Approved Third Party Software Vendors for Sales and Use Tax
If you choose to have a third party file your return, the following are vendors who are approved by the department to electronically file sales and use tax returns:
Note: Software vendors will be approved after they register and have their product approved through testing. These companies may be web-based companies or traditional software development companies who produce a product that formats and transmits electronic returns.
For questions regarding this program, please contact the Electronic Commerce Division at 1-866-440-8680.
Note : Some taxpayers are required to pay their tax electronically using Electronic Funds Transfer.
Level the Playing Field for Illinois Retail Act
For information regarding Certified Service Providers (CSPs) and Certified Automated Systems (CASs), refer to the Resource Page for the Level the Playing Field for Illinois Retail Act.