1. Form Instructions for 1299-B Enterprise Zone or Foreign Trade Zone (or sub-zone) Subtractions (for corporations and fiduciaries) - Illinois

2. Form Schedule 1299-B Enterprise Zone or Foreign Trade Zone (or sub-zone) Subtractions (for corporations and fiduciaries) - Illinois

3. Form Instructions for IL-1040-X Amended Individual Income Tax Return - Illinois

4. Form ST-1-X Amended Sales and Use Tax and E911 Surcharge Return - Illinois

INSTRUCTIONS: ILLINOIS AMENDED SALES AND USE TAX AND E911 SURCHARGE RETURN (Form ST-1-X) Illinois retailers must regularly file a form ST-1 documenting their sales and use tax paid. If the information submitted on this f ...

5. Form IL-941 Illinois Withholding Income Tax Return - Illinois

6. Form IL-501 Payment Coupon and Instructions - Illinois