A comprehensive guide to choosing between sole proprietorship, partnership, LLC, and corporation for your business.
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Table of Contents
You’re starting a business, and everyone’s throwing entity acronyms at you like curses in a dark ritual: LLC, S-Corp, C-Corp, sole proprietor, partnership.
Welcome to Entityville, a town where every business must choose a dwelling. Some entrepreneurs live in exposed cottages with no walls between them and the liability monsters lurking outside. Others barricade themselves in fortresses with strong protections—but only if they maintain the defenses. A few build ornate castles with maximum security, though the upkeep demands constant attention and formal rituals.
It feels like one wrong move could haunt you forever. Pick the right entity, and you don’t lose any sleep over it. Pick the wrong entity, and you could face double taxation, unlimited personal liability, or bureaucratic nightmares that drain your time and money.
Here’s the truth: There is no single “best” business structure. But there IS a best structure for YOUR specific situation, and it depends on your liability risk, your tax profile, your growth plans, and your tolerance for complexity.
I’m Julie King with King Patent Law, and I’ve helped many entrepreneurs navigate this exact decision. By the end of this guide, you’ll know exactly which dwelling in Entityville offers you the protection, flexibility, and peace of mind you need and avoid choosing the one that could fuel nightmares and horror stories.
Let’s explore the four main structures and help you choose where your business should live.
Why This Decision Matters (And Why You Can’t Ignore It)
“Can’t I just figure this out later?”
No. You really can’t. You can change your mind later, but that comes at a painful bureaucratic cost. Changing your mind can be expensive, can be time-consuming, and can trigger tax consequences.
Your business entity structure affects:
- Liability protection: Whether your personal assets are at risk if the business gets sued or goes into debt
- Tax treatment: How much you pay in taxes and when
- Credibility: How vendors, lenders, and customers perceive your business
- Fundraising ability: Whether and how easily you can raise capital or bring on partners
- Administrative burden: How much paperwork, formality, and ongoing compliance you’ll deal with.
- Exit options: How easy it is to sell your business
I’ve seen businesses make the wrong choice and pay dearly for it:
- The sole proprietor who got sued and lost their family home because they had zero liability protection
- The partnership that imploded when one partner racked up massive debt the other partner became legally responsible for
- The LLC owner who “pierced the corporate veil” by mixing personal and business finances, destroying their liability shield right when they needed it most
- The business that couldn’t attract investors because they’d structured as an LLC when it needed to be a C-Corp
These are real consequences of dwelling in the wrong structure.
The good news? Once you understand what each structure offers and what it costs, the right choice becomes clear.
The Exposed Cottage: Sole Proprietorship
What it is: You and the business are legally the same entity. There’s no separation. No walls. No protection.
How it’s formed: Automatically. If you start selling products or services without forming an LLC or corporation, you’re a sole proprietor. You might file a “Doing Business As” (DBA) name with your county or state, but that’s just a name registration—it doesn’t create a separate legal entity.
Who lives here: Freelancers, consultants, side hustlers testing an idea, ultra-low-risk service providers.
The setup:
- File a DBA if you want to operate under a business name.
- Get an EIN from the IRS (optional, but recommended).
- Open a business bank account (highly recommended, even though not required).
- Obtain necessary business licenses and permits.
- Report business income and expenses on your personal tax return (Schedule C).
Tax treatment:
- All business income flows directly to your personal tax return.
- You pay self-employment tax (15.3%) on net business income.
- No separate business tax return
- Simplest tax filing
The Exposed Cottage Looks Appealing at First
- Simplest possible structure: Literally zero formation paperwork (aside from a DBA)
- Cheapest to start: No filing fees (unless you file a DBA, which costs $25-$50 in most jurisdictions)
- Total control: You make all decisions; no partners or board to consult
- Easy tax filing: Report business income and expenses on your personal tax return (Schedule C).
- No separate bank account required: Though you absolutely should have one anyway
- No ongoing compliance requirements: No annual reports, no board meetings
For someone testing a business idea or running an extremely low-risk side gig, this can work temporarily.
But the Monsters Are Right Outside
The Biggest Threat: ZERO personal liability protection. This is the critical, terrifying flaw.
If your business gets sued, you get sued. If your business incurs debt, you owe that debt. If a customer is injured by your product or service, they can come after your house, your car, your savings, your retirement accounts—everything you own personally.
Let me say that again: Everything you own personally is at risk.
There’s no legal separation between you and the business. A judgment against the business is a judgment against you as an individual.
Other problems:
- Harder to get business loans: Banks see sole proprietorships as higher risk.
- Difficult to attract investors: No ownership structure to sell equity.
- Limited growth potential: You can’t bring on partners.
- Credibility issues: “Julie King DBA King Patent Law” sounds less established than “King Patent Law, PLLC.”
- No continuity: If you die or become incapacitated, the business dies with you.
- No separation for tax purposes: Can’t take advantage of certain tax strategies available to corporations.
Some Sole Proprietor Horror Stories
Imagine you run a small landscaping business. One of your employees (you thought they were an independent contractor, yet by law they weren’t) is seriously injured on a job site. The resulting lawsuit not only bankrupts the business but also forces you to sell your home to satisfy the judgment.
If you’d formed an LLC, your personal assets would have been protected. The LLC might have been liable, but you personally would not have been.
Or imagine you run a small consulting business as a sole proprietor. A client sues, claiming breach of contract. The client wins a $50,000 judgment. Because there was no liability protection, they go after your personal bank account, force the sale of your car, and put a lien on your house.
All of that could have been prevented with a $500 LLC formation.
Sole Proprietorship Bottom Line
This is how many businesses start, but you shouldn’t stay here long if you’re serious. As soon as you have customers, contracts, or any meaningful revenue, form an LLC. The risk isn’t worth the minimal cost savings.
The Exposed Cottage is only appropriate for:
- Businesses with zero liability exposure (though these are rare) or very low-risk activities (blogging, consulting where you carry professional liability insurance that will be enough to cover any potential liabilities)
- Testing a business idea before committing to formation costs
- Businesses with minimal revenue and no employees
If you have ANY meaningful liability risk, employees, significant revenue, or valuable personal assets to protect, GET OUT OF THIS STRUCTURE IMMEDIATELY.
The Shared Mansion: Partnership
What it is: Two or more people running a business together. You share the mansion, but you may also share responsibility for everything that happens inside it, even things your partners do without your knowledge.
How it’s formed: Here’s a scary fact: a general partnership can form automatically just by operating a business with someone else. You don’t have to file anything. In fact, you might accidentally create a partnership without realizing it. If you start a business with someone else and don’t file formation documents for an LLC or corporation, you’ve created a general partnership by default, whether you intended to or not.
Types of partnerships:
- General Partnership (GP): All partners share management and liability equally (or as specified in the agreement)
- Limited Partnership (LP): One or more general partners (full liability) and one or more limited partners (liability limited to investment, no management role)
- Limited Liability Partnership (LLP): Partners have limited personal liability; often used by professional service firms (lawyers, accountants, architects)
- Limited Liability Limited Partnership (LLLP): General partners (no liability, unlike limited partnership) manage the business, and one or more limited partners (liability limited to investment, no management role). This is the only kind of partnership I recommend. Not all states allow them.
We’re focusing on general partnerships here since they’re most common for small businesses.
Tax treatment:
- The partnership files an informational return (Form 1065).
- Each partner receives a K-1 showing their share of income/loss.
- Partners report their share on personal tax returns.
- Partners pay self-employment tax on their earnings.
- There’s no double taxation.
The (Slight) Advantages
Partnerships do have some benefits:
- Shared workload and investment: You’re not doing everything alone.
- Complementary skills: Different partners bring different expertise.
- Relatively simple formation: If you’re going to partner, at least a general partnership requires no paperwork (though you absolutely should have a written agreement).
- Pass-through taxation: Partnership income flows through to partners’ personal returns; no entity-level tax.
Why the Shared Mansion Can Turn Into a Nightmare
The terrifying rule of general partnerships: Each partner is personally liable for ALL business debts and obligations, even ones created solely by another partner.
Read that again.
If your partner in a general partnership signs a lease, takes out a loan, or causes a lawsuit, you are personally liable even if you had no knowledge of their actions and didn’t approve them.
A partnership horror story:
Two friends started a business together. No written agreement, no LLC, just a handshake and shared dreams. Partner A, without telling Partner B, purchased $50,000 worth of equipment on credit. Then Partner A disappeared. Partner B, who never knew about the purchase, was personally liable for the entire $50,000 debt. The creditor went after Partner B’s personal assets. Partner B lost their savings. This is not a rare scenario. This is the default rule for general partnerships.
Why You Should Almost Never Choose This Structure
Critical disadvantages:
- Each partner has unlimited personal liability for all partnership debts. Like sole proprietorships, your personal assets are exposed. This is the nightmare fuel. If your partner signs a $100,000 lease without telling you, you’re on the hook for the full amount.
- Partners can bind each other: One partner’s actions within the scope of the business obligate all partners
- Partnership disputes are messy and expensive: When partnerships go bad, they tend to go REALLY bad
- Default rules may not reflect your intentions if you don’t have a written agreement
- No continuity. Partnerships typically dissolve when a partner leaves or dies unless you have specific succession provisions.
- Complicated to exit: Dissolving a partnership or buying out a partner requires negotiation and often legal fees
State default rules can haunt you:
If you don’t have a written partnership agreement, your state’s default partnership laws govern. In most states, that means:
- Profits and losses are split equally (even if one partner contributed more capital or does more work).
- Major decisions require unanimous consent.
- Partners can’t transfer their ownership interest without the consent of the other partners.
- The partnership dissolves automatically upon the death or withdrawal of any partner.
These defaults may be completely contrary to what you and your partners intended.
Partnership Bottom Line
Best for: Almost no one. Seriously.
The only scenario where a partnership makes sense is a very short-term, very low-risk collaboration with a highly trusted partner when forming an LLC isn’t worth the cost, such as two people collaborating on a single small project.
Partnerships are the entity structure I most strongly recommend AGAINST. The liability exposure is simply too great, and the disputes that arise are too costly. Form an LLC instead.
If You Must Partner: Do It Right
- Draft a partnership agreement (CRITICAL) that must address:
- Ownership percentages,
- Capital contributions (who put in what),
- Profit and loss allocation,
- Management authority and decision-making processes,
- What happens if a partner wants to leave,
- What happens if a partner dies or becomes incapacitated,
- How disputes will be resolved, and
- Buy-sell provisions (how remaining partners can buy out a departing partner’s interest).
- File a DBA if operating under a business name.
- Get an EIN from the IRS.
- Open a business bank account.
- Obtain business licenses and permits.
- File a partnership tax return (Form 1065) even though the partnership itself doesn’t pay tax.
- In Illinois: General partnerships must file a Statement of Partnership Authority if they want to authorize specific partners to transfer real property. Limited partnerships must file a Certificate of Limited Partnership with the Illinois Secretary of State. LLPs must file a Statement of Qualification.
NEVER operate as a general partnership. If you’re going into business with someone else, you should:
- Form an LLC instead (the Fortress—see next section), or
- If you’re in a profession that requires an LLP (lawyers, accountants, architects in many states), form an LLP. That will provide some liability protection (varies by state) but still requires a comprehensive written partnership agreement.
The Shared Mansion is dangerous. If you’re going to share a dwelling, make it a fortress (LLC) instead, and get everything in writing.
The Fortress: Limited Liability Company (LLC)
Now we’re getting into structures with actual serious liability protection, if they’re done properly.
What it is: An LLC is a legal entity separate from its owners (called “members”). It provides liability protection while offering flexible tax treatment and less formality than a corporation. Through creating that legal separation between you and your business, the fortress has strong walls that generally protect your personal assets from business liabilities.
Who lives here: The vast majority of small businesses. LLCs are the most popular business structure in the United States for good reason.
The setup: LLCs are relatively easy to form and maintain compared to corporations. Most states allow single-member LLCs (just you) or multi-member LLCs (you and partners).
- File Articles of Organization with your state (in Illinois, file with the Secretary of State).
- Pay filing fees (varies by state; Illinois charges $150 for online filing, $500 for expedited paper filing).
- Appoint a registered agent (person or service to receive legal documents).
- Draft an Operating Agreement (highly recommended, even though not required in most states). I won’t set up an LLC with more than one member without one. You’ll most likely need one to get a bank account, loan, etc. anyway.
- Get an EIN from the IRS.
- Open a business bank account.
Tax treatment (this is where it gets interesting): LLCs have flexible tax treatment. You can choose how you want to be taxed:
- Default taxation:
- Single-member LLC: Taxed as a sole proprietorship (disregarded entity)
- Multi-member LLC: Taxed as a partnership
- Elective taxation:
- You can elect to be taxed as an S-Corporation
- You can elect to be taxed as a C-Corporation
This flexibility is one of the LLC’s biggest advantages. You can start with simple pass-through taxation and later elect S-Corp treatment if your profits justify the self-employment tax savings. (More on S-Corp elections in the corporation section below.)
Why the Fortress Is So Popular
Advantages:
- Liability protection
This is the primary reason to form an LLC. If the business gets sued or incurs debt, generally only the LLC’s assets are at risk, not your personal house, car, savings, or other assets.
The legal term is “limited liability.” You can lose what you invested in the business, but creditors can’t come after your personal assets (with important exceptions we’ll discuss).
- Flexible management structure
LLCs can be:
- Member-managed: All owners (members) participate in day-to-day management.
- Manager-managed: Members appoint one or more managers (who may or may not be members) to run operations.
This flexibility lets you structure management however it makes sense for your business.
- Flexible ownership and profit distribution
Unlike corporations, LLCs aren’t required to allocate profits based on ownership percentage. Your operating agreement can specify any distribution arrangement you want.
Example: Member A owns 60%, Member B owns 40%, but they agree to split profits 50/50 because Member B contributes more labor.
- Tax flexibility
Pass-through taxation is the default.
LLCs can elect to be taxed as:
- Sole proprietorship (default for single-member; income reported on Schedule C))
- Partnership (default for multi-member; income flows through to members’ personal returns via K-1 forms)
- S-Corporation (if you meet requirements)
- C-Corporation (rarely beneficial, but possible)
Unless you choose C-Corp taxation, you avoid the “double taxation” that C-Corps face.
This means you can start as a simple pass-through entity and later elect S-Corp taxation if it becomes advantageous as your profits grow. Always consult with a tax professional before making tax elections.
- Credibility
“King Patent Law, PLLC” sounds more established and professional than “Julie King DBA King Patent Law.”
Vendors, customers, lenders, and potential partners take LLCs more seriously than sole proprietorships.
- Less formality than corporations
LLCs don’t require:
- Board of directors (though you can have one),
- Annual shareholder meetings,
- Corporate minutes and resolutions (though you should document major decisions), or
- Strict formalities around stock issuance.
- Continuity
Unlike sole proprietorships and many partnerships, an LLC can continue to exist even if a member leaves or dies (if your operating agreement provides for this).
Disadvantages and requirements: The Fortress Requires Maintenance
LLCs are not “set it and forget it.” You must maintain the structure properly or you risk losing your liability protection.
- Formation and maintenance costs
- Filing fees to create the LLC ($150 in Illinois)
- Registered agent fees (if you use a service): $100-$300/year
- Annual report fees ($75 in Illinois for domestic LLCs)
- Operating agreement drafting (DIY or attorney fees)
- Ongoing formalities
While less formal than corporations, LLCs still require:
- Separate bank account (critical; never mix personal and business funds)
- Proper record-keeping (financial records, major decisions documented)
- Operating agreement (even if you’re the only member)
- Annual reports filed on time. In Illinois, annual reports are due by the first day of the anniversary month of formation (e.g., if you formed in March, your annual report is due by March 1 each year).
- Proper use of the LLC name (always use “LLC” or “PLLC” in contracts, on letterhead, etc.). Get a DBA/assumed name (requires filing with the Secretary of State in Illinois) if you do not want to use it all the time. The thing is, it’s the LLC part that tells the world you’ve selected a limited liability entity, so they can’t go after your personal wealth.
- Self-employment tax on all income (unless you elect S-Corp taxation)
LLC members are generally considered self-employed. All business income is subject to self-employment tax (15.3% on the first $168,600 of net earnings in 2024, subject to adjustment annually).
For profitable businesses, this can be a significant tax burden. This is why many profitable LLCs elect S-Corp taxation to reduce self-employment tax. Consult a tax professional to determine if this makes sense for you.
- The fortress walls can be breached: “Piercing the Corporate Veil”
This is critical. Your LLC’s liability protection is NOT absolute.
Courts will “pierce the corporate veil” and hold you personally liable if:
You mix personal and business finances, such as:
- Paying personal expenses from the business account,
- Depositing business income into your personal account,
- Using business funds for personal purchases, or
- Not maintaining a separate business bank account.
You fail to maintain proper formalities:
- Not filing annual reports,
- Not keeping business records,
- Not having an operating agreement if one is required, or
- Operating while not in good standing with the state.
You undercapitalize the business:
- Using the LLC as a shell with no real assets,
- Not maintaining adequate insurance, or
- Treating the LLC as your personal piggy bank.
You commit fraud or illegal acts, such as:
- Using the LLC to perpetrate fraud (like transferring personal assets to the LLC to shield them from personal creditors),
- Engaging in illegal activities through the LLC (like money laundering), or
- Misleading creditors about the business’s financial condition.
Personal guarantees:
- If you personally guarantee a business loan or lease, you’re personally liable regardless of the LLC structure.
- Many lenders do require personal guarantees from LLC owners, especially for new businesses.
Your own negligence or malpractice:
- If you personally commit malpractice, negligence, or intentional wrongdoing, the LLC doesn’t shield you from liability for your own actions.
- Example: If you’re a lawyer and you commit malpractice, you’re personally liable even though you operate through a PLLC.
An LLC horror story:
A roofing contractor formed an LLC but then:
- Paid his mortgage from the business bank account,
- Deposited client payments into his personal account,
- Never filed annual reports, and
- Had no operating agreement.
When he got sued, the court pierced the veil. The LLC offered zero protection because he’d treated it as an alter ego of himself rather than as a separate entity.
The fortress walls only protect you if you maintain them properly.
How to maintain your LLC protection:
- Open a separate business bank account and use it exclusively for business.
- Never pay personal expenses from the business account. If you make a mistake, fix it right away and make proper notations in your records.
- Maintain an operating agreement and follow it.
- If you have an LLC with multiple members, document major decisions.
- File annual reports on time.
- Keep adequate capital in the business.
- Sign contracts in the LLC’s name, not your personal name (“Jane Doe, Manager of ABC LLC” not “Jane Doe”).
Professional LLCs (PLLCs) – Illinois-Specific
In Illinois, certain licensed professionals must use a Professional Limited Liability Company (PLLC) instead of a regular LLC.
Professions that must use a PLLC in Illinois include (but aren’t limited to):
- Attorneys
- Physicians and surgeons
- Dentists
- Podiatrists
- Veterinarians
- Optometrists
- Architects
- Professional engineers
- Land surveyors
- Accountants (CPAs)
- Other professions licensed under the Professional Service Corporation Act
However, a PLLC does NOT protect you from liability for your own professional malpractice. It only protects you from liability for business debts and other members’ malpractice (to the extent state law allows).
If you’re in a licensed profession in Illinois, verify whether you’re required to use a PLLC rather than a standard LLC.
Formation costs are the same as regular LLCs in Illinois ($150 filing fee), but you must include additional statements in your Articles of Organization certifying that all members are licensed in the profession. At this time, you still have to do this by mail, too, rather than online. Super annoying.
Series LLCs – An Advanced Option
Illinois is one of the states that allows Series LLCs (other states include Delaware, Nevada, Tennessee, Texas, and a handful of others).
What it is: A Series LLC is a single LLC that can create multiple “series” within it, each with separate assets, liabilities, and members. It’s like an umbrella corporation with subsidiaries.
Think of it as one fortress with multiple secure vaults inside. Each vault (series) is legally protected from the liabilities of the other vaults.
When this makes sense:
- Real estate investors: Each property can be its own series, so a lawsuit related to one property doesn’t affect the others.
- Multiple brand owners: If you own several distinct brands or product lines, each can be a separate series.
- Businesses with distinct divisions: Each division operates as its own series with separate accounting.
Advantages:
- You only file and pay for ONE LLC formation, then create series under it as needed.
- One annual report fee instead of multiple (in Illinois, it’s $75 + $50 per series),
- Simpler administration than forming separate LLCs, and
- Liability protection between series (if properly maintained).
Disadvantages:
- More complex to set up and maintain: Requires meticulous record-keeping and separation between series.
- Not recognized in all states: If you do business in states that don’t recognize Series LLCs, you may not get the liability protection.
- Unclear federal tax treatment: The IRS hasn’t issued definitive guidance on whether each series is taxed separately.
- Less tested in court: Because Series LLCs are relatively new, there’s less case law on whether the liability protection holds up.
In Illinois: Series LLCs file Articles of Organization just like regular LLCs, but must include specific language creating the series structure. Each series must be designated in the Articles or in the operating agreement. The annual report fee is $75 for the LLC plus $50 for each series.
Bottom line on Series LLCs
This is an advanced structure. If you’re considering it, consult with both a business attorney and a tax professional to ensure it’s properly set up and makes sense for your situation. For most small businesses, regular LLCs are simpler and sufficient.
The Bottom Line on LLCs: When the Fortress Is Right for You
This is the sweet spot for most small businesses. You get liability protection, tax flexibility, operational simplicity, and credibility, all without the heavy compliance burden of a corporation. The LLC is the best choice for most small businesses if:
- You have any meaningful liability risk,
- You want credibility and a professional appearance,
- You want flexibility in management and profit distribution,
- You want pass-through taxation but also the option to elect S-Corp treatment later,
- You can handle the administrative requirements (separate bank account, annual reports, proper record-keeping), and
- You’re willing to pay formation and annual fees ($150 + $75/year in Illinois, plus a registered agent if using a service).
The LLC is the default recommendation for most entrepreneurs unless there’s a specific reason one of the other structures makes more sense. If you’re starting a business and aren’t sure what to choose, form an LLC. You can always change tax treatment or convert to a corporation later if your business grows to the point where it makes sense.
The Corporate Castle: S-Corporation and C-Corporation
Corporations are more complex than LLCs, but they offer advantages for certain businesses, especially those planning to raise investment capital or go public eventually.
What they are: Corporations are separate legal entities, distinct from their owners (shareholders). The castle has the strongest walls and most formal structure.
How they’re formed:
- File Articles of Incorporation with your state (in Illinois, file with the Secretary of State)
- Pay filing fees (Illinois charges $150 for online filing, $500 for expedited)
- Appoint a registered agent
- Draft corporate Bylaws (internal rules governing the corporation)
- Appoint a board of directors
- Issue stock certificates to shareholders
- Draft a shareholder agreement governing the corporation’s relationship with its shareholders
- Hold an organizational meeting
- Appoint corporate officers (president, secretary, treasurer, or the equivalent, like CEO, COO, and CFO, ata minimum)
- Get an EIN from the IRS
- Open a business bank account
In Illinois, filing fees are $150 for domestic corporations ($100 filing fee + $50 initial franchise tax, which is based on paid-in capital but has a $50 minimum).
Types (tax elections, not actual types of corporations):
- C-Corporation – The default corporate form; subject to corporate income tax
- S-Corporation – Not a separate formation type, but a tax election a C-Corp or LLC can make; provides pass-through taxation
Who lives here: Businesses seeking venture capital, planning to go public, needing complex ownership structures, or (for S-Corps) wanting to reduce self-employment taxes.
C-Corporation: The Traditional Castle
What makes it different:
- Separate taxable entity
Unlike LLCs, partnerships, and sole proprietorships, a C-Corp pays its own income tax on profits. This is the key distinction.
Currently, the federal corporate tax rate is 21% (as of 2024, subject to change).
- Double taxation
Here’s where it gets complicated and expensive:
- The corporation pays federal corporate income tax on its profits (currently 21% flat rate, but this can change), as well as state and sometimes local income tax.
- When the corporation distributes profits to shareholders as dividends, shareholders pay personal income tax on those dividends
This is “double taxation,” meaning the same money is taxed twice: once at the corporate level as corporate income tax on profits, once at the individual level as dividends from profits.
Example:
- The corporation earns $100,000 profit
- Corporation pays $21,000 in federal tax (21%), leaving $79,000
- Corporation distributes $79,000 to shareholders as dividends
- Shareholders pay $15,800 in tax (using 20% rate for simplicity on qualified dividends), leaving $63,200
That $100,000 profit got taxed $36,800 total, leaving shareholders with $63,200.
For most small businesses, this is a terrible result. Compare this to pass-through taxation (LLC, S-Corp, partnership), where you only pay tax once at your individual rate.
When double taxation isn’t as bad as it sounds:
- If you’re reinvesting profits back into the business (not distributing dividends), you only pay the 21% corporate rate.
- If you’re paying yourself a salary (not dividends), that’s deductible to the corporation, avoiding double tax on that portion.
- If your individual tax rate is high, the flat 21% corporate rate might actually be lower than your personal rate (though you’ll pay tax again when you eventually take the money out).
- Formalities and complexity
C-Corps require all the formation formalities listed above, plus:
- Annual shareholder meetings,
- Annual board meetings,
- Corporate minutes documenting all major decisions, and
- Strict adherence to corporate formalities.
Failing to maintain these formalities can result in piercing the corporate veil, just like with LLCs.
- More expensive to form and maintain
- Higher formation costs (attorney fees for bylaws, stock issuance, etc.)
- Annual franchise taxes or fees (varies by state; Illinois requires an annual report with a filing fee)
- More complex accounting and tax filing (corporate tax return plus personal returns)
When a C-Corp makes sense:
Despite the disadvantages, C-Corps are the right choice for:
Businesses seeking venture capital
- VCs typically require a C-Corp structure
- Allows for multiple classes of stock (common, preferred)
- Easier to grant stock options to employees
Businesses planning to go public
- Only C-Corps can have an IPO
- It’s a required structure for public companies
Businesses with complex ownership structures
- Works well for multiple classes of stock with different rights (though an LLC can also handle multiple classes of ownership with different rights if it’s done properly)
- Want to issue stock options or restricted stock units to employees
International businesses
- Some foreign investors prefer or require a C-Corp structure
Businesses that will retain earnings
- If the business plans to reinvest profits rather than distribute them, the double taxation problem is deferred
- The corporate tax rate may be lower than shareholders’ individual rates
Certain industries
- Some industries (biotech, high-tech startups) default to C-Corp because that’s what investors expect
Illinois-specific note on professional corporations: Similar to professional LLCs, Illinois requires certain licensed professionals to form a Professional Corporation (PC) instead of a standard corporation if providing professional services. Same professionals as PLLCs: attorneys, doctors, accountants, architects, etc.
For 95% of small businesses, a C-Corp is the WRONG choice because of double taxation and administrative complexity.
If you’re not raising venture capital or planning to go public, you probably don’t need a C-Corp. Start with an LLC. If you reach the point where investors are asking you to convert to a C-Corp, that’s a good problem to have, and you can convert at that point.
S-Corporation: The Hybrid Castle
What it really is: An S-Corporation is not a separate formation type. It’s a tax election that a C-Corporation (or LLC) can make.
You form a C-Corp (or LLC), then file Form 2553 with the IRS to elect S-Corp taxation. An S-Corp election tells the IRS: “I want pass-through taxation (like an LLC or partnership) instead of C-Corp double taxation.” That election must be filed by March 15 of the tax year you want the election to take effect, or within 2 months and 15 days of forming the entity
The key advantage: Pass-through taxation with potential self-employment tax savings
S-Corps avoid double taxation. Like LLCs and partnerships, profits flow through to shareholders’ personal tax returns (via K-1 forms). There’s no entity-level tax (so no double taxation).
Here’s the tax benefit:
S-Corp owners can split their income into:
- Salary (subject to payroll tax: Social Security and Medicare, 15.3% total split between employee and employer portions)
- Distributions (NOT subject to self-employment tax)
Example:
LLC member earning $150,000:
- All $150,000 subject to self-employment tax
- Self-employment tax: ~$21,000 (15.3% on first $137,700, plus 2.9% on the remainder)
S-Corp shareholder earning $150,000:
- Takes $80,000 as salary (subject to payroll tax: ~$12,000)
- Takes $70,000 as distributions (NOT subject to self-employment tax: $0)
- Total payroll tax: ~$12,000
Tax savings: ~$9,000 per year
This is a significant advantage for profitable businesses.
The Critical Catch: “Reasonable Salary”
The IRS requires S-Corp shareholders who work in the business to pay themselves a “reasonable salary.”
You can’t pay yourself $20,000 in salary and take $130,000 in distributions. The IRS will reclassify those distributions as salary and hit you with back taxes and penalties.
What’s “reasonable”? The IRS looks at:
- What comparable businesses pay for similar work,
- Your qualifications and experience,
- Time spent working in the business, and
- Duties and responsibilities.
General rule of thumb: If you’re working full-time in the business, your salary should be at least what you’d pay someone else to do your job. Sometimes that means you pay yourself all as salary and nothing as distribution.
This is why you MUST work with a tax professional if you elect S-Corp taxation. Getting the salary vs. distribution split wrong can result in IRS audits, penalties, and interest.
S-Corp Restrictions and Requirements
S-Corps have strict limitations:
Ownership restrictions:
- Maximum 100 shareholders
- All shareholders must be U.S. citizens or residents
- Only individuals, certain trusts, and estates can be shareholders (no corporations or partnerships)
- Only one class of stock allowed (though voting rights can differ)
Formalities:
- Must still maintain formalities of the underlying LLC or corporation (board meetings, minutes, bylaws, annual reports, etc.)
- Must run payroll for member/shareholder-employees (payroll taxes, quarterly filings, W-2s)
- More complex tax filings than sole proprietorships or partnerships
When S-Corp election makes sense:
For LLCs:
- Business is profitable (generally at least $60,000-$80,000 in net income)
- Owner actively works in the business (can justify salary)
- Self-employment tax savings outweigh the additional complexity and payroll costs
For C-Corps:
- Want to avoid double taxation
- Meet the S-Corp ownership restrictions
- Don’t need multiple classes of stock
When S-Corp election does NOT make sense:
- Business is not yet profitable or has minimal profit
- Owner doesn’t actively work in the business
- Business has foreign investors or corporate investors
- Business needs multiple classes of stock (for venture capital or complex ownership)
Best for:
- Profitable small businesses ($60K+ net income)
- Service-based businesses with low overhead (where a large percentage of revenue is profit)
- Businesses that don’t plan to raise outside investment
- Owners who want to minimize self-employment taxes
Work with a CPA to determine if the math makes sense for your specific situation.
Professional Corporations (PCs) – Illinois-Specific
Just like with LLCs, certain licensed professionals in Illinois must use a Professional Corporation (PC) instead of a standard corporation.
The same professions required to use PLLCs must form PCs: attorneys, physicians, dentists, accountants, architects, engineers, and others licensed under the Professional Service Corporation Act.
Key points:
- All shareholders must be licensed in the profession
- Does NOT protect you from your own professional malpractice
- Can elect S-Corp taxation if you meet the requirements
- Subject to the same formalities as regular corporations
In Illinois: Articles of Incorporation for a PC must include a statement that the corporation is organized under the Professional Service Corporation Act and that all shareholders are licensed professionals.
Choosing Between an LLC and a Corporation
For most small businesses, the decision comes down to LLC vs. S-Corp (either as an LLC electing S-Corp taxation or as a corporation electing S-Corp taxation).
Choose LLC (default recommendation) if:
- You want simplicity and flexibility
- You’re starting out or are not yet highly profitable
- You want pass-through taxation without payroll complexity
- You might have foreign investors or need flexible ownership structures
- You value less formality
Choose LLC with S-Corp election if:
- Your business is profitable (generally $60,000+ net income)
- You work full-time in the business
- Self-employment tax savings justify the added payroll complexity
- You meet S-Corp ownership requirements
Choose C-Corp if:
- You’re raising venture capital
- You’re planning to go public
- You need multiple classes of stock
- Your investors require it
Consult a tax professional: The tax implications of entity choice are complex and depend on your specific situation. Always work with a CPA or tax advisor before making tax elections or choosing entity structure based on tax considerations.
The Decision Framework: Choosing Your Dwelling in Entityville
Now that you understand the four main structures, here’s how to decide which is right for you.
Ask yourself these five questions:
Question 1: What’s your personal liability risk?
Think honestly about whether someone could sue your business or whether the business could incur debts you can’t pay.
High risk (Anything involving professional licenses (medical, legal, accounting, architecture), manufacturing or selling products that could cause physical harm, construction or contracting, anything with significant contracts or debt obligations):
Sole proprietorship – too exposed- General partnership – too exposed
LLC – good protection if maintained properly- Corporation – maximum protection
Medium risk (Most service businesses (consulting, coaching, marketing), e-commerce selling physical products, any business with employees or contractors, growing revenue, some valuable assets):
- LLC – best balance of protection and simplicity
Low risk (you’re a solo blogger, consultant with professional liability insurance, minimal customer interaction):
Sole proprietorship – acceptable temporarily if you have insurance and minimal assets- LLC – still better for credibility and growth potential
Question 2: What’s your tax situation and profitability?
Net income under $40,000/year:
- Sole proprietorship or LLC – simplest tax treatment
- S-Corp – not worth the payroll complexity yet
- C-Corp – terrible idea (double taxation with no profits to reinvest)
Net income $40,000-$200,000/year:
- LLC – still simple, good protection
- S-Corp election – consider with tax advisor; may start to make sense at upper end
Net income $200,000+/year:
- LLC with S-Corp election – likely worthwhile for self-employment tax savings
- C-Corp – only if raising venture capital or going public
Consult a tax professional: These are general ranges. Your specific situation (deductions, other income, state taxes, etc.) affects whether the S-Corp election makes sense.
Question 3: What are your growth and fundraising plans?
Solo operation, no plans to raise money or bring on partners:
- Single-member LLC – simple, flexible
Planning to bring on partners eventually:
- Multi-member LLC – flexible ownership and management
- Sole proprietorship – can’t have partners
- Partnership – too risky without LLC protection
Raising venture capital or planning to go public:
- C-Corp – required by most VCs and for IPOs
- LLC – VCs generally won’t invest
- S-Corp – ownership restrictions prevent VC investment
Bringing on investors but staying private:
- LLC – can work for friends/family investors or accredited investors
- C-Corp or S-Corp – if you need more formal structure
Question 4: How much complexity can you handle?
Minimal tolerance for paperwork and formalities:
- Sole proprietorship – zero formalities (but zero protection)
- LLC – some formalities (annual reports, separate bank account, operating agreement), but manageable
Willing to handle moderate complexity:
- LLC with S-Corp election – adds payroll and more complex tax filings
- S-Corp (formed as corporation) – corporate formalities plus S-Corp tax treatment
Comfortable with significant complexity and cost:
- C-Corp – extensive formalities, board meetings, complex tax filings, higher costs
Question 5: What’s your budget for formation and maintenance?
Minimal budget (under $1000 for formation):
- Sole proprietorship – $0-$50 for DBA
- LLC – $150 formation in Illinois plus DIY/internet operating agreement (but pay an attorney for a better one as soon as you can if you are a multiple-member LLC)
Moderate budget ($1000-$5,000):
- LLC with attorney-drafted operating agreement
- S-Corp formation with basic attorney and CPA guidance
Larger budget ($5,000+):
- Corporation with comprehensive bylaws, stock agreements, attorney guidance
- Series LLC with proper setup
- Complex multi-member LLC with detailed operating agreement
Annual maintenance costs:
- Sole proprietorship: $0 (though you should have business insurance)
- LLC: $75/year in Illinois (annual report) + registered agent if using service ($100-$300/year)
- Corporation: $75-$100/year in Illinois (annual report + franchise tax) + registered agent
- S-Corp: Same as the underlying LLC/corporation, plus payroll processing costs
The Typical Progression: How Businesses Evolve
Many businesses don’t stay in one structure forever. Here’s a common path:
Stage 1: Testing the idea
- Structure: Sole proprietorship
- Why: Zero cost, minimal commitment
- Duration: 3-6 months while validating the business
Stage 2: Committing to the business
- Structure: LLC
- Why: Liability protection, credibility, still simple
- Trigger: First paying customer, first employee, or deciding “this is real”
Stage 3: Growing profits
- Structure: LLC with S-Corp election
- Why: Self-employment tax savings become significant
- Trigger: Net income exceeds $60,000-$80,000
Stage 4: Raising capital or going public (if applicable)
- Structure: C-Corp
- Why: Required by investors or for IPO
- Trigger: Seeking venture capital or planning to go public
You can change structures as you grow. It’s not a permanent, irreversible decision. The key is choosing the right structure for where you are NOW, not where you hope to be in 5 years.
Special Considerations
If you’re forming a business in multiple states:
- Form your LLC/corporation in ONE state (usually where you’re primarily operating),
- File for “foreign qualification” in other states where you do substantial business, and
- Each state will charge its own fees and require its own annual reports.
If you’re a single-member LLC:
- Some states (not Illinois) don’t provide liability protection for single-member LLCs in certain circumstances.
- Consider getting adequate business insurance as an additional layer of protection.
- Maintain impeccable separation between personal and business finances.
If you’re a married couple running a business together:
- In community property states, a married couple can be treated as a single-member LLC for tax purposes (not applicable in Illinois, which is not a community property state).
- Otherwise, you’re a multi-member LLC and need an operating agreement even though you’re married (think about what could happen in a divorce if you don’t have one to set the rules). It’s like a prenup for the LLC.
Common Mistakes to Avoid
Mistake #1: Choosing solely based on taxes or on what your friend did
“My friend has an S-Corp, so I should too.”
Your friend’s tax situation, liability risk, and business model are different from yours. What works for them might be terrible for you.
Entity choice affects liability, credibility, fundraising ability, and operational complexity, not just taxes. Don’t optimize for taxes while leaving yourself exposed to liability.
Do this instead: Analyze YOUR specific situation using the framework above.
Mistake #2: Forming an LLC but treating it like a sole proprietorship
If you form an LLC but then:
- Mix personal and business funds,
- Don’t maintain separate bank accounts,
- Fail to file annual reports, or
- Don’t have an operating agreement.
You’ll pierce the corporate veil and lose your liability protection. The LLC only works if you maintain it properly.
Do this instead: Open a business bank account immediately after forming the LLC. Use it exclusively for business. Keep records. Follow your operating agreement.
Mistake #3: Staying a sole proprietorship too long
If you have employees, significant revenue, valuable contracts, or personal assets to protect, GET OUT of a sole proprietorship structure immediately. The risk is not worth the minimal savings in formation costs.
Mistake #4: Electing S-Corp too early
S-Corp saves on self-employment taxes, but it adds payroll compliance costs. If your business isn’t profitable enough yet, you’re spending money on payroll services for minimal or no tax savings.
Do this instead: Wait until the math clearly favors it. Run the numbers with a CPA first.
Mistake #5: Assuming “online formation services” handle everything
LegalZoom, Rocket Lawyer, and similar services will file your Articles of Organization or Incorporation. But they generally:
- Don’t provide customized operating agreements or bylaws (I’ve seen some that didn’t even have any provisions to cover if there were disagreements or closing the business),
- Don’t help you understand what formalities you must maintain,
- Don’t provide customized tax or legal strategy advice, and
- Don’t tell you about state-specific requirements (like professional entity rules).
Do this instead: For very simple LLCs, these services can work, though for what limited amount they do you could read a few articles online or get a Nolo book and DIY for less. For anything complex, or if you’re in a regulated profession, consult an attorney.
Mistake #6: Not having an operating agreement
Even if you’re a single-member LLC, you should have an operating agreement. It clarifies:
- How the LLC is managed,
- What happens if you want to bring on members later,
- What happens if you die or become incapacitated, and
- How profits and losses are allocated.
Without one, your state’s default LLC laws govern, and they may not reflect your intentions.
Mistake #7: Choosing a partnership without a written agreement
Never, ever operate a partnership (or multiple-member LLC) without a comprehensive written agreement. If you and someone else are running a business together without a written partnership or operating agreement, you’re setting yourself up for disaster. The default state laws are almost certainly not what you want, and partnership disputes without written agreements are expensive nightmares.
Do this instead: Form an LLC with a detailed operating agreement, or at minimum, have a lawyer draft a partnership agreement before moving forward. It’s so much cheaper to pay a lawyer for a good agreement at the beginning than to pay a lawyer to try to clean up a disaster later.
Mistake #8: Not updating your entity structure as your business grows
What made sense when you started might not make sense three years later. If you’re still a sole proprietor doing $200K in revenue, you’re taking massive unnecessary risk.
Do this instead: Review your entity structure annually. As your business grows, revisit whether your current structure still serves you.
When to Call a Lawyer
You can do much of the entity formation yourself (filing the Articles of Organization/Incorporation online is straightforward if you have a one-person or very small and very uncomplicated business), but you should consult an attorney if:
- You’re forming a business with others (you NEED an operating agreement)
- You’re unsure about liability risks in your specific industry
- You’re dealing with professional licensing requirements
- You’re considering a Series LLC or other complex structure
- You’re converting from one entity type to another
- You’re raising investment capital
- You’re operating in multiple states
Think of it this way: Entity formation can be DIY-able. The operating agreement and strategic advice are not.
The cost of getting it wrong far exceeds the cost of a consultation.
Conclusion: Choose Your Dwelling Wisely
The structure you choose determines whether you sleep soundly knowing your personal assets are protected, or lie awake worrying about the monsters outside.
You now know:
- Sole proprietorships offer zero protection but maximum simplicity
- Partnerships double your risk and should be avoided
- LLCs are the sweet spot for most small businesses—liability protection, tax flexibility, operational simplicity
- S-Corp election can save taxes if you’re profitable enough
- C-Corps are best for raising institutional capital or going public
The “best” structure depends on YOUR liability risk, YOUR tax situation, YOUR growth plans, and YOUR tolerance for complexity.
For most small businesses, the answer is clear: Form an LLC.
It provides liability protection, credibility, and flexibility without the extreme formalities of a corporation. As you grow and become more profitable, you can elect S-Corp taxation to reduce self-employment taxes.
If you’re raising venture capital or planning to go public, you’ll need a C-Corp. If you’re testing a very low-risk idea with minimal investment, sole proprietorship might work temporarily—but only temporarily.
Whatever you choose, maintain it properly:
- Keep business and personal finances completely separate
- File annual reports on time
- Maintain required formalities (operating agreement, bylaws, minutes, etc.)
- Stay in good standing with your state
- Get proper insurance
- Work with a tax professional on tax elections and strategy
The right structure, properly maintained, gives you the protection and peace of mind to focus on growing your business instead of worrying about personal liability.
Avoid the legal horrors, and keep rocking your IP.
If you’re not sure which structure is right for your specific situation, if you’re in Illinois, schedule a consultation at kingpatentlaw.com or call 217-714-8558. We’ll review your liability risk, tax situation, and growth plans to recommend the best structure for your business.
King Patent Law helps entrepreneurs across the U.S. make smart, legally sound decisions about their intellectual property and business structure. I’m an attorney in Champaign-Urbana, Illinois, serving clients nationwide for intellectual property matters and in Illinois and Georgia for business formation and transactions.
For more information on intellectual property and business law, check out the other posts on this site, listen to my podcast “Spellbinding IP: Patent, Trademark, and Business Strategy” on all major podcast platforms (video available on YouTube, Spotify, and Substack), or follow me on social media at @kingpatentlaw.
Disclaimer: This content is for informational and educational purposes only. It is not legal advice and does not create an attorney-client relationship. Business entity law varies by state, and tax implications depend on your specific situation. For advice about your particular circumstances, consult with a licensed attorney and tax professional in your state.
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