Entity type in business is the legal classification your company operates under, and it sets three things that shape everything else: how much personal liability you carry, how your income is taxed, and what paperwork you file with the state. The four main options are the sole proprietorship, the partnership, the limited liability company (LLC), and the corporation. Each one draws the legal line between you and your business in a different place, and picking the wrong one can expose your personal assets or cost you money every tax season.
What Entity Type Actually Means
Forming a business entity creates a legal “person” that can own property, sign contracts, and be sued in its own name. That separation is the point. When someone sues a corporation or LLC, the lawsuit targets the entity, not the individual owners, and a judgment against the business generally can’t reach the owners’ personal bank accounts or homes.
Not every entity type creates that separation. Sole proprietorships and general partnerships don’t produce a new legal person at all. The law treats the business and the owner as the same thing, so personal assets are fair game for business creditors. Choosing an entity type is really a decision about where the legal boundary sits between you and your business.
The Four Main Entity Types
Sole Proprietorship
A sole proprietorship is what you have by default when one person starts doing business without filing formation documents. There is no legal barrier between you and the business. Every asset belongs to you personally, and every debt or lawsuit against the business is a debt or lawsuit against you. A court judgment for an unpaid vendor bill can reach your savings, your car, or your house.
If you want to operate under a name other than your own, most jurisdictions require you to register a fictitious business name, sometimes called a DBA (“doing business as”). Without that registration, banks will generally refuse to open an account under the business name. The filing usually goes through a county clerk’s office and costs between $10 and $50. Some jurisdictions also require you to publish a notice in a local newspaper after filing.
Partnership
A general partnership forms automatically when two or more people go into business together, even without a written agreement. Like a sole proprietorship, it creates no liability shield. Every general partner is personally responsible for the full amount of partnership debts, not just a proportional share. If one partner signs a contract the business can’t pay, creditors can pursue any partner’s personal assets to collect the entire balance.
A limited partnership adds a second class of owner. General partners still run the business and carry unlimited personal liability, while limited partners function more like investors. Their exposure is capped at what they put in, and in exchange they stay out of day-to-day management. This structure is common in real estate ventures and investment funds.
Limited Liability Company
The LLC is a statutory creation authorized by every state. Its central feature is the liability shield between the business and its owners (called “members”). If the company gets sued or can’t pay its debts, members generally can’t lose more than what they’ve invested.
LLCs offer more operational flexibility than corporations. Members can manage the company directly or appoint managers. Internal rules are typically set out in an operating agreement that covers ownership percentages, profit distribution, voting rights, and what happens if a member wants to leave. Most states don’t require you to file the operating agreement with any government office, but having one matters. Without it, state default rules govern the company, and those defaults rarely match what the owners actually intended.
Licensed professionals such as physicians, attorneys, architects, and accountants are often required to form a professional LLC (sometimes abbreviated PLLC) instead of a standard LLC. State PLLC laws generally restrict membership to individuals holding the relevant professional license. The liability shield in a PLLC protects members from the company’s general business debts but typically does not shield a professional from liability for their own malpractice.
Corporation
A corporation is the most formally structured entity type. It has three layers: shareholders who own the company, a board of directors that sets strategy and provides oversight, and officers who handle daily operations. Corporations must observe ongoing formalities such as adopting bylaws, holding annual meetings, and keeping minutes. Skipping those formalities isn’t just sloppy; it can become the reason a court strips away the liability shield.
Corporations can issue stock, which makes them the standard vehicle for raising outside investment. Shares represent fractional ownership and can be transferred without disrupting the company’s existence. A corporation continues indefinitely regardless of changes in ownership.
How Each Type Is Taxed
Taxes are the second big axis of the entity decision, and they split along pass-through versus entity-level lines.
Sole proprietors report all business income on their personal return. They also owe self-employment tax on net earnings, which covers Social Security at 12.4 percent and Medicare at 2.9 percent, for a combined rate of 15.3 percent. Earnings above $200,000 (or $250,000 on a joint return) trigger an additional 0.9 percent Medicare surcharge on top of that base rate.
Partnerships pass income through to the individual partners. The partnership files an informational return but doesn’t pay income tax at the entity level. Each partner reports their share of profits and owes self-employment tax at the same 15.3 percent base rate.
LLCs don’t have their own IRS tax category. The IRS assigns a default classification based on the number of members. A single-member LLC is treated as a “disregarded entity,” meaning all income and expenses flow onto the owner’s personal return much like a sole proprietorship. A multi-member LLC is classified as a partnership by default.1Internal Revenue Service. LLC Filing as a Corporation or Partnership But you’re not locked into those defaults. An LLC can file Form 8832 to elect corporate treatment, or Form 2553 to elect S-corporation status. A profitable single-member LLC can sometimes save thousands in self-employment tax by electing S-corp treatment, since only the owner’s “reasonable salary” is subject to employment taxes rather than the full net income.2Internal Revenue Service. About Form 8832, Entity Classification Election
Corporations default to C-corporation status. A C-corp pays federal income tax at a flat 21 percent on taxable income.3Office of the Law Revision Counsel. 26 USC 11 – Tax Imposed When the corporation distributes profits as dividends, shareholders pay tax again on the dividend income. This double taxation is the main reason smaller businesses often look for alternatives.
An S-corporation avoids double taxation by passing income, losses, and credits through to shareholders’ personal returns. The corporation itself generally pays no federal income tax.4Office of the Law Revision Counsel. 26 USC Subtitle A, Chapter 1, Subchapter S – Tax Treatment of S Corporations and Their Shareholders S-corp status has strict eligibility rules. The company must be a domestic corporation with no more than 100 shareholders, all of whom must be individuals, certain trusts, or estates. Partnerships and other corporations can’t be shareholders. The company can issue only one class of stock.5Internal Revenue Service. S Corporations To elect, file Form 2553 no later than two months and 15 days after the beginning of the tax year you want the election to take effect. For a new corporation, the clock starts on the earliest of three dates: when the company first had shareholders, first had assets, or first began doing business. Miss that window and you wait until the next tax year.6Internal Revenue Service. Instructions for Form 2553
What You File to Form Each One
Sole proprietorships and general partnerships can begin operating without filing formation documents. Every other entity type requires formal registration with the state, typically through the Secretary of State’s office. For LLCs, you file articles of organization. For corporations, you file articles of incorporation. Both bring the entity into legal existence.
Formation documents generally require a unique business name not already registered in that state, the names and addresses of the organizers or incorporators, the entity’s principal office address, and a statement of purpose. You also designate a registered agent, a person or company authorized to accept legal documents on the entity’s behalf. The registered agent must maintain a physical street address in the state of formation; a P.O. box won’t work.
Filing fees vary by state and entity type. Some states charge under $50 for a basic corporation filing; others charge several hundred dollars. Most Secretary of State offices offer online filing with near-instant processing, while mail filings can take weeks. Once approved, the state issues a certificate confirming the entity’s existence.
Almost every formal entity also needs an Employer Identification Number from the IRS. Partnerships, LLCs, and corporations are all required to have one. Sole proprietors need an EIN if they hire employees or owe certain excise taxes.7Internal Revenue Service. Employer Identification Number The application is free through the IRS online portal and takes minutes. Third-party sites that charge for an EIN are selling you something the IRS provides at no cost. Entities with a principal place of business outside the United States can apply by phone, fax, or mail.8Internal Revenue Service. Get an Employer Identification Number
One boundary worth knowing: if your entity does business in a state other than where it was formed, you’ll likely need to register as a “foreign” entity there as well. “Foreign” in this context just means formed elsewhere, not international. Operating in another state without qualifying can result in fines and the loss of your ability to file lawsuits in that state’s courts.
Keeping the Liability Shield Intact
Having an LLC or corporation on paper doesn’t guarantee the liability shield holds up in court. Courts can “pierce the veil” and hold owners personally liable if they find the entity was being used as a personal piggy bank rather than a genuine separate business. The factors that most commonly lead to veil-piercing include mixing personal and business funds in the same accounts, failing to keep separate financial records, not holding required meetings or keeping corporate minutes, and starting the business with too little capital to cover foreseeable obligations.
Treat the entity as a real, separate thing. Open a dedicated bank account. Don’t pay personal expenses from business funds. If you run a corporation, actually hold your annual meetings and document what was decided. These habits cost almost nothing and are often the difference between the shield working and collapsing when it matters.
Staying in Good Standing
Forming the entity is not the finish line. Most states require periodic filings, usually called annual or biennial reports, to keep the entity in good standing. These reports update the state on basic information such as the current registered agent, principal address, and the names of officers or managers. Filing fees range from $0 in a handful of states to several hundred dollars, with most falling in the $50 to $200 range.
Missing a report deadline brings real consequences. States typically impose late fees first, then move to administrative dissolution if the entity stays noncompliant. Once administratively dissolved, the business loses its authority to operate. People who continue doing business on behalf of a dissolved entity risk personal liability for obligations incurred during that period. The entity may also lose its registered name if another business claims it.
Reinstatement is usually possible, but it often requires paying all back fees plus penalties and filing all overdue reports. Reinstatement generally “relates back” to the date of dissolution, creating a legal fiction that the entity was never dissolved, but courts have not always honored that fiction. In some cases, officers have been held personally liable for contracts signed or debts incurred while the entity was dissolved, even after reinstatement.
One federal filing that previously applied to most new entities no longer does for domestic companies. Under an interim final rule effective March 26, 2025, all domestic entities are exempt from the Corporate Transparency Act’s beneficial ownership reporting requirements. As of 2026, only entities formed under foreign law that have registered to do business in a U.S. state or tribal jurisdiction must file beneficial ownership reports with FinCEN, and those foreign reporting companies must submit their initial report within 30 days of registration.9Financial Crimes Enforcement Network. Frequently Asked Questions FinCEN has said it intends to issue a final rule, so this area may continue to change.10Federal Register. Beneficial Ownership Information Reporting Requirement Revision and Deadline Extension