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.

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

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.

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

1 day ago · 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.

5 days ago · A range of changes in individual tax rates and breaks could boost household war chests in early 2026 through a combination of larger refunds during the filing season and larger take-home …

1 day ago · The new budget for Chicago is now in effect and while some tax changes won't begin right away, others have already arrived.

Tax planning is for everyone. Get ready today to file your federal income tax return. Planning ahead can help you file an accurate return and avoid delays that can slow your tax refund. The One, Big, …

The Internal Revenue Service (IRS) administers and enforces U.S. federal tax laws.