The department has the ability to electronically receive and process the ST-1, Sales and Use Tax and E911 Surcharge Return, and the ST-2, Multiple Site Form. Participation in the Illinois Electronic Filing Program for Sales & Use Tax returns is available to software developers, transmitters, Electronic Return Originators (EROs), and taxpayers. To enroll, complete Form IL-8633-B, Business Electronic Filing Enrollment. Note: Participants using our free MyTax Illinois program do not complete Form IL-8633-B.
To use this method of electronic filing, you can write your own software or buy software from an accepted electronic filer (third party). If you wish to create your own software for filing or create software to sell, please refer to the STS-81, Implementation Guide for Direct Electronic Filing of Sales and Use Tax. Once we have received your enrollment form, we will contact you regarding testing.
New: The record layouts for Form ST-1 are changing effective January 1, 2013. The Form ST-1 has not changed. Changes to record layouts include field lengths and start and ending positions. The error codes have also been updated. These updates will require changes to existing software for Illinois Sales Tax. IDOR is requiring additional software testing to ensure the changes are made and the software is calculating the return correctly.
Electronic filing documentation effective 1/1/2013 (version ST1V2.0)
Electronic filing documentation prior to 12/31/2012 (version ST10711)