to wages up to an annual cap ($184,500 in 2026), so very high earners see that 6.2% stop late in the year.2Social Security Administration. Contribution and Benefit Base Medicare has no ceiling, and once your wages pass $200,000 your employer withholds an additional 0.9% Medicare surtax on everything above that line.3Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
The second is Illinois state income tax. Illinois taxes income at a single flat rate of 4.95%, no brackets, no graduation.4Illinois Department of Revenue. Income Tax Rates The state has no standard deduction, but it allows a personal exemption of $2,925 per person for 2026, plus the same amount for each dependent.5Illinois Department of Revenue. FY 2026-15, What’s New for Illinois Income Taxes On a $60,000 salary with no dependents, that works out to tax on $57,075, or about $2,825 a year, roughly 4.71% of gross pay.
What Federal Withholding Adds On Top
Federal income tax is the biggest variable on your stub. Your employer calculates it each pay period using IRS tables, your gross wages, and your W-4 elections, with the goal of pre-paying your annual federal bill in roughly equal installments.6Internal Revenue Service. Tax Withholding for Individuals
Two features of the federal system matter most for understanding what hits your paycheck. First, the standard deduction shelters a baseline amount of income from any federal tax. For 2026, it’s $16,100 for single filers, $32,200 for married filing jointly, and $24,150 for heads of household.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A single person earning $60,000 is only taxed federally on $43,900.
Second, the rate schedule is progressive, so your top bracket is not the percentage you actually pay. For a single filer in 2026, the first $12,400 of taxable income is taxed at 10%, income from $12,401 to $50,400 at 12%, income from $50,401 to $105,700 at 22%, and higher slices at 24%, 32%, 35%, and 37%. Married-joint brackets cover roughly double the income range at each step.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Because the rate stair-steps upward, a $60,000 earner’s effective federal rate lands near 8.4%, not the 12% they might assume from their top bracket.
Your W-4 is the lever that controls how much the employer actually withholds. If you never submit one, the employer defaults to single with no adjustments, which produces the highest withholding.8Internal Revenue Service. Form W-4 (2026) Employee’s Withholding Certificate Marking a different filing status, claiming dependents, or requesting extra per-paycheck withholding on line 4(c) all change the number that leaves each paycheck.
What Illinois Does Not Take Out
If you’ve worked elsewhere, a few deductions you might be bracing for simply don’t exist here.
No city or county in Illinois can impose its own income tax on wages. In states like Ohio, Pennsylvania, or New York, local payroll taxes can add another 1% to 3%; in Illinois, the 4.95% state rate is the only state-level income deduction on your stub.
Illinois also does not fund disability insurance or paid family leave through an employee payroll tax. California, New Jersey, and New York workers see 0.5% to 1.5% withheld for those programs. Illinois has a paid leave law, but it isn’t paid for through a line on your paycheck. The only mandatory deductions on an Illinois pay stub are FICA, federal income tax, and the 4.95% state tax.
How Pre-Tax Benefits Shrink the Percentage
Voluntary pre-tax deductions reduce the income your taxes are calculated on, though not always every tax.
Traditional 401(k) contributions come out before federal and Illinois income tax is calculated, so they lower both. They do not reduce FICA, though, which is still assessed on your full gross wages.9Internal Revenue Service. Retirement Plan FAQs Regarding Contributions A $6,000 contribution on a $60,000 salary drops your income-taxable base to $54,000 but leaves the 7.65% FICA calculation sitting on the full $60,000.
Health insurance premiums paid through an employer’s Section 125 cafeteria plan get stronger treatment: they avoid federal income tax, Illinois income tax, and FICA.10Internal Revenue Service. FAQs for Government Entities Regarding Cafeteria Plans That’s why employer-sponsored coverage is far more tax-efficient than buying a policy on your own.
What the Total Looks Like at Different Salaries
For a single Illinois worker earning $60,000 in 2026 with no dependents, the standard deduction, and no pre-tax contributions, the annual breakdown looks like this:
- Social Security at 6.2%: $3,720
- Medicare at 1.45%: $870
- Illinois state tax (4.95% of $57,075): about $2,825
- Federal income tax (on $43,900 taxable income): about $5,020
- Total: roughly $12,435, or 20.7% of gross pay
Take-home pay in that example is about $47,565 before any voluntary deductions.
At $100,000, the combined percentage climbs to roughly 25% to 26% as more income falls into the 22% federal bracket. At $200,000, it reaches 30% or higher once the 24% and 32% brackets, plus the 0.9% Medicare surtax above $200,000, start pulling. These numbers shift with your W-4, your pre-tax elections, and whether you claim dependents, but they’re a realistic baseline for an Illinois pay stub.