Part of our guide to the registered agent service in Illinois. More guides on this topic
An LLC does one thing that matters more than all the rest: it puts a legal wall between your business and everything you own personally.
If the business is sued or takes on debt, your house, your car and your savings sit on the other side of that wall. That is the whole reason to file, and everything below is the mechanics of doing it properly in Illinois.
What an LLC actually gives you
Liability protection. Your personal assets are generally out of reach of business creditors and lawsuits. This protection is real, but it is conditional. Mix your business and personal money and a court can disregard it entirely. More on that below, because it is the mistake that undoes everything.
Tax flexibility. By default an LLC is a pass-through entity: the business pays no income tax itself, and profits and losses land on the owners' personal returns. That avoids the double taxation a C corporation faces. As profits grow you can elect S corporation treatment, which can reduce self-employment tax. That is a conversation worth having with a CPA once the numbers are meaningful.
Credibility. "Smith Design LLC" reads differently from "John Smith" on a contract, an invoice, or a vendor application. Some clients will not open an account with a sole proprietor at all.
If you are weighing that simpler structure against shares, a board, and investor ownership, read how to form a corporation in Illinois before you choose.
The four steps
Step 1: Name it and check it is free
Your name has to be unique among Illinois entities, and it must end with "Limited Liability Company," "LLC" or "L.L.C." That suffix is not optional.
Search before you get attached to anything. The state's business entity search is free and takes seconds, and the useful trick is to search by keyword rather than your exact name: Illinois only counts names as different when they are distinguishable by sight, so a comma, a plural or a different suffix will not save you. Our guide to the Illinois business search covers how to read what comes back, including the three-year hold on dissolved companies' names that surprises people. While you are there, check whether the matching .com is available. Discovering later that your legal name and your domain cannot match is an avoidable annoyance.
If you are not ready to file yet, you can reserve a name with the state for $25, which holds it for 90 days.
Step 2: Appoint a registered agent
Every Illinois LLC must have one. A registered agent is the person or company designated to receive legal documents (lawsuits, state notices, service of process) on the company's behalf.
The requirements are specific: a physical Illinois street address, no PO Boxes, available during normal business hours.
You can name yourself. Most founders should not, for three reasons:
- Your address goes on the public record, permanently.
- Process serving happens wherever you listed: potentially your home, potentially in front of a client.
- You have to actually be there during business hours. A missed service of process can mean a default judgment against your business.
A commercial service solves all three. Ours is $95 a year per entity, which is at the low end of the market. Typical services run $100 to $300, and some national providers charge considerably more after the first year.
Step 3: File your Articles of Organization
This is the filing that creates your LLC. It goes to the Illinois Secretary of State on Form LLC-5.5, and the state's own LLC filing instructions are clearer than most articles about them. The form asks for:
- Your LLC name, with the correct suffix
- The principal business address
- Your registered agent's name and Illinois street address
- The members or managers
- Your business purpose, which can usually be stated generally
The Illinois filing fee is $150 for a standard LLC. A series LLC is $400. Online filing is faster than paper.
The two errors that get applications rejected are a typo in the registered agent's address and a missing "LLC" in the business name. Both mean re-filing and re-paying. Read it twice.
Step 4: Get your EIN
An Employer Identification Number is your business's equivalent of a Social Security number. You need one to open a business bank account, hire anyone, file federal returns, and apply for most licenses and permits.
Apply directly with the IRS. It is free, online, and issues the number the moment you finish. Four things about the application that catch people:
- It runs weekday hours only, and the session cannot be saved. Set aside fifteen uninterrupted minutes, because an idle session expires and you start over.
- The responsible party, the human whose name attaches to the number, needs a Social Security number or ITIN to apply online.
- The IRS issues one EIN per responsible party per day. Forming two companies this week means two sittings.
- The confirmation letter the system produces at the end, called a CP 575, is issued exactly once, and it is the document your bank will ask to see when you open the account. Save the PDF the moment it appears. If you ever lose it, the replacement is a 147C verification letter, requested by phone, because the IRS never reprints the original.
Be aware that services charge for this. Paying $80 for something the IRS gives away in ten minutes is the most common unnecessary cost in the whole process. Everything above, and every edge case, lives on the IRS's own EIN page.
What it costs in Illinois
| Item | Cost | Notes |
|---|---|---|
| Articles of Organization | $150 | Form LLC-5.5; $400 for a series LLC |
| Registered agent | $95–$300/year | Recurring. Ours is $95 a year per entity |
| Annual report | $75/year | Due before the first day of your anniversary month, every year |
| Late annual report penalty | Commonly $100 | Attaches from the first day of the second month after your anniversary month |
| Name reservation | $25 | Optional, holds the name 90 days |
| EIN | $0 | Free from the IRS |
| City business license | Varies by category | See the Chicago section below |
Why this matters: the $75 annual report is the fee founders forget. It is due before the first day of your anniversary month, the month the state approved your LLC, every year regardless of whether the business traded. File later than the first day of the second month after that and a late penalty attaches, commonly quoted at $100. Left long enough, the state administratively dissolves your LLC, and the liability protection you paid for stops existing. Put the deadline in a calendar the day you form, and read our Illinois annual report guide once, because the deadline math has a January trap in it.
The Chicago licensing part
Forming the LLC and licensing the business are two different governments, and finishing the first does not start the second. The LLC is state-level paperwork with the Secretary of State. The license is city-level, and most businesses operating in Chicago need one from the Department of Business Affairs and Consumer Protection, where the category and the cost depend on what you actually do. Ordinary office-type work generally falls under the Limited Business License; inspected activity like food is a different world.
For city requirements, confirm the premises and documents your activity needs directly with the City of Chicago before filing.
After the filing: what actually protects you
Getting approved is the start, not the finish. Three habits determine whether your liability shield survives contact with a real dispute.
Write an operating agreement
Illinois does not require one. Skip it anyway and you are relying on default state rules and everyone's memory of a conversation.
An operating agreement sets out:
- Ownership and contributions: who owns what percentage, and what each member contributed in money, property or work
- Roles and decision-making: who runs day-to-day operations, who signs off on what
- Profit distribution: how money is split
- Exit terms: what happens when someone wants out, becomes unable to work, or dies
Multi-member LLCs formed on a handshake tend to be fine right up until there is money or a disagreement worth arguing about. The document is cheap now and impossible to negotiate fairly later.
Open a business bank account immediately
This is the single most important operational step, and it is not optional.
Mixing business and personal money (commingling) gives a court grounds to "pierce the corporate veil," which means disregarding the LLC entirely and treating its debts as yours personally. Every reason you formed the LLC evaporates at that point.
All business income and expenses run through business accounts. No exceptions, from day one, regardless of how small the numbers are.
Understand how you are taxed
How an LLC is taxed is a choice with a default, and the IRS's own LLC page is the primary source on it.
Single-member LLC. The IRS treats you as a sole proprietor by default. Business income and expenses go on Schedule C with your personal 1040.
Multi-member LLC. Treated as a partnership. The LLC files an informational return (Form 1065) and each member receives a Schedule K-1 for their share.
Electing S corp. Once profits are substantial, electing S corporation treatment lets you pay yourself a reasonable salary and take the remainder as distributions, which are not subject to self-employment tax. The election itself is Form 2553, due within two months and fifteen days of the start of the tax year you want it to apply to, which is why the S corp conversation happens early in the year, not at tax time. Worth modeling with a CPA rather than guessing.
You pay yourself through an owner's draw (a transfer from the business account to your personal one), not a W-2 paycheck, unless you have elected S corp treatment.
The federal report that keeps changing
You may read elsewhere that every new LLC must file a beneficial ownership report with FinCEN. As of this writing that is out of date: FinCEN's 2025 rule change removed the requirement for companies formed in the United States, leaving it mainly for foreign entities registered to do business here. This rule has reversed direction more than once, so spend five minutes on FinCEN's own BOI page the week you form, and trust it over any article, including this one.
The address decision you make once
The address on your Articles of Organization becomes public record. Anyone can search it. Changing it later means filing an amendment.
If you use your home, that is your home address published permanently, and it is where a process server will come. Our form-by-form address privacy walkthrough shows how to keep it off each public address line. For most people working from home, a commercial address is the cleaner answer, and Illinois requires a street address for both the company and the registered agent anyway.
A virtual office gives you a real Chicago street address at 1655 S Blue Island Ave with a signed agreement documenting your right to use the address: $75 a month plus a $95 one-time setup. Add our $95-a-year registered agent service and both requirements are handled at one address, by people you can call.
For the detail on what an address must do to hold up, see our guide to virtual business addresses in Chicago.
Frequently asked questions
How much does it cost to form an LLC in Illinois?
$150 to file the Articles of Organization, plus $75 every year for the annual report. Add a registered agent, typically $95 to $300 a year depending on provider; ours is $95 a year per entity. Add any industry licenses. The EIN is free from the IRS. A realistic first-year total for a simple LLC is roughly $230 to $400 before licenses.
Do I need a lawyer to form an LLC?
For a straightforward business, no. Illinois has made the process manageable directly or through a formation service. A lawyer is worth it when there are multiple investors, an unusual ownership split, or a heavily regulated industry such as finance or healthcare.
Can I use my home address for my Illinois LLC?
Legally yes, practically it is a poor choice. The address becomes public record and it is where legal documents get served. A commercial address keeps your home private and satisfies the state's street-address requirement at the same time.
What is the difference between an LLC and a sole proprietorship?
Liability. A sole proprietor and their business are the same legal entity, so business debts and lawsuits reach personal assets. An LLC is a separate entity, which is what creates the protection.
How do I pay myself from an LLC?
Through an owner's draw: a transfer from the business account to your personal account. You pay self-employment tax on the LLC's profits via your personal return. If you elect S corp treatment, you pay yourself a reasonable salary instead and take remaining profit as distributions.
Do I have to file an Illinois annual report?
Yes, every year, even if the LLC did no business. It costs $75 and is due before the first day of your anniversary month, which is the month the state approved your LLC. File later than the first day of the second month after that and a late penalty attaches, commonly quoted at $100. Left long enough, the state can administratively dissolve your LLC.
Can I be my own registered agent in Illinois?
You can, provided you have a physical Illinois street address (not a PO Box) and are available during business hours. The trade-offs are that your address becomes public, and you must reliably be present to accept service of process.
Build it on a foundation that holds
The filing itself is a single afternoon. What determines whether the protection actually works is what you do afterwards: separate accounts, a written agreement, and the annual report filed on time every year.
If you want the address and the registered agent handled together at a real Chicago building, compare our plans or talk to our team. If all you need is a mailbox, we will point you there instead.
