Skip to main content

Scam Alert: Fake Texts and Websites Impersonating IDOR

Be alert for fraudulent messages or websites attempting to steal your banking information, login credentials, or credit card details. The Illinois Department of Revenue (IDOR) will never request personal or financial information via text message. To confirm official communications or contact details, always visit https://tax.illinois.gov.

Employment Sign Up for Updates

1998 Corporate Income Tax Forms

Name Description
IL-1120 Instr. Corporation Income and Replacement Tax Return
IL-1120-X Instr. Illinois Amended Corporation Income and Replacement Tax Return
Sch. J   Foreign Dividends
Sch. NB   Nonbusiness Income
Sch. NLD   Illinois Net Loss Deduction
Sch. UB Instr.
    		 Combined Apportionment for Unitary Business Group
Sch. UB/NLD   Unitary Net Loss Deduction
IL-477   Replacement Tax Investment Credits
IL-1118A-RE Instr. Amended Corporation Income and Replacement Tax Return for Royalty Election.
IL-1118B-RE Instr. Amended Partnership or Small Business Corporation Replacement Tax Return for Royalty Election.
Sch. 1299-B   Enterprise Zone Foreign Trade Zone/Sub-Zone Subtractions (for Corporations & Fiduciaries)        
Sch. 1299-D Instr.       
     		 Income Tax Credits (for Corporations & Fiduciaries)
Sch. 1299-S   Enterprise Zones, Foreign Trade Zones and Sub-Zones        
IL-2220   Computation of Penalties for Businesses        
Sch. 4255   Recapture of Investment Tax Credits