How to file a DBA in Illinois
Filing a DBA (Doing Business As, also called a fictitious or trade name) in Illinois costs $150 in state fees, lasts 5 years, and is registered with the Cook County Clerk. We file it for you at the state cost, no service fee.
Illinois DBA at a glance
| State filing fee | $150 |
|---|---|
| Filing authority | Cook County Clerk |
| Term length | 5 years (renewable) |
| Renewal required | Yes, before expiration |
| File.Business fee | $0 |
When you need a DBA in Illinois
You need a DBA in Illinois when your business operates under a name different from its legal name. Common cases:
- A sole proprietor in Illinois doing business under a brand name instead of their legal name
- An LLC or corporation in Illinois marketing under a brand different from the registered entity name
- An out-of-state company doing business in Illinois under a different name
- Multiple brands operated under one parent LLC in Illinois
How to file a DBA in Illinois: 5 steps
- Choose your DBA name. Search the Illinois business name database to confirm the name is available. It must not be deceptively similar to existing registered names.
- Verify name compliance. Illinois prohibits names that imply a corporation (Inc., Corp.) unless your entity actually is one. Avoid restricted words.
- Prepare the DBA filing. The Cook County Clerk requires the legal name of the owner, the DBA name, business address, and a description of business activities.
- Pay the $150 state fee and submit. File online with the Cook County Clerk or use File.Business to handle it for you at the state cost.
- Track the 5-year renewal. Illinois DBAs expire and require renewal. We track this for you automatically with our compliance calendar.
File your Illinois DBA now
Our team prepares the filing, submits it to the Cook County Clerk, and tracks renewal. You pay only the $150 state fee. No service charges.
Start my Illinois DBADBA vs LLC in Illinois: which do you need?
A DBA is a name registration, not a business structure. It does not provide liability protection, separate tax treatment, or formal recognition as a business entity. If you want personal liability protection while operating under a brand name in Illinois, you typically form an LLC and then optionally file a DBA for additional brands.
Compare your options: Form an LLC in Illinois or Form a Corporation in Illinois.
Illinois DBA frequently asked questions
How long does it take to file a DBA in Illinois?
Processing time with the Cook County Clerk varies. Online filings are typically processed within 2 to 5 business days. We submit the filing the same day you order.
How long is an Illinois DBA valid?
5 years from filing date. You must renew before expiration to keep the name registration active.
Do I need an EIN if I file a DBA in Illinois?
Only if you have employees, file certain tax forms, or open a business bank account in the DBA name. Sole proprietors with no employees can use their SSN. Get an EIN.
Can I file a DBA in Illinois for an out-of-state LLC?
Yes. If your LLC is registered in another state and does business in Illinois, you typically need to foreign-qualify in Illinois first, then file the DBA.
Does an Illinois DBA protect my brand from others using the same name?
A DBA only reserves the name with the Cook County Clerk. For broader brand protection, file a federal trademark with the USPTO.
On the $129/yr Compliance Annual Filings plan, we cover state late fees.
When you autofile your annual report through the $129/yr plan and we miss the deadline, we pay the state's late fee. The guarantee applies to that specific plan and the filings it includes. Other File.Business services are billed at the prices on this page.