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To form an LLC in Illinois, choose an available business name, appoint a registered agent with a physical Illinois address, and file your Articles of Organization with the Illinois Secretary of State along with the $150 state filing fee. Below is a detailed breakdown of each step, covering every requirement you need to know to form your Illinois LLC correctly and confidently.
Illinois compares a proposed name with every active entity on file and rejects any that are too close to an existing one. The bar for "different enough" is stricter than most new owners expect.
If you are searching “What are the rules for naming an LLC in Illinois?”, here’s what you need to know:
Designator required: The name must end in "L.L.C.," "LLC," or "Limited Liability Company." Illinois does not accept "Ltd." or "Co." as a substitute for the full designator.
Distinguishable, not just different-looking: Punctuation changes, an added "The," or a different word order usually will not clear the availability check on their own.
Restricted terms need sign-off: Words like "bank," "trust," or "university" require supporting documentation or a licensed professional’s involvement before Illinois will approve them.
Allowed Characters: Limited mostly to English letters, Arabic numerals (0-9), and standard punctuation/Roman numerals.
Once you finalize your Illinois LLC name following these rules, check current records via the Illinois Secretary of State Corporate (Business Search) to confirm nobody else has your name. If it’s taken, use Swyft Filings free business name generator to explore other options that suit your preferences.
Every Illinois LLC must appoint and continuously maintain a registered agent and registered office at a fixed Illinois address that accepts legal notices and state correspondence during normal business hours. Your Illinois registered agent serves as your LLC’s official point of contact for receiving legal documents, service of process, and official correspondence from the Illinois Secretary of State. That requirement doesn’t shrink for a single-member LLC. Whether the LLC has one owner or ten, the state still needs a name and address it can reach.
Your registered agent can be:
A business entity authorized to transact business in Illinois.
In certain circumstances, an LLC member, manager, organizer, or employee who meets the state's requirements can serve as the agent.
The registered office must be located in Illinois and have a physical street or road address. A P.O. Box alone cannot be used, and the registered office address must be the same as the registered agent's business office address.
NOTE: If the registered agent ever changes, Illinois requires filing an update rather than letting the record go stale.
This is the filing that legally creates the LLC in Illinois. Process it either online through the Secretary of State’s business services system or by mailing a paper Form LLC-5.5.
Base filing fee: $150, whether filed online or by mail.
Standard processing: generally 5 to 7 business days once the state receives the filing.
Expedited option: paying an additional $100 typically moves processing down to about 24 hours.
The Articles of Organization ask for:
LLC name, matching the naming rules above.
Registered agent name and address, the Illinois address covered in the previous section.
Principal office address, which can be in or out of state.
Effective date, immediately upon filing, or a specific later date up to 60 days out.
Organizer signature, from whoever is submitting the filing.
You can start an LLC online in Illinois through the Secretary of State’s business services portal in one sitting, which is why most filers choose it over mailing a paper form.
Once Illinois approves the LLC, the next step is a federal Employer Identification Number. Banks require it to open an account, and it’s necessary before hiring anyone or filing most federal returns. It’s free no matter how you apply for an EIN.
Business owners who don’t have a Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN) can still apply for an EIN. On Form SS-4, leave the SSN/ITIN field blank and enter “Foreign/Non-Resident” where applicable. You can then submit the form by mail or fax to the IRS’s designated unit, or contact the IRS international line if you are eligible to request your EIN by phone.
Illinois law doesn’t require an LLC to have a written operating agreement, and nothing gets filed with the state. Without one, though, the default provisions in the Illinois LLC Act fill the gaps, and those defaults are generic by design; they won’t reflect what a specific group of owners actually agreed to. A working Illinois LLC operating agreement typically covers:
Ownership and contributions, who owns what percentage, and what each member put in to get there.
Management structure, member-managed or manager-managed, and who can sign on the LLC’s behalf.
Voting and decision-making, what threshold major decisions need, and how ties get resolved.
Profit and loss distribution, how and when money actually moves to owners.
Changes in membership, how a new member gets admitted, or how a departing member’s interest is handled.
Keep the signed Illinois LLC Operating Agreement with your internal business records for future reference. If you’d rather not draft one yourself, Swyft Filings can help you create a custom LLC Operating Agreement by having you complete a short questionnaire tailored to your business.
Choose a member-managed Illinois LLC if all or most owners will actively participate in running the business and making day-to-day decisions. This structure is often suitable for small businesses where the members want direct control over operations.
On the other hand, a manager-managed Illinois LLC may be a better fit if you want to appoint one or more managers to handle daily operations while other members remain less involved or act primarily as investors. Managers can be members or other individuals you designate to manage the Illinois LLC. The right choice depends on your ownership structure, how involved each member will be, and how you want business decisions to be made.
If your Illinois LLC will sell taxable goods, run payroll, or owe another state business tax, registration happens with the Illinois Department of Revenue, most commonly through the REG-1 application filed via MyTax Illinois, which the department processes in 1 to 2 business days online versus 4 to 6 weeks for a mailed paper form.
Illinois taxes LLCs a little differently than most states. Multi-member Illinois LLCs taxed as partnerships owe a 1.5% Personal Property Replacement Tax (PPRT) on top of any member-level taxes, a tax most other states don’t have. LLCs that elect corporate tax treatment pay a 2.5% PPRT rate instead, plus the state’s 7% corporate income tax. A single-member Illinois LLC taxed as a disregarded entity generally isn’t subject to the PPRT.
Beyond PPRT, here’s how Illinois usually taxes an LLC’s income:
Single-member LLC: disregarded for tax purposes; income is reported on the owner’s personal return.
Multi-member LLC: taxed as a partnership by default. Illinois also allows multi-member LLCs to elect a Pass-Through Entity Tax of 4.95%, paid at the entity level rather than by each member individually.
Individual income tax rate: a flat 4.95%, regardless of how much the owner earns.
Sales tax: 6.25% at the state level, with local additions pushing the combined average to 8.8%-8.9%, depending on where the business operates.
Forming the LLC doesn’t clear it to operate. Illinois splits licensing across several layers, and there isn’t one office that covers all of them, though the state’s own step-by-step guidance is a reasonable place to start sorting out which layer applies.
Regulated professions, such as cosmetology, real estate, and healthcare, are regulated by the Illinois Department of Financial and Professional Regulation.
Sales and use tax accounts, for anyone selling taxable goods, are set up through the same MyTax Illinois registration covered above.
City and county permits vary widely; Chicago in particular layers its own business license requirements on top of state ones.
If the LLC operates specifically in Chicago, most business activity there requires a separate city license through the Department of Business Affairs and Consumer Protection, in addition to whatever the state requires. BACP’s license-type guide is the fastest way to confirm whether a specific business activity is covered, since Chicago’s list of exemptions and required license types doesn’t map cleanly onto the state’s.
Swyft Filings’ Business License Research service takes the guesswork out of the process. Our team researches the federal, state, and local requirements that may apply to your business and provides a customized report with verified licensing information, direct application links, and renewal requirements.
Illinois LLCs file an annual report every year, not every few years, and the deadline is tied to the month the LLC was originally formed rather than a fixed calendar date.
Due date: Any time before the first day of the Illinois LLC’s anniversary month, with a filing window that opens 60 days ahead of that date.
Missing it: Triggers a $100 penalty if it isn’t filed by the start of the second month after the anniversary month, and the penalty compounds for each additional year it remains unfiled.
Staying unfiled long enough: Gives the Secretary of State grounds to administratively dissolve the LLC, so it’s worth treating the anniversary date the same way you’d treat a tax deadline.
Because the due date moves with each Illinois LLC’s formation date rather than being a single fixed day, as some states use, it’s easy to lose track of. A calendar reminder set right after formation is the simplest fix.
If the Illinois LLC was administratively dissolved for failing to file an annual report, Illinois allows reinstatement rather than starting over. That means filing an Application for Reinstatement (Form LLC-35.40) with the Secretary of State, along with any missed annual reports and the penalties attached to each. The reinstatement filing itself typically costs a few hundred dollars on top of any accumulated back fees, so the total cost climbs the longer an Illinois LLC remains dissolved. If someone else claimed the LLC’s name in the meantime, reinstatement also requires picking a new one.
Opening a separate business bank account is an important step after forming your Illinois LLC. It helps keep your business and personal finances separate, making it easier to manage expenses, maintain accurate records, and prepare for taxes. Banks may ask for your Articles of Organization, EIN, Operating Agreement, business information, and government-issued identification when you apply. To know "How to Open a Business Bank Account in 2026, read this blog.
How Much Does Starting an LLC in Illinois Cost?
| Filing | Cost |
|---|---|
| Articles of Organization (Form LLC-5.5) | $150 |
| Name reservation (90 days, optional) | $25 |
| Foreign LLC registration (Form LLC-45.5) | $150 |
| Late Annual Report penalty | $100, compounding per year unfiled |
| Reinstatement after administrative dissolution (Form LLC-35.40) | Roughly $200, plus every missed annual report and penalty |
Forming an Illinois LLC yourself is possible, but you’ll need to handle the formation paperwork, registered agent requirements, annual reports, and other compliance tasks on your own. Here’s how the DIY approach compares with using Swyft Filings:
| Requirement | DIY | With Swyft Filings |
|---|---|---|
| Illinois LLC Formation | Prepare and file Form LLC-5.5, Articles of Organization, with the Illinois Secretary of State yourself. | Swyft Filings prepares and files your formation documents on your behalf. |
| Illinois LLC Operating Agreement | Draft your own agreement or use a free operating agreement template. | Get help creating a customized LLC Operating Agreement. |
| Illinois Registered Agent | Choose and maintain an Illinois registered agent who meets state requirements. | Professional registered agent service is available. |
| Attorney Access | Find and hire an attorney separately if you need legal guidance. | Personalized guidance from a business attorney is available. |
| Domain Name + Website | Find, purchase, and manage your own domain and website. | Done-for-you website and domain included through partner UENI. |
| Illinois Business License Research | Research state, county, and local licenses and permits yourself. | Business License Research service is available as an add-on. |
| Illinois DBA Filing | File an assumed name with the appropriate county or state office, depending on your business structure. | DBA filing service is available as an add-on. |
| Document Storage | Organize and store your LLC documents yourself. | Secure online Document Vault provides 24/7 access to your business documents. |
| Illinois Compliance Management | Illinois LLCs must file an annual report and pay the applicable fee. | Compliance support is available through ComplianceGuard. |
| Tax Consultation | Find and hire a tax professional separately. | Free 30-minute tax consultation included through partner 1-800Accountant. |
| Support | Handle filing questions yourself or contact the Illinois Secretary of State. | Lifetime customer support is available. |
Don’t let filing requirements slow down your formation of an Illinois LLC. With Swyft Filings, you can get help with formation documents through our Basic LLC Formation Package for $0 + the $150 state fee. Spend less time figuring out paperwork and more time building your business.
$0 + State Filing Fees
*Disclaimer: This guide provides general information about forming an LLC in Illinois and is not a substitute for legal, tax, or financial advice.*
LLC rules, fees, and processing times vary by state. Select a state below to check its specific costs and filing requirements.