Sole proprietorship, LLC, S-Corp, C-Corp, or partnership — the structure you choose affects your taxes, personal liability, and how you can raise money. Here is how each one works.
Your business structure is the legal shape your company takes, and it quietly controls three things every single day you're in business: who's on the hook if something goes wrong, how much tax you pay, and how you're allowed to raise money.
Most new owners pick a structure once, in a rush, while they're busy actually building the business. Priya started selling candles at weekend markets under her own name because it was the fastest way to get a table set up. She didn't think about "business structure" at all, she just started selling. That's usually fine at first, but it means a lot of people are stuck with a structure that no longer fits once they're a few years in. Six months later, Priya was shipping wholesale orders to three boutiques and had a part time helper mixing wax. The sole proprietorship she'd never chosen on purpose was now carrying real risk (a spilled batch of hot wax, a shipping mistake, an employee's mistake) directly against her personal savings account. This module walks through the real tradeoffs so you can make the call on purpose, not by accident.
There are five common structures: sole proprietorship, partnership, LLC, S-Corp, and C-Corp. They're not five totally different things, think of them more like a ladder. Sole prop and partnership are the default if you do nothing. LLC adds a legal shield. S-Corp and C-Corp are tax and ownership elections you can layer on top of an LLC (or a corporation) once your business is bigger. You'll see how that ladder works in the comparison below.
Why this matters practically: the cost of picking the wrong structure isn't usually the structure itself, it's the delay. Every month you operate unprotected is a month a single bad order, a single unhappy client, or a single workplace accident could reach your house, your car, and your personal savings. The good news is that fixing it is rarely dramatic. Most of this module is about knowing when to act, not just what the options are.
Before comparing structures, it's worth answering a more basic question: why register anything in the first place? A sole proprietorship costs nothing and requires no paperwork, it's what you're already operating as the moment you start doing business under your own name. Priya, in the example above, was a sole proprietorship from her very first market sale, whether she realized it or not. So what do you actually gain by filing paperwork, paying a fee, and taking on more admin?
The honest answer: several concrete, practical things that have nothing to do with which structure you eventually pick. When Priya finally sat down to register her candle business as an LLC, the change she noticed first wasn't the liability shield, it was that a regional gift shop chain would finally sign a wholesale contract with "Amber Row Candles LLC" when it had waved off "Priya Shah, individual seller" for months. The paperwork wasn't just legal protection, it was the thing that let her business look like a business to the people she wanted to sell to.
What changes when you register, vs. staying an unregistered sole proprietor
| Staying unregistered (sole prop default) | Once you register (LLC or corporation) | |
|---|---|---|
| Liability protection | None: a lawsuit or unpaid business debt can come after your personal house, car, and savings | Your personal assets are generally shielded from business debts and lawsuits |
| Business bank account | Banks will usually still let you open one, but you're mixing business and personal money by default unless you're disciplined | You can (and for an LLC or corp, must) open a dedicated account. This is what actually makes your liability shield hold up, and makes bookkeeping and taxes dramatically simpler |
Here's the short version of each, side by side. "Liability" means: if the business gets sued or can't pay a debt, can a creditor come after your personal house, car, and savings, or only what's inside the business?
Notice the pattern moving down the table: liability protection and tax simplicity trade against each other as you move from sole proprietorship toward C-Corp. A sole proprietorship is the simplest possible tax situation (one return, profit flows straight to you) and the weakest possible protection (nothing separates you from the business). A C-Corp is the reverse: the strongest protection and the most formal, most expensive tax and paperwork burden. Most small businesses land somewhere in the middle, on an LLC, because it's the first point on the ladder where you get real liability protection without also taking on a board of directors and double taxation.
Five common business structures, compared
| Liability protection | How it's taxed | Cost and paperwork | Best for | |
|---|---|---|---|---|
| Sole Proprietorship | None: you and the business are legally the same | Pass-through: profit is taxed on your personal return | Free, no filing. This is the default if you do nothing | Testing an idea, very low risk side work |
| Partnership | None (general partnership): each partner can be liable for the other's actions | Pass-through, split among partners by agreement |
If an LLC is the right call for you, here's the actual process. It's more paperwork than a sole proprietorship, but it's not complicated, most people finish this checklist in a few hours spread over a week or two while the state processes your filing.
James and his co-founder used this exact sequence when they formed the LLC behind their two-person landscaping business. The whole thing, from name search to funded bank account, took them eleven days, and the slowest step by far was waiting on the state to process the Articles of Organization, not anything they had to figure out themselves.
LLC Formation Checklist
0/6How This Varies by State
Every state lets you form an LLC, and the core process above is the same everywhere, but the specifics of cost, deadlines, and ongoing requirements are set entirely by each state, not the federal government. What's cheap and simple in one state can be expensive and paperwork heavy in another (a handful of states, for example, charge a flat annual franchise tax on every LLC regardless of whether it made any money).
What varies by state
Elena spent her first year building a workout app as an LLC, splitting profit with her two co-founders the way most bootstrapped teams do. When a seed-stage venture fund offered a term sheet, the fund's lawyers came back with a condition before a dollar would move: the company had to reincorporate as a Delaware C-Corp first. This wasn't a red flag about the specific investor, it's close to universal, and it's worth understanding before you're the one scrambling to convert mid-negotiation.
Planning to raise venture capital? Read this first.
If you already know you're going to raise money from institutional investors (venture capital or private equity funds, not friends and family), most of them will require you to be a Delaware C-Corp before they'll invest, regardless of where your business actually operates. This is standard practice, not a red flag from any one investor: Delaware's corporate law is well established and predictable, and VCs standardize on it so their lawyers don't have to re-learn a different state's rules for every deal.
If this is your situation, it's usually worth incorporating as a Delaware C-Corp from day one rather than forming an LLC and converting later. Conversions are doable, Elena's team closed theirs in about six weeks, but they add legal cost and complexity at exactly the moment you're trying to close a round. Module 3 goes deep on the vocabulary and mechanics of VC and PE fundraising if you want the fuller picture before deciding.
If you're not planning to raise institutional money, none of this applies to you, an LLC (with or without an S-Corp election) is simpler, cheaper, and works fine for a business funded by revenue, savings, or a bank loan.
Every structure above has a real downside, not just an upside, the comparison table shows what you gain, but picking one on upside alone is how people end up stuck with the wrong fit. Here's what actually goes wrong with each.
Sole proprietorship: zero liability protection is the obvious one, but it also makes it harder to bring on a partner or raise any outside money later, there's no "shares" to sell, just you. Some banks and vendors also simply won't extend credit or net-30 terms to an unregistered individual.
Partnership (general): each partner can be held personally liable for the other partners' actions and debts, not just their own, this is the single most underestimated risk of an informal partnership. Two friends who launch a catering business on a handshake, for instance, are each personally on the hook if the other signs a bad supplier contract, even without knowing about it. Without a strong, specific partnership agreement, a disagreement about money or direction can become a legal mess with no clear resolution process.
LLC: every dollar of profit is subject to self-employment tax by default (see Module 2) unless you elect S-Corp treatment, which brings its own downsides, below. Some states charge a meaningful annual franchise tax or LLC fee regardless of whether the business made any money (see the state law section above). And most institutional investors won't invest directly in an LLC at all, see the C-Corp section above.
S-Corp election: several real constraints, not just the audit risk of the reasonable salary rule covered earlier. Shareholders must be U.S. citizens or residents (or certain trusts and estates), not other companies, not partnerships, and not non-U.S. investors, which alone disqualifies most venture capital funds as potential shareholders, since a VC fund is typically structured as a partnership or LLC. You also can't have more than one class of stock, meaning you can't give different investors different rights or economics like preferred stock with a liquidation preference, everyone's shares work the same way, which is a second, independent reason most VCs won't invest in an S-Corp. Profit and loss must be split strictly by ownership percentage: unlike an LLC's operating agreement, which can allocate profit however the members agree, an S-Corp can't give one owner a different profit split than their ownership percentage, even if that's what everyone actually wants. Payroll adds real cost and complexity too, you're now running an actual payroll system with all the compliance that comes with it, not just moving money between accounts. Trust ownership is time limited as well: a revocable living trust can hold S-Corp stock while you're alive with no issue, but once it becomes irrevocable, typically at your death, it's generally only an eligible shareholder for a two year grace period, after which the stock must be distributed to an eligible individual owner or the trust must convert to a Qualified Subchapter S Trust (QSST) or Electing Small Business Trust (ESBT) to keep holding it. (You may also hear a six month figure, that's a narrower rule for certain estates that filed a federal estate tax return, not the general trust situation.) This is genuinely intricate estate planning territory, work with an estate planning attorney if S-Corp stock is going to pass through a trust.
C-Corp: double taxation is the headline cost (see Module 2), but the formal overhead is real too, a board, bylaws, corporate minutes, and more filing requirements than any other structure. Losses also don't pass through to your personal tax return the way they would with an LLC or S-Corp, which matters if the business runs at a loss in its early years. For a small business not raising institutional money, a C-Corp is usually more structure than you need.
You've now seen the tradeoffs in detail. The tree below turns them into a quick, ordered set of questions, in the same order that actually matters: institutional fundraising plans first (because it overrides everything else), then ownership, then risk. Answer honestly rather than optimistically, "not sure yet" about liability risk is itself useful information.
Which Path Fits You?
Do you already know you'll raise money from venture capital or private equity investors?
Key Terms
Check your understanding
A freelance illustrator works solo, has no employees, carries no inventory, and is just testing whether her side project can become a real business. Based on the decision tree in this module, what structure fits best for now?
Why does a C-Corp face "double taxation" while an LLC or S-Corp generally does not?
A founder in one state pays a $0 initial LLC filing fee, while a friend forming an LLC in another state pays a $500 flat annual tax whether or not the business turns a profit. What explains this difference?
An LLC owner has been profitable for two years and now clears about $95,000 in net profit annually. What is the most useful next step this module suggests?
Ask a question about this lesson or share your take.
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| Credibility with vendors, customers, landlords | Some vendors and B2B customers won't open an account or sign a contract with an unregistered individual | A registered business name, EIN, and business bank account are often the minimum bar to be taken seriously as a vendor or get net-30 payment terms |
| Business credit and financing | Lenders generally underwrite you personally, not "the business," so it's hard to separate your business's risk from your own credit | Opens the door to building business credit and applying for business loans or lines of credit (see the SBA Loans module) tied to the business, not just you |
| Contracts and legal standing | You personally are the party to every contract, lease, and agreement | The business itself can sign contracts, hold a lease, own property, and be sued or bring a lawsuit in its own name |
| Licenses, permits and insurance | Some professional licenses and most business insurance policies require a registered business to apply | Meets the baseline requirement most licenses, permits, and business insurance policies expect |
You don't have to do it all at once
Even if you're not ready to form an LLC, getting a free EIN from the IRS and opening a business bank account as a sole proprietor is a nearly free first step that gets you real credibility and cleaner books, long before you need the liability protection an LLC provides. A lot of new owners skip this simply because no one told them it was an option short of full incorporation.
| Low cost, but you need a real partnership agreement |
| Two or more founders not ready to form an LLC yet |
| LLC | Yes: your personal assets are generally protected | Pass-through by default (can elect S-Corp taxation later) | State filing fee plus annual report, moderate paperwork | Most small businesses and solo founders |
| S-Corp | Yes (it's a tax election on top of an LLC or corporation, not a separate liability structure) | Pass-through, but can reduce self-employment tax, see the calculator below | More paperwork: payroll, reasonable salary rules | Profitable LLCs (typically $40,000 to $60,000+ net profit) |
| C-Corp | Yes: strongest, most established shield | Double taxation: the company pays tax, then you pay tax again on dividends | Most paperwork: board, bylaws, corporate formalities | Businesses planning to raise venture capital |
The S-Corp row is worth pausing on, because the potential savings are real but they only show up past a certain profit level. An S-Corp election lets an LLC owner split their income into a "reasonable salary" (subject to payroll tax, like any employee's wages) and remaining profit taken as a distribution (not subject to self-employment tax). Aisha ran a graphic design LLC that cleared about $110,000 in net profit her third year. As a default LLC, all $110,000 was subject to self-employment tax. After electing S-Corp status and setting her own reasonable salary at $58,000, only that salary portion was subject to payroll tax, and the remaining roughly $52,000 came out as a distribution instead. The tool below lets you run your own numbers the same way.
LLC vs. S-Corp: estimate your self-employment tax savings
Enter your expected annual net profit and a reasonable salary figure to see roughly how much an S-Corp election could save on self-employment tax versus staying a default LLC. This is a planning estimate, not a filing calculation, actual results depend on your state, your accountant's judgment on "reasonable," and current tax law.
Default LLC — SE tax
$16,955
On the full net profit
S-Corp — FICA on salary
$9,945
$55,000 paid as distributions, FICA-free
Estimated savings
$7,010
per year with S-Corp election
The most common path
Most founders start as a sole proprietorship by default, form an LLC once they have real revenue or any liability risk, then add an S-Corp election once they're consistently profitable. If they later raise venture capital, they convert to a Delaware C-Corp. You don't have to follow this path, but it's the one that fits the largest number of businesses, and it's why the decision tree below defaults to it.
Why the liability shield actually works, and why it can fail
Filing Articles of Organization does something specific under the law: it creates a separate legal "person." From that point on, your LLC can own things, owe things, and be sued in its own name, legally distinct from you, the same way a corporation or another human being is a distinct legal person. That separateness is the entire mechanism behind the liability shield: a creditor suing "the business" is suing that separate person, not you.
That's also exactly why commingling funds is so dangerous. The shield only works if the separation is real, not just paperwork. Diego ran a one-person landscaping LLC and, for over a year, paid his personal car loan directly from the business checking account because it was "easier to track." When a client sued the LLC after a retaining wall Diego built collapsed, the client's attorney pulled a year of bank statements and showed the court that the LLC's money and Diego's money were never actually separate. The court agreed, disregarded the LLC's separateness, and let the judgment reach Diego's personal accounts anyway. This is called "piercing the corporate veil," and it's the single most common way a real LLC still fails to protect its owner. The formation checklist above isn't a box-checking exercise, every step on it is something a court would look at to decide whether your LLC is genuinely separate from you in practice, not just on paper.
Checkpoint: liability shields
A solo LLC owner pays her personal phone bill from the business checking account every month because it's convenient, but otherwise keeps careful books. If her LLC is ever sued, what's the real risk here?
What is the one document on the LLC formation checklist that most states do not legally require you to file, but that this module says you should write anyway?
Before filing, search "[your state] Secretary of State LLC filing" to get the current fee schedule and requirements directly from the source, these details change and this module intentionally doesn't guess at numbers that might be wrong by the time you read this.
The eligibility rules aren't optional
Unlike most of the tradeoffs in this module, S-Corp shareholder eligibility isn't a matter of preference, if you violate one of these rules (even accidentally, like a trust holding stock past its grace period, or issuing what turns out to be a second class of stock), the IRS can terminate your S-Corp status retroactively. That's not a small paperwork problem, it can mean an unexpected C-Corp tax bill for years you thought you were pass-through. If your ownership situation involves a trust, multiple classes of interest, or any non-individual owner, get a professional to confirm S-Corp eligibility before you file the election, not after.
Checkpoint: structure downsides
A profitable LLC wants to bring on a venture capital fund as an investor and is considering an S-Corp election first to save on self-employment tax. What's wrong with this plan?
Two friends run a general partnership with no written partnership agreement. One of them signs a supplier contract the other never saw or approved. What happens?