The Illinois Department of Revenue (IDOR), in consultation with the Department of Commerce and Economic Opportunity, is conducting a study to evaluate the property tax system in …

Dec 2, 2025 · Learn more about Illinois state income tax structure, rates, and filing processes to help you better manage your taxes.

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.

The Illinois income tax rate is a flat 4.95%. Unlike the federal government and many other states, Illinois does not have tax brackets that impose higher rates on people who earn more.

Dec 20, 2024 · AARP’s state tax guide on Illinois tax rates for income, retirement and more for retirees and residents over 50.

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.

The official website of the State of Illinois Comptroller's office. Search state of Illinois revenues, expenditures, cash balances, vendor payment inquiries, an

Explore Illinois's 2025 state tax rates for income, sales, property, retirement, and more. Learn how Illinois compares nationwide.

Discover Illinois tax rates, income brackets, credits, and filing requirements. Learn about state deductions and tax obligations for residents and nonresidents.

Illinois has a 9.5 percent corporate income tax rate. Illinois also has a 6.25 percent state sales tax rate and an average combined state and local sales tax rate of 8.92 percent. Illinois has a 1.83 …