A single-member LLC is a limited liability company owned by one person or one entity, formed under state law to give that sole owner the liability protection of a formal business while keeping the paperwork close to that of a sole proprietor. Every state allows it. The catch is that the shield only holds if you treat the company as a real, separate business, and the default tax treatment leaves you paying self-employment tax on every dollar of profit.
What a Single-Member LLC Actually Is
The LLC is a separate legal person from you. It can own property, sign contracts, and take on debt in its own name.1Internal Revenue Service. Limited Liability Company (LLC) The one owner is called a member, and that member can be an individual, a corporation, another LLC, or a trust.
That separation is the whole point. Liabilities that belong to the company stay with the company. If the business is sued or can’t pay a vendor, creditors generally can’t reach your personal bank account, home, or assets that sit outside the LLC. Delaware’s statute, for instance, spells out that an LLC is a separate legal entity that continues to exist until its certificate of formation is cancelled, and confirms that an operating agreement is enforceable even with only one party to it.2Delaware Code Online. Delaware Code 18 – Limited Liability Company Act3Delaware Code Online. Delaware Code 18-101 – Definitions
How to Form One
The mechanics are similar in every state. First, pick a name that’s distinguishable from other businesses already on file with your state’s Secretary of State. Most states have a searchable database. It’s also worth a quick check of the U.S. Patent and Trademark Office database so you don’t collide with a registered trademark.
Second, appoint a registered agent. That’s a person or company with a physical street address in your state (not a P.O. box) who accepts lawsuits and official mail for the LLC. You can be your own agent if you qualify, or hire a commercial service.
Third, file the formation document with the state. It goes by different names depending on where you are (Articles of Organization, Certificate of Formation, Certificate of Organization), but the content is the same: the LLC’s name, the registered agent, whether the LLC is member-managed or manager-managed, and sometimes a purpose statement. Filing fees run roughly $35 to $500. Most states let you file online. Once the state approves it, keep the stamped copy or confirmation certificate. Banks and licensing agencies will ask for it.
The Operating Agreement
The operating agreement is your LLC’s internal rulebook.4U.S. Small Business Administration. Basic Information About Operating Agreements It isn’t filed with the state; it stays in your records. With only one member, it can feel pointless, but skipping it is one of the most common mistakes single-member owners make.
A useful agreement documents your initial capital contribution, your authority to sign contracts and take on debt, how profits are distributed, and what happens to the business if you die or become incapacitated. Courts also treat it as evidence that the LLC is a genuine, separate entity rather than your personal alter ego. If a creditor argues the LLC is a shell, a written agreement you actually follow is one of your strongest defenses.
Keeping the Liability Shield Intact
The protection is real, but courts can pierce it if the LLC looks more like a fiction than a business. This happens more often with single-member LLCs than multi-member ones, because there’s no second owner keeping the first one honest. Courts look at the pattern, not any single slip:
- Commingling funds. Paying personal expenses from the LLC’s account, or depositing business income into your personal account, is the biggest red flag in veil-piercing cases.
- Undercapitalization. Starting the LLC without enough money or assets to realistically meet its foreseeable obligations.
- Personal use of business assets. Routinely driving the company vehicle for personal errands, using the business card as your own, or otherwise blurring what belongs to whom.
- Ignoring formalities. Letting the operating agreement lapse or never writing one, missing annual state filings, operating without required licenses, or losing your registered agent.
Any one of these on its own is rarely fatal. The combination is what destroys protection.
The Charging Order Gap
There’s a risk specific to single-member LLCs that owners often don’t hear about until it matters. When a personal creditor wins a judgment against an owner of a multi-member LLC, most states limit that creditor to a charging order, essentially a lien on any distributions the LLC pays out. The creditor can’t seize the business or force a liquidation, because doing so would harm the other innocent members.
With a single-member LLC, there are no other members to protect. Some states let creditors go beyond a charging order and force the LLC’s liquidation to satisfy a personal judgment against the sole owner. Delaware, Nevada, and Wyoming are among the states that have amended their laws to extend full charging order protection to single-member LLCs. Many have not. If asset protection is a primary reason you’re forming the LLC, check your state’s position before deciding where to organize.
How the IRS Taxes You by Default
The IRS treats a single-member LLC as a “disregarded entity” by default. The federal government ignores the LLC for income tax purposes and treats all of its income and expenses as belonging directly to you.5eCFR. 26 CFR 301.7701-3 – Classification of Certain Business Entities You report the business on Schedule C of your Form 1040, the same way a sole proprietor would.
You don’t automatically need an EIN. If your LLC has employees or owes excise taxes, you must get one. Otherwise, for federal income tax, you can use your own Social Security number. Most owners apply for an EIN anyway using Form SS-4, because banks routinely require one to open a business account.6Internal Revenue Service. Single Member Limited Liability Companies
If you’d rather have the LLC taxed as a corporation or S-corporation, you can file Form 8832 or Form 2553 to make that election.7Internal Revenue Service. About Form 8832, Entity Classification Election
Self-Employment Tax Is the Surprise
Here’s what catches new owners off guard. Because the LLC is disregarded, all of its net profit is subject to self-employment tax: 15.3% total, made up of 12.4% for Social Security and 2.9% for Medicare, on every dollar of net earnings above $400.8Office of the Law Revision Counsel. 26 USC 1402 – Definitions When you work for an employer, you split those taxes with the company. When you own the business, you pay both halves.
The Social Security piece stops at the annual wage base ($184,500 for 2026).9Social Security Administration. Contribution and Benefit Base The Medicare piece has no cap. Above $200,000 in self-employment income (for single filers), an extra 0.9% Medicare tax applies to the excess.10Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
You get a partial offset: half of your SE tax is deductible from your adjusted gross income, which reduces your income tax. The SE tax itself is still due in full, and for many owners past around $80,000 in profit, it becomes the largest single tax they pay. Quarterly estimated payments are how you avoid a nasty April surprise.
The S-Corp Election as a Fix
The most common way single-member LLC owners cut their SE tax bill is to elect S-corporation treatment. Instead of paying SE tax on all net profit, an S-corp owner splits the take into two buckets: a salary, which is subject to payroll tax, and distributions, which are not. If the LLC earns $150,000 and you pay yourself a $70,000 salary, the remaining $80,000 in distributions avoids the 15.3% hit.
You make the election on Form 2553, filed no later than two months and 15 days after the start of the tax year you want it to take effect, or any time during the preceding tax year.11Internal Revenue Service. Instructions for Form 2553 Miss the window and you generally wait until next year, though the IRS grants late-election relief in some cases.
The catch is the reasonable compensation rule. The IRS requires your salary to reflect what someone with your training, experience, and responsibilities would earn in the open market.12Internal Revenue Service. Wage Compensation for S Corporation Officers You can’t pay yourself $15,000 while taking $135,000 in distributions. If the IRS audits and finds your salary was too low, it can reclassify distributions as wages and assess back payroll taxes plus penalties.
The election also brings costs: running payroll, filing quarterly payroll tax returns, and preparing an 1120-S corporate return in addition to your 1040. For owners with net profit consistently above roughly $50,000 to $60,000, the payroll tax savings usually cover those costs. Below that, they generally don’t.
When You Hire an Employee
The LLC is disregarded for income tax, but the IRS treats it as a separate entity for employment tax. The moment you hire someone, the LLC itself (not you personally) is responsible for withholding, reporting, and paying federal employment taxes, and it files under its own name and EIN.6Internal Revenue Service. Single Member Limited Liability Companies W-2s, quarterly Form 941 returns, and federal unemployment tax filings all go under the LLC. If it doesn’t already have an EIN, get one on Form SS-4.13Internal Revenue Service. About Form SS-4, Application for Employer Identification Number
Ongoing State Compliance
Forming the LLC is the start. Most states require an annual or biennial report to keep the entity in active standing, updating your business address, registered agent, and member information. Fees range widely, from nothing in some states to several hundred dollars in others, with a few states charging $800 or more through franchise taxes or similar assessments.
Missing filings doesn’t just mean a late fee. After enough missed reports, the state will administratively dissolve the LLC. A dissolved LLC may not be able to enforce contracts or sue, and the liability protection you formed it for can evaporate. Reinstatement is usually possible but involves back fees and penalties.
Depending on where you operate and what you do, you may also need a local business license, a professional license, or industry-specific permits. A freelance web designer often needs nothing beyond the LLC. A contractor, tax preparer, or healthcare professional will almost certainly need more.
Federal Beneficial Ownership Reporting
The Corporate Transparency Act originally required most LLCs to report their beneficial owners to the Financial Crimes Enforcement Network. In March 2025, FinCEN issued an interim final rule removing beneficial ownership reporting requirements for all entities created in the United States.14Financial Crimes Enforcement Network. FinCEN Removes Beneficial Ownership Reporting Requirements for U.S. Companies and U.S. Persons Under that rule, domestic single-member LLCs are exempt from filing beneficial ownership information reports, and FinCEN is not enforcing BOI-related penalties against domestic companies or their owners. FinCEN has said it intends to finalize the rule, but this area has shifted more than once, so it’s worth checking for further changes before you assume the exemption still holds.