How to File an Illinois DBA

How to Use this Guide

Use the guide below to file a DBA or have a professional service do it for you:

– LegalZoom ($99 + state fee) for the most popular DBA filing service available.

– CorpNet ($108 + state fee) for a more personalized DBA filing service.

Amy M. Toepper, Esq.
This Guide is Attorney Approved

Amy Toepper is a licensed Illinois attorney & founder of Legal In A Box.

For a legal advisor on your side, set up a free consultation.

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).

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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.