The short answer: A limited liability company (LLC) is a business entity formed under state law that protects its owners, called members, from the company’s debts. For federal tax it has no category of its own: by default a one-owner LLC is taxed like a sole proprietorship and a multi-owner LLC like a partnership, so profit passes through to the members’ returns. An LLC can elect to be taxed as an S corporation or a C corporation instead, and its operating agreement sets almost everything else.
The LLC is the most popular business structure in the United States because it combines the liability shield of a corporation with the tax flexibility of a partnership. But that flexibility cuts both ways.
Key takeaways
- Liability shield: members generally risk only what they put in, not their personal assets.
- Pass-through by default: profit is taxed once, on the members’ returns, even if it stays in the business.
- A tax menu: an LLC can elect S corp tax (Form 2553) or C corp tax (Form 8832).
- Set by contract: the operating agreement decides management, profit splits and exits.
- Equity without stock: profits interests can give key people a tax-free stake in future growth; ISOs are not available.
- Foreign owners: a foreign-owned single-member LLC files Form 5472 every year.
What an LLC Actually Is
A limited liability company is a legal entity formed under state law that separates the business’s assets and obligations from the personal assets of its owners. The owners are called members, and their stakes are called membership interests or units rather than shares of stock.
The easiest way to understand an LLC is as a hybrid. From the corporation, it borrows the liability shield: if the business is sued or cannot pay its debts, creditors generally pursue the company’s assets, not the members’ homes or savings. From the partnership, it borrows pass-through taxation: by default, the LLC itself pays no federal income tax. Profit and loss flow through to the members, who report their shares on their own returns.
One more feature sets the LLC apart from both: almost everything about how it operates is contractual. The operating agreement, the internal document the members sign, decides who manages the company, how profits are split, what happens when a member leaves, and how new members join. Two LLCs with identical state filings can work in completely different ways because their operating agreements say different things.
Worked example: three friends start a design studio as an LLC. Each contributes the same cash, but they agree to split profits 50/30/20 because one works full-time and the others part-time. A corporation would struggle to do this without creating separate share classes; an LLC does it with a paragraph in the operating agreement.
How the Liability Shield Works, and How It Breaks
- Mixing funds. Paying personal expenses from the business account, or the other way round, is the classic mistake. Keep separate bank accounts and clean books from day one.
- Personal guarantees. Lenders and landlords often ask members to personally guarantee loans or leases. A guarantee gives up the shield for that obligation.
- Personal wrongdoing. The LLC does not protect a member from liability for their own negligence or fraud. It protects you from the business’s obligations, not from your own conduct.
- Undercapitalization and missed formalities. Running the company with no realistic capital, or ignoring required state filings, gives a court reasons to look through the entity.
- Unpaid payroll taxes. Income and FICA tax withheld from employees can be assessed personally against the members responsible for paying it, whatever the entity type.
The Main Types of LLCs
All LLCs share the same basic design, but they come in several configurations. The right one depends on how many owners there are, what the business does and who runs it day to day.
Single-Member LLC
An LLC with one owner. For federal income tax it is a disregarded entity by default: the IRS ignores it, and the owner reports the business on their personal return as if it were a sole proprietorship. The liability shield is fully intact under state law. For payroll and certain excise taxes, though, the IRS treats it as a separate entity, so it uses its own EIN for those. See our single-member LLC guide.
Multi-Member LLC
Member-Managed vs. Manager-Managed
This is a management choice rather than a separate entity type, but it matters. In a member-managed LLC, every owner has authority to act for the company, which suits a two-person business but is risky with passive investors. In a manager-managed LLC, the members appoint one or more managers, who may or may not be members, to run operations, and the other members step back into an investor role.
Professional LLC (PLLC)
Many states require licensed professionals such as physicians, attorneys, accountants and architects to use a professional LLC instead of a standard one. A PLLC shields members from the business’s general obligations, but no structure shields a professional from liability for their own malpractice.
Series LLC
Available in a minority of states, a series LLC is a single parent entity that can create internal cells, called series, each with its own assets, members and liabilities, walled off from the others. Real estate investors use them to hold each property in its own series without forming a separate LLC for each. The structure is not recognized the same way in every state, so get legal advice before relying on the internal walls.
Domestic vs. Foreign LLC
Here “foreign” means out of state, not out of the country. An LLC is domestic in the state where it was formed and foreign in every other state where it registers to do business. If you form in one state and operate in another, expect to register as a foreign LLC there and pay that state’s fees too.
How LLCs Are Taxed: The Default and the Elections
The most misunderstood fact about LLCs is that the IRS has no LLC tax category. An LLC is created by state law, and federal tax law simply asks which existing category it fits into. That gives an LLC something no corporation has: a choice.
| Tax treatment | Who it applies to | How profit is taxed |
|---|---|---|
| Disregarded entity (default) | Single-member LLCs | Reported on the owner's personal return (Schedule C), like a sole proprietorship; profit generally bears self-employment tax |
| Partnership (default) | Multi-member LLCs | The LLC files Form 1065; each member reports their share from a Schedule K-1 on their own return |
| S corporation (by election, Form 2553) | Eligible LLCs: up to 100 owners, all US citizens or residents, one class of ownership | Pass-through; working owners take a reasonable salary through payroll, and the remaining profit is distributed without self-employment tax |
| C corporation (by election, Form 8832) | Any LLC | The LLC pays 21% corporate tax; owners pay tax again on dividends |
The Default: Pass-Through
Under the default rules, the LLC’s profit lands on the members’ personal returns whether or not any cash was distributed. This surprises new owners every year: if the company earns a profit and reinvests every dollar, the members still owe tax on their shares. Well-run LLCs plan tax distributions, cash paid out so members can cover the tax on profit allocated to them.
Worked example: two members own an LLC 60/40. It earns $100,000 of profit and keeps all of it to fund growth. At tax time, the 60% member reports $60,000 of income and the 40% member reports $40,000, even though neither received any cash.
The Self-Employment Tax Catch
For a default-taxed LLC, an active member’s share of profit is generally subject to 15.3% self-employment tax, the equivalent of both halves of Social Security and Medicare, on top of income tax. This is the cost of pass-through simplicity, and it is the main reason profitable LLCs consider the S corporation election.
The S Corporation Election
The C Corporation Election
Don't Forget the State Layer
Federal pass-through does not mean tax-free at the state level. Several states charge yearly franchise taxes, gross receipts taxes or flat LLC fees regardless of profit, and a few, including New York City and the District of Columbia, do not follow the federal S election. Both the state where you form and the states where you operate matter.
Worked example: an LLC formed in Delaware but run from California pays Delaware’s $300 yearly LLC tax and also registers in California, where it pays the $800 minimum yearly LLC tax plus an extra fee once its California income reaches $250,000, even in a year with a loss.
Foreign-Owned LLCs
Not sure which tax treatment suits your LLC?
Book a free 30-minute call with a Countsure CPA to compare the default treatment with an S or C corporation election on your own numbers.
Equity in an LLC: How Owners and Employees Hold a Stake
Corporations issue stock; LLCs issue whatever the operating agreement says. That freedom produces several distinct instruments, and the differences between them are mostly tax differences.
Membership Units (Capital Interests)
The basic ownership unit of an LLC, comparable to common shares of a corporation. A capital interest entitles the holder to a slice of everything the company is worth today plus future growth. Granting a capital interest to someone for their services is generally taxable to the recipient, because they have received something of present value. That is why the next instrument exists.
Profits Interests
The profits interest is the LLC’s answer to the stock option, and often a better deal for the holder. It gives a share of the value the company creates after the grant date, but no claim on the value that existed before it. The mechanism is a liquidation threshold: the company’s value on the grant date is recorded, and the holder shares only in proceeds above that line.
Worked example: an LLC worth $2 million grants a key employee a 5% profits interest with a $2 million threshold. Years later the company sells for $10 million. The first $2 million belongs to the existing members; the employee’s 5% applies to the $8 million of growth and pays $400,000. Had the company sold for exactly $2 million, the employee would receive nothing.
Under IRS guidance in Rev. Proc. 93-27 and Rev. Proc. 2001-43, a properly structured profits interest can be received tax-free, with the potential for long-term capital gain on the eventual payout. The safe harbor does not apply if the interest relates to a predictable income stream or is sold within two years, and holders of unvested interests often file a protective 83(b) election. The key fact is the threshold: it must be at or above the company’s fair market value on the grant date. Set it too low and the holder has effectively received existing value, which puts the tax-free treatment at risk. A supportable valuation, following Revenue Ruling 59-60, is what sets the line.
What LLCs Cannot Grant
The Hidden Cost: Every Member Gets a K-1
Granting real equity in an LLC makes the recipient a partner for tax purposes. That means a Schedule K-1 every year, possible state filings in every state where the company operates, and changes to how the person is paid, because partners generally cannot also be W-2 employees of the same partnership. Companies planning broad employee ownership often weigh this administrative cost against the tax advantages of profits interests, and some choose phantom equity or convert to a corporation instead.
LLC vs. Corporation: A Practical Comparison
| LLC | C corporation | |
|---|---|---|
| Owners | Members holding units; classes set by the operating agreement | Shareholders holding stock; classes set in the charter |
| Default federal tax | Pass-through (disregarded or partnership); no entity-level income tax | 21% corporate tax; dividends taxed again to shareholders |
| Profit splits | Set by contract; can differ from ownership percentages | Generally in proportion to shares within each class |
| Equity compensation | Profits interests, unit options, phantom equity; no ISOs | ISOs, NSOs and RSUs, the standard startup toolkit |
| Venture capital | Most institutional funds will not invest in pass-throughs; conversion usually required | The expected structure for VC-backed companies |
| Formalities | Light; no required board or annual meetings in most states | Board, bylaws, minutes and annual meetings |
| Yearly paperwork | Form 1065 and a K-1 for every member (multi-member) | Form 1120; W-2s and 1099-DIVs, no K-1s |
Advantages and Trade-Offs
Why Owners Choose the LLC
- One layer of tax by default. Profit is taxed once, at the member level, rather than at the entity and again on dividends.
- The qualified business income deduction. Eligible members can deduct up to 20% of their share of qualified business income, a deduction made permanent in 2025.
- Contractual flexibility. Profit splits, management rights and exit terms are whatever the members agree in writing.
- Losses can flow through. Within basis and other limits, early losses may offset members’ other income, which a C corporation’s losses cannot do.
- Light formalities. No required board meetings or minutes in most states, though good records still help protect the liability shield.
- Profits interests. A tax-efficient way to give key people a stake in future growth.
Where the Structure Costs You
- Self-employment tax on active members. Pass-through profit for working owners generally bears employment taxes that corporate dividends do not.
- Tax on phantom income. Members owe tax on allocated profit even when no cash is distributed.
- K-1 complexity. Partnership returns are harder than corporate ones, every new member adds filings, and Form 1065 is due March 15. Filing late costs $260 per member per month for returns due in 2027.
- Fundraising friction. Institutional venture investors generally require a C corporation, forcing a conversion at the moment the company is busiest.
- State-level costs. Yearly franchise taxes and fees apply in several states whether or not the LLC makes a profit.
How to Form an LLC, Step by Step
Forming an LLC is simple, which is part of why the structure is so popular. The steps below are the common path; details vary by state.
- Choose the formation state. Most small businesses should form where they actually operate; forming elsewhere usually just adds a foreign registration and a second set of fees.
- Name the company and appoint a registered agent. The name must be distinguishable in your state’s records, and the registered agent is the official address for legal notices.
- File the formation document. Called articles of organization or a certificate of formation depending on the state, filed with the secretary of state for a fee.
- Draft the operating agreement. Even single-member LLCs should have one. It shows the entity is real and governs everything the state statute leaves open.
- Get an EIN and open a business bank account. The EIN is free from the IRS, and the separate account is the first line of defense for the liability shield.
- Decide the tax classification. Accept the default, or file Form 2553 or Form 8832 if the numbers support it, ideally with a CPA.
- Register where you operate and stay current. Foreign registrations, annual reports, franchise taxes and any required licenses keep the company in good standing. US-formed LLCs no longer file beneficial ownership (BOI) reports with FinCEN since its March 2025 rule.
Our US company registration service handles formation, the EIN and registered agent, and our registration FAQs answer the common questions.
Choosing a Structure or Weighing a Tax Election? Get It Right the First Time.
Countsure’s CPA-led team helps owners think through entity choice, tax classification elections and the filings that follow, so the structure you pick today still works when the business grows.
Frequently Asked Questions
1. What does an LLC actually protect me from?
It protects your personal assets from the business’s debts and liabilities: a lawsuit against the company, a lease it cannot pay, a loan it defaults on. It does not protect you from your own negligence or fraud, from obligations you personally guaranteed, or from payroll taxes withheld from employees, which can be assessed personally against the people responsible.
2. Does an LLC pay its own taxes?
By default, no federal income tax at the entity level. A single-member LLC is reported on the owner’s return, and a multi-member LLC files Form 1065 with profit flowing to members on K-1s. The LLC can elect S or C corporation tax, which changes this, and several states charge LLCs franchise taxes or fees whatever the federal treatment.
3. What is the difference between a profits interest and a stock option?
Both give the holder a stake in growth above a baseline. A stock option requires the holder to pay an exercise price to buy shares; a profits interest requires no purchase, and the holder shares only in value above the liquidation threshold. Properly structured, a profits interest can be received tax-free, provided the threshold is set at or above the company’s fair market value on the grant date.
4. Can an LLC grant ISOs to employees?
No. Incentive stock options exist only for corporate stock, so an LLC taxed as a partnership cannot grant them and never files Form 3921. The closest equivalents are profits interests and unit options, or phantom equity if the company does not want to make employees partners.
5. Why do venture investors want a C corporation instead of an LLC?
Institutional funds generally cannot or will not hold pass-through interests: K-1s create tax problems for their own investors, and the venture toolkit of preferred stock, ISOs and qualified small business stock is built on corporate stock. LLCs raising institutional capital usually convert, and the company’s value at conversion becomes the baseline for the new equity.
6. Should I form an LLC or stay a sole proprietor?
A sole proprietorship costs nothing to keep up but leaves your personal assets exposed to every business obligation. Once the business signs contracts, takes on debt, hires anyone or serves customers who could sue, the LLC’s liability shield usually justifies the modest formation and yearly costs. For federal tax, a single-member LLC is treated like a sole proprietorship by default, so the decision is about protection, not tax.
7. Can a non-US person own an LLC?
Yes. There is no citizenship or residency requirement. A single-member LLC owned by a foreign person must file Form 5472 with a pro forma Form 1120 every year, even with no income, and the penalty for missing it is $25,000. A foreign-owned LLC cannot elect S corporation tax.
8. How do I change how my LLC is taxed?
File Form 2553 to be taxed as an S corporation, or Form 8832 to be taxed as a C corporation. After changing classification on Form 8832, an LLC generally cannot change it again for 60 months. Timing and eligibility rules apply, so review the numbers with a CPA first.
Other Related Services
- Single-Member LLC Guide: how a one-owner LLC is taxed.
- Multi-Member LLC Guide: partnership tax, Form 1065 and K-1s.
- What Is an S Corporation?: when the S election pays off.
- How to Form a C Corp: incorporation steps and yearly filings.
Parth Shah, Managing Director
(CPA-US, FCA, RV-S&FA, DISA)
Parth Shah who is head of Accounts and Book keeping has experience of more than 10 years. A Certified Public Accountant – US, fellow Chartered Accountant, Registered Valuer and Diploma in Information System Audit.
