Form an LLC · IL

How to form an LLC in Illinois

Illinois LLCs are formed by filing Articles of Organization with the Illinois Secretary of State, Department of Business Services, Limited Liability Division — the official filing fee is $150 (see the fee notes below). Corpus prepares and files it for $274 all-in, including your first year of registered-agent service.

Form your Illinois LLC

What Illinois requires

Formation document
Articles of Organization verified 2026-09-24
Filing office
Illinois Secretary of State, Department of Business Services, Limited Liability Division verified 2026-09-24
Illinois filing fee for the Articles of Organization
$150 Articles of organization. verified 2026-09-30
  • Optional: $25 application to reserve a name (optional; filing the reservation does not establish an LLC). source
  • The Secretary of State articles instructions state Articles of Organization $150 (10 business days) and $250 for 24-hour service. Form LLC-5.5 states Filing Fee: $150, and the organizing guide states an initial $150 filing fee. The General Assembly ILCS database states the same $150 but says it should not be cited as an official or authoritative source. The series-LLC articles line on the instructions page is excluded. source · source 2 · source 3 · source 4 · source 5
Online filing
Yes — You can file Illinois LLC Articles of Organization online through the Secretary of State. verified 2026-09-24
Standard processing time
Expedited service, if requested, is same day or within 24 hours. The statute pages opened do not state a standard non-expedited processing duration. verified 2026-09-30
Expedited options
Expedited service for articles of organization $100 (same day or within 24 hours under 805 ILCS 180/50-50; the $150 articles fee is in section 50-10) verified 2026-09-30
  • Quoted from the General Assembly ILCS database (805 ILCS 180). That site says it is not the official published text and should not be cited as authoritative. www.ilsos.gov accepted TLS but returned no HTTP body, so the Secretary of State fee page could not be saved. The $100 expedite figure is the section 50-50 fee, not a combined total with the $150 filing fee. No page opened stated a $250 total. source · source 2
Name requirement
The name must contain “Limited Liability Company,” “LLC,” or “L.L.C.” verified 2026-09-24
Registered agent
Required — An Illinois LLC must appoint and maintain an Illinois registered agent. verified 2026-09-24
LLC statute
Illinois Limited Liability Company Act, 805 ILCS 180/1-1 et seq. verified 2026-09-24

What you’ll need

The Corpus intake collects this information to prepare the filing. Some questions are asked only when they apply — for example, the management question is asked only when the company has more than one owner.

  • What do you want to name the company?
  • In a sentence, what will the business actually do?
  • Where should official mail go — street, city, state, ZIP?
  • What email should we use for this order?
  • Which industry code fits this business?
  • Besides you, will anyone else have authority to make decisions for the business?
  • Who owns this company?

Illinois asks nothing beyond the standard questions.

What it costs with Corpus

State fees (filing fee + the state's processing charges)
$154
Registered agent, year one
$100
Corpus service
$20
Total at checkout
$274

$154 = Illinois’s $150 in formation fees for an online filing + $4 of other state processing charges for the way Corpus files (expedite, card or online-portal fees).

Registered agent renews at $99/yr after the included first year — cancel anytime. Itemized pricing for every state is on the price grid; how Corpus compares to other formation services is on the comparison page.

After you form: staying in good standing

Annual report
Annual report — before the first day of the LLC's anniversary month each year. verified 2026-09-30
  • Form LLC-50.1 states Filing Fee: $75. The organizing guide states the annual report is due before the first day of the LLC's anniversary month. The General Assembly database states delivery within 60 days immediately preceding that day, and states $75 plus a series add-on, but says it should not be cited as an official or authoritative source. The series add-on is not recorded. The online instructions assess a payment processor fee but do not state its amount. source · source 2 · source 3 · source 4 · source 5
Report fee
$75 verified 2026-09-30
Franchise or privilege tax
Only if a partnership-classified LLC has net income and is not an investment partnership. verified 2026-09-30
  • Rates, caps, thresholds, apportionment and exemptions: see Illinois Department of Revenue. A disregarded single-member LLC has no Illinois income tax filing requirement. source · source 2 · source 3

Comparing what registered-agent service costs after year one across providers? The comparison page publishes renewal prices.

Form it with your AI agent

You don’t have to do the intake here. Any agent that can open a link can run the whole thing — Corpus’s formation tools give it Illinois’s requirements and live price, it asks you the questions above, and it hands back a prefilled link you review and pay. Paste this into your assistant:

Form an LLC in Illinois for me with Corpus (corpuslaw.us). Use its formation tools to get Illinois's requirements and price, ask me what you need, and give me the prefilled link.

The guide is on /agents, the protocol reference is /docs/mcp, and the installable skill for this state is the Illinois SKILL.md.

Sources

Every verified fact above names where Corpus read it and the date it was last verified. Sources marked secondary are third-party write-ups used only where an official page did not publish the answer.

Corpus is not a law firm and does not provide legal advice. Fees and rules change — each verified fact above shows the date Corpus last verified it; anything marked “not yet verified” should be confirmed with the filing office.