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Form Instructions 1120 Illinois Cook: What You Should Know

State and Local Tax May 6, 2025 — Illinois taxes corporations on all of its assets unless they are business related, in which case they should only be taxed on the income received from the business. Tax Rates—Illinois.gov — Illinois is a flat tax. You may not have to file a separate state income tax return or pay any special withholding tax.  Illinois Individual Income Tax Return — Taxpayer's Guide, Vol. 4 (Illinois Tax Guide) — You are supposed to file an annual Illinois tax return with Illinois Form 1120, Income Tax Return. See The Illinois Income Tax Return. You will probably see a number of notices to do this each year. I will explain them as they present themselves in a separate guide later in this series. Illinois Corporate Income Tax Returns — IRS For Illinois corporations only, Form 1120 is not a tax return. Instead, it must be filed by filing your IRS filing instructions, including Form 1120-ES. I will cover how to get your Illinois corporate income tax return and IRS forms later in this series. Tax Rates This is a very important part — I'm not going to cover all the income tax rates in Illinois or at any other level. See Illinois Individual Income Tax Rates You will probably see a number of notices to do this each year. I will explain them as they present themselves in a separate guide later in this series. Illinois Corporate Income Tax Returns- IL Business Tax Rates Forms Required in Illinois These forms must be filed: Illinois Corporation Income Tax Return (Form IL-1120) This is the only federal-type return you will want to file.  Illinois Individual Income Tax Return (Form 1120) Form 1120 is the Illinois equivalent to the U.S. forms. It may be required, depending on your location. This form can be filed with your state tax return or with your Illinois Form 1120-ES. See Illinois Form 1120 Instructions. Illinois State-Based Business Tax Return (Form IL-2120) This return is needed for Illinois businesses that have no tax basis in tangible property. It also needs to be filed by the individual taxpayer filing his/her federal business taxes. See the Form 2120 Instructions for additional information.

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