An Illinois business entity search confirms name availability and shows the public record of any LLC or corporation on the state register. It is free and runs on the Secretary of State's own portal.
Where the official Illinois business search lives
https://apps.ilsos.gov/corporatellc/
Run by the Illinois Secretary of State, Department of Business Services. Free, no login. Search by entity name or file number. Note that Illinois runs separate lookups for corporations and LLCs in some views, so if a name does not appear, check you are searching the right register.
What the official search will not tell you
- Who owns the company. Managers may appear on some filings, but the search result does not give you full ownership.
- Trademark clearance. Separate from state distinguishability.
- Tax standing. Illinois Department of Revenue standing is tracked separately.
- Local licensing. Chicago and other municipal licences do not appear here.
Key Illinois business search terms
| Term | What it means in Illinois |
|---|---|
| Active | Registered and current on the annual report. |
| Not in Good Standing | The annual report is overdue or a fee is unpaid. |
| Dissolved | The entity has been closed, voluntarily or administratively. |
| File Number | Illinois' entity identifier. Not an EIN. |
| Registered Agent | Required, with a physical Illinois street address. |
| Articles of Organization | The document that forms an Illinois LLC. $150. |
| Annual Report | $75 per year, due in the month before your anniversary month. |
| Certificate of Good Standing | Official confirmation the entity is active and current. |
Step by step
Step 1. Open the Corporation and LLC Search
Go to apps.ilsos.gov/corporatellc. No account is needed.
Step 2. Search by name or file number
For a name check, search the distinctive words rather than the full legal string.
Step 3. Check the right register
Illinois separates corporation and LLC records in some search views. If your result set looks empty, confirm you are querying the right entity type.
Step 4. Read the status
"Not in Good Standing" is the status to watch. It means overdue filings rather than closure.
Step 5. Open the entity detail
The detail view gives file number, formation date, registered agent, and the entity's status history.
Illinois entity status decoder
- Active. Registered and current on the annual report.
- Not in Good Standing. The annual report is late or a fee is unpaid. The entity still exists but is not current, and cannot obtain a Certificate of Good Standing in this state.
- Dissolved. Closed. Administrative dissolution follows prolonged failure to file. Reinstatement is possible by filing what is owed plus a reinstatement fee.
- Revoked. Registration ended, typically for a foreign entity.
Illinois costs, honestly
| Illinois | Wyoming | |
|---|---|---|
| Filing fee | $150 | $100 |
| Annual report | $75 | $60 |
| Deadline | Month before anniversary month | First day of anniversary month |
| Owner names public | Managers on some filings | No |
| 5-year state cost | about $525 | about $340 |
Illinois is mid-range on cost. It is not a state anyone forms in for tax or privacy reasons. If you are forming in Illinois it is almost always because you operate there, which is the correct reason.
If the name is available, or taken
Available. Reserve it for 90 days, or file and secure it at registration.
Taken. Check whether the existing entity is Dissolved. Otherwise change a distinctive word so the name is distinguishable.
Check your name and form your US LLC from $249 →
Illinois business entity search for non-US founders
The search is public and free worldwide, and non-residents can form and own an Illinois LLC without visiting the US.
Whether you should is the more useful question. Illinois offers no privacy or tax advantage over Wyoming and costs more each year. It makes sense if you have Illinois operations, staff or premises. Without those, another state usually serves better.
You will need a registered agent with a physical Illinois address either way.
Talk to us on WhatsApp · Form your US LLC from $249 →
Next steps
Forming a new company:
- Confirm the name on apps.ilsos.gov/corporatellc.
- Appoint a registered agent with an Illinois street address.
- File the Articles of Organization, $150.
- Get your EIN from the IRS.
- File the $75 annual report in the month before your anniversary month.
Researching an existing business:
- Confirm status is Active, not "Not in Good Standing".
- Note the file number and registered agent.
- Review the status history.
- Order a Certificate of Good Standing if you need official proof.