How to Form an LLC in Chicago, IL — 2026 Filing Guide

Required?

Yes

Who can serve

Illinois resident individual with a physical IL street address, or a business entity authorized to act as registered agent in Illinois (no PO boxes)

Can I serve myself?

Yes

Commercial RA cost

~$100/yr

Illinois Articles of Organization require member or manager names on the public filing — the RA address alone does not provide Wyoming-level privacy. For reduced member exposure, use a manager-managed structure with a nominee manager. Commercial RA services ($50–$150/yr) handle legal mail and ensure a stable registered address for out-of-state owners.

Renewing or switching? Compare standalone registered agent services — Northwest, Harbor Compliance, Registered Agents Inc., InCorp, and more.

1. Check name availability with the Illinois Secretary of State Search the Illinois SOS name database at ilsos.gov to confirm your desired LLC name is available. The name must include a valid designator (LLC, L.L.C., Limited Liability Company, or Limited Liability Co.) and must not be deceptively similar to an existing IL entity. Optional: reserve for 90 days ($25) while you prepare documents.
2. Appoint an Illinois registered agent Designate a registered agent with a physical Illinois street address (no PO boxes). Illinois residents may self-serve as RA. Out-of-state owners use a commercial RA service ($50–$150/yr). Note that Illinois Articles require member or manager names on the public filing — if privacy is a concern, a manager-managed structure using a nominee manager reduces member disclosure.
3. File the Articles of Organization ($150) with IL SOS File online at ilsos.gov. For a member-managed LLC, list all member names and addresses. For a manager-managed LLC, list manager names (members need not be listed). Pay the $150 filing fee. Standard processing is approximately 10 business days; expedited processing available for an additional fee.
4. Adopt an Operating Agreement (required by IL law) Illinois LLC Act (805 ILCS 180/15-5) requires that members adopt an Operating Agreement, though it is not filed with the state. The OA governs member rights, profit distributions, management authority, and dissolution. Illinois is one of the few states that legally mandates an OA — a customized agreement is essential for multi-member LLCs where members have unequal contributions or rights.
5. Obtain an EIN from the IRS After the Articles of Organization are approved, apply for an EIN at irs.gov/ein. The online application takes under 15 minutes and provides the EIN immediately. Print the CP 575 EIN Confirmation Letter for bank account opening.
6. Register with the City of Chicago BACP for a city business license Most businesses physically operating in Chicago must obtain a City of Chicago business license from the Department of Business Affairs and Consumer Protection (BACP). Register through the Chicago Business Compliance Portal at businesscompliance.chicago.gov. Typical fees for retail or professional services run $250–$400. License fees vary by industry, business type, and annual gross revenue. Some home-based or very low-revenue businesses qualify for reduced fees or exemptions.
7. Register for Illinois sales tax if selling taxable goods or services in Chicago If your LLC sells taxable goods or services in Chicago, register with the Illinois Department of Revenue (MyTax Illinois at mytax.illinois.gov) for a Sales Tax Permit. Chicago's combined sales tax rate is 10.25%: state 6.25% + Cook County 1.75% + City of Chicago 1.25% + RTA 1%. Businesses must collect and remit the full 10.25% on taxable Chicago sales.
8. File the Annual Report by the anniversary month each year Illinois LLCs must file an Annual Report by the first day of the LLC's anniversary month each year ($75). File online at ilsos.gov. A $100 late penalty applies for missed deadlines; continued non-filing results in administrative dissolution.
9. Open a business bank account Bring your EIN Confirmation Letter, Articles of Organization, Operating Agreement, and city business license to the bank. A separate business account is essential to maintaining the LLC's liability protection and satisfying Chicago contracting requirements.

Illinois Limited Liability Company Act, 805 ILCS 180 et seq.; Illinois Annual Report: 805 ILCS 180/50-10; Chicago BACP licensing: Chicago Municipal Code Title 4; Illinois Personal Property Replacement Tax: 35 ILCS 5/201(c); Illinois Retailers' Occupation Tax Act, 35 ILCS 120; Chicago Sales Tax: Chicago Municipal Code § 3-40; IRS guidance on single-member LLC disregarded entity treatment.

Direct filing portal: https://ilsos.gov/corporatellc/

Formation context

Who should form in Illinois?

Recommended for

Businesses that actually operate in Chicago (office, employees, or primary customer base in IL) who want to avoid dual-state filing costs; Midwest commercial LLCs in manufacturing, distribution, professional services, fintech, and food/hospitality that need a recognized IL entity for contracting and banking; Operating companies that expect to remain in Illinois long-term and do not need formation-state structural advantages

Tax treatment (default)

Pass-through by default at the federal level: single-member LLCs are disregarded entities (Schedule C); multi-member LLCs are partnerships (Form 1065). Illinois taxes pass-through LLC income at the individual member level via the 4.95% flat Illinois income tax. Illinois does not impose a franchise tax on LLCs. The Illinois Personal Property Replacement Tax (PPRT, 1.5%) applies only to LLCs taxed as corporations — not to standard pass-through LLCs.

For businesses physically operating in Illinois, forming directly in Illinois avoids the dual-state cost of a Wyoming, Delaware, or Nevada formation plus Illinois foreign qualification (~$150). Formation-only state advantages (WY charging-order, DE Court of Chancery) apply mainly to holding structures and investor-facing entities — not to operating Chicago businesses.

No publication requirement in Illinois — unlike New York or Nebraska, you do not need to publish notice in a newspaper after filing.

FAQ

Common Illinois (Chicago) LLC formation questions

Still deciding between an LLC, sole proprietorship, S-Corp, or C-Corp? Our entity-type comparison breaks down formation cost, tax treatment, liability shield, and compliance complexity for all four structures side by side.

Once your LLC clears ~$80K in annual net profit, an S-Corp election (IRS Form 2553) typically saves $5,000–$15,000/year in self-employment taxes by splitting owner income into a W-2 salary + tax-free distributions. The election is free — Form 2553 has no IRS filing fee. The key decision factors: your net income level, a defensible reasonable-compensation salary, and the 75-day Form 2553 filing window after LLC formation.

Already operating as a sole proprietor, or wondering whether a cheap county DBA filing ($10–$100) is enough instead of forming an LLC? A DBA lets you operate under a trade name — but provides zero liability protection. Our DBA vs LLC comparison breaks down exactly when a DBA is sufficient and when you need a state LLC filing.

Missing your annual report deadline triggers late fees and — if left long enough — administrative dissolution, which voids your LLC's liability shield until reinstated. Know your Illinois deadline, fee, and the consequences of missing it.

Also see the LLC annual report requirements hub for state-by-state deadlines, fees, late penalties, and reinstatement rules.

If your LLC opens an office, hires employees, or regularly does business in another state, you must foreign-qualify there — or face fines, back taxes, and loss of standing to sue. Our foreign qualification guide covers when you need it, how to file a Certificate of Authority, and what it costs.

Your Articles of Organization are filed — now make your LLC operational. Four actions every new LLC owner needs to take:

Formation gets your LLC into existence; contracts, trademark protection, operating agreement review, and vendor-document review keep it usable. Compare subscription and per-document legal platforms before you rely on a template or pay a local attorney retainer.

Commingling personal and business funds is the #1 way LLC owners lose their liability shield. A separate business account — in your LLC's legal name, with your EIN — is the foundational act of corporate formality. Mercury, Novo, Bluevine, Relay, and Found open same-day with no monthly fees. Compare online banks vs. Chase and Bank of America.

How you pay yourself depends on your LLC's tax classification — not what you call the transfer. A disregarded single-member LLC pays via owner draw with SE tax on all net profit. An S-Corp-elected LLC splits income between a W-2 salary (FICA applies) and tax-free distributions. Getting this wrong triggers IRS audit risk and SE-tax errors.

Single-member LLCs file Schedule C with their personal Form 1040 (due April 15). Multi-member LLCs file Form 1065 by March 15. S-Corp-elected LLCs file Form 1120-S by March 15. Know your form, your deadline, and the common deductions — home office, vehicle, retirement contributions, and startup costs — before your first April filing.