LLC Corporation Formation Services in Chicago
LLC and Corporation Formation Services in Chicago, IL
Chicago is the third largest city in the United States and the commercial center of the Midwest. Professional services firms in the Loop, trading and derivatives shops on Wacker Drive, logistics operators near O’Hare and Rosemont, food and manufacturing companies in Fulton Market, and one of the country’s deepest pools of small real estate investors all need the same thing to operate: a properly formed entity, in good standing, with the Illinois Secretary of State.
vState Filings LLC has handled entity formation and corporate compliance filings since 2007 for more than 100,000 clients nationwide. We file in Illinois every week, and we know where Illinois differs from the states around it. Call (866) 638-3309 to talk through your structure before you file.
Why Chicago Businesses Choose vState Filings LLC
Most filing errors in Illinois are not dramatic. They are a missed anniversary month, a registered agent address that stopped being valid, or a professional entity formed as a plain LLC when the license board required something else. Those small errors surface later — at a closing, a bank onboarding, a lease signing, or a state contract bid — and they are expensive to unwind at that point.
We work as a filing agent, not a template vendor. Your documents are prepared for the specific Illinois form and reviewed before submission, and we track what comes back from Springfield. We also handle the follow-on work most businesses need in the same file: EIN, registered agent, annual report calendaring, foreign qualification, certified copies, and apostille.
Nineteen years of filing history matters when a rejection needs to be fixed in 48 hours because a lender is waiting. Reach us at (866) 638-3309.
What Sets Us Apart
- Illinois-specific review. Series LLC, PLLC, and professional corporation filings are checked against Illinois requirements before submission — not against a generic national checklist.
- Deadline tracking that reflects the real rule. Illinois annual reports are due before the first day of your anniversary month. We calendar the entity’s actual date, not a generic year-end reminder.
- One provider across states. If you are headquartered in Chicago and expanding, or headquartered elsewhere and entering Illinois, the same team handles both sides.
- Expedited handling. When timing is driven by a closing or a financing, we file expedited and confirm receipt.
- Straight answers about limitations. Including the ones below about Series LLCs, which most formation sites leave out.
Chicago Entity Formation Services — Every Business Structure Covered
LLC Formation in Chicago, IL
An Illinois LLC is formed by filing Articles of Organization (Form LLC-5.5) with the Secretary of State. The state filing fee is $150. Expedited processing is available for an additional $100, generally producing roughly 24-hour handling; standard filings typically run several business days to about two weeks depending on method and volume.
Illinois requires a registered agent with a physical street address in Illinois — a P.O. box will not satisfy the requirement — available during normal business hours. Name reservation is $25 for 90 days if you need to hold a name before filing. We prepare and file the articles, secure the registered agent, and obtain your EIN.
Illinois Series LLC
Illinois was among the first states to authorize series LLCs and remains one of a minority that do. The parent is formed on Form LLC-5.5(S) with a state filing fee of $400. Each individual series is then established by filing a Certificate of Designation (Form LLC-37.40) at $50 per series. Full detail is in the dedicated section below.
C-Corporation Formation in Illinois
Articles of Incorporation carry a $150 filing fee, plus Illinois initial franchise tax based on paid-in capital allocated to Illinois. The initial franchise tax rate is 0.15% of that base with a $25 statutory minimum, which is why $175 is the figure commonly quoted as the minimum cost to incorporate in Illinois. See the franchise tax discussion below for how the current exemption affects what most corporations actually owe.
C-corporations suit companies raising priced equity rounds, issuing multiple share classes, or planning an institutional financing — a common profile in Chicago's fintech, trading technology, and health innovation sectors.
S-Corporation Election
Professional LLC (PLLC) Formation
Illinois handles licensed professionals differently from a standard LLC. Under the Professional Limited Liability Company Act, professionals such as physicians, dentists, veterinarians, clinical psychologists, social workers, counselors, and marriage and family therapists organize as a PLLC, and the entity generally must register with the Illinois Department of Financial and Professional Regulation in addition to filing with the Secretary of State. Certain professions are limited to rendering a single professional service, with ownership restricted to licensees in that profession.
The Secretary of State filing fee matches a standard LLC at $150, with a separate IDFPR registration fee (commonly $50) depending on the profession; several boards — accountancy, real estate, and law among them — use their own application paths. Given the density of medical practices around the Illinois Medical District, Streeterville, and Hyde Park, this is the single most common structural error we correct for Chicago professionals.
Professional Corporation (PC)
Limited Partnership (LP) and Limited Liability Partnership (LLP)
The Illinois Series LLC — a Real Advantage for Chicago Property Investors
A series LLC is a single parent LLC that can establish separate protected series inside it. Under Illinois law, when a series is properly designated, its assets and liabilities are intended to be shielded from the debts of the other series and of the parent. For an investor holding a three-flat in Pilsen, a two-flat in Wicker Park, and a small mixed-use building in Lincoln Park, the appeal is obvious: one parent entity instead of three separate LLCs.
The cost math is favorable at scale. Three standalone Illinois LLCs cost $450 to form and $225 per year in annual reports. A series LLC with three series costs $400 for the parent plus $50 per series to designate, and files one consolidated annual report at $75 for the master plus $50 for each series. The gap widens as the portfolio grows.
Now the caveats, because they are real.
Lenders often do not cooperate. Many banks and agency lenders are unfamiliar with series structures, and some will require the loan to be made to a conventional single-purpose LLC instead, or demand that the parent guarantee or join in the mortgage — which can undercut the separation you formed the series to obtain. Ask your lender before you form, not after you are under contract.
Title and insurance friction. Title companies and underwriters vary in how comfortable they are vesting title in a named series and insuring it. Some handle it routinely; others will slow the file down. Cook County recording practice is workable, but confirm with your title agent early.
Out-of-state recognition is not guaranteed. If you buy in a state that does not authorize series LLCs, a court there may not honor the internal liability walls. An Illinois series LLC is strongest when the assets are in Illinois.
The separation only holds if you maintain it. Each series needs its own records, its own bank account, its own accounting, and its own leases and contracts signed in the series name. Commingle funds across series and you have handed a plaintiff the argument that the walls should be disregarded.
Case law is thin. Series liability separation has been litigated far less than the standard LLC veil. Treat it as a well-grounded but less-tested protection.
Used correctly by an investor with Illinois property, good bookkeeping, and a cooperative lender, the Illinois series LLC is genuinely useful. Used carelessly, it is one entity with sloppy records. We will tell you honestly which situation you are in, and we file both the parent and each Certificate of Designation.
Illinois Annual Reports, Deadlines, and Penalties
This is the most common avoidable failure we see in Illinois, and the rule catches people because it is not a calendar-year deadline.
Your Illinois annual report is due before the first day of your anniversary month — the month your entity was originally formed or registered in Illinois. An LLC organized on June 14 must file before June 1 each year. There is no built-in grace period in the statute.
- LLCs: $75 annual report fee. A $100 penalty applies once the report is 60 days past due.
- Series LLCs: $75 for the master plus $50 per designated series, filed as one report.
- Corporations: $75 annual report fee plus franchise tax. Late filing triggers a 10% penalty on delinquent franchise tax plus 2% per month interest. Because most corporations now owe no franchise tax after the exemption described below, the meaningful exposure is loss of good standing and administrative dissolution rather than the dollar penalty.
- Limited partnerships: $100. Not-for-profit corporations file at a nominal fee.
Miss it long enough and the Secretary of State administratively dissolves the entity. Reinstatement then requires an application with a $200 state fee, every missed annual report, and the accumulated penalties — and if another business claimed your name in the meantime, you also file an amendment to change it. The practical damage is worse than the fee: a dissolved entity fails a good standing check at exactly the moment a bank, landlord, or buyer runs one.
Illinois franchise tax — what is actually true in 2026
Illinois announced a full franchise tax phase-out in 2019, then halted it in 2021. The tax was never repealed. What exists instead is a rising exemption: as of January 1, 2025, the first $10,000 of franchise tax liability is exempt. The annual rate is 0.10% of Illinois-allocated paid-in capital, with a $25 minimum and a $2 million cap.
The practical result: the overwhelming majority of Illinois corporations now owe $0 in franchise tax — but the annual report filing obligation has not gone anywhere, and skipping it still leads to dissolution. Do not confuse “no tax due” with “nothing to file.”
Expanding Into Illinois? Foreign Qualification and Assumed Names
An out-of-state company that transacts business in Illinois — an office in the Loop, a warehouse near O’Hare, employees in Naperville or Schaumburg, a construction crew working Cook County job sites — must register as a foreign entity. Foreign LLC registration is $150; foreign corporations pay $150 plus franchise tax on Illinois-allocated capital. Once registered, the entity files Illinois annual reports on its own anniversary schedule.
Operating unregistered exposes you to back fees and penalties and can bar your company from bringing suit in Illinois courts until you cure it — a problem that tends to appear when you need to enforce a contract or collect a receivable.
Assumed names (DBAs) work at two different levels in Illinois, and mixing them up is common:
- Registered entities (LLCs, corporations) file the assumed name with the Secretary of State. The fee is prorated within a five-year cycle based on the year you file — $150, $120, $90, $60, or $30 depending on where the year falls in the cycle. The certificate expires after five years, and renewal is $150, with a $100 penalty for a late renewal. Renewals cluster in years ending in 0 and 5.
- Sole proprietors and general partnerships in Chicago file instead with the Cook County Clerk. The application must be notarized, and Illinois requires publication of the assumed name notice in a qualifying newspaper once a week for three consecutive weeks, beginning within 15 days of filing, with proof of publication returned to the Clerk within 50 days. Miss the publication step and the registration can be void.
UCC Filings and Searches for Illinois Lenders and Borrowers
Chicago’s equipment finance, freight, food service, and manufacturing sectors run on secured lending, and the Illinois Secretary of State’s UCC division is where those liens are perfected. We prepare and file UCC-1 financing statements, UCC-3 amendments, continuations, assignments and terminations, and we run lien and judgment searches with certified results.
Two situations come up constantly. First, a lender needs a same-week search before funding equipment for a logistics operator near Rosemont. Second, a borrower discovers a stale UCC-1 from a paid-off loan still sitting on the record and blocking a new facility — that requires a termination filed by the secured party, and we chase it down. We also handle UCC work in parallel states when collateral crosses state lines.
Beyond Formation — Ongoing Illinois Business Compliance
Formation is the first filing, not the last. We handle the ongoing work as a single file:
Registered agent service with an Illinois street address and reliable forwarding of service of process.
Annual report preparation and filing, calendared to your anniversary month, including series LLC consolidated reports.
EIN applications for new and existing entities, including foreign-owned companies.
Amendments, conversions, mergers, and dissolutions when ownership, name, or structure changes.
Reinstatement after administrative dissolution, including back reports and penalties.
Certificates of good standing, certified copies, and apostille for banking, licensing, out-of-state qualification, and cross-border transactions.
Nonprofit formation and 501(c)(3) support, plus Illinois charitable solicitation registration with the Attorney General’s Charitable Trust Bureau — Form CO-1 at a $15 fee, with the AG990-IL annual report due six months after fiscal year end at $15, and a $100 late fee.
Corporate supplies — seals, stock and membership certificates, and record books.
Serving Chicago and the Greater Chicagoland Area
We file for businesses across the Loop, River North, West Loop and Fulton Market, Lincoln Park, Wicker Park, Pilsen, Hyde Park, and the Gold Coast, and throughout the surrounding market — Evanston, Oak Park, Rosemont and the O’Hare corridor, Schaumburg, Naperville, and the rest of Cook County and DuPage County. Illinois filings are centralized in Springfield, so location within the state does not change the process; what changes is the industry mix, and we adjust the structure recommendation accordingly.
Ready to Form Your Chicago Business? Let's Get Started.
Whether you are forming a growing rental portfolio, a professional corporation for a medical group, or an out-of-state company opening an Illinois office. We will confirm the right structure, quote the exact state fees, and file it.
Call (866) 638-3309
or start your filing at vstatefilings.com.
Frequently Asked Questions About Business Formation in Chicago, IL
How much does it cost to form an LLC in Chicago, Illinois?
The Illinois Secretary of State charges $150 to file Articles of Organization (Form LLC-5.5). Expedited processing adds $100. After that, the recurring state cost is the $75 annual report, due before the first day of your anniversary month. There is no separate Chicago or Cook County entity formation fee, though your business may need city licenses depending on activity.
What is an Illinois Series LLC and should I use one?
It is a parent LLC that can hold multiple protected series, each intended to be insulated from the others’ liabilities. The parent costs $400 to form on Form LLC-5.5(S), each series costs $50 via a Certificate of Designation, and the annual report is $75 plus $50 per series. It works best for investors holding several Illinois properties with disciplined separate bookkeeping and a lender that accepts the structure. If your lender balks, your assets are out of state, or you will not keep separate accounts, use conventional LLCs instead.
When exactly is my Illinois annual report due?
Before the first day of your anniversary month — the month your entity was formed or first registered in Illinois. An entity formed in October must file before October 1. LLCs pay $75, with a $100 penalty once the report is 60 days late. Corporations pay $75 plus any franchise tax, and face penalty and interest on delinquent franchise tax. Continued non-filing leads to administrative dissolution.
Does Illinois still have a franchise tax on corporations?
Yes. The scheduled phase-out was halted in 2021 and the tax was never repealed. As of January 1, 2025, the first $10,000 of franchise tax liability is exempt, so most corporations owe nothing — but the annual report filing obligation remains, and the tax is calculated at 0.10% of Illinois-allocated paid-in capital with a $25 minimum and a $2 million cap.
Do I need an Illinois registered agent if I live in Chicago?
Illinois requires every LLC and corporation to maintain a registered agent with a physical Illinois street address, available during business hours. P.O. boxes are not accepted. You may serve as your own agent, but your address becomes public record and you must be present to accept service of process. Commercial registered agent service avoids both problems and keeps your filing address stable if you move.
Do doctors and lawyers in Chicago need a PLLC instead of an LLC?
My out-of-state company is opening a Chicago office. What do I file?
You register as a foreign entity with the Illinois Secretary of State — $150 for an LLC, $150 plus franchise tax for a corporation — and appoint an Illinois registered agent. Most states require a certificate of good standing from your home state, so we obtain that first. Once registered, you file Illinois annual reports on your own anniversary schedule.
Do I still have to file a BOI report with FinCEN?
For most U.S. companies, no. In August 2026, FinCEN issued a final rule permanently ending Corporate Transparency Act beneficial ownership reporting for U.S. companies and U.S. persons. Foreign reporting companies registered to do business in the U.S. remain subject to reporting for foreign beneficial owners. If foreign ownership is anywhere in your structure, confirm your position rather than assume the requirement is gone.