Reg 1 illinois 2026

1. Click ‘Get Form’ to open the REG-1 Illinois Business Registration Application in the editor.
2. Begin by identifying your business or organization. Enter your Federal Employer Identification Number (FEIN) and select the appropriate organization type, such as Proprietorship, Partnership, or Corporation.
3. Fill in your legal business name and any 'Doing-business-as' (DBA) names if applicable. Provide your primary business address, ensuring it is not a PO Box.
4. Complete the contact information section, including a designated contact person for your business. This includes their email and phone number.
5. Identify owners, officers, and general partners by providing their names, titles, and contact details as required. If necessary, attach Schedule REG-1-O for additional entries.
6. Describe your business activities in detail. Indicate whether you will have employees and provide relevant dates for when these activities will begin.
7. Review all sections for accuracy before signing at the end of the form. Ensure that you include any necessary schedules attached to your application.
8. Finally, mail your completed application to the Illinois Department of Revenue at the specified address.

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