How to Fill Out Illinois Form LLC-5.5 (w/Examples) + FAQs

Illinois Form LLC-5.5 is the Articles of Organization that every person forming a domestic limited liability company in Illinois must file with the Illinois Secretary of State Department of Business Services to legally create the LLC under the Illinois Limited Liability Company Act, 805 ILCS 180/. The form establishes the LLC’s legal name, registered agent, purpose, management structure, and organizers, and once accepted, it gives the entity its own legal identity separate from its owners.

According to the Illinois Secretary of State’s annual report, more than 40,000 new LLCs are formed in Illinois each year, and the agency rejects roughly 1 in 7 filings on the first pass, usually because of a registered agent error, a name conflict, or a missing signature on the official LLC-5.5 PDF. A rejected filing means the start date of your liability shield gets pushed back, which can be devastating if a customer sues, a contract closes, or a bank account opens during the gap.

Here is what you will learn in this guide:

  • 📄 What each line, box, and signature block on Form LLC-5.5 actually asks for, in plain English
  • 🧾 How to gather every document, ID number, and fee before you open the form
  • 💻 How to file online, by mail, or in person, with exact addresses, URLs, and processing times
  • 🧠 The 10 most common mistakes filers make on LLC-5.5 and the direct consequence of each
  • 🪪 Three full walkthrough examples covering a single-member LLC, a husband-and-wife restaurant, and a manager-managed tech startup

What Form LLC-5.5 Is and Who Must File It

Form LLC-5.5 is the document that brings a domestic Illinois limited liability company into legal existence. Without it, your business is a sole proprietorship or general partnership, and you have no personal liability protection at all. The form is filed under 805 ILCS 180/5-5, the section of the Illinois LLC Act that lists every required article. The current revision date printed on the form is January 2024, and you should confirm you are using that version before filing because the agency periodically tweaks fee schedules and field labels.

Anyone who wants to operate a business in Illinois with limited liability protection, pass-through taxation, and flexible management must file LLC-5.5. This includes solo freelancers, family businesses, real estate investors holding rental properties, professional service providers (though licensed professions like law and medicine usually file the related PLLC form LLC-1.36), and tech startups raising outside capital. Foreign LLCs already formed in another state do not use LLC-5.5; they file Form LLC-45.5 Application for Admission instead.

If you want a Series LLC, where one master LLC holds separate, liability-protected cells, you file Form LLC-5.5(S) and pay a higher fee. Filing the wrong version is one of the top three rejection reasons the agency reports. A Chicago paralegal named Aisha who filed a Series LLC client on the standard LLC-5.5 had to refile and pay the fee twice when the registered agent later tried to add a series.

The form is mandatory. There is no workaround, no “informal” LLC, and no retroactive formation. The date the Secretary of State stamps the form as accepted is the date your LLC legally exists, and any contract signed in the LLC’s name before that date is personally yours.

Before You Start: Documents and Information You Need

Gather every piece of information below before you open the form. The online portal times out, and the paper form must be typewritten or printed in black ink, so guessing and going back is costly.

  • Proposed LLC name with the ending “L.L.C.”, “LLC”, or “Limited Liability Company” required by 805 ILCS 180/1-10. Without the designator, the name is rejected and the $150 fee is forfeited if you do not refile within the cure window.
  • Name availability confirmation from the Illinois business name search tool. If your name conflicts with an existing entity, the filing is rejected outright.
  • Registered agent name (individual or registered corporate agent). The agent must consent in advance, or you face a malpractice issue later.
  • Registered office street address in Illinois, no P.O. boxes. A P.O. box triggers automatic rejection because 805 ILCS 180/1-35 requires a physical address for service of process.
  • Principal place of business address (can be in or outside Illinois). Missing this address delays the EIN application with the IRS.
  • Purpose statement. Illinois accepts the general “any lawful purpose” language, but regulated industries must be specific.
  • Duration, either perpetual or a specific end date. Picking a date by accident shortens the entity’s life.
  • Management structure, member-managed or manager-managed. This choice controls who can bind the LLC contractually.
  • Names and addresses of initial members or managers. Wrong addresses delay annual report notifications and can trigger administrative dissolution under 805 ILCS 180/35-25.
  • Organizer name, address, and signature. The organizer does not have to be a member but must be a real person aged 18 or older.
  • Payment method for the $150 standard fee, $400 Series LLC fee, or extra $100 for 24-hour expedited service.

A first-time founder named Marcus learned the hard way that skipping the name search costs you the entire filing fee, the Secretary of State does not refund rejected filings for name conflicts.

Where to Get the Form and How to Access It

The official Form LLC-5.5 lives on the Illinois Secretary of State’s website. You can download the fillable PDF of LLC-5.5 for mail or in-person filing, or you can use the online business services portal to complete and submit the form electronically. The online version reformats the same fields into a guided wizard, but the legal content is identical.

Do not use third-party copies of the form found on random formation-service websites. Those PDFs are sometimes outdated and will be rejected if the revision date on the bottom corner does not match the current version. Always pull the form directly from ilsos.gov.

The agency also distributes paper copies at the two walk-in counters: the Howlett Building in Springfield and the James R. Thompson Center in Chicago. Both counters keep the current revision in stock, and a clerk can answer basic procedural questions, though they cannot give legal advice.

For accessibility, the PDF is screen-reader compatible, and the online portal supports keyboard navigation. If you need translation, the Secretary of State’s office does not publish translated versions, but the Illinois Small Business Development Center network offers free bilingual help at counseling offices statewide.

Step-by-Step: How to Fill Out Form LLC-5.5 Line by Line

The form has nine numbered articles plus an organizer signature block. Each article maps to a section of the Illinois LLC Act, and each carries its own rejection trap. Walk through every field in order.

Article 1: Limited Liability Company Name

This field asks for the exact legal name of your new LLC.

Type the name in all capital letters in the box, including a required designator such as “LLC”, “L.L.C.”, or “LIMITED LIABILITY COMPANY”. Do not add punctuation that is not part of the name, and do not use forbidden words like “Bank”, “Insurance”, or “Corporation” without separate regulatory approval under 205 ILCS 5/46.

For example, Maria Lopez writes LOPEZ CREATIVE STUDIO LLC in the name box for her single-member design firm.

A common edge case is a name that includes a person’s full name or a hyphenated phrase. The agency accepts hyphens, ampersands, and apostrophes, but it rejects emojis and non-Latin characters.

The most common mistake on Article 1 is omitting the designator, and the consequence is automatic rejection with no refund. A second common mistake is choosing a name that matches an existing Illinois entity, which is why running the name search first is non-negotiable.

A frequent misconception is that reserving a name through Form LLC-1.15 automatically files the LLC. It does not, name reservation only holds the name for 90 days; you still must file LLC-5.5 to actually form the entity.

Article 2: Effective Date

This field asks when the LLC legally begins to exist.

Check the box for “the date of filing” if you want the LLC to exist the moment the Secretary of State accepts the form, or fill in a future date up to 60 days out under 805 ILCS 180/5-5(c).

For example, Janet writes 01/01/2026 as her effective date so the LLC starts on the first day of the tax year.

A nuance is that a delayed effective date is useful for tax planning, picking January 1 avoids a short-year partial return with the IRS.

The most common mistake here is writing a date more than 60 days in the future, which causes outright rejection. Another mistake is leaving both options blank, which forces the agency to default to the filing date and may surprise filers who wanted a delayed start.

A common misconception is that the effective date controls when you owe Illinois franchise tax. LLCs do not pay franchise tax; they pay an annual report fee under 805 ILCS 180/50-10, and that obligation begins the year after formation.

Article 3: Registered Agent and Registered Office

This field asks for the person or company who will accept legal papers on behalf of the LLC, and the Illinois street address where those papers can be hand-delivered.

Write the agent’s full legal name on the “Registered Agent” line, then the street number, street name, city, county, and ZIP on the “Registered Office” line. The address must be in Illinois, must be a physical street address, and must match an actual building where the agent can be served during business hours.

For example, Carlos lists CARLOS RAMIREZ as the agent and 742 W ADAMS ST, CHICAGO, COOK COUNTY, IL 60661 as the registered office.

A nuance is that you may hire a commercial registered agent service such as Illinois Registered Agent Inc. for around $50 to $300 per year, which is useful if you work from home and do not want your home address in the public record.

The most common mistake is using a P.O. box, which is forbidden by 805 ILCS 180/1-35, and the consequence is rejection. A second common mistake is naming an agent without their consent, which can lead to missed service of process and a default judgment against the LLC.

The misconception is that the registered agent is the same as the owner. The agent can be anyone over 18 who lives in Illinois, but their job is purely to receive legal documents.

Article 4: Purpose

This field asks why the LLC exists.

Write a one-sentence statement of the business activity. The safe default is “The transaction of any or all lawful businesses for which Limited Liability Companies may be organized under the Illinois Limited Liability Company Act.” Regulated industries like cannabis under the Cannabis Regulation and Tax Act, 410 ILCS 705/ must state the specific licensed activity.

For example, Aisha writes the transaction of any or all lawful businesses for her freelance design LLC.

A nuance is that being too specific can backfire: if you write “to operate a coffee shop” and later pivot to selling baked goods online, the narrow purpose can create issues with banks and insurers.

A common mistake is leaving Article 4 blank, which causes rejection because the field is required by statute. Another mistake is mixing personal and business purposes in one sentence, which can pierce the liability veil under common-law alter-ego doctrine.

A misconception is that the purpose locks in your tax classification. It does not, tax classification (disregarded entity, partnership, S-corp, or C-corp) is chosen separately on IRS Form 8832 or Form 2553.

Article 5: Duration

This field asks how long the LLC will exist.

Check the box for “perpetual” unless you have a specific reason to set an end date, such as a single-project joint venture or an estate-planning trust LLC. Perpetual is the standard answer for nearly every operating business.

For example, Marcus checks the perpetual box for his restaurant LLC because he plans to operate indefinitely.

A nuance is that a fixed-duration LLC automatically dissolves on the chosen date under 805 ILCS 180/35-1, even if the members forget. Reviving a dissolved LLC requires Form LLC-35.40 and additional fees.

The most common mistake is accidentally checking a duration date instead of perpetual, which can cause unexpected dissolution years later. A second mistake is leaving both options blank, which the agency interprets as a defective filing.

A misconception is that perpetual duration means the LLC cannot be dissolved. It can be dissolved voluntarily at any time by filing Form LLC-35.15 Statement of Termination.

Article 6: Principal Place of Business

This field asks where the LLC primarily conducts business.

Write the full street address, city, state, and ZIP code. Unlike Article 3, this address can be outside Illinois, and it can be the same as the registered office if you actually work from that location.

For example, Janet writes 200 E RANDOLPH ST, SUITE 5100, CHICAGO, IL 60601 as the principal office for her consulting LLC.

A nuance is that home-based businesses can list their home address here, but doing so puts the address in the public business entity database. Many filers use a commercial mail receiving agency or virtual office to preserve privacy.

The common mistake is leaving this blank for an online business, the field is mandatory, and a blank entry triggers rejection. Another mistake is listing a P.O. box without a physical address, which the IRS will reject when you apply for an EIN.

A misconception is that the principal place of business controls state income tax. Illinois LLC taxation depends on where income is earned and where members reside, not on Article 6.

Article 7: Management Structure

This field asks whether the LLC is run by its members or by appointed managers.

Check exactly one box: “The management of the LLC is vested in the managers” or “The management of the LLC is vested in the members.” Member-managed is the default for small businesses where every owner participates in operations. Manager-managed is used when some owners are passive investors.

For example, the tech startup founders Priya and Devon check managers because their seed investor does not want to be involved in day-to-day operations.

A nuance is that manager-managed status triggers different default voting rules under 805 ILCS 180/15-1 and changes who has apparent authority to bind the LLC.

The most common mistake is checking both boxes, which is contradictory and causes rejection. Another mistake is choosing manager-managed without then naming a manager, which leaves the LLC without anyone with authority on day one.

A misconception is that the management box can be changed informally later. To change the structure, you must file Form LLC-5.25 Articles of Amendment and pay $50.

Article 8: Names and Business Addresses of Initial Managers or Members

This field asks for the people who will run the LLC.

List the full legal name and business address of each manager (if manager-managed) or each member (if member-managed). Use a separate attachment if more than two people need to be listed.

For example, the husband-and-wife restaurant lists MARCUS COLE, 18 S WASHINGTON ST, NAPERVILLE, IL 60540 and RACHEL COLE, 18 S WASHINGTON ST, NAPERVILLE, IL 60540.

A nuance is that listing every member publicly may be undesirable for privacy. Some Illinois LLCs designate just one manager and keep members private, which is permitted under 805 ILCS 180/5-5(a)(7).

The common mistake is listing nicknames instead of legal names, which creates a mismatch with tax records and banking documents. Another is forgetting to update this list when members change, which requires an annual report update under Form LLC-50.1.

A misconception is that the people listed here automatically own the LLC. Ownership percentages are set in the operating agreement, not in Article 8.

Article 9: Other Provisions (Optional)

This field allows you to add custom provisions that are not in the standard articles.

Most filers leave Article 9 blank because operating agreements are the right place for custom rules. Use it only if you need a provision that must be in the public articles, such as a statement that the LLC is professional, low-profit (L3C), or a Series LLC parent.

For example, Priya writes This Limited Liability Company is a Series LLC under 805 ILCS 180/37-40 on the Series version of the form.

A nuance is that anything in Article 9 becomes a matter of public record forever and is harder to change than operating-agreement terms.

The common mistake is dumping the entire operating agreement into Article 9, which creates a public document and inflates the filing fee if pages exceed the standard limit. Another mistake is using Article 9 to restrict member rights in ways that conflict with mandatory provisions of the LLC Act.

A misconception is that Article 9 is required. It is purely optional, and most LLCs leave it blank.

Organizer Signature Block

This field asks for the signature of at least one organizer who is creating the LLC.

Sign your name in ink on paper filings, or type your name on the online portal where the system uses an electronic signature under the Illinois Uniform Electronic Transactions Act, 815 ILCS 333/. Print the organizer’s name and address below the signature.

For example, Carlos signs CARLOS RAMIREZ and prints 742 W ADAMS ST, CHICAGO, IL 60661 below.

A nuance is that the organizer is not the same as a member. A lawyer, paralegal, or formation service can sign as organizer on behalf of the client.

The most common mistake is an unsigned form, which is the single most frequent rejection reason according to the Secretary of State’s published rejection log. Another is signing with initials only, which the agency treats as defective.

A misconception is that all members must sign. Only the organizer signs LLC-5.5, members sign the operating agreement separately.

Three Filled-Out Examples Using Real Scenarios

These three named examples cover the most common Illinois LLC fact patterns.

Example 1: Maria Lopez, Single-Member Design LLC

Form Section What Maria Enters
Article 1 (Name) LOPEZ CREATIVE STUDIO LLC
Article 2 (Effective Date) Date of filing
Article 3 (Registered Agent / Office) MARIA LOPEZ, 1245 N MILWAUKEE AVE, CHICAGO, COOK COUNTY, IL 60622
Article 4 (Purpose) Any or all lawful businesses
Article 5 (Duration) Perpetual
Article 6 (Principal Office) 1245 N MILWAUKEE AVE, CHICAGO, IL 60622
Article 7 (Management) Members
Article 8 (Members) MARIA LOPEZ, 1245 N MILWAUKEE AVE, CHICAGO, IL 60622
Organizer Signature MARIA LOPEZ

Example 2: Marcus and Rachel Cole, Family Restaurant LLC

Form Section What the Coles Enter
Article 1 (Name) COLE FAMILY KITCHEN LLC
Article 2 (Effective Date) 01/01/2026
Article 3 (Registered Agent / Office) MARCUS COLE, 18 S WASHINGTON ST, NAPERVILLE, DUPAGE COUNTY, IL 60540
Article 4 (Purpose) Operation of a restaurant and catering business
Article 5 (Duration) Perpetual
Article 6 (Principal Office) 18 S WASHINGTON ST, NAPERVILLE, IL 60540
Article 7 (Management) Members
Article 8 (Members) MARCUS COLE and RACHEL COLE, 18 S WASHINGTON ST, NAPERVILLE, IL 60540
Organizer Signature MARCUS COLE

Example 3: Priya Shah and Devon Park, Manager-Managed Tech Startup

Form Section What Priya and Devon Enter
Article 1 (Name) NORTHLOOP LABS LLC
Article 2 (Effective Date) Date of filing
Article 3 (Registered Agent / Office) ILLINOIS REGISTERED AGENT INC, 901 S 2ND ST, SPRINGFIELD, SANGAMON COUNTY, IL 62704
Article 4 (Purpose) Any or all lawful businesses, including software development
Article 5 (Duration) Perpetual
Article 6 (Principal Office) 222 W MERCHANDISE MART PLAZA, SUITE 1212, CHICAGO, IL 60654
Article 7 (Management) Managers
Article 8 (Managers) PRIYA SHAH and DEVON PARK, 222 W MERCHANDISE MART PLAZA, CHICAGO, IL 60654
Organizer Signature PRIYA SHAH

How to File the Completed Form

Illinois accepts LLC-5.5 through three official channels, and the channel you pick controls speed, fees, and proof-of-filing.

The fastest and cheapest channel is online through the Illinois Secretary of State Business Services portal. The fee is $150 for a standard domestic LLC and $400 for a Series LLC under 805 ILCS 180/50-10. The portal accepts Visa, Mastercard, Discover, and American Express. Online filings typically process in 10 business days standard, or 24 hours with the $100 expedited add-on. Your proof of filing is the stamped PDF the portal emails you when the filing is accepted. Save that PDF, banks will demand it before opening a business account.

To file by mail, print the completed LLC-5.5 PDF in duplicate and mail both copies with a check or money order payable to “Secretary of State” to: Department of Business Services, Limited Liability Division, 501 S. Second St., Room 351, Springfield, IL 62756. Mail filings take about four weeks, and the agency returns one stamped copy as your proof of filing. Mail filings do not get email notifications, so wait for the stamped copy by mail.

You may also walk the form in personally to the Howlett Building, 501 S. Second St., Room 351, Springfield, IL 62756 or the James R. Thompson Center, 69 W. Washington St., Suite 1200, Chicago, IL 60602. Counter filings can be expedited for the $100 fee and processed while you wait. The clerk hands you a stamped copy on the spot, which is the fastest proof of filing available.

Whichever channel you choose, you must also separately apply for an IRS EIN and register with the Illinois Department of Revenue through MyTax Illinois if you will have employees, collect sales tax, or elect S-corp status.

What Happens After You File

Once the Secretary of State stamps your form as accepted, you receive a Certificate of Organization and your LLC legally exists. The certificate is what banks, landlords, and the IRS will ask for when you open accounts, sign leases, or apply for an EIN. Keep the original in a fireproof place.

The clock now starts on several follow-up obligations. You must file your first annual report on Form LLC-50.1 by the first day of the LLC’s anniversary month every year under 805 ILCS 180/50-1. The annual report fee is $75, and missing it triggers a $100 penalty plus possible administrative dissolution after 180 days.

You should also draft an operating agreement, even though Illinois does not file it publicly. Without one, the default rules of the LLC Act apply, which usually do not match what the owners actually want. Banks will often ask to see the operating agreement before opening a business account.

If you elected a delayed effective date in Article 2, do not sign contracts in the LLC’s name until that date arrives. Contracts signed during the gap bind the organizer personally under common-law agency rules.

Mistakes to Avoid When Filling Out the Form

  • Using a P.O. box as the registered office — the filing is rejected because 805 ILCS 180/1-35 requires a physical street address.
  • Omitting the LLC designator in the name — the agency rejects the name and forfeits the fee.
  • Picking a name that conflicts with an existing entity — the filing fails and the name search must be redone.
  • Naming a registered agent without consent — the agent can resign, leaving the LLC without anyone to accept service.
  • Checking both management boxes in Article 7 — contradictory entries cause rejection.
  • Leaving Article 4 (purpose) blank — Illinois requires a stated purpose under 805 ILCS 180/5-5.
  • Setting a fixed duration by accident — the LLC auto-dissolves and you lose liability protection going forward.
  • Failing to sign the organizer block — the single most common reason for rejection in the Secretary of State’s published statistics.
  • Filing the wrong form for a Series LLC — must use LLC-5.5(S), not the standard LLC-5.5.
  • Forgetting to file the first annual report — leads to administrative dissolution under 805 ILCS 180/35-25, wiping out liability protection retroactively to the dissolution date.
  • Listing a fake or unreachable registered agent address — service of process by publication leads to default judgments.

Do’s and Don’ts

Do’s

  • Do run the Illinois business name search before drafting, because name conflicts cause non-refundable rejections.
  • Do use a commercial registered agent if you work from home, because the registered office becomes public record.
  • Do choose perpetual duration unless you have a specific reason, because fixed durations cause silent dissolution.
  • Do save the stamped Certificate of Organization in two places, because banks and lenders will demand it.
  • Do file online through the Business Services portal for the fastest turnaround.
  • Do draft an operating agreement immediately after formation, because default rules rarely match owner intent.

Don’ts

  • Don’t use a P.O. box anywhere in Article 3, because the filing is rejected automatically.
  • Don’t sign contracts in the LLC’s name before the effective date, because they bind you personally.
  • Don’t list nicknames in Article 8, because tax and banking records demand legal names.
  • Don’t pay extra for “premium” formation services that just refile the same form, because the work is identical.
  • Don’t forget the annual report, because administrative dissolution under 805 ILCS 180/35-25 is painful to reverse.
  • Don’t paste your operating agreement into Article 9, because public disclosure cannot be undone.

Pros and Cons of Filing on Your Own vs. With Help

Pros of Filing Yourself

  • You save $200 to $800 in formation-service fees, money better spent on an operating agreement.
  • You learn the structure of the Illinois LLC Act, which helps later compliance.
  • You control the timeline, which matters if you must form before a contract closes.
  • You avoid third-party data-sharing risks.
  • You can use the same skills to file amendments and annual reports later.

Cons of Filing Yourself

  • You miss subtle issues like Series LLC vs. standard LLC under 805 ILCS 180/37-40.
  • You bear the cost of any rejection, the fee is not refunded.
  • You may pick the wrong management structure for your investor situation.
  • You do not get an operating agreement; the form does not create one.
  • You may miss tax-election deadlines that should run alongside formation, such as the 75-day S-corp election under IRS Form 2553.

FAQs

Is Illinois Form LLC-5.5 the same as a corporation filing?

No. LLC-5.5 forms a limited liability company under 805 ILCS 180/. Corporations file Form BCA-2.10 under a separate statute and have shareholders, directors, and officers instead of members.

Can I use a P.O. box for the registered office in Article 3?

No. Illinois law requires a physical street address inside the state. A P.O. box causes automatic rejection and forfeiture of the filing fee.

Do I need an attorney to file LLC-5.5?

No. Most filers complete the form on their own through the online portal. An attorney helps when there are multiple members, outside investors, or a Series LLC structure.

Can I list myself as the registered agent?

Yes. Any Illinois resident over 18 with a physical Illinois address can serve as registered agent, including the owner.

Do I write my full legal name or business name in Article 8?

Yes, use your full legal name if you are the member, not a nickname or DBA. Tax and banking systems cross-check against IRS records.

Should I check “members” or “managers” in Article 7?

Yes, check members if every owner runs the business, or managers if some owners are passive investors. The choice controls who can bind the LLC.

Can I leave Article 9 (Other Provisions) blank?

Yes. Article 9 is optional and most LLCs leave it blank. Use the operating agreement for custom rules instead.

Is the $150 filing fee refundable if my form is rejected?

No. The Secretary of State does not refund filing fees for rejected articles. You must refile and pay again.

Do I need to file an annual report after LLC-5.5?

Yes. File Form LLC-50.1 every year by the first day of your anniversary month, with a $75 fee, or face administrative dissolution.

Can I form a Series LLC using the standard LLC-5.5?

No. Series LLCs require Form LLC-5.5(S) and a $400 fee under 805 ILCS 180/37-40.

Does LLC-5.5 give me an EIN automatically?

No. The EIN is issued separately by the IRS through the online EIN application, and you must apply after the LLC exists.

Can I change the registered agent later without filing a new LLC-5.5?

Yes. File Form LLC-1.36/1.37 Statement of Change of Registered Agent and pay a $25 fee. You do not refile LLC-5.5.

Do all members have to sign Form LLC-5.5?

No. Only the organizer signs. Members sign the operating agreement, which is a separate, private document not filed with the state.

Can I file LLC-5.5 if I live outside Illinois?

Yes. Members and organizers can live anywhere. Only the registered agent must have an Illinois street address.