Follow the steps to successfully complete the IL DoR REG-1 online.

1. Click ‘Get Form’ button to obtain the form and open it in your preferred editor.
2. Begin by identifying your business or organization. Enter your Federal Employer Identification Number (FEIN), or if you're a proprietorship, your Social Security number (SSN) for tax filing.
3. Select the organization type that applies to your business from the available options, including proprietorship, partnership, trust, estate, corporation, and others.
4. Provide your legal business name in the corresponding field.
5. If applicable, enter your Doing-Business-As (DBA) or trade name if it differs from your legal business name.
6. Fill in your primary business address, including apartment or suite number, city, state, and ZIP code. If your mailing address is different, be sure to provide that information as well.
7. Identify a contact person regarding your business, including their name, title, phone number, and email address.
8. In the next section, identify your owners and officers, providing names, titles, and Social Security numbers or FEINs as required. If additional individuals need to be identified, attach Schedule REG-1-O.
9. Describe your business activities in detail, including your North American Industry Classification System (NAICS) number. Confirm if you will have employees in Illinois.
10. Check all applicable business types and activities, providing any necessary dates regarding the commencement of these activities.
11. Finally, sign the form under penalties of perjury, ensuring all information provided is accurate and complete. Include your SSN, address, and phone number.
12. Review all completed sections for accuracy, save your changes, and proceed to download or print the document if needed.

Complete your IL DoR REG-1 application online today to ensure timely registration of your business.