Illinois uses a flat state income tax rate, which makes take-home pay easy to predict at any income.
How this calculator arrives at its answer
Illinois applies a single flat rate to taxable income rather than a bracket system, which makes take-home pay unusually easy to predict: the state share stays proportional whatever you earn. The Illinois constitution requires a flat rate, and a 2020 ballot measure to allow graduated rates was rejected by voters.
Illinois allows a personal exemption allowance that reduces taxable income slightly, and additional allowances for dependents, so the effective rate is a little below the headline flat rate for most workers.
No Illinois municipality levies an income tax on wages, so unlike Ohio there is no city line to add on top of the state figure.
How to use it
- Enter your pay amount and how often you are paid.
- Set your filing status, state and tax year.
- Add pre-tax deductions to see how they change the net figure.
The formula
A worked example
Worked through, a pay basis of Annual salary produces a take-home pay of $1,876.73. Underneath, Gross per period comes out at $2,500 and Federal income tax at $206.6. Change any field and every figure updates as you type.