A business entity is a legally recognized structure for conducting commercial activity, and in most forms it exists as a separate legal person distinct from the people who own it. That separation is the point. It lets the business own property, sign contracts, sue and be sued, and borrow money in its own name instead of yours. The type you choose decides three things that will shape the rest of your business life: how much personal liability protection you get, how the IRS taxes your profits, and how much paperwork you keep up with year after year.
What Legal Separation Actually Does for You
When you form an LLC or a corporation, the law treats that entity as its own legal person. It can open bank accounts, hold title to real estate, own intellectual property, and sign binding contracts. If someone sues the business, they sue the entity. If the business takes on debt it cannot repay, creditors go after the entity’s assets first. Your personal savings, your home, and your other property sit behind a legal barrier that creditors generally cannot cross.
This protection is not automatic for every structure. A sole proprietorship creates no separation at all. Your business assets and personal assets are legally the same thing, and you can be held personally liable for every obligation the business takes on.1U.S. Small Business Administration. Choose a Business Structure That unlimited exposure is the main reason most owners eventually form a separate entity.
The Main Types of Business Entities
Sole Proprietorship
If you start doing business without filing any formation documents, you are a sole proprietorship by default. There is no legal separation between you and the business. Setup is effortless. The tradeoff is total personal liability for every business debt, lawsuit, or obligation.1U.S. Small Business Administration. Choose a Business Structure All profits flow onto your personal tax return, and you pay self-employment tax on the full amount. Sole proprietorships work for very low-risk activities, but most businesses outgrow this structure quickly.
Partnerships
When two or more people go into business together without forming a separate entity, they have a general partnership. Each partner shares management authority and unlimited personal liability for the partnership’s debts. A limited partnership is more structured: it has at least one general partner who runs the business and bears full liability, while limited partners contribute capital and risk only what they invested. Limited liability partnerships go further and give every partner some protection from the actions of the other partners.1U.S. Small Business Administration. Choose a Business Structure
All partnership types are pass-through entities for federal tax purposes. Profits and losses flow to each partner’s personal return. The general partner also owes self-employment tax. A written partnership agreement is essential even where state law does not require one. Without one, state default rules govern profit splits, decision-making authority, and what happens if a partner wants to leave, and those defaults rarely match what the partners actually intended.
Limited Liability Company
An LLC combines the liability protection of a corporation with the tax flexibility of a partnership. Your personal assets are generally shielded from business debts and lawsuits.1U.S. Small Business Administration. Choose a Business Structure By default, the IRS treats a single-member LLC as a disregarded entity, meaning all income and expenses go on your personal return. A multi-member LLC is taxed as a partnership by default. Either type can elect to be taxed as a corporation by filing Form 8832 with the IRS.2Internal Revenue Service. LLC Filing as a Corporation or Partnership
An operating agreement governs how the LLC is managed, how profits are split, and what happens when a member leaves or the company dissolves. A handful of states require one by law, but every LLC should have one regardless. Without it, state default rules fill the gaps. The operating agreement also reinforces the legal separation between owners and the entity, which matters if the shield is ever challenged in court.
C Corporation
A C corporation is a separate legal entity owned by shareholders, managed by a board of directors, and run day-to-day by officers. It offers the strongest personal liability protection of any structure.1U.S. Small Business Administration. Choose a Business Structure The tradeoff is double taxation. The corporation pays a flat 21 percent federal income tax on its profits, and shareholders pay tax again on any dividends they receive.3Office of the Law Revision Counsel. 26 USC 11 Tax Imposed C corporations can issue multiple classes of stock and have unlimited shareholders, which makes them the natural choice for businesses that plan to raise outside investment or go public.
The governance requirements are more demanding than other structures. Corporations hold annual shareholder meetings, maintain a board of directors, record meeting minutes, and file annual reports with the state. These formalities are not optional busywork. They are part of what keeps the liability shield intact.
S Corporation
An S corporation is not a different type of entity. It is a tax election that an eligible corporation or LLC makes with the IRS. Profits pass through to shareholders’ personal returns instead of being taxed at the corporate level, which eliminates double taxation. The catch is strict eligibility. The company can have no more than 100 shareholders, only one class of stock, and every shareholder must be a U.S. citizen or resident individual, with limited exceptions for certain trusts and estates. No other corporation or partnership can be a shareholder.4Office of the Law Revision Counsel. 26 U.S. Code 1361 – S Corporation Defined
The S-corp election is popular among small business owners in part because of how it handles self-employment tax. In a standard LLC, the full share of business income is subject to self-employment tax. In an S corporation, the IRS requires owner-employees to pay themselves a reasonable salary, which is subject to payroll taxes, but any remaining profit distributed as dividends is not. The “reasonable salary” requirement prevents owners from paying themselves a token amount to game the system. To make the election, you file IRS Form 2553 no later than two months and 15 days after the beginning of the tax year in which you want the election to take effect.
Nonprofit Corporation
A nonprofit corporation is formed at the state level like any other corporation, but it pursues a charitable, educational, religious, or scientific purpose instead of distributing profits to owners. To qualify for federal tax exemption under Section 501(c)(3), the organization must be organized and operated exclusively for exempt purposes. No part of its earnings can benefit any private shareholder or individual. The organization is also restricted from participating in political campaigns and may not devote a substantial portion of its activities to lobbying.5Internal Revenue Service. Exemption Requirements – 501(c)(3) Organizations
In return, a 501(c)(3) is exempt from federal income tax, and donations to it are tax-deductible for the donor. Formation involves incorporating at the state level first, then applying to the IRS for tax-exempt status using Form 1023 or the streamlined Form 1023-EZ.
How Each Entity Is Taxed
Your entity choice puts you on one of two basic tax paths. Pass-through entities, which include sole proprietorships, partnerships, LLCs taxed as partnerships, and S corporations, do not pay federal income tax at the entity level. Profits flow to the owners’ personal returns and are taxed at individual rates. C corporations sit on the other path. The entity itself pays a flat 21 percent tax on profits, and shareholders pay personal income tax again on dividends.3Office of the Law Revision Counsel. 26 USC 11 Tax Imposed
Self-employment tax is the other big consideration. Sole proprietors and general partners owe self-employment tax on their entire share of business income. LLC members in a default-taxed LLC face the same obligation. S corporation shareholders, by contrast, owe payroll taxes only on their salary, not on distributions above that salary.1U.S. Small Business Administration. Choose a Business Structure This is one of the most common reasons small businesses elect S-corp status, but it only makes sense when the tax savings exceed the added cost of running payroll and filing the extra returns an S corporation requires.
LLCs have the most flexibility. A single-member LLC defaults to disregarded entity status, taxed like a sole proprietorship, while a multi-member LLC defaults to partnership taxation. Either can file Form 8832 to elect corporate treatment, or Form 2553 to elect S-corp treatment.2Internal Revenue Service. LLC Filing as a Corporation or Partnership Being able to change your tax treatment without changing the underlying entity is one reason the LLC has become the default choice for most new small businesses.
When the Liability Shield Fails
The liability shield only holds up if you treat the entity as separate from yourself. Courts will “pierce the corporate veil” and hold owners personally responsible when the entity is really just an alter ego for the person behind it. The most common way this happens is commingling funds: paying personal expenses from the business account, depositing business income into a personal account, or running both through one checking account. Once a judge sees that you ignored the line between your money and the company’s money, the legal boundary starts to dissolve.
Other factors that put the shield at risk include failing to hold required meetings or keep minutes, undercapitalizing the entity so it never had enough money to operate independently, and using the entity to commit fraud.6NYCourts.gov. Walkovszky v Carlton Keeping your shield intact is not complicated, but it requires discipline. Maintain a separate business bank account and never use it for personal purchases. Hold and document any meetings your governing documents require. Keep the business adequately funded so it can pay its own obligations. These habits cost almost nothing and are the difference between a shield that holds and one that collapses in court.
How to Form and Maintain an Entity
Formation happens at the state level. You file a document called the Articles of Organization for an LLC or the Articles of Incorporation for a corporation. Most states provide standardized forms through the secretary of state’s website. The information required is minimal: the entity’s name, its registered agent, its principal address, and the organizer’s signature.7U.S. Small Business Administration. Register Your Business Every LLC and corporation must designate a registered agent with a physical street address in the state of formation to accept legal documents on the entity’s behalf. Filing fees for LLCs range from roughly $35 to $500 depending on the state, with an average around $130. Online filings in some states are processed within hours. Paper filings can take weeks.
Once the state approves your filing and issues a certificate, you apply for a federal Employer Identification Number from the IRS. This nine-digit number functions like a Social Security number for the business and is required to open a business bank account, hire employees, and file tax returns. Applying is free through the IRS website, and the number is issued immediately upon approval.8Internal Revenue Service. Get an Employer Identification Number Form the entity first, then apply for the EIN; the other order causes delays.
State registration creates the entity, but it does not authorize you to operate in every industry. Many cities and counties require a general business license, and some professions require state-level occupational licenses on top of that. What applies depends on what you do and where you do it.
Your formation documents filed with the state are minimal and public. The real rules of how your business operates live in internal documents: bylaws for a corporation, or an operating agreement for an LLC. Draft these before you start operating. Relying on state default rules is a common shortcut that creates expensive disputes later.
Maintenance is ongoing. Most states require an annual or biennial report confirming the entity’s name, address, registered agent, and current officers or managers. Fees for these reports range from $0 in some states to several hundred dollars in others. A few states also charge a franchise tax for the privilege of existing as a business entity there, owed regardless of whether the business made money. Missing these obligations puts the entity at risk of administrative dissolution. Once dissolved, the entity can no longer conduct business, may lose its name to another company, and anyone who keeps operating under the dissolved entity’s name risks personal liability for debts incurred during that period.
One boundary worth knowing: forming an entity in one state does not automatically let you do business in another. If your company has a physical presence in a second state, such as an office, warehouse, or retail location, you generally need to register there as a “foreign” entity, meaning formed somewhere else. Isolated transactions, maintaining a bank account, and running a website accessible from another state generally do not trigger this requirement, but ongoing commercial presence does. Operating without foreign qualification where it is required can result in fines and loss of access to that state’s courts to enforce your contracts.