Tax Calculator Illinois
Calculate combined federal + Illinois state income tax with deductions, filing status, and SALT itemization. Updated for 2026.
Illinois state tax applied. Illinois has a flat 4.95% state income tax. Personal exemption of $2,775 per dependent.
Deductions you can claim
Total tax owed
$14,292
Effective rate 16.81% · Marginal 22.0%
Taxable income
$70,000
Take-home
$70,708
Federal + Illinois combined
Federal: $10,222 · Illinois: $4,070
Full breakdown
Step-by-step from gross income to total tax owed.
| Gross income | $85,000 |
| Standard deduction | $15,000 |
| Taxable income | $70,000 |
| Federal income tax | $10,222 |
| Illinois state tax Flat 4.95% rate | $4,070 |
| Total tax | $14,292 |
| Take-home (post-tax only) | $70,708 |
Illinois state tax at a glance
Illinois has a flat 4.95% state income tax. Personal exemption of $2,775 per dependent.
Illinois flat tax rate
| Taxable income | Rate |
|---|---|
| $0 – above | 4.95% |
Standard deduction / personal exemption: $2,775
Compare with other states
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Frequently Asked Questions
What is Illinois's flat tax rate?▾
Illinois charges a flat 4.95% state income tax on all taxable income, regardless of income level. Illinois has a flat 4.95% state income tax. Personal exemption of $2,775 per dependent.
How does Illinois tax interact with federal tax?▾
Federal income tax is calculated on your full taxable income using IRS brackets and the federal standard deduction. Illinois tax is calculated separately using Illinois's own brackets and standard deduction. You can deduct up to $10,000 of state and local taxes (SALT) on your federal Schedule A — but only if you itemize.
Does this calculator include city/local taxes?▾
No local or city taxes are calculated. Most Illinois residents don't have local income tax to worry about, but check your specific city — some have payroll, occupation, or wage taxes.
How do I become a Illinois resident for tax purposes?▾
Generally you need to (1) be physically present in Illinois for more than half the year, (2) have your "domicile" (permanent home) in Illinois, and (3) file a state tax return as a Illinois resident if required. States like California and New York are notably aggressive about claiming residency — moving requires careful documentation: change driver's license, voter registration, primary residence, bank accounts, and minimize ties to your former state.
What if I work in one state but live in another?▾
You generally pay state tax to the state where you EARN the income. Many states have reciprocity agreements with neighbors so you only pay your home state. Others require you to file in both and credit the tax paid elsewhere. Remote workers should pay particular attention — some states (NY, CA) tax remote workers of in-state companies regardless of where they live.