The different types of LLCs fall along four axes: how many members own the company, how the IRS taxes it, who runs it day to day, and whether it fits one of a few specialized state-authorized variants. Every LLC gives you the same core benefit, a legal wall between business debts and personal assets, but the choices you make along those axes drive your tax bill, your filing calendar, and in some cases whether the liability shield holds up at all.
Single-Member LLC
A single-member LLC has one owner. By default, the IRS treats it as a “disregarded entity,” meaning the LLC itself files no separate income tax return. You report business income and expenses on your personal Form 1040 using Schedule C, the same way a sole proprietor would.1Internal Revenue Service. Single Member Limited Liability Companies
The simplicity comes at a price. Net earnings are subject to the 15.3% self-employment tax, which splits into 12.4% for Social Security and 2.9% for Medicare.2Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The Social Security portion applies only up to an annual wage base the IRS adjusts each year, and the taxable amount is 92.35% of your net earnings rather than the full figure.3Internal Revenue Service. Topic No. 554, Self-Employment Tax High earners also owe an additional 0.9% Medicare surtax above certain income thresholds.
One risk is worth flagging. Because you’re the only owner, courts are sometimes more willing to “pierce the veil” and treat the LLC as an extension of you personally. That typically happens when owners mix personal and business finances, skip basic formalities like keeping separate bank accounts, or fail to adequately fund the business. Clean separation between your personal accounts and the LLC’s is the single most important thing you can do to preserve the liability shield.
Multi-Member LLC
Two or more owners change the default tax picture. The IRS treats a multi-member LLC as a partnership, which files an informational return on Form 1065 but pays no income tax itself.4Internal Revenue Service. LLC Filing as a Corporation or Partnership Profits and losses pass through to each member according to ownership share, and every member receives a Schedule K-1 showing their portion of the earnings to report on their individual return.5Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income
Members pay self-employment tax on their distributive share, as a single-member owner would. The filing is more involved. Partnership returns are due March 15 for calendar-year filers, and the IRS penalizes late or missing K-1s. Adding members also raises allocation questions. Profits and losses don’t have to be split evenly, but whatever split you choose must be documented in the operating agreement and have economic substance under IRS rules.
LLC Taxed as an S-Corporation
Any LLC, with one member or many, can elect S-corporation treatment by filing Form 2553 with the IRS.6Internal Revenue Service. Instructions for Form 2553 The reason owners do this is self-employment tax savings. Instead of paying self-employment tax on the entire net income, an S-corp splits owner compensation in two: a salary paid through payroll (subject to employment taxes) and distributions of remaining profit (not subject to self-employment tax).
The catch is that the salary portion must represent “reasonable compensation” for the work you actually perform. No bright-line rules exist. Courts and the IRS look at factors like your training and experience, the time you devote to the business, what comparable businesses pay for similar work, and the company’s dividend history.7Internal Revenue Service. Fact Sheet 2008-25, S Corporation Compensation and Medical Insurance Issues Setting your salary artificially low to maximize distributions is the most common way owners get in trouble with this structure. The IRS can reclassify distributions as wages, adding back taxes, penalties, and interest.
Eligibility has hard limits beyond the familiar 100-shareholder cap. The LLC must be a domestic entity, all shareholders must be U.S. residents (individuals, certain trusts, or estates), it can have only one class of ownership interest, and it can’t be a bank, insurance company, or other restricted entity type.6Internal Revenue Service. Instructions for Form 2553 The business files Form 1120-S annually and still issues K-1s. It stays a pass-through for income tax purposes, so profits aren’t taxed at the entity level.
LLC Taxed as a C-Corporation
An LLC can also elect C-corporation treatment by filing Form 8832.8Internal Revenue Service. About Form 8832, Entity Classification Election This is a fundamentally different structure from the pass-through options. The LLC becomes a separate taxpaying entity that owes federal corporate income tax at a flat 21% rate on net earnings. When after-tax profits are distributed as dividends, members pay tax again on the dividends at their individual rates. That double layer of taxation is the well-known drawback.
Two reasons owners choose it anyway. First, C-corporation status lets the business retain earnings at the 21% corporate rate without passing income through to members who might face higher individual rates. Companies planning to reinvest heavily in growth sometimes find this cheaper overall. Second, C-corporations face none of the S-corp restrictions on shareholder count, shareholder type, or classes of stock, which makes this the only workable structure for businesses seeking venture capital or planning multiple rounds of outside investment.
There’s also a significant tax incentive for founders. Under Section 1202 of the Internal Revenue Code, shareholders who hold qualified small business stock in a C-corporation for at least three years may exclude a substantial portion of the gain when they sell. For stock acquired after July 2025, the exclusion can reach up to 100% of the gain, capped at the greater of $15 million or ten times the adjusted basis of the stock. This benefit is available only to C-corporations, not pass-through entities, which makes the election more attractive for startups expecting a large exit.
One tradeoff worth weighing against the C-corp election: pass-through LLCs may qualify for the Section 199A deduction, which lets eligible owners deduct up to 20% of qualified business income from their taxable income.9Office of the Law Revision Counsel. 26 U.S.C. 199A – Qualified Business Income The full deduction is available below an inflation-adjusted income threshold (roughly $190,000 for single filers and $380,000 for joint filers, with the exact amounts changing each year). Above those thresholds, limitations tied to W-2 wages and depreciable property kick in, and owners of specified service businesses like law, accounting, health care, and consulting face additional phase-outs. C-corporations don’t qualify for 199A at all, so the choice between pass-through and C-corp status often comes down to comparing that deduction against the corporate rate and potential Section 1202 benefits.
Member-Managed vs. Manager-Managed
Every LLC also picks a management style. In a member-managed LLC, all owners share authority over daily operations, and any member can typically bind the company to a contract. This is the default in most states and fits small businesses where every owner is actively involved.
A manager-managed LLC separates ownership from control. One or more designated managers handle operations while the remaining members are passive investors who vote only on major decisions such as selling the company or admitting new members. The manager can be a member or an outside hire. This structure matters most when you have investors who want returns without operational responsibility, or when the business needs professional management the owners can’t provide themselves.
The distinction isn’t just internal. Banks, landlords, and other counterparties will check your articles of organization or operating agreement to see who can sign for the LLC. Getting it wrong can create headaches ranging from rejected loan applications to contracts a member signed without actual authority.
Series LLC
A series LLC lets you create separate “cells” within a single parent LLC. Each cell can own distinct assets, carry its own liabilities, and even have different members. The appeal is liability isolation. If one cell gets sued, the assets held by the other cells should be protected. Real estate investors use this most often, holding each property in its own series rather than forming a separate LLC for each one.
Roughly twenty states and the District of Columbia currently authorize series LLC formation, including Delaware, Texas, Illinois, and Nevada. The unresolved risk is what happens when you operate across state lines. States without series LLC statutes haven’t necessarily agreed to honor the internal liability walls, and case law testing the question is limited. If your business operates in multiple states, the segregation you’re counting on could face a serious challenge in a jurisdiction that doesn’t recognize the structure.
Tax treatment adds another layer of complexity. The IRS hasn’t issued final guidance on whether each series should file as a separate entity or whether the parent files a single return. In practice, many tax advisors treat each series as its own entity for federal purposes, but this area remains genuinely unsettled.
Professional LLC (PLLC)
Many states require licensed professionals to form a professional LLC, often abbreviated PLLC, instead of a standard LLC. The covered professions vary by state but commonly include doctors, lawyers, accountants, architects, engineers, and psychologists. The core rule is that only individuals licensed in that profession can be members.
A PLLC protects members from the business’s general debts and from malpractice claims against other members. It does not protect you from your own malpractice. If you personally make an error that harms a client, the PLLC structure won’t shield your personal assets from that particular claim. The entity exists primarily to satisfy state licensing board requirements while giving the business the operational flexibility of an LLC.
Low-Profit LLC (L3C)
The L3C is a niche hybrid designed for ventures whose primary purpose is charitable, educational, or scientific, with profit as a secondary goal. Its main selling point is attracting program-related investments from private foundations, which face IRS restrictions on how they deploy their assets. The L3C structure signals that an investment qualifies under those rules.
Only a handful of states and territories recognize the L3C. For federal tax purposes, it’s treated like any other LLC, so the tax elections above still apply. The L3C remains uncommon, and its practical advantages over a standard LLC with a charitable mission statement are debated. Most foundations can make program-related investments in regular LLCs if the investment meets the substantive requirements.
A Note on “Foreign” LLCs
A foreign LLC isn’t a separate type. The label describes an LLC’s status in any state other than the one where it was formed. When your LLC does business outside its home state, that other state generally requires you to register there by filing for a certificate of authority. The definition of “doing business” varies, but common triggers include having a physical office, employing workers, or regularly conducting transactions in the state.
The consequences of skipping registration can be severe. An unregistered LLC may lose the ability to file lawsuits in that state’s courts, which means it can’t enforce contracts or collect debts there. Many states also impose financial penalties running into the thousands of dollars, and in some jurisdictions officers or managers can face personal liability for the failure to register.
Choosing Between the Types
In practice, three questions do most of the sorting. How many members will the business have? That decides whether you start from the single-member or multi-member default. What are the tax numbers at your expected income level? That drives the choice among default pass-through, S-corp election, and C-corp election. And is there anything about your industry (licensed profession, real estate portfolio, foundation funding, outside investors) that pushes you toward a specialty variant? Answer those three honestly and the type of LLC that fits usually becomes clear.