How to start an LLC in Illinois: 9 steps, cost and checklist

Confirm that Illinois is the right formation state

For most owner-operated businesses, the sensible starting point is the state where the founder and team actually work. Forming elsewhere does not erase the operating state's rules. It can create foreign qualification, a second registered agent, two annual calendars and fees in both jurisdictions.

Use Illinois when the business genuinely operates there or when a documented legal, investor or commercial reason supports it. Compare the Illinois cost and annual-fee guide before filing. Non-US founders with no physical US operating state should compare banking access, total recurring cost and home-country tax rather than selecting only by reputation.

Choose a distinguishable Illinois LLC name

Search the official registry using the distinctive words, then test close spellings, plurals and punctuation. A search result is preliminary: the filing office makes the final availability decision when it reviews the submitted document. Include the required LLC ending and avoid restricted words unless you have the necessary approval.

State acceptance is not trademark clearance. Search the USPTO database, web results, domains, app stores and relevant marketplaces before investing in a brand. A legal entity name, DBA and trademark answer different questions.

Use the nationwide LLC name-search guide

Appoint a registered agent

The LLC must maintain an Illinois registered agent and registered office with a valid street address. A P.O. Box alone is not an acceptable registered-office address.

The agent receives lawsuits and official notices; it is not automatically a general mail-forwarding address, office lease or bank address. A founder who has a reliable qualifying address can sometimes serve personally. A service can improve privacy and continuity, but read what mail is included and how quickly notices are forwarded.

Secure the agent before filing and keep it active until the LLC is formally dissolved or withdrawn. Losing the agent can lead to missed legal papers and administrative dissolution.

File the Articles of Organization (Form LLC-5.5)

Submit the formation filing through the official Illinois Secretary of State, Department of Business Services route. The required state charge is $150 standard filing; expedited service costs extra. A service's price sits on top of—not instead of—the government fee. Use names, addresses and management facts that match the real company because the accepted record becomes the source for banks, the IRS and counterparties.

• Illinois's online organization route is available for a domestic LLC that is not forming a series and does not need special purpose provisions. Prepare the name, purpose, registered agent, registered office, principal office and organizer details.
• The standard Articles of Organization fee is $150 for regular processing. Illinois lists a $250 24-hour service option and separate processor charges.
• An Illinois LLC can choose member- or manager-managed governance and may need extra provisions or legal review for a series, professional activity or unusual purpose.

Open the official Illinois filing page ↗

Save the acceptance, filed document, receipt and state entity number outside any provider dashboard. Reject unsolicited mail selling certificates, posters or EINs unless a real law or transaction requires the product.

Create and sign an operating agreement

The operating agreement is the internal rulebook. State formation documents are intentionally short and do not fully answer who owns what, who can sign, how profits are distributed, whether another member can join or what happens after a dispute or death.

A one-owner agreement should document ownership and separation from the individual. A multi-member agreement should cover contributions, percentages, voting, manager authority, tax allocations, distributions, transfers, exits, deadlock and records. Make the effective date and ownership schedule consistent with the formation and accounting records.

Do not upload the operating agreement to the public registry unless a specific official process requires it. Keep signed copies in the permanent company file and provide them only to appropriate banks, advisers and counterparties. Use the editable operating-agreement and formation-records templates →

Get an EIN from the IRS

Form the LLC first, then request the Employer Identification Number using the accepted legal name and responsible-party facts. The IRS issues EINs without a government fee. Eligible US-based applicants with a responsible party who has an SSN or ITIN can use the online application; international applicants may need the Form SS-4 phone, fax or mail route.

An EIN identifies the business for federal purposes but does not create the LLC, grant tax-exempt status or replace state registrations. Save the assignment notice. Banks and tax preparers often ask for it, and correcting a mismatched name or responsible party later creates avoidable delay.

International founder? Read the EIN-without-SSN guide

Open a business account and separate the money

Use an account in the LLC's legal name for business receipts and expenses. Banks commonly request the accepted formation document, EIN evidence, operating agreement, ownership information and identity documents. Nonresident eligibility varies by residence country and business activity, so confirm acceptance before paying for an entity solely to access banking.

Do not mix personal spending with company funds. Record owner contributions, reimbursements, loans and distributions separately. Give each user individual access, enable two-factor authentication and keep bank statements in the company archive.

Research bank and payment eligibility by country

Register tax accounts, licenses and payroll

Review Illinois Department of Revenue registration for sales tax, withholding and other tax accounts, plus Illinois Department of Employment Security registration for employees. County and city licenses, local business taxes and professional approvals are separate.

Federal tax classification depends on ownership and elections, not the formation-state marketing label. A single-member domestic LLC is generally disregarded by default, while a two-member LLC is generally a partnership. Foreign ownership, employees, inventory, licensed work and an S-corporation election add distinct filings.

FinCEN currently exempts entities created in the United States from federal BOI reporting under the CTA. Foreign entities registered to do business in a US state can still be reporting companies unless exempt. Recheck FinCEN at the time of formation because this rule has changed rapidly.

Calendar the first and recurring deadlines

File an Illinois LLC Annual Report every year before the first day of the anniversary month. The current annual-report fee is $75, and late penalties must be paid with the filing.

• Illinois does not require a newspaper formation notice for a standard domestic LLC.
• A name must be unique and include Limited Liability Company, LLC or L.L.C. An administratively dissolved name is generally unavailable to another entity for three years after the dissolution notice.
• Changing the LLC name, purpose, duration, management type, registered agent or registered office may require an amendment separate from the annual report.

Build one calendar covering the state report, registered-agent renewal, federal and state returns, sales tax, payroll, licenses and provider renewals. Assign a person, not only a reminder. Save every accepted filing and payment confirmation.

Build a free LLC compliance calendar