The different types of LLCs mostly come down to four questions: how many owners are involved, how the IRS taxes the business, who runs it, and whether it fits a specialized state category like a series, professional, or low-profit LLC. Every version keeps the same core feature — a legal wall between business debts and your personal assets — but the tax bill, paperwork, and eligibility rules shift depending on which configuration you choose.
Single-Member LLC
A single-member LLC has one owner. The IRS treats it as a “disregarded entity” by default, so the LLC itself doesn’t file a separate income tax return. You report all 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 tradeoff for that simplicity is self-employment tax. Net earnings flow through to you and are subject to the 15.3% self-employment tax rate, which breaks down 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 actual taxable amount is 92.35% of your net earnings rather than the full total.3Internal Revenue Service. Topic No. 554, Self-Employment Tax High earners also owe an additional 0.9% Medicare surtax above certain income thresholds.
One vulnerability worth knowing about: because you’re the sole 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 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
When two or more people own an LLC together, the IRS defaults to treating it as a partnership. The LLC files an informational return on Form 1065 but doesn’t pay income tax itself.4Internal Revenue Service. LLC Filing as a Corporation or Partnership Profits and losses pass through to each member based on their ownership share. Every member receives a Schedule K-1 showing their portion of the earnings, which they report on their individual tax return.5Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income
Members pay self-employment tax on their distributive share, just as a single-member owner would. The filing is more complex than a single-member setup. Partnership returns have strict deadlines (March 15 for calendar-year filers), and the IRS imposes penalties for late or missing K-1s. Adding members also introduces allocation questions. Profits and losses don’t have to be split equally, but whatever split you choose needs to be documented in the operating agreement and must have economic substance under IRS rules.
LLC Taxed as an S-Corporation
Any LLC, regardless of how many members it has, can elect to be taxed as an S-corporation by filing Form 2553 with the IRS.6Internal Revenue Service. Instructions for Form 2553 The reason people do this comes down to self-employment tax savings. Instead of paying self-employment tax on the entire net income, an S-corp splits your compensation into two buckets: 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. There are no bright-line rules for what counts. 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 people get in trouble with this structure. The IRS can reclassify distributions as wages, tacking on back taxes, penalties, and interest.
Eligibility has several hard limits beyond the well-known 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 certain other restricted entity type.6Internal Revenue Service. Instructions for Form 2553 The business files Form 1120-S annually and still issues Schedule K-1s to each member. It remains a pass-through entity 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 above. The LLC becomes a separate taxpaying entity that owes federal corporate income tax at a flat 21% rate on its net earnings. When those after-tax profits are distributed to members as dividends, the members pay tax again on the dividends at their individual rates. That double layer of taxation is the well-known drawback.
So why would anyone choose it? Two common reasons. First, C-corporation status lets the business retain earnings at the 21% corporate rate without passing income 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 number of shareholders, types of shareholders, or classes of stock, making 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.
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 main 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 there’s limited case law testing this. 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
Many states require licensed professionals to form a professional LLC (often abbreviated PLLC) instead of a standard LLC. The list of covered professions varies by state but commonly includes 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 described 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.
Member-Managed vs. Manager-Managed
Every LLC also has to decide who makes the calls, and this is a separate axis from taxation. 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 works naturally for 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 like 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 an internal preference. Banks, landlords, and other counterparties will check your articles of organization or operating agreement to determine who has authority to sign on behalf of the LLC. Getting this wrong can create headaches ranging from rejected loan applications to contracts a member signed without actual authority.
Choosing Among the Types
For most small businesses, the practical decision is between pass-through taxation (single-member, multi-member, or S-corp election) and corporate taxation (C-corp election). Pass-through owners pay income tax once, at their individual rates, and may qualify for the Section 199A deduction, which lets you deduct up to 20% of qualified business income from your taxable income. The full 20% deduction is available without restriction to taxpayers whose taxable income falls below an inflation-adjusted threshold (roughly $190,000 for single filers and $380,000 for joint filers, though the exact amounts change each year). Above those thresholds, limitations kick in based on how much the business pays in W-2 wages and the value of its depreciable property. Owners of specified service businesses like law, accounting, health care, and consulting face additional restrictions that can phase out the deduction entirely at higher income levels.9Office of the Law Revision Counsel. 26 U.S.C. 199A – Qualified Business Income
C-corporations don’t qualify for the 199A deduction, so the choice between pass-through and C-corp status often comes down to comparing that deduction against the flat 21% corporate rate and the potential Section 1202 gains exclusion. The specialized structures — series, professional, and L3C — layer on top of these tax choices rather than replacing them. A PLLC, for example, still elects its tax treatment the same way any other LLC does. Pick the tax election that fits how you’ll draw money out of the business, then pick the state-level variant only if your profession, asset structure, or mission requires it.