Illinois Employment Security Registration Form
The REG-UI-1 form is essential for businesses in Illinois to register for unemployment insurance tax. This guide provides detailed instructions on completing the form and the necessary information for submissions. Stay compliant with the state regulations by ensuring timely filing.
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How do I fill this out?
To fill out the REG-UI-1 form, start by gathering necessary business and contact information. Ensure you understand the various sections and what information is required for each. Follow the provided guidelines closely to avoid any omissions or errors.

How to fill out the Illinois Employment Security Registration Form?
1
Gather your business and contact information.
2
Complete each section of the form accurately.
3
Review the form to ensure all information is correct.
4
Sign and date the form as required.
5
Submit the completed form to the appropriate address.
Who needs the Illinois Employment Security Registration Form?
1
New businesses starting operations in Illinois.
2
Existing businesses expanding their operations in the state.
3
Employers required to register for unemployment insurance.
4
Businesses needing to update their employment status.
5
Non-profit organizations applying for tax exemptions.
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What are the instructions for submitting this form?
To submit the REG-UI-1 form, mail it to the Central Registration Division, Illinois Department of Revenue, PO Box 19030, Mail Code 3-222, Springfield, IL 62794-9030. For fax submissions, send to the designated fax number on the IDES website. Remember to check the specific instructions for any online submission options available.
What are the important dates for this form in 2024 and 2025?
Important dates for the REG-UI-1 form submission include 2024 and 2025 deadlines for newly created employing units. Ensure your registration is filed within 30 days of commencing business. Keeping track of key dates can maintain your compliance throughout the year.

What is the purpose of this form?
The REG-UI-1 form serves as a vital document for businesses operating in Illinois to register for unemployment insurance. This form ensures that employers fulfill their tax responsibilities under the Illinois Unemployment Insurance Act. Submitting this form allows businesses to avoid penalties and remain compliant with state laws.

Tell me about this form and its components and fields line-by-line.

- 1. Business Name: The legal name of the business being registered.
- 2. Doing Business As: Any trade name under which the business operates.
- 3. Primary Business Address: The main location where the business operates.
- 4. Phone Number: Contact number for the business.
- 5. Email Address: An email for communications and notifications.
- 6. FEIN: Federal Employer Identification Number assigned to the business.
- 7. Type of Organization: Specify the legal structure of the business (e.g., Corporation, LLC).
- 8. Acquisition Details: Information regarding any purchase or succession of the business.
What happens if I fail to submit this form?
Failing to submit the REG-UI-1 form can result in legal penalties and interest charges. It's crucial to comply with the registration requirements to avoid disruptions in your business operations. Timely submission helps maintain good standing with state authorities.
- Penalties for Late Submission: Businesses may incur fines for not submitting the form on time.
- Increased Liability: Failure to register might result in liability for unpaid unemployment insurance taxes.
- Legal Compliance Issues: Non-compliance can complicate future business dealings with state agencies.
How do I know when to use this form?

- 1. Starting a New Business: New businesses must file this form within 30 days of inception.
- 2. Changing Business Structure: If you change the type of ownership, this form needs to be resubmitted.
- 3. Updating Employer Information: Existing employers should use this form to update their registration details.
Frequently Asked Questions
How do I download the REG-UI-1 form?
You can download the REG-UI-1 form directly from PrintFriendly after editing it.
What information do I need to fill out the form?
Gather your business name, address, FEIN, and other relevant details before starting.
Is there a deadline for submitting this form?
Yes, the form must be submitted within 30 days of starting your business.
Can I save my progress while filling out the form?
You can edit and download your form, but please ensure you complete it in your session.
What happens if I provide incorrect information?
Providing incorrect information may lead to penalties or delayed processing.
Is assistance available while completing this form?
You can contact the IDES for help during business hours.
Can I fill out this form on my mobile device?
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Does PrintFriendly have a tutorial for using the editor?
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Can I print the form after editing?
Absolutely, you can print the form directly from PrintFriendly.
What is the purpose of the REG-UI-1 form?
It is used for registering businesses for unemployment insurance in Illinois.
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