Business Income Tax Forms

Information about 2020 estimated payment changes due to COVID-19 can be found in Informational Bulletin FY 2020-26.

Credit carryforward amounts that are comprised of payments received after April 15, 2020, will be applied to the quarter in which they would be considered timely paid based upon the date the payment was received.

Corporate Income Tax - IL-1120

Exempt Organization Income and Replacement Tax - IL-990-T

Fiduciary Income and Replacement Tax - IL-1041

Partnership Replacement Tax - IL-1065

Small Business Corporation Replacement Tax - IL-1120-ST

Withholding Tax (Payroll) - IL-941

Illinois Department of Employment Security Forms (Unemployment)