Skip to main content
 
 
 
 
Taxpayer Answer Center

Quick Links

Information For

About IDOR

Tax Forms

ST-556

Attention Firefox Users

Firefox uses a built-in viewer to present PDF documents by default.

This viewer does not allow users to fill in form fields. To allow fill-in forms, follow these instructions to re-enable the Adobe Acrobat Reader.

Attention Chrome Users

Chrome uses a built-in viewer to present PDF documents by default.

Some advanced features used in our PDF forms may not work with this built-in viewer. If you experience difficulty with a fill-in form, you can download the form for viewing with the Adobe Acrobat Reader by clicking the save button that appears in the lower right when you hover your mouse in that area.

Form ST-556 can now be filed electronically using MyTax Illinois, our new FREE online account management program. If you have not already done so, you will need to activate your account by clicking on the "Sign up Now!" button at mytax.illinois.gov.

Click here to go to MyTax Illinois to file your return online

Alternatively, you can obtain ST-556 forms preprinted for each of your business locations by calling our Central Registration Division at 217 785-3707.