Illinois Paycheck Calculator 2026 — Take-Home Pay After Tax

How paychecks work in Illinois

Every paycheck issued in Illinois has three federal withholdings — federal income tax, Social Security, and Medicare — followed by Illinois's own withholding rules and any local wage tax that applies where you work. Illinois has a flat 4.95% state income tax. Illinois's economy is driven by Chicago's role as a finance, futures-trading, manufacturing, and logistics center for the Midwest.

This page explains, step by step, how gross wages become take-home pay in Illinois: what the federal government takes, what the state of Illinois takes, which cities and localities add their own withholding, and how minimum wage, overtime, and pay-frequency rules interact with common benefits like 401(k) contributions and pre-tax health premiums.

Federal taxes on Illinois paychecks

Regardless of where you live, the IRS applies the same federal income tax brackets, standard deduction, and FICA contributions. For 2026, the federal tax brackets range from 10% on the first ~$12,400 of taxable income (single) up to 37% on income above roughly $626,000. Most workers land in the 12%, 22%, or 24% brackets after subtracting the $16,100 single (or $32,200 married-jointly) standard deduction.

On top of federal income tax, every Illinois employee pays FICA: 6.2% Social Security up to a $184,500 wage base, plus 1.45% Medicare on all wages, with an additional 0.9% Medicare surtax on wages over $200,000 (single). Employers match Social Security and Medicare dollar-for-dollar; you only see your half on the stub.

Illinois state income tax

Illinois taxes wage income at a flat 4.95%. Illinois also offers a personal exemption of $2,775 per taxpayer.

Because Illinois uses a flat rate, every dollar of taxable wage income is taxed at the same rate. This makes Illinois state withholding simpler to estimate than in states with graduated brackets.

Local wage taxes in Illinois

No local income taxes on wages; Chicago has various employer head taxes but no wage tax.

FICA: Social Security and Medicare

Social Security is the biggest single deduction most middle-income Illinois workers see besides federal income tax. It funds retirement, disability, and survivor benefits, and applies at 6.2% until you have earned $184,500 for the year (2026). If you earn more than that, Social Security stops for the remainder of the year — a highly visible bump in take-home pay for high earners late in the calendar year.

Medicare has no cap. All wages are hit at 1.45%, and an extra 0.9% Additional Medicare Tax applies to any wages above $200,000 (single) or $250,000 (married filing jointly). Employers begin withholding the additional 0.9% the pay period you cross $200,000, whether or not you'll actually owe it after year-end.

Overtime rules for Illinois employees

Follows federal FLSA: 1.5x for hours over 40/week.

Overtime pay itself is taxed exactly the same way as regular wages — there is no special overtime tax rate. But because a paycheck with lots of overtime looks temporarily much larger, employer withholding formulas may withhold a higher percentage than your true annual rate. That withholding is reconciled at tax time via your federal 1040 and Illinois state return, so if you consistently work overtime you may want to review your W-4 to avoid over-withholding.

Minimum wage in Illinois

The current minimum wage in Illinois is $15.00 per hour. Illinois's minimum wage reached $15 on January 1, 2026. At 40 hours per week and 52 weeks per year, that equates to roughly $31,200 in gross annual wages before overtime.

Pay frequency rules

At least semi-monthly for most workers; weekly for daily/hourly employees. Most private-sector employees in Illinois are paid either weekly or bi-weekly, with salaried professionals often on a semi-monthly schedule. Choosing the right pay-frequency assumption is important when using the calculator above, because the same annual salary produces different per-paycheck amounts depending on whether it's split over 26 (bi-weekly) or 24 (semi-monthly) periods.

Reciprocal states

Illinois has reciprocal income tax agreements with Iowa, Kentucky, Michigan, and Wisconsin. If you live in one of those states but work in Illinois (or vice versa), you generally only pay state income tax to your home state — you fill out a certificate of non-residence with your employer to stop withholding for the work state.

Example take-home pay in Illinois

The table below shows estimated federal, FICA, and Illinois state tax for a single filer at several common salary levels, using 2026 rules and the standard deduction. Bi-weekly amounts assume 26 paychecks per year.

Common Illinois payroll deductions to watch

• 401(k) contributions — pre-tax dollars reduce federal (and, in Illinois, state) income tax. The 2026 employee limit is $24,500 ($32,000 if age 50+).
• Pre-tax health premiums — Section 125 cafeteria plan contributions reduce federal, state, and FICA-taxable wages.
• HSA contributions — for high-deductible health plans, HSA money is pre-tax at both federal and state levels in Illinois.
• Garnishments, child support, and Roth 401(k) — these post-tax deductions do not reduce taxable wages but still cut take-home pay.
• Illinois's flat 4.95% income tax applies to all income levels equally.
• Illinois has a $2,775 personal exemption per taxpayer and dependent (2026).

Key industries and pay levels in Illinois

Illinois's top industries include Finance, Manufacturing, Logistics, Agriculture, and Healthcare. Major employers like Boeing, Caterpillar, Walgreens Boots Alliance, and Abbott Laboratories anchor a large share of state payrolls, and pay levels tend to track industry mix — states heavy on technology, finance, and aerospace typically show higher median household income than states dominated by agriculture, tourism, or retail.