Illinois Income Tax Calculator
Estimate your 2026 Illinois state income tax in seconds. Enter your annual income and filing status — this free Illinois income tax calculator applies the verified 2026 Illinois brackets, standard deduction, exemptions and credits. Runs entirely in your browser.
In 2026, Illinois taxes income at a flat 4.95% rate. Illinois offers a $2,925 personal exemption per filer. Illinois gives a $2,925 personal exemption per filer instead of a standard deduction.
Illinois 2026 Income Tax Brackets
| Taxable income (Single) | Rate |
|---|---|
| All taxable income | 4.95% |
Marginal rates: only income inside each band is taxed at that band's rate.
Frequently Asked Questions
What is the Illinois income tax rate for 2026?
Illinois taxes income at a flat 4.95% rate.
What deductions and exemptions does Illinois offer?
Illinois offers a $2,925 personal exemption per filer.
How accurate is this Illinois income tax estimate?
It is an annualized estimate: your income minus the 2026 standard deduction (and any state exemptions/credits shown), run through 2026 marginal brackets. It does not include pre-tax deductions like 401(k) contributions, itemized deductions, phaseouts, or local income taxes. Your actual liability can differ.
Sources
Tax figures verified September 2026 for tax year 2026.
Estimate only — not tax advice. This calculator annualizes your income, subtracts the 2026 standard deduction (and state personal exemptions/credits where shown), and applies 2026 marginal brackets. It does not model pre-tax deductions (401(k), health insurance), itemized deductions, credits you may qualify for, phaseouts, or local/city/county income taxes. Consult a tax professional for your situation.