How to File a DBA in Illinois (3 Simple Steps)

How To Use This Guide

Use our free guide below to file for a DBA in Illinois:

Use A Professional Service

A professional service will handle filing your DBA on your behalf, allowing you to focus on the other needs of your new business.

4.4 out of 5 starsLegalZoom ($99 + state fee) for the most popular DBA filing service available.

4.6 out of 5 starsCorpNet ($108 + state fee) for a more personalized DBA filing service.

Step 1) Verify Name and Obtain Copy Of Assumed Name Application


Once you’ve selected the fictitious business name you want to file under, you'll need to ensure the name is available and that there are no trademark issues.

Follow these steps:

1.   Check name availability with your local county clerk’s office. This is also where you’ll need to get your DBA registration form.

2.   Conduct a business name search through the IL Secretary of State’s website.

3.   Conduct a TESS System search through the U.S. Patent & Trademark Office.

Step 2) Fill Out Application


Again, you will need to obtain a copy of the Assumed Name Application from your local Illinois county clerk’s office.

If you don’t have legal counsel or a DBA filing service assisting you, take your time completing this form to make sure every entry is correct. Read all instructions and answer each question as specifically as necessary.

Step 3) Mail In The Application


The final step is to get your completed Illinois DBA application notarized and mail it in (along with the filing fee).

Follow these steps:

1.    Sign the application and get it notarized.

2.    Mail your application and payment to the mailing address provided by the county clerk on the form itself.

3.    After submitting the form, publish your assumed name in the local newspaper for 3 consecutive weeks (the county clerk can assist with this).

Need Help Filing Your DBA?

If you'd like help filing an Illinois DBA, feel free to read our reviews of the two most popular services.

  • LegalZoom DBA Review: Pricing starts at $99 + state fee. Best if you're looking for the most popular DBA filing service available.
  • CorpNet DBA Review: Pricing starts at $108 + state fee. Best if you're looking for great customer service.

Note that this Illinois DBA registration guide is not legal advice. If you're looking for expert advice on filing an Illinois DBA or starting a business in general, please schedule an appointment with an accredited attorney. We highly recommend Amy Toepper.