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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems. We are aware of this issue and are diligently working on restoration.

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Substitute Forms Developers

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

  • 2024 Guidelines for Substitute Tax Forms (Form IL-8633-SF)- Technical specifications, enrollment form, and testing requirements. New Guidelines and Enrollment for 2024 tax year will be available at the end of August.
  • 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.