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Approved Third Party Software Vendors for Business Income Tax (BIT)

If you choose to have a third-party file your return or payment, you may wish to choose from the following software vendors currently approved by the department to electronically file some or all Illinois business income tax returns, corresponding forms, and schedules. Third-party software also supports electronic payments.

Note: Software vendors are deemed approved after they register and have their product approved through testing. These companies may be web-based companies or traditional software development companies that produce a product for the purpose of formatting and transmitting electronic returns and payments.

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Product Name: CSC Corptax
Website: www.corptax.com
Phone: 800-966-1639

Product Name: Blockworks
Website: www.hrblock.com
Phone: 800-472-5625

Product Name: TaxAct
Website: www.taxact.com
Phone: 800-573-4287 (support/sales)

Product Name: TaxSlayer Pro
Website: www.TaxSlayerPro.com
Phone: 888-420-1040 (sales)
706-868-0985 (support)

Product Name: Onvio Tax CS
Website: https://onvio.us/login/#/

Product Name : UltraTax CS
Website: https://tax.thomsonreuters.com/us/en/cs-professional-suite/ultratax-cs
Phone: 800-968-0600 (support/sales)

Product Name: Gosystem Tax
Website: https://tax.thomsonreuters.com/us/en/cs-professional-suite/gosystem-tax-rs
Phone: 800-865-5257

Thomson Reuters Tax and Accounting
Product Name: ONESOURCE Income Tax
Website: https://tax.thomsonreuters.com/en/onesource
Phone: 800-865-5257

Website: Tax & Accounting U.S. Hub | Wolters Kluwer

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.