Are your taxes delinquent? The Cook County Treasurer's Office website was designed to meet the Illinois Information Technology Accessibility Act and the Americans with Disabilities Act.

Catch up on all the key tax changes and updates coming in 2026—at your convenience. Webinar recordings are now available, so you can stay informed and ahead of the curve.

Find IRS forms and answers to tax questions. We help you understand and meet your federal tax responsibilities.

Learn about filing federal income tax. Check the status of your tax refund, find help filing your taxes, and get federal tax forms.

Jan 2, 2026 · Here's what you should know about income tax, what it is, how it works, how to calculate it and which states don't have it.

See the 2025-2026 individual tax rates & tax brackets to determine which tax bracket you're in this year. Learn about other tax rates and get help from H&R Block.

Get Free Tax Prep Help The IRS Volunteer Income Tax Assistance (VITA) and the Tax Counseling for the Elderly (TCE) programs offer free tax help for taxpayers who qualify. Find a …

The Department collects Cook County home rule taxes and other fees, and administers and enforces such collections. The Department audits and maintains delinquent property tax records.

Jan 2, 2026 · New laws: Illinois’ grocery tax to end, drinking water protections begin Nearly 300 Illinois laws took effect Jan. 1. The Illinois’ 1% statewide grocery tax is eliminated, but more …