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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.

Tax Professionals

Tax Pro Alerts

Tax Practitioners - Tax Form Preparers, Tax Attorneys, and other Tax Professionals can find information here to assist them with their clients.

Electronic Transmitters/Software Developers - Software developers and transmitters can find information here about our technical specifications, enrollment, and testing requirements.

Substitute Forms Developers - If you produce, or intend to produce, your own version of the official tax forms, you can find information here about our technical specifications, enrollment, and testing requirements.

Additional Information for Tax Professionals

Qualified Practitioners and Certified Audits under the Local Government Revenue Recapture Act