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Illinois Income Tax Calculator 2026 — Flat 5% Rate
Estimated Illinois state income tax at common income levels, combined federal + state burden, and the full Illinois tax bracket table — 2025 rates.
Reviewed for accuracy June 2026 by Gary Sing
State tax type
Flat 5%
State tax at $75k
$3,713
Federal tax at $75k
$8,114
Combined eff. rate $75k
15.8%
Calculate for another state:
Illinois income tax at common income levels — 2025
Single filer, 2025 federal standard deduction ($15,000). Federal tax uses 2025 IRS brackets.
| Income | Illinois state tax | State eff. rate | Federal tax | Total tax | Total eff. rate |
|---|---|---|---|---|---|
| $50,000 | $2,475 | 5.0% | $3,962 | $6,437 | 12.9% |
| $75,000 | $3,713 | 5.0% | $8,114 | $11,827 | 15.8% |
| $100,000 | $4,950 | 5.0% | $13,614 | $18,564 | 18.6% |
Single filer. Federal tax computed on gross income minus $15,000 standard deduction using 2025 IRS brackets. State tax estimates are approximate — consult a tax professional for exact liability. Does not include FICA (Social Security + Medicare), local taxes, or deductions beyond the standard deduction.
Illinois state income tax rate 2025
Flat rate: 5% on all taxable income
Illinois has a flat 4.95% income tax rate on all income — no brackets, no progressive structure. Illinois' state constitution prohibits a graduated income tax, though ballot measures to amend this have been proposed.
| Income | State tax rate | Note |
|---|---|---|
| All taxable income | 5% | Applied to federal AGI |
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Illinois income tax — frequently asked questions
Does Illinois have a state income tax?
Yes. Illinois has a flat 5% income tax rate that applies to all taxable income.
What is the Illinois state income tax rate for 2025?
Illinois has a flat 5% state income tax rate for 2025. This rate applies to all taxable income.
How much Illinois state income tax do I owe on $75,000?
On a $75,000 gross income (single filer, 2025), estimated Illinois state income tax is approximately $3,713 (effective rate: 5.0%). Combined with federal income tax of approximately $8,114, total tax is about $11,827 — an overall effective rate of 15.8%.
What is the combined federal and Illinois state income tax at $100,000?
At $100,000 gross income (single filer, 2025 standard deductions): federal income tax is approximately $13,614, Illinois state income tax is $4,950, for a combined total of approximately $18,564 — an overall effective rate of 18.6%.
How does Illinois's income tax compare to other states?
Illinois's top rate of 5% places it among the lower-tax states nationally. The nine states with no income tax pay $0 in state income tax; the highest-tax states (California at 13.3%, Hawaii at 11%) have the largest state income tax burdens.