Max $23,500/year
Per paycheck
Illinois Income Tax Overview 2026
Illinois uses a flat income tax rate of 4.95% applied to all taxable income regardless of earnings level. Unlike progressive states, everyone pays the same percentage β whether you earn $30,000 or $300,000.
π‘ Chicago residents pay an additional city tax. Illinois also has a relatively high property tax rate, which affects overall cost of living.
How Illinois State Tax Affects Your Paycheck
When you receive a paycheck in Illinois, your employer withholds Illinois state income tax (4.95%) in addition to federal income tax, Social Security (6.2%), and Medicare (1.45%). Use our free paycheck calculator above to see the exact dollar amount withheld from your specific salary.
The Illinois state tax withholding applies to wages, salaries, and other compensation paid to Illinois residents or earned within Illinois. Your employer uses your W-4 and state withholding form to determine how much to withhold each pay period.
2026 Federal Tax Brackets (applies to all Illinois workers)
In addition to Illinois state tax, all workers pay federal income tax. The 2026 federal brackets range from 10% on income up to $11,925 (single filers) to 37% on income over $626,350. Most Illinois workers earning $40,000β$100,000 fall in the 12% or 22% bracket. Our Illinois paycheck calculator applies all these brackets automatically.
Frequently Asked Questions β Illinois Paycheck Calculator
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