LLC, S Corporation, or C Corporation: Which One Fits Your Business?

Start with the two separate questions

State-law entity type and federal tax classification are not the same thing. An LLC is a legal entity formed under state law; for federal tax purposes it may be disregarded, taxed as a partnership, or, by election, taxed as an S corporation or a C corporation. "S corporation" is a tax status, not a state-law form. Understanding this separation removes most of the confusion in the conversation.

LLC taxed as a sole proprietorship or partnership

Profit flows through to the owners and is taxed on their individual returns whether or not it is distributed. Owners are not employees; earnings from an active trade or business are generally subject to self-employment tax. Administration is the lightest of the three, allocations among members can be flexible, and there is no second layer of tax. For a young business, a single owner, or a venture with uncertain profitability, this is often the sensible starting point.

S corporation

Also a pass-through, but owners who work in the business must be paid reasonable compensation through payroll, and remaining profit is distributed without being subject to self-employment tax. That distinction is the reason the election is popular. It comes with costs: payroll administration, a separate corporate return, stricter ownership rules, and only one class of stock. Eligibility is limited — generally to U.S. individuals and certain trusts and estates — which means nonresident owners cannot hold shares.

• Reasonable compensation must reflect the value of services actually performed
• Setting salary too low invites reclassification, interest, and penalties
• State treatment of S corporations varies and does not always match federal
• Losses are limited by basis rules that differ from partnership basis rules

C corporation

Taxed as a separate entity at the corporate level, with distributions to shareholders generally taxed again as dividends. That second layer is the standard objection, but the C corporation has real advantages: it can have unlimited shareholders, foreign shareholders, multiple classes of stock, and it can retain earnings to fund growth at the corporate rate. Certain qualified small business stock benefits are available only to C corporation shareholders. For businesses raising outside investment, or with non-U.S. owners, it is frequently the only workable option.

The factors that usually decide it

• Who owns it — a nonresident owner rules out an S election immediately
• Whether profits are distributed or reinvested
• How much of the profit is attributable to owner services versus capital
• Whether outside investors or multiple share classes are expected
• The likely exit: an asset sale and a stock sale can produce very different results by entity
• State tax exposure, including states that do not conform to federal pass-through treatment

Changing structure later

Elections and conversions are possible, but they are not all reversible and not all are tax-free. Converting from a C corporation to an S corporation carries specific consequences for built-in gains and accumulated earnings. Revoking an S election generally restricts re-electing for a period. Choosing with the next five years in mind is cheaper than restructuring in year three.

The honest summary

For most owner-operated service businesses of modest size, the practical comparison is between an LLC taxed as a partnership or sole proprietorship and an S corporation election, and the answer turns on profit level relative to reasonable compensation and the added administrative cost. For anything involving foreign ownership, outside capital, or retained earnings for growth, the C corporation deserves a serious look rather than a reflexive dismissal.

Sources and official references

• IRS — Business Structures
• IRS — S Corporations
• IRS — Limited Liability Company (LLC)