Illinois Paycheck Calculator

Paycheck taxes in Illinois

Illinois has a flat 4.95% income tax, so every dollar of wages is taxed at the same rate no matter what you earn. A per-person exemption of $2,925 for 2026 — up $75 from 2025 — reduces the taxable amount, though it phases out at high incomes. The exemption is the only individual income tax figure that changed this year; Illinois still has no standard deduction.

Bonuses and supplemental wages in Illinois

Bonuses and other supplemental wages are frequently withheld differently from regular pay, and states set their own rules. This calculator applies Illinois's regular withholding to every dollar and does not model a separate supplemental rate, so a bonus paycheck can come out higher or lower than the figure above. Federal supplemental withholding is a flat 22% up to $1 million; for Illinois's own treatment, check the state authority linked below.

For the federal half, which this site does model, compare what withholding takes from a bonus against what you actually owe — the 22% flat rate is withholding, not a tax bill, and the difference comes back at filing.

Illinois vs. its neighbors

On a $100,000 salary you keep $74,375 in Illinois — $1,885 less than in neighboring Indiana, $1,042 less than in Missouri, and $886 less than in Wisconsin.

Federal income tax and FICA are identical in every state, so the whole gap above is state income tax. Single filer, $100,000 of wages, no 401(k) or other pre-tax deductions, 2025 state tables. Local income taxes (city and county) are not included. Run your own salary through the calculator above, or on any state's page.

Neighbours are only part of the picture. The study behind these figures ranks what a $100,000 salary takes home in all 50 states, with Illinois's row in place — the entire spread between best and worst is state income tax, since federal tax and FICA are identical everywhere.

A worked example at Illinois's median income

Illinois's median household income is $84,210 (2024, U.S. Census Bureau via FRED (real median household income)). Run through the same engine as the calculator above (single filer, taxes only):

That is an effective all-in tax rate of 23.9% at the median — your own number depends on filing status, 401(k), and benefits. Enter your salary above for the exact figure.

Common questions