The Illinois Department of Revenue will begin accepting 2025 Individual Income Tax Returns on Monday, January 26, the same day the IRS opens the federal filing season for individuals.

4 days ago · The Illinois income tax rate is a flat 4.95%. Unlike the federal government and many other states, Illinois has no tax brackets that increase rates with income.

Aug 7, 2025 · Learn about Illinois State taxes, including income tax, sales tax, and investment income tax. Get tips for managing your taxes and maximizing deductions.

Jan 14, 2026 · Learn more about Illinois state income tax structure, rates, and filing processes to help you better manage your taxes.

6 hours ago · The Illinois Department of Revenue has announced it will begin accepting 2026 individual income tax returns on Monday, January 26, the same day the Internal Revenue Service (IRS) opens …

2 days ago · The Illinois Department of Revenue announced that it will begin accepting 2026 individual income tax returns on Monday, Jan. 26.

Use our Illinois (IL) state tax calculator for 2026 to estimate income tax accurately. Updated with current Illinois tax rules.

Jul 14, 2025 · Illinois has enacted significant changes to its income, sales and use, and excise tax laws as part of the state's fiscal year 2026 budget bill (H.B. 2755), signed into law by Governor J.B. …

Illinois levies a flat income tax rate of 4.95 percent on individuals earning income in the state. The tax is a flat percentage of a taxpayer’s federal adjusted gross income.

Dec 20, 2024 · Illinois’ flat income tax rate means that every resident, regardless of income level, pays the same individual income tax rate of 4.95 percent. Nonresidents who work in Illinois also must pay …