LLC vs. S-Corp vs. C-Corp: How to Choose Your Business Entity

Two decisions hide inside the phrase “choosing an entity.” The first is legal: which type of entity you form under state law — a limited liability company, a corporation, or a partnership. The second is tax: how the IRS treats that entity — as a disregarded entity, a partnership, an S-Corporation, or a C-Corporation. An LLC, for example, is a legal entity that can be taxed four different ways. Getting this right at the start saves years of restructuring; getting it wrong is fixable but rarely free.

Start with liability, then solve for tax

For almost every operating business, the legal question answers itself: form an entity that separates your personal assets from business liability. For most owner-operated businesses that means an LLC — simple to maintain, flexible in ownership, and respected in every state. Corporations also provide the liability shield, but carry more formality (board minutes, bylaws, stock records) than most small operators need on the legal side alone.

Once the legal wrapper is chosen, the more consequential decision is the tax election — and that is where the real money is.

The default: sole proprietorship or partnership taxation

A single-member LLC is, by default, a disregarded entity: its income lands on the owner’s Schedule C, and every dollar of net profit is exposed to self-employment tax on top of income tax. A multi-member LLC defaults to partnership taxation, with each member picking up their share on a K-1 and paying self-employment tax on their distributive share of the earnings from a trade or business.

Default taxation is the right answer for a lot of businesses — new ones, thin-margin ones, and side ventures where the administrative cost of anything else outweighs the benefit. The mistake is staying on the default long after the numbers say to change.

The S-Corp election: the highest-leverage move for profitable operators

An LLC or corporation can elect to be taxed as an S-Corporation. The appeal is specific: an S-Corp owner-employee pays employment taxes on their wages, but the residual pass-through earnings — the distributions — are not subject to self-employment tax. For a profitable business where a meaningful share of the profit exceeds the value of the owner’s labor, that difference is real, recurring money.

It is not free money, and it is not automatic. An S-Corp election brings a separate tax return, payroll, and — most importantly — the reasonable-compensation requirement: you must pay yourself a defensible W-2 salary before treating anything as a distribution. Elect too early, and payroll and filing overhead swamp the benefit. Elect without a reasonable-compensation plan, and you invite exactly the scrutiny that unwinds the savings. We wrote a full breakdown of that trade-off in S-Corp Tax Optimization.

The rule of thumb worth internalizing: the S-Corp election starts to make sense once net profit is high enough that the self-employment tax saved on distributions clearly exceeds the cost of running payroll, filing a separate return, and paying a reasonable salary. The exact threshold depends on your profit, how much of it is genuinely owner labor, and your state — which is why it’s worth modeling with your real numbers rather than applying a percentage you read online.

When a C-Corp actually makes sense

C-Corporation taxation carries the well-known cost of two layers of tax — the corporation pays tax on its earnings, and shareholders pay again on dividends. For most owner-operated businesses that’s a reason to avoid it. But there are fact patterns where a C-Corp is the right answer: raising institutional capital, issuing multiple classes of stock, retaining significant earnings inside the business at the corporate rate, or positioning for Qualified Small Business Stock treatment. If none of those describe you, a C-Corp is usually solving a problem you don’t have.

A working decision framework

• Just starting, or thin margins? Single-member LLC (disregarded) or multi-member LLC (partnership). Keep it simple until profit justifies more.
• Consistently profitable, with profit exceeding the value of your labor? Model the S-Corp election. This is where most owner-operators leave money on the table.
• Multiple owners with different economics? Partnership taxation is flexible on allocations; an operating or partnership agreement matters more than the tax form here.
• Raising outside capital or planning for QSBS? C-Corp — but confirm the fact pattern before you commit to two layers of tax.

Why the two decisions belong with one advisor

The reason entity selection goes wrong so often is that the two halves get split: an online service or a paralegal handles the legal filing, and a preparer handles the tax return a year later — by which point the election window may have closed or the operating agreement doesn’t match the tax posture. When the legal form and the tax election are decided together, the operating agreement reflects the allocations, the S-Corp election is filed on time (or late-election relief is pursued deliberately), and the payroll and reasonable-compensation setup exists before the first distribution.

That is the entire premise of how we handle business formation and entity selection: one advisor accountable for both the legal structure and the tax result, so the two fit each other from day one.