A one-person company is a business formally registered with a state and owned by a single individual, most often as a single-member limited liability company (LLC) or a corporation with one shareholder. Either form puts a legal wall between the owner’s personal assets and the business’s debts, which a plain sole proprietorship cannot do. Filing fees run roughly $35 to $500 depending on the state, and the choice between LLC and corporation matters less for liability than it does for taxes and paperwork.
Why the Structure Exists
Anyone who starts earning money from a business without filing formation paperwork is a sole proprietor by default. There is no legal line between the owner and the business. Every profit, every contract, and every lawsuit lands on the owner personally, and if the business cannot pay a debt, creditors can pursue the owner’s home, savings, and other personal property.
Filing formation documents with the state changes that. The new entity can own property, sign contracts, and be sued in its own name. Its debts belong to it, not to the owner, provided the owner keeps personal and business finances genuinely separate. That protection is the main reason solo founders go through the trouble of incorporating.
There is a second reason. A sole proprietorship dies with its owner and folds into the estate. A one-person company set up correctly can survive the founder’s death and pass to a named successor.
LLC or Corporation for a Solo Owner
Most solo founders choose a single-member LLC. It has no restrictions on who can own it, no mandatory board of directors, no stock to issue, and by default no entity-level tax. The owner runs the business directly unless they appoint a manager. Profits and losses flow through to the owner’s personal return.
A single-shareholder corporation gives the same liability shield but adds structural work: a board of directors, officer appointments, and formal corporate resolutions kept on file. An S corporation election limits ownership to 100 shareholders who must all be U.S. citizens or residents, and the company can issue only one class of stock. A C corporation carries none of those ownership limits but faces double taxation, once at the corporate level and again when profits reach the shareholder as dividends.
The practical point for a solo owner: an LLC can elect to be taxed as a corporation later without actually becoming one, so starting as an LLC keeps every option open with the least overhead.
How to Form One
Pick and Check the Name
State law requires the business name to be distinguishable from other active entities on file with the secretary of state, and most states offer a free online name search. Filing the name with the state does not give you trademark rights or confirm that no one else is using it in commerce, so it’s worth searching the U.S. Patent and Trademark Office database separately.
Appoint a Registered Agent
All 50 states require an LLC or corporation to name a registered agent authorized to accept legal papers and state correspondence on the entity’s behalf. The agent must have a physical street address in the state of formation and be available during normal business hours. A P.O. box does not qualify. You can serve as your own agent in most states, but a paid service (roughly $49 to $300 per year) keeps your home address off public records and reduces the risk of missing something important.
File the Formation Documents
For an LLC, you file articles of organization, called a certificate of formation in some states, with the secretary of state. The form is short: company name, registered agent, principal office address, and organizer. Fees vary widely by state. Online filings can be processed the same day; paper filings can take weeks.
Draft an Operating Agreement
The operating agreement is the internal document that governs how the LLC runs. California, Delaware, Maine, Missouri, and New York require one by statute. Everywhere else, skipping it is still a mistake. Banks often ask for one before opening a business account, and courts deciding whether to respect the LLC’s liability protection look at whether the owner treated the business as a real entity. The agreement should cover the owner’s management authority, how profits and losses are handled, what happens if the owner dies or is incapacitated, and how the business would be dissolved.
Get an EIN
The Employer Identification Number is a federal tax ID from the IRS, free of charge. You need one if the business has employees, owes excise taxes, or withholds taxes on payments to non-resident aliens, and most banks require it to open a business account. The IRS online application issues the number immediately; a paper Form SS-4 takes about four weeks.
How a One-Person Company Is Taxed
The Default: Disregarded Entity
By default the IRS treats a single-member LLC as a disregarded entity. The business files no separate income tax return. The owner reports business income and expenses on Schedule C of their personal Form 1040, the same as a sole proprietor. That profit is subject to both income tax and self-employment tax.
Self-employment tax covers Social Security and Medicare at a combined 15.3%. The Social Security portion (12.4%) applies to net earnings up to $184,500 in 2026. The Medicare portion (2.9%) has no cap. Owners earning above $200,000, or $250,000 if married filing jointly, also pay an extra 0.9% Medicare surtax on earnings above those thresholds.
Pass-through owners may qualify for the qualified business income deduction under Section 199A, made permanent by the One Big Beautiful Bill Act, which allows a deduction of up to 20% of qualified business income. Income limits and the type of business can reduce or eliminate the deduction at higher earnings.
Electing Corporate or S Corp Treatment
A single-member LLC can elect to be taxed as a corporation by filing Form 8832. More often, solo owners go a step further and elect S corporation status with Form 2553; a timely Form 2553 is automatically treated as a corporate classification election, so the LLC does not need to file Form 8832 separately.
Under S corp treatment the owner pays themselves a reasonable salary through payroll (subject to payroll taxes) and can take remaining profits as distributions, which are not subject to self-employment tax. For a profitable business the payroll tax savings can be significant. For a business earning less, the cost of running payroll and filing a separate corporate return can wipe out the benefit.
Keeping the Liability Shield Intact
Filing formation papers does not guarantee the liability wall holds. If an owner treats the business as an extension of themselves, a court can “pierce the corporate veil” and hold the owner personally responsible for business debts. Single-member entities are the most exposed to veil-piercing because there are no co-owners forcing good habits.
Courts look at a few things. Commingling funds is the most common trigger: running personal and business transactions through one account. Undercapitalization matters too, meaning starting the business with so little money it could never realistically pay its debts. Ignoring formalities, such as failing to keep records, missing state filings, or having no operating agreement, weakens the case that the entity is genuinely separate. And using business property to pay personal bills blurs the line courts need to see.
The discipline is simple. Open a dedicated business bank account tied to the company’s EIN. Keep records. File required state reports on time. Never pay personal expenses from the business account. These habits cost almost nothing and are the difference between protection that holds and protection that collapses.
Staying Compliant Year to Year
Most states require an LLC or corporation to file an annual or biennial report with the secretary of state, updating the address, registered agent, and names of owners or managers. Fees vary by state. Missing the deadline brings late fees, and prolonged noncompliance can lead the state to administratively dissolve the entity, which strips the liability protection the owner formed the company to get.
On the federal side, a single-member LLC on default tax treatment files Schedule C each year and pays quarterly estimated taxes if it expects to owe $1,000 or more. An owner who elected S corp treatment files Form 1120-S, runs payroll for their own salary, deposits payroll taxes quarterly, and files an annual W-2.
Keep the registered agent current. If the agent resigns or moves, file the update with the state right away. A lapsed agent can mean missed service of process and a default judgment against the company.
Planning for What Happens to the Business Later
What happens to a one-person company when the owner dies depends almost entirely on the operating agreement. Without one, state default rules generally dissolve the LLC, and the membership interest passes through probate with the rest of the estate. Probate can take months, and during that time the business may sit idle with no one authorized to run it.
An operating agreement can head this off with a transfer-on-death provision that names a beneficiary to receive the membership interest immediately, similar to a payable-on-death designation on a bank account. Some states also allow a membership interest certificate marked “transfer on death” to achieve the same result even without an operating agreement.
Owners who want more control can hold the LLC interest in a revocable living trust, which avoids probate and lets the trust document set out how the business should be managed or wound down. The worst choice is doing nothing. A one-person LLC with no succession plan and no operating agreement will almost certainly end up in probate, and the delay alone can destroy a business that depends on the owner being active in it.
Creditor Protection Varies by State
Multi-member LLCs enjoy “charging order” protection, which stops a member’s personal creditors from seizing company assets and limits them to whatever distributions the LLC chooses to make. For single-member LLCs this protection is inconsistent. Because there are no other members to shield, some courts let creditors go past a charging order and force liquidation of the LLC’s assets to satisfy the owner’s personal debts.
Alaska, Delaware, Nevada, South Dakota, and Wyoming have specifically extended full charging order protection to single-member LLCs. Florida has moved the other way, giving single-member entities weaker protection than multi-member ones. If personal liability exposure is a major concern, the state of formation matters, and a short conversation with a business attorney in your state usually pays for itself.