What is an LLC? The plain-English guide (2026)

The short version

That is the "limited liability" part. The "company" part is that, unlike a corporation, the LLC is not locked into a single tax treatment. The IRS does not recognize the LLC as its own tax category at all. Instead, it asks: how many owners does it have, and has it elected something? Then it taxes it like a sole proprietorship, a partnership, an S corporation, or a C corporation — whichever fits.

This guide walks through what an LLC is, what protection it actually gives you, how the IRS sees it, and when it is — or isn't — the right choice.

The legal structure

An LLC is created by filing Articles of Organization (sometimes called a Certificate of Formation or Certificate of Organization, depending on the state) with the state's business registry. Every U.S. state recognizes LLCs; the statute that governs them varies state by state but most trace back to the Uniform Limited Liability Company Act and the well-developed Delaware LLC Act.

Once filed, the LLC exists. The owners are called members. Unlike a corporation, there are no directors, officers, or shareholders by default — just members, who can choose to run the company themselves (a "member-managed" LLC) or appoint managers (a "manager-managed" LLC).

The internal rulebook is called an operating agreement. Most states do not require you to file it with the state and most do not require you to have one at all — but you should. An operating agreement sets out who owns what percentage, who can make decisions, how profits are split, and what happens if a member dies, quits, or wants out. Without one, the state's default statute fills in the blanks, and those defaults are rarely what you actually want.

What "limited liability" really buys you

The headline benefit is that the LLC puts a wall between business debts and your personal assets. If the company is sued, creditors get to come after the company's bank account, equipment, and accounts receivable — not your house, your car, or your retirement savings.

That wall is real, but it is not absolute. Courts will pierce the corporate veil — disregard the LLC and go after you personally — if the LLC is a sham. The most common reasons:

• You commingled personal and business money (paid personal rent out of the business account).
• You didn't follow basic formalities (no operating agreement, no separate books).
• You were undercapitalized on purpose to dodge a foreseeable liability.
• You signed a personal guarantee on the debt the plaintiff is now collecting.

The LLC also does nothing to protect you from your own torts. If you, personally, drive the company truck into someone, you are personally liable. The LLC protects the members from each other's wrongdoing and from the company's contracts — it does not protect you from what you yourself did.

How the IRS taxes an LLC

This is where LLCs get interesting. Per IRS Publication 3402, Taxation of Limited Liability Companies, the IRS assigns a default tax treatment based on the number of members, and lets the LLC override that default by filing Form 8832 (or, for S-corp election, Form 2553).

The four possible tax treatments:

1. Single-member LLC → disregarded entity (default). The LLC is invisible for federal income tax purposes. Its income, expenses, and deductions show up on your personal Schedule C, just as if you were a sole proprietor. You file one tax return. You owe self-employment tax on the net profit.

2. Multi-member LLC → partnership (default). The LLC files a Form 1065 partnership return and issues each member a K-1 showing their share of income. The partnership itself pays no tax; the members report the K-1 figures on their personal returns. Active members owe self-employment tax on their share of ordinary income.

3. LLC electing S-corp treatment. The LLC files Form 1120-S and issues K-1s. The key difference from partnership taxation: S-corp distributions are not subject to self-employment tax. In exchange, any member who works for the LLC must be paid a "reasonable" W-2 salary, and payroll tax applies to that salary. This can save money once profits are high enough; below that threshold, it adds complexity for no gain. We cover the math in LLC vs S-Corp.

4. LLC electing C-corp treatment. The LLC files Form 1120 and is taxed as a separate entity at the federal corporate rate — 21% flat, unchanged since the Tax Cuts and Jobs Act of 2017. Distributions to members are taxed again as dividends. This is rare for operating LLCs but relevant for startups planning to raise venture capital or pursue QSBS treatment.

You do not pick the treatment when you file the LLC with the state. You pick it separately with the IRS — or take the default and move on.

The self-employment tax trap

For most new single-member LLCs, the tax bill looks like this on 2026 numbers:

• Federal ordinary income tax at your personal rate — 10% to 37% depending on bracket.
• Self-employment tax of 15.3% on net earnings up to the Social Security wage base. Social Security is 12.4% of the first $184,500 of self-employment income (2026 figure, per the Social Security Administration). Medicare is 2.9% with no cap.
• Additional Medicare tax of 0.9% on self-employment earnings above $200,000 single / $250,000 married filing jointly, per IRS Topic 560.
• State income tax, if your state has one.

The self-employment tax is the surprise. A W-2 employee and their employer each pay half of FICA; a self-employed LLC member pays both halves. The deductible half of SE tax and the Section 199A qualified business income deduction (up to 20% of pass-through income, made permanent by the One Big Beautiful Bill Act of 2025) soften the blow, but the 15.3% line is why some LLC owners eventually switch to an S-corp election.

When an LLC is the right choice

An LLC is a good default when you want:

• Personal asset protection. Anything beyond a hobby that generates income, has customers, or signs contracts benefits from the liability wall.
• Flexible ownership. Members can split profits unevenly, issue different classes of membership interest, admit and remove members by agreement.
• Pass-through taxation. Profits are taxed once, at the member's personal rate, and qualify for the 20% QBI deduction for most trades.
• Light administrative overhead. Compared to a C-corp, an LLC avoids board meetings, stock certificates, bylaws, and a separate corporate tax return.

An LLC is the wrong choice — or at least a premature one — if:

• You plan to raise venture capital. VCs will require you to convert to a Delaware C-corp. Starting there saves the conversion cost.
• You want to issue incentive stock options (ISOs). ISOs are a corporate-only instrument. LLCs use profits interests instead, which work but are more complex.
• Your business activity is a regulated profession and your state restricts LLC formation for lawyers, doctors, accountants, or architects. Most of those states require a Professional Limited Liability Company (PLLC) instead.

What an LLC actually costs

The costs break into three buckets:

Formation. State filing fee, paid once. Ranges from $40 (Kentucky) to $500 (Massachusetts), with most states between $100 and $200. Some states (New York, Arizona, Nebraska) also require you to publish notice of formation in a newspaper, adding a few hundred dollars.

Ongoing. Most states require an annual or biennial report. Fees range from $0 (a handful of states charge nothing) to $800 (California's annual franchise tax minimum). States without an annual report often have a separate "privilege tax" or "franchise tax" that accomplishes the same revenue goal.

Registered agent. Every state requires an LLC to have a registered agent — a person or company at a physical address in the state where legal papers can be served. You can be your own agent if you live there, or hire a commercial provider for $50–$200/year.

Single-state vs multi-state

Most founders form the LLC in the state where they actually live and work. That is almost always the right answer. Forming in a "better" state (Wyoming, Delaware, Nevada) and then doing business in your home state means you also have to register as a foreign LLC back home — which means two state filings, two annual reports, two registered agents, and the same tax bill. The arbitrage rarely survives contact with the math.

Forming elsewhere makes sense when (a) you actually operate in that state, (b) you are holding real property in that state, or (c) you are running a remote-first business with no physical nexus anywhere and want the privacy of a state like Wyoming or New Mexico.

Frequently asked

Do I need a lawyer to form an LLC? No. The state forms are short and the Secretary of State will process them without legal review. A lawyer becomes useful if you have multiple members, outside investment, a complicated profit split, or you are in a regulated industry.

What is an EIN and do I need one? The Employer Identification Number is the LLC's federal tax ID. You need one if the LLC has employees, has more than one member, or elects corporate taxation. Single-member LLCs with no employees can use the owner's Social Security Number, but most banks will require an EIN to open a business account. It is free from the IRS.

Do I have to pay myself a salary? Not if the LLC is taxed as a sole proprietorship or partnership — you take owner's draws, which are not wages. If the LLC has elected S-corp or C-corp treatment and you actively work in the business, the IRS requires "reasonable compensation" paid through payroll.

Can an LLC own another LLC? Yes. This is the basis of the "holding company" structure — a parent LLC owns one or more operating LLCs, isolating liability from each operating business. The parent is usually taxed as a partnership if it has multiple members.

What happens if I just stop filing the annual report? The state will mark the LLC as "not in good standing" after a grace period, and eventually administratively dissolve it. During the delinquency window, you lose the liability shield — you can be treated as personally liable for business obligations. Reinstatement is usually possible but always more expensive than staying current.

Can I convert an LLC to a corporation later? Yes, and it is common. Most states allow a statutory conversion that transforms the LLC into a corporation without liquidating it or changing its EIN. The tax side is an F-reorganization or similar, and is typically not a taxable event when done properly.

Bottom line

An LLC is the plainest, most flexible legal wrapper American business law offers. It gives you a liability shield, lets you pick your tax treatment, and stays out of your way. For most small businesses, solo consultants, and early-stage founders who are not immediately chasing venture capital, it is the right first entity.

The mistakes that trip people up are not forming one (the process is easy) but running one loosely — commingling funds, skipping the operating agreement, missing the annual report. The wrapper works only if you treat it like a real, separate thing.

Sources

• IRS Publication 3402, Taxation of Limited Liability Companies
• IRS — Limited Liability Company (LLC)
• IRS — Single-member limited liability companies
• IRS — LLC filing as a corporation or partnership (Form 8832)
• IRS Topic 560, Additional Medicare Tax
• IRS — 2026 tax inflation adjustments
• Social Security Administration — Contribution and Benefit Base
• Delaware Limited Liability Company Act, Title 6, Chapter 18