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Substitute Forms Developers

FY 2018-29 - Illinois Income Tax Guidance - Changes for Business Income Tax - 06/21/2018

Creating your own version of Illinois Department of Revenue tax forms?

  • Guidelines for Substitute Tax Forms (Form IL-8633-SF)- Technical specifications, enrollment form, and testing requirements.
  • Draft Forms (Password protected area) - Enrollment as a substitute forms developer is required. For 2019, this page has been updated to a new format and will be available after September 25, 2019. See the Guidelines for Substitute Tax Forms for more information on how 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.