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Form a C Corporation in Illinois for Free

To form a C Corporation in Illinois, you file Articles of Incorporation (Form BCA 2.10) with the Illinois Secretary of State. Swyft Filings prepares and submits that paperwork at $0 service fee; you only pay the $150 filing fee. Upgrade to a paid package, and we'll also draft your bylaws, set up your stock authorization, connect you with a business attorney for consultation, and provide a registered agent as an add-on.

Illinois C Corp Formation Packages

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How to Start a C Corp in Illinois in 7 Steps

Getting an Illinois C Corp starts with choosing a name that clears the state's database, and then appointing a registered agent who can legally accept mail on the company's behalf. From there, you'll decide your share structure, submit your Articles of Incorporation, and put corporate bylaws in writing, run your first organizational meeting, and finish by getting an EIN from the IRS.

If you don’t feel comfortable handling all the paperwork yourself, Swyft Filings will form your Illinois C Corp for you at no service cost; you only cover the state's fee. Here's the full breakdown of each step.

Step 1: Choose a Business Name for Your Illinois C Corp

The name you pick goes on public record the second your Articles are approved. It's what shows up on your bank paperwork, your contracts, and eventually your storefront or website, so it's worth getting right the first time rather than filing amendments later.

Illinois naming rules for a C Corp:

The name has to read as distinct from every other business currently on file with the Illinois Secretary of State, not just similar-sounding
The name has to end with a corporate suffix, such as "Corporation," "Incorporated," "Company," or "Limited," or a shortened version such as "Corp." or "Inc."
It can't use a language that belongs to a different entity type, so no "LLC" or "Limited Liability Company" in a corporation's name
Words like "Trust," "Trustee," or "Fiduciary" are off-limits unless the corporation is actually licensed to act as one

If you are still stuck on choosing a name, Swyft Filings' free business name generator can get you a shortlist in a couple of minutes.

Once you've settled on something, search it against the Illinois Secretary of State's business name database before you file. A name that looks available at a glance can still get rejected over a punctuation difference or an abbreviation the system reads as identical, so this step catches problems early instead of after you've paid the filing fee.

Yes. If you are not ready to incorporate immediately, you can reserve your desired business name by filing an Application for Reservation of Name with the Illinois Secretary of State. Paying the $25 state fee holds the name exclusively for 90 days. If you need additional time before filing your Articles of Incorporation, you can submit a new reservation application prior to expiration to extend your hold for another 90 days.

If you want to operate under a name that isn't the one on your Articles of Incorporation, you need to file for an assumed name. Illinois handles this differently for corporations than it does for sole proprietors. Individuals and partnerships file assumed names at the county level with newspaper publication requirements. Corporations skip that entirely and file directly with the Illinois Secretary of State instead.

The fee depends on where you are in a five-year cycle: $150 if you're filing in a year ending in 0 or 5, dropping to $120, $90, $60, or $30 depending on how many years remain before the next renewal cycle. Changing an assumed name later costs $25, and canceling one costs $5.

Illinois law doesn’t mandate a domain name for C Corp formation, but it is important to your brand's online presence. You don’t need to mention your domain name in your filing papers.

Online registrars handle both domain searches and registrations, usually for $10 to $20 per year. If you choose Swyft Filings' Standard or Premium package, your first year of domain registration is included.

Once your Articles of Incorporation are approved and the name is officially yours in Illinois, you have two paths. A state trademark through the Illinois Secretary of State that only protects you within Illinois. If you plan to operate in other states or expect to build a brand people search for nationally, filing a federal trademark through the USPTO costs more upfront but covers all 50 states.

Step 2: Appoint an Illinois Registered Agent

Illinois requires every corporation to keep a registered agent on file at all times. It can be a person or some entity that can legally accept lawsuits, state notices, and other official mail on the company's behalf. This isn't optional paperwork you can leave blank and fill in later. The agent's name and address are a required field on your Articles of Incorporation, so you need this settled before you file.

What Illinois requires of a registered agent:

A real street address inside Illinois; a P.O. box won't satisfy this requirement.
Presence at that address during normal business hours so that documents can be handed over in person, not just left in a mailbox.
If you're naming a business as your agent rather than a person, that business has to already be authorized to operate in Illinois.

Appointing one involves three things: Pick someone who qualifies, get their agreement to take on the role, and list their name and Illinois address in your Articles of Incorporation.

You can, as long as you meet the address and availability rules above. The catch is that your name and address for RA purposes become permanently searchable on the state's public record.

Swyft Filings' registered agent service protects your privacy by putting our physical office address on public record for service of process instead of yours, while securely forwarding all official state mail directly to you.

These sound interchangeable, but they're not. Your registered office is strictly where your registered agent is stationed to receive legal mail, nothing more. Your principal place of business is wherever the corporation actually conducts its day-to-day operations, whether that's an office, a warehouse, or a home office. Many small corporations use the same address for both because it's simpler, but there's no requirement that they match.

You can't file your Articles of Incorporation in the first place without one, so this question mostly comes up after formation, when an agent resigns, moves, or simply stops being reachable. The state usually catches this because mail sent to your registered office bounces back as undelivered. Once that happens, your corporation is out of compliance, and the risk compounds the longer it goes unresolved.

A corporation without a valid registered agent can eventually fall out of good standing with the Secretary of State, which affects your ability to do things like open new bank accounts, get a certificate of good standing for a lender, or defend yourself if you're sued. To fix this, file a change of registered agent as soon as you notice the gap, rather than waiting for a formal notice from the state.

File a Statement of Change of Registered Agent with the Illinois Secretary of State. The fee is $25, and you'll need your corporation's exact name, its file number, and the new agent's name and Illinois street address. This is a separate filing from your annual report, so updating one won’t automatically update the other.

Yes. If your corporation was formed in another state and you're now qualifying to do business in Illinois, you must name an Illinois registered agent. The requirements are the same as those that apply to a corporation formed in Illinois: a physical Illinois address and availability during business hours.

You need to mention an authorized share count on your Articles of Incorporation, which means the ownership decisions have to happen before you file. Getting this right early saves you an amendment later if your structure turns out to be too small for the investors or employees you eventually bring on.

Work through these five decisions in order:

How many total shares you're authorizing
Whether those shares carry a par value or no par value
Whether you're issuing one class of stock or splitting it into multiple classes
How voting power and board appointment rights attach to each class
Getting all of it written down, both on your Articles and in a shareholder agreement

Know the following things for setting up share structure for a Illinois C Corp:

Common stock goes to founders and early team members. This is the default share type, and it's what most people picture when they think of owning part of a company.
Preferred stock is built for investors, not founders. It comes with a payout advantage: if the company is sold or shut down, preferred shareholders get paid out before anyone holding common stock sees a dollar. Outside investors typically won't invest without it.
Splitting stock into classes protects control, not just ownership. A common setup is Class A shares that carry more votes per share than Class B, which lets a founder raise outside money without also handing over a majority say in company decisions. Not every startup needs this on day one, but it's much easier to build in from the start than to restructure after shares are already out the door.
Voting rights and board seats aren't automatic; they're assigned. Just because someone owns shares doesn't mean they automatically get a board seat or a say in every decision. Spell out each share class's voting rights and board seats before issuing stock. Changing these rules later requires renegotiating with existing shareholders.
Transfer restrictions keep your cap table from filling up with strangers. A right of first refusal clause, standard in most shareholder agreements, means a shareholder who wants out has to offer their shares back to the company or the other shareholders before shopping them to an outsider. Without this, a disgruntled early employee could sell their stake to anyone.
Future fundraising changes the math on what you authorize today. If venture capital is part of the plan, think through how a Series A or later round dilutes today's ownership percentages before you lock in your initial authorized share count. Authorizing too few shares now often means an amendment later, right when you're trying to close a round quickly.
Dilution is the tradeoff every new share issuance carries. Every time the corporation issues additional shares, whoever already owns stock ends up owning a smaller slice of the total, unless the shareholder agreement includes a preemptive right or an anti-dilution clause that limits the extent of dilution.
An option pool is how most corporations pay in equity instead of cash. Rather than stretching payroll to compete on salary alone, corporations typically carve out 10% to 20% of authorized shares as an option pool for employees, granting from that pool on the same vesting terms as the founders.
Vesting protects the company if someone leaves early. The standard structure nationwide is four years with a one-year cliff: nobody's shares start vesting until they've been with the company a full year, and after that milestone, vesting continues monthly or quarterly for the remaining three years.
Plan for what happens if a shareholder dies before you need the answer. A buy-sell provision in your shareholder agreement should already say whether the corporation buys back the shares, offers them to the remaining shareholders first, or lets them pass to the deceased shareholder's estate. Deciding this in the moment, during a death in the family, is much harder than deciding it on paper in advance.

How to officially issue stock?

Once you have decided on all the above things in this list, your next steps are:

Issue Stock Certificates: Prepare formal certificates for each initial shareholder.
Update the Stock Ledger: Log every transaction and share distribution in your corporate stock transfer ledger.
Verify Securities Exemptions: Ensure your share offering qualifies for an exemption from SEC registration (usually as a private sale to a small group).
Submit Form D (If Applicable): File Form D with the SEC within 15 days of your first share sale if you are relying on the federal Rule 506(b) exemption.

The shareholder agreement is where all of this lives permanently. Pull all the decisions above into a single document. This becomes the reference your corporation and its shareholders actually turn to when a question comes up later.

Step 4: File Your Illinois Articles of Incorporation

Form BCA 2.10 is the document that legally creates your corporation, filed with the Illinois Secretary of State. The filing fee is $150.

Filing methods:

Online, through the Illinois Secretary of State's online filing portal.

By mail or in person, sending or delivering your completed Form BCA 2.10 to the Illinois Secretary of State, Department of Business Services, 501 S. Second St., Rm. 350, Springfield, IL 62756.

Standard processing by mail generally takes around two weeks. If that's too slow, Illinois offers expedited processing for an additional $100 on top of the base filing fee, not instead of it, which typically brings your turnaround down to about one business day.

What Information Does Illinois Require on Your Articles of Incorporation?

Your corporation's name, matching the naming rules above
Your registered agent's name and Illinois street address
The number of shares you're authorizing
A business purpose statement
Names and addresses for your initial board of directors
Names and addresses for whoever is acting as incorporator

Illinois requires only one director, so a single founder can legally serve as the entire initial board. There's no maximum number, and Illinois doesn't require directors to be Illinois residents or even U.S. citizens. One person can also hold multiple officer titles simultaneously, so a solo founder can be president, secretary, and treasurer all at once if that's how the company is structured early on.

This is a short statement describing what your corporation exists to do. Most founders use a broad, catch-all clause covering any lawful business purpose rather than narrowly describing their current product or service. The advantage is flexibility: if your business pivots six months in, you're not stuck amending your Articles just because your purpose clause described a business you no longer run.

If your corporation was already formed elsewhere and you want to legally do business in Illinois as well, you don't need to refile the Articles of Incorporation. Instead, you submit an application for authority to transact business in Illinois, also called a foreign qualification application. The form needs to include basic information about your business and an Illinois-registered agent.

Step 5: Create Corporate Bylaws

Illinois does not require corporations to file bylaws with the state, but corporations should adopt and maintain bylaws as part of proper corporate governance. You need them written and adopted before your organizational meeting, since adopting the bylaws is typically the very first item on that meeting's agenda.

What your bylaws should spell out:

When, where, and how shareholder and director meetings happen
What counts as a quorum and how voting actually works at those meetings
Director qualifications, how they're compensated, and how long each term lasts
Officer titles, their duties, and their compensation
How the corporation determines who's officially a shareholder of record
The process for amending the bylaws themselves down the road

You can draft these yourself using the list above as a starting checklist, or use Swyft Filings' Corporate Bylaws service. We draft the bylaws around your actual share structure instead of handing you a generic template that doesn't reflect the classes or vesting terms you've already set up.

Yes, and this applies even if you're the only shareholder and the only director. The key distinction is that bylaws are an internal document, meaning you keep them with your corporate records rather than filing them with the Secretary of State. Nobody at the state checks whether you have bylaws when you file your Articles, but not having them creates a real gap if your corporation's legitimacy is ever questioned later, whether by a bank, an investor doing diligence, or a court.

The immediate problem is internal: meetings lack structure, decisions are made informally, and nobody can point to a clear process when a disagreement arises. The bigger problem arises if the corporation is ever sued and a creditor argues that the business wasn't really operating as a separate legal entity from its owners.

Courts call this piercing the corporate veil, and when it succeeds, shareholders can be held personally responsible for the corporation's debts, the exact outcome forming a corporation is supposed to prevent. Maintaining proper corporate formalities, including following bylaws and keeping accurate records, can help demonstrate that the corporation operates separately from its owners.

Yes. Under Illinois law, corporations must hold an annual shareholder meeting unless shareholders take official action by written consent. While missing a single meeting will not automatically dissolve your corporation, a consistent pattern of ignoring corporate formalities can weaken your corporate shield during a lawsuit or liability dispute. For solo founders, signing a brief annual written consent takes minimal time and ensures your personal asset protection remains intact.

Step 6: Hold an Organizational Meeting

Once the state approves your Articles of Incorporation, your initial directors, or the incorporators if directors weren't named on the Articles, get together for the corporation's first official meeting. This is where the paperwork you've been preparing actually gets put into motion.

Typical business handled at this meeting:

Formally adopting the bylaws you drafted in Step 5
Electing officers; most Illinois corporations settle on a president, secretary, and treasurer at minimum
Issuing the initial shares of stock based on the structure you configured in Step 3
Setting the corporation's fiscal year
Authorizing whoever will open the corporate bank account to actually do so

Write formal minutes for this meeting and file them with your corporate records. You won't submit these to the state, and nobody's checking that they exist, but they're often the single strongest piece of documentation showing your corporation follows real formalities rather than existing only on paper, which matters enormously if liability protection is ever tested down the line.

Step 7: File for an EIN

With your Articles of Incorporation approved, the next move is applying for an Employer Identification Number. Think of it as a Social Security number for your corporation, a nine-digit federal ID that identifies your business separately from you as an individual.

Reasons your Illinois C Corp needs one:

Opening a business bank account, since most banks won't open a corporate account without it
Hiring employees, whether in Illinois or anywhere else
Filing your federal tax return and registering with the Illinois Department of Revenue
Applying for a business credit card or a business loan

You apply directly through the IRS website. The IRS doesn't charge a fee for this, and the online application usually takes about 15 minutes to complete. You'll need your business name, mailing address, and a reason for applying ready to go. If you don't have a Social Security number, the online path isn't available to you, but you can still apply by mailing or faxing Form SS-4 instead.

What Are the Post-Formation Requirements for a C Corp in Illinois?

Open a Business Bank Account:

Bring your Articles of Incorporation, your adopted bylaws, and your EIN confirmation letter to the bank when you set it up. Once it's open, keep it strictly separate from your personal finances, no personal bills paid from the business account, no business income deposited into your personal one. Mixing the two is one of the fastest ways to undermine the liability protection a corporation is supposed to provide.

Track Licenses and Permits needed for Your Business

Illinois doesn't issue a single universal business license that covers everyone. Instead, most corporations end up needing a local business license from the city or county where they operate, plus any industry-specific licenses such as a contractor's license for construction, a health permit for food service, or a professional license for regulated fields like healthcare or accounting. If you're selling taxable goods or services, register for a seller's permit through MyTax Illinois before your first sale.

You can either confirm which licenses apply to your business by conducting the research yourself or let Swyft's business license research service identify your specific federal, state, and local requirements so you're not left guessing.

Register for Illinois Corporate Income Tax

Illinois taxes corporate net income at a flat 7% rate for the current tax year, separate from and in addition to whatever you owe the IRS federally. You'll register through MyTax Illinois and receive an Illinois account ID, which is different from your federal EIN. Most corporations pay this quarterly through estimated tax payments if they expect to owe $400 or more for the year, so it's not just a once-a-year filing to plan around.

The state return (Form IL-1120) is generally due on the 15th day of the fourth month after your tax year ends, which lines up with the federal deadline for calendar-year corporations.

Register For the Illinois Personal Property Replacement Tax.

Despite the name, this has nothing to do with physical property; it's an additional state tax on net income specifically, layered on top of the corporate income tax above.

For a standard C Corp, the rate is 2.5%. Combine that with the 7% corporate income tax, and most Illinois C Corps land around 9.5% total on net income, a number worth budgeting for since it's noticeably higher than states that charge a single flat corporate rate.

This tax gets reported on the same IL-1120 return as your corporate income tax, so it's one filing covering both, but it's still worth understanding as a distinct line item since it affects your effective tax rate and any quarterly estimates you're setting aside.

File your Illinois Annual Report Every Year

This is a completely separate filing from either tax registration above, and it's easy to assume that owing no tax means nothing's due, which isn't the case. The annual report keeps the state's record of your officers, directors, and registered agent current, costs $75, and is due before the first day of your corporation's anniversary month each year.

How Much Does It Cost to Incorporate a C Corp in Illinois?

Item	Cost
Articles of Incorporation (Form BCA 2.10)	$150
Expedited processing (optional, 1 business day)	$100
Name Reservation (optional, 90 days)	$25
Assumed Name filing, corporation (varies by cycle year)	$30 to $150
Registered Agent Change	$25
Annual Report (every year)	$75
EIN (IRS)	$0

Need Help With Your C Corp Formation in Illinois?

Forming a C corp in Illinois means getting the Articles of Incorporation right, appointing a registered agent, setting up your initial board, and staying on top of state requirements. Swyft Filings has helped 600,000+ businesses get formed correctly since 2015. Our team knows Illinois Secretary of State requirements inside and out, so your paperwork gets filed right the first time, and you can focus on running your business.

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*Disclaimer: This guide offers general information about forming a C Corp in Illinois and is not a substitute for legal, tax, or financial advice.*

Check C Corp Formation Guides for Other States

C Corp rules, filing costs, and corporate tax structures vary by jurisdiction. Select any state below to view its specific C Corp laws.

Need Help With Your C Corp Paperwork?

Starting an Illinois C Corp means coordinating two agencies, an annual report tied to your incorporation anniversary, and a franchise-tax calculation. Swyft Filings has been helping businesses form and stay compliant since 2015. Our team knows the Illinois Secretary of State requirements and can file your C Corp quickly, accurately, and in full compliance.

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FAQ's

Starting a business can feel complex. We're here to provide clear answers to some of the most common questions entrepreneurs ask.

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The Illinois Secretary of State charges a $150 filing fee for the Articles of Incorporation. A 24-hour expedited option is available for an additional $100. Optional and ongoing costs include a $25 name reservation, roughly $50 to $300 per year for a commercial registered agent, and the annual report fee of $75 each year.

Illinois C Corps pay two state-level taxes on income: a corporate income tax of 7% and a Personal Property Replacement Tax of 2.5%, for a combined effective rate of 9.5% on net income.

Yes. Illinois corporations file a franchise-tax calculation with each annual report, based on paid-in capital represented in Illinois. The first $10,000 of annual franchise-tax liability is exempt, so most small corporations owe $0 in franchise tax and only pay the $75 annual report fee.

Standard processing takes about 10 business days. A 24-hour expedited option is available for an additional $100, and expedited requests must be submitted in person at the Springfield or Chicago office.

A C Corp is the right choice if you plan to raise venture capital, issue multiple classes of stock, or grant equity to employees. It is also the structure most institutional investors expect to fund. An LLC is simpler to run and offers pass-through taxation, making it better for owner-operated businesses.

Every corporation in Illinois starts as a C Corp by default. An S Corp is not a separate business structure; it is a federal tax classification. You elect S Corp status by filing IRS Form 2553. An S Corp passes income through to shareholders, while a C Corp is taxed at the entity level. C Corps have no limit on the number or type of shareholders.