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Substitute Forms Developers
Creating your own version of Illinois Department of Revenue tax forms?
- 2024 Form IL-8633-SF, Substitute Forms Provider Annual Enrollment and 2024 Guidelines for Substitute Tax Forms (Form IL-8633-SF Instructions)- Technical specifications, enrollment form, and testing requirements. New! Form IL-8633-SF is now available as a fill-in pdf. Email completed form to REV.VendorForms@illinois.gov.
- Draft Forms - Complete and submit Form IL-8633-SF to access this page.
NOTE: If your substitute forms print from electronic filing software you develop, you must separately enroll and test your software. See Electronic Transmitters/Software Developers. You may request access to the Illinois draft forms by emailing the completed Form IL-8633-SF to REV.VendorForms@illinois.gov.
NOTE: IL-1040 for Software Developers
Test cases, schemas, and business rules are located on the FTA's State Exchange System (SES). To request access to the SES, email your user's name and email address to Rev.TaxLOI@illinois.gov. You will need to complete the Tax Software Provider Illinois Department of Revenue Letter of Intent, submit it to Rev.TaxLOI@illinois.gov, and obtain approval to access the test cases, schemas, business rules, and developer guide.