Illinois uses a constitutionally required flat income tax rate that applies equally to all wage earners. This Illinois paycheck calculator combines federal income tax, Social Security, Medicare, and Illinois's 4.95% flat state income tax to show your real 2026 take-home pay.
How Illinois state income tax works
Illinois levies a flat 4.95% state income tax on personal income. The Illinois Constitution requires a single flat rate, so attempts to introduce graduated brackets have required (and so far failed at) constitutional amendments. Every taxpayer pays the same marginal rate.
Illinois offers a modest exemption rather than a true standard deduction — $2,925 per filer (and double for joint filers) is reflected as a deduction here. The calculator subtracts that from your wage base before applying the 4.95% rate. Cook County and Chicago residents pay no extra local income tax on wages.
Illinois paycheck FAQ
›Does Illinois have a state income tax?
Yes. Illinois levies a flat 4.95% income tax on personal income, required by the state constitution to be a single rate.
›What is the Illinois income tax rate?
A flat 4.95% on all taxable income. Illinois does not have graduated brackets.
›How much is take-home pay on $75,000 in Illinois?
A single filer earning $75,000 in Illinois with no pre-tax deductions takes home roughly $56,000 to $57,000 per year after federal, FICA, and the 4.95% state tax.
›Does Chicago have a city income tax?
No. Chicago does not levy a city income tax on wages, so Illinois residents in Chicago pay only the state's 4.95% on top of federal and FICA.
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