More than two thirds of all new business entities registered in the United States are limited liability companies. Not corporations, not partnerships: LLCs. The structure did not even exist nationally until the 1990s, and it now dominates because it solved a real problem, giving small business owners corporate-grade liability protection without corporate-grade paperwork or double taxation.
This guide explains what an LLC actually is, in plain language: how the liability shield works and where it fails, how the IRS treats LLC income, what the structure costs to create and maintain, the major LLC variants, and the honest cases where an LLC is the wrong tool.
The Definition, and How an LLC Actually Works
A limited liability company (LLC) is a business entity created under state law that legally exists separately from its owners. The company, not the owners personally, signs contracts, owns property, borrows money, and gets sued. Owners are called members, ownership shares are called membership interests, and the document that creates the entity is called the Articles of Organization, filed with a state agency, usually the Secretary of State.
Three design choices define the structure:
It is a creature of state law. There is no federal LLC. You form in a specific state, follow that state's statute, and pay that state's fees. An LLC formed in Ohio is an Ohio LLC; if it later operates in Michigan, it registers there as a foreign LLC. This is why choosing a formation state is a real decision.
It separates liability, not taxes. The entity shields personal assets from business creditors, but by default the IRS ignores it completely for income tax purposes. Profits land on the members' personal returns either way. Liability separation and tax separation are independent dials, which is precisely what makes the LLC flexible.
It runs on contract, not statute. Corporations must follow rigid statutory governance: boards, officers, annual meetings, minutes. An LLC's internal rules live in a private contract called the operating agreement, and members can arrange ownership, management, and profit splits almost any way they agree to.
What "Limited Liability" Actually Means, and Where It Fails
If the business cannot pay its debts or loses a lawsuit, creditors can take what the business owns: its bank account, equipment, receivables. What they generally cannot take is what you own personally: your house, personal savings, car, retirement accounts. Your losses are limited to what you put into the company. That is the entire meaning of "limited liability."
The shield is real. It is also narrower than most founders assume, and the exceptions matter more than the rule:
Six things the LLC shield does not protect you from
- Personal guarantees. Banks and landlords routinely require them from small LLCs. A guaranteed debt is your debt, entity or not.
- Your own wrongdoing. You always answer personally for your own negligence, malpractice, or fraud. The LLC protects you from the business's liabilities, not from your own conduct.
- Trust fund taxes. Payroll taxes withheld from employees and unremitted sales tax follow the responsible person individually.
- Commingling. Run personal spending through the business account and a court can "pierce the veil" and treat the LLC as your alter ego.
- Undercapitalization plus formality failures. An entity with no operating agreement, no records, and no real assets invites veil-piercing arguments.
- Administrative dissolution. Miss annual reports long enough and the state erases the entity, and the shield with it.
The practical lesson: the shield is not something you buy once at formation. It is something you maintain, with a separate bank account, an operating agreement, adequate insurance, and on-time state filings. Compliance monitoring exists to automate the last part.
How LLCs Are Taxed
By default, an LLC pays no federal income tax itself. The IRS classifies it based on its member count and taxes the owners directly:
| LLC type | Default IRS treatment | Where income is reported |
|---|---|---|
| Single-member LLC | Disregarded entity | Schedule C on the owner's Form 1040 |
| Multi-member LLC | Partnership | Form 1065 + Schedule K-1 to each member |
| LLC with S election | S corporation | Form 1120-S + K-1s; owner takes a salary |
| LLC with C election | C corporation | Form 1120; entity pays 21% corporate tax |
Active members also owe 15.3% self-employment tax on their share of profits, which is the number that eventually drives profitable LLCs toward the S-corp election: pay yourself a reasonable salary, and the remaining distributions escape self-employment tax. The full picture, including state-level franchise taxes and quarterly estimates, is in our LLC taxes guide.
LLC vs the Other Structures
Every entity choice trades off protection, tax treatment, cost, and formality. The honest comparison:
Vs sole proprietorship. A sole proprietorship is free and automatic, and it offers zero liability protection. The moment the business has real revenue, contracts, or risk, the LLC's fee is cheap insurance. Full breakdown: LLC vs sole proprietorship.
Vs general partnership. A handshake partnership makes each partner personally liable for the other partner's business acts. A multi-member LLC provides the same pass-through taxation without that exposure.
Vs S corporation. "S corp" is a tax status, not an entity. An LLC can take the S election and get the same tax result with less governance. A statutory corporation with an S election makes sense mainly when investors or stock option plans are involved. See LLC vs S corporation.
Vs C corporation. Venture capital, stock options for employees, and eventual IPO plans all favor a Delaware C-corp. Everyone else pays double taxation for formality they do not need. See LLC vs C corporation.
Types of LLCs
Single-member LLC. One owner, disregarded for taxes, the most common entity in America. The shield holds only with clean separation of finances; details in the single-member guide.
Multi-member LLC. Two or more owners, partnership taxation, and an operating agreement that matters enormously because it governs money splits, authority, and exits.
Member-managed vs manager-managed. A governance choice made at filing: either every member can bind the company, or only designated managers can. Passive-investor deals choose manager-managed.
PLLC (professional LLC). Licensed professions (medicine, law, accounting, architecture) must use the professional variant in many states, and the shield never covers your own malpractice. See professional entities explained.
Series LLC. One parent LLC with internal "series," each holding assets walled off from the others. Available in about 20 states, popular for real estate portfolios, and treated inconsistently across state lines, so use with counsel.
Anonymous LLC. New Mexico, Wyoming, and Delaware do not put member names on the public record. Privacy from the public is not privacy from the IRS, banks, or courts. See anonymous LLCs.
Holding company LLC. An LLC that owns assets or other entities rather than operating a business, used to isolate valuable assets from operating risk.
What an LLC Costs
One-time state filing fees run from $35 (Montana) to $520 (Massachusetts); the median state charges about $130, and most fall between $50 and $200. The recurring costs matter more over a company's life: annual or biennial report fees in most states, California's $800 annual franchise tax, Delaware's $300 annual tax, and $100 to $300 per year for a registered agent if you use a commercial service. The complete picture for every state, including the fee table and the four expensive-state footnotes, is in our formation cornerstone and the state cost comparison tool.
How to Form an LLC (the Short Version)
The full process is eight steps and about a week: choose your state (home state for most founders), clear the name against the state database, appoint a registered agent, file the Articles of Organization with the state fee, adopt an operating agreement, get the free EIN from the IRS, obtain licenses, and open a dedicated bank account. Each step, with fees for all 50 states and the six most expensive mistakes, is covered in How to Start an LLC: The Complete Step-by-Step Guide.
When an LLC Is the Wrong Choice
Honesty requires the other side of the ledger. An LLC is usually the wrong tool when:
You are raising venture capital. Institutional investors want Delaware C-corp stock, preferred shares, and option pools. LLC membership interests complicate all three. Founders planning a priced round should incorporate, or expect to convert.
You are testing an idea with zero exposure. A weekend project with no revenue and no risk does not need $200 of state fees and an annual report obligation. Form when the business becomes real.
You want to retain earnings at scale. Pass-through taxation means you pay tax on profits whether or not you distribute them. Businesses reinvesting large profits sometimes prefer C-corp treatment at the 21% corporate rate.
Your profession restricts it. Some states bar licensed professionals from standard LLCs entirely; the PLLC or professional corporation is the required route.
Three Owners, Three LLCs: How the Structure Behaves in Practice
A Denver consultant operates through a properly maintained single-member LLC: separate bank account, operating agreement, contracts signed as the LLC. A client dispute becomes a $90,000 lawsuit. Settlement negotiations start and end with the LLC's assets: its account balance and receivables.
Outcome: Her house, savings, and retirement accounts never enter the conversation. The $50 formation fee did exactly what it promised.
A two-member LLC runs payroll from a personal account, pays the owner's car lease from business funds, and never adopts an operating agreement. When a vendor judgment exceeds business assets, the plaintiff argues alter ego, and the financial records make the case.
Outcome: The court disregards the entity. The same filing fee bought nothing, because the owners never treated the LLC as real.
An e-commerce LLC's profit stabilizes at $140,000. The owner keeps the LLC, files Form 2553, sets a defensible $75,000 salary, and takes the rest as distributions exempt from self-employment tax.
Outcome: Same entity, same shield, better math: the flexibility that makes the LLC the default chassis for a growing business.
A liability wall with a tax pass-through
The LLC gives a real business corporate-grade asset protection at small-business cost, with taxes that flow straight to your return. It rewards owners who maintain the separation and punishes those who treat it as a magic label. If your business has revenue, contracts, or risk, it is almost always the right first entity.
Frequently asked questions
What does LLC stand for?
LLC stands for limited liability company. It is a state-registered business entity that combines the liability protection of a corporation with the tax simplicity of a sole proprietorship or partnership. Owners are called members, and the entity is created by filing Articles of Organization with a state.
Is an LLC a corporation?
No. Corporations and LLCs are separate entity types with different statutes, documents, and governance. A corporation has shareholders, directors, and bylaws; an LLC has members and an operating agreement. An LLC can elect to be taxed like a corporation without becoming one. See LLC vs C-corporation.
How is an LLC taxed?
By default the IRS ignores the entity: a single-member LLC reports on the owner's Schedule C, and a multi-member LLC files an informational Form 1065 with K-1s to members. Profits are taxed once, on personal returns, plus 15.3% self-employment tax on active income. LLCs may elect S-corp or C-corp treatment instead. See our LLC tax guide.
How much does an LLC cost?
State filing fees range from $35 (Montana) to $520 (Massachusetts); most states charge $50 to $200 one time. Recurring costs include annual report fees, franchise taxes in some states (California charges $800 per year), and a registered agent if you use one. Compare all 50 states in our cost comparison.
Does an LLC protect my personal assets?
Yes, when maintained properly. Creditors of the business generally cannot reach members' personal property. The shield does not cover personal guarantees you sign, your own professional malpractice or negligence, unpaid payroll taxes, or fraud, and courts can pierce the veil if you commingle funds or ignore formalities.
Can one person own an LLC?
Yes. Every state allows single-member LLCs, and they are the most common type in the country. A single-member LLC is taxed as a disregarded entity by default and still provides the liability shield, provided you keep business finances separate. See our single-member LLC guide.
Do I need an LLC if I have no revenue yet?
Not necessarily. A business with no revenue, no employees, and no liability exposure can operate as a sole proprietorship while testing an idea. Form the LLC before signing contracts, taking payments at scale, hiring, or doing anything that creates real liability. Our comparison guide covers the crossover point.
Ready to form your LLC?
Name check, Articles of Organization, operating agreement, EIN, and a year of registered agent service. State fee passed through at cost, same-day filing in most states, 60-day money-back guarantee.
