Reg-1 Form Illinois - If you have questions, visit our website at tax.illinois.gov or call us weekdays between 8:00 a.m. May 2023 for businesses without a mytax illinois logon: Click here to go to mytax illinois to file your application online. Complete the form, ensuring all required information is provided. Identify your business or organization. Register faster using mytax illinois, our online account management program, available at mytax.illinois.gov. Web filing online is quick and easy! Web electronically register through mytax illinois (approximately one to two days to process); Mail the completed form to the address provided on the form. Click here to download the pdf form.
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