Illinois — Estimated Income and Replacement Tax Payments for Corporations
More about the Illinois Form IL-1120-ES Estimated
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File Now with TurboTaxWe last updated Illinois Form IL-1120-ES in January 2022 from the Illinois Department of Revenue. This form is for income earned in tax year 2025, with tax returns due in April 2026. We will update this page with a new version of the form for 2027 as soon as it is made available by the Illinois government.
Other Illinois Corporate Income Tax Forms:
In addition to information about Illinois' income tax brackets, Tax-Brackets.org provides a total of 76 Illinois income tax forms, as well as many federal income tax forms. Here's a list of some of the most commonly used Illinois tax forms:
| Form Code | Form Name |
|---|---|
| Schedule UB-NLD | Unitary Illinois Net Loss Deduction [OBSOLETE] |
| Form IL-1041 | Fiduciary Income and Replacement Tax Return (Includes Schedule D) |
| Form IL-1065 | Partnership Replacement Tax Return (Includes Schedule B) |
| Form IL-516-B | Pass-through Prepayment [OBSOLETE] |
| Schedule 1299-S | Enterprise Zones, Foreign Trade Zones, and Sub-Zones |
View all 76 Illinois Income Tax Forms
Disclaimer: While we do our best to keep Form IL-1120-ES up to date and complete on Tax-Brackets.org, we cannot be held liable for errors or omissions. Is this form missing or out-of-date? Please let us know so we can fix it!
Tax Form Sources:
- Illinois Department of Revenue ( https://www2.illinois.gov/rev/Pages/default.aspx )
- Department of Revenue Income Tax Forms ( https://www2.illinois.gov/rev/forms/Pages/default.aspx )