Illinois Income Tax Calculator 2026
How much Illinois state income tax do I pay in 2026?
On a $75,000 salary, a single filer in Illinois pays $3,568 of state income tax for 2026 (4.76% of gross pay), after the $0 standard deduction. Enter any salary above for your own figure; for comparison, a joint filer on $100,000 pays $4,660.
Illinois taxes income in 2026 with a flat 4.95% state income tax. This calculator applies Illinois's own standard deduction of $0 single and $0 joint, then walks the state's 2026 schedule bracket by bracket.
Updated October 29, 2026
Your income details
Simple 2026 model: standard deduction and personal exemption only. No credits, no local taxes.
Your tax, bracket by bracket
The table updates with the calculator above and shows exactly which slices of taxable income are taxed at which rate in Illinois. On the default $75,000 salary, the top slice reached accounts for $3,568 of the $3,568 bill, about 100 percent; the rest is charged at the lower rates underneath it.
| Bracket range | Income in bracket | Rate | Tax |
|---|---|---|---|
| Enter your income and click Calculate. | |||
Illinois income tax on common salaries (single filer)
| Gross salary | Illinois income tax | Effective rate | Marginal rate |
|---|---|---|---|
| $40,000 | $1,835 | 4.59% | 4.95% |
| $50,000 | $2,330 | 4.66% | 4.95% |
| $75,000 | $3,568 | 4.76% | 4.95% |
| $100,000 | $4,805 | 4.81% | 4.95% |
| $150,000 | $7,280 | 4.85% | 4.95% |
A married couple filing jointly on $100,000 pays $4,660 of Illinois income tax in this model, thanks to the wider joint schedule and the $0 joint standard deduction.
How Illinois stacks up against other states
For scale, the $3,568 due on $75,000 puts Illinois 6th highest among the 42 taxing jurisdictions for 2026. Because Illinois uses one rate, the gap between its marginal and effective rates comes only from the standard deduction, never from bracket creep.
Try the salary slider at $50,000 and $100,000 to feel the flat structure: each additional $1,000 of taxable income always adds the same $50. In graduated states that figure changes as you climb; in Illinois it never does.
Two ratios describe Illinois's schedule in practice. The standard deduction and exemption shelter 3.9% of a $75,000 salary before any rate applies, and the bill grows from $2,330 at $50,000 to $4,805 at $100,000, a multiple of 2.06 for a doubling of pay. Flat schedules sit near 2.0 on that measure once the deduction is passed, so at 2.06, Illinois sits near the flat end of the scale.
State tax is only one slice of the paycheck
This calculator isolates the Illinois layer. A real Illinois paycheck also loses federal income tax and 7.65 percent FICA before it lands, which is why the state figure here is smaller than the total tax most people picture. To see the full picture for this state, run the same salary through the Illinois take-home pay calculator; for the rate schedule itself, see the Illinois tax brackets for 2026. Comparing Illinois with other states? The state income tax calculator hub covers every taxing state, and the income tax estimator handles the federal side of the same salary.
Frequently asked questions
How is Illinois income tax calculated?
Start with gross income, subtract the standard deduction of $0 single or $0 joint and the personal exemption of $2,925 or $5,850, then apply the 2026 Illinois rate schedule to what remains.
How much Illinois income tax is owed on $75,000?
A single filer earning $75,000 pays $3,568 of Illinois income tax for 2026 in this model. The effective rate is 4.76% of gross pay, while the marginal rate on the next dollar is 4.95%.
What is the marginal rate in Illinois?
In Illinois, your marginal rate is the rate charged on your last dollar of taxable income. On a $75,000 salary for a single filer here it is 4.95%, and the total bill at that salary is $3,568; the marginal rate steps up as income crosses each of the state's bracket thresholds.
Does this include federal tax or local tax?
No. This calculator covers Illinois state income tax only. Federal income tax, FICA, and any city or county income tax are separate; the take-home pay calculator for Illinois combines all of them.