Choosing a legal structure is among the first decisions a new business makes and one of the few that is genuinely difficult to unwind later. The choice determines personal liability exposure, how profits are taxed, what administrative burden the business carries, and whether outside investment is practical.
This article describes the structures commonly used in the United States. Terminology and treatment differ substantially in other jurisdictions, and specific tax rates, thresholds and eligibility rules change. Treat what follows as a map of the trade-offs, not as current tax guidance.
The two questions that drive the decision
Structures differ along two axes that are worth separating in your mind, because they are frequently conflated.
Liability. Is the business a separate legal person, such that its debts and legal obligations stop at the business rather than reaching the owner’s home and savings?
Taxation. Is profit taxed once, on the owner’s personal return, or twice — once at the entity and again on distribution?
These are largely independent. An LLC can be taxed several different ways without changing its liability protection at all, which is the source of most confusion in this area.
Sole proprietorship
The default when an individual begins trading without forming anything. No filing is required to create it, though local licences and registrations may still apply.
Liability: none. There is no legal separation between owner and business. Business debts are personal debts, and a judgment against the business reaches personal assets.
Tax: profit is reported on the owner’s personal return and subject to income tax plus self-employment tax covering Social Security and Medicare.
Reasonable for: very low-risk activity, testing an idea, minimal revenue. The absence of liability protection makes it unsuitable for anything involving physical premises, employees, meaningful contracts or professional advice.
General partnership
The multi-owner default, formed automatically when two or more people carry on business together for profit — sometimes without either realising it.
Liability: unlimited, and importantly joint and several. Each partner can be held responsible for the full extent of partnership obligations, including those incurred by another partner acting alone.
Tax: the partnership files an information return; profit passes through to partners in agreed proportions and is taxed on their personal returns.
The joint and several exposure makes general partnerships a poor default. Where partners want pass-through treatment, a multi-member LLC generally achieves it with liability protection attached.
Limited liability company
The LLC is a state-law entity providing corporate-style liability protection with substantial flexibility in tax treatment. It is the most common choice for small businesses, and generally for good reason.
Liability: members are generally not personally liable for the LLC’s debts, provided the separation is genuinely maintained.
Tax: by default a single-member LLC is disregarded and taxed like a sole proprietorship; a multi-member LLC is taxed as a partnership. In both cases the LLC may instead elect to be taxed as an S corporation or a C corporation. The liability protection is unaffected by the election.
Administration: formation and annual state filings, an operating agreement, and separate finances. Lighter than a corporation in most states.
The protection is not absolute. Courts can disregard the entity — “piercing the veil” — where owners commingle personal and business funds, fail to maintain records, or leave the business obviously undercapitalised. Lenders also routinely require personal guarantees from small business owners, which contractually reinstates personal liability for that specific debt.
S corporation election
S corporation is a tax election available to eligible LLCs and corporations, not a separate entity type.
Its principal attraction concerns employment taxes. An owner-operator must be paid reasonable compensation as a salary, subject to employment taxes. Remaining profit may be distributed without incurring self-employment tax. Where profit substantially exceeds reasonable compensation for the work performed, this can produce meaningful savings.
The qualifications matter as much as the benefit:
- “Reasonable compensation” is a genuine legal requirement and an established audit focus. Paying an artificially low salary to convert wages into distributions is a recognised and challenged position.
- Payroll must be operated properly, adding real administrative cost.
- Eligibility is restricted — limits on the number and type of shareholders, and a single class of stock.
- The single-class-of-stock rule makes S corporations largely incompatible with venture financing.
The election becomes worth examining once profit is comfortably above what the owner would be paid to do the same job for someone else. Below that, administrative cost tends to consume the saving.
C corporation
The default corporate form, and a separate taxpaying entity.
Tax: the corporation pays tax on its profit. Dividends are then taxed again on shareholders’ returns — the double taxation that makes C corporations unattractive for businesses distributing most of their earnings.
Despite that, it is the standard structure for companies seeking institutional investment, for several reasons: it accommodates multiple share classes with different rights, which preferred equity requires; venture funds often cannot hold pass-through interests without adverse consequences for their own investors; equity compensation mechanics are well established; and qualified small business stock treatment, available only for certain C corporation shares, can offer significant benefits to founders and early investors who meet the conditions.
Double taxation also bites less for a company reinvesting rather than distributing profit — which describes most venture-backed businesses.
How to choose
- Any real liability exposure — employees, premises, contracts, professional advice? Form an entity. This consideration outranks tax optimisation.
- Intending to raise venture capital? A C corporation is the expected structure, and converting later is possible but costly and disruptive.
- Profitable owner-operated business with profit well above a market salary? Model the S corporation election with an accountant, including payroll cost.
- Small, low-risk, early? An LLC taxed by default is usually sufficient, and can elect S corporation treatment later as profit grows.
- Multiple owners? Whatever the structure, the operating or shareholder agreement matters more than the entity type — how decisions are made, how someone exits, what happens on disagreement.
What this article cannot do
State law varies considerably, including on formation costs, franchise taxes and annual fees that can materially change the comparison. Federal tax rules change. Professional licensing rules restrict which structures some occupations may use. And the right answer depends on facts specific to a business — revenue, profit, ownership, risk profile and plans.
An accountant and a lawyer, consulted once at formation, cost far less than restructuring later or discovering that liability protection was never actually in place.
Related reading
For managing the cash consequences whichever structure you choose, see cash flow management fundamentals.
This article is general information and journalism, not legal, tax or accounting advice, and it does not create a professional relationship. Rules change and vary by jurisdiction. Consult qualified professionals before choosing or changing a business structure. See our Editorial Policy.