LLC vs S-corp vs C-corp
The single most useful thing to understand before comparing an LLC, an S-corp, and a C-corp is that they are not three versions of the same thing. An LLC is a legal entity formed at the state level. S-corp and C-corp are tax classifications at the federal level. The confusion comes from the fact that an LLC can be taxed as a default pass-through, as an S-corp, or as a C-corp — so an owner is often really choosing a tax treatment for an entity they already have, not picking among three separate structures. This article compares the three on the things that actually differ: taxation, ownership and fundraising, administration, and the situations where each one wins.
It is informational, not tax or legal advice. The figures and rules are for 2026 and vary by state and situation; a CPA should confirm anything material to a specific return. For the LLC-versus-S-corp question in isolation, see LLC vs S-corp, and for how the default LLC is taxed, see how is an LLC taxed.
Taxation: the core difference
A default LLC is a pass-through entity. Profits flow to the owners' personal returns and are taxed once, and the owner pays self-employment tax on the business's net earnings — the part that surprises new owners, because it covers Social Security and Medicare on the full profit. An S-corp is also pass-through, but it splits an owner's pay into a reasonable salary (subject to payroll taxes) and distributions (not subject to self-employment tax). That split is the entire tax appeal of the S-corp: above a certain profit level, shifting some income from salary to distribution can reduce the payroll-tax bill. A C-corp is different in kind. It pays a flat corporate income tax on its profits, and then shareholders pay tax again on dividends — the familiar double taxation. In exchange, a C-corp can offer deductible fringe benefits, retain earnings at the corporate rate, and issue stock that may qualify for qualified small business stock (QSBS) treatment, which matters to investors.
The self-employment-tax point deserves a closer look, because it is where most of the real money in this decision sits for small owners. In a default LLC, the owner's entire net profit is generally exposed to self-employment tax, which funds Social Security and Medicare. That is a meaningful percentage off the top, and it applies whether or not the owner takes the money out of the business. The S-corp election attacks exactly this. By paying the owner a reasonable salary — on which payroll taxes are due — and treating the rest of the profit as a distribution that escapes self-employment tax, the owner can shrink the payroll-tax base. The catch is the word reasonable: the salary must reflect what the role would actually pay, and a salary set artificially low to dodge payroll tax invites scrutiny. Done correctly, the split is legitimate and well established; done aggressively, it is a classic audit target.
Ownership and fundraising
The three diverge sharply on who can own them and how they raise money. An LLC is the most flexible: any number of members, individuals or entities, domestic or foreign, with freely customizable ownership and profit-sharing through the operating agreement. An S-corp is the most restricted: it is capped at 100 shareholders, generally limited to U.S. individuals and certain trusts, cannot have other corporations or most foreign owners as shareholders, and allows only one class of stock. A C-corp is the most expansive for fundraising: unlimited shareholders, multiple stock classes, foreign and institutional investors, and the share structure venture capital expects. This is why nearly every company built to raise institutional money is a C-corp — the ownership rules of an LLC or S-corp simply do not fit a priced equity round.
The one-class-of-stock rule is the quiet dealbreaker that surprises founders. Venture investors expect preferred stock with rights that ordinary common shares do not carry — liquidation preferences, anti-dilution terms, and the like. An S-corp cannot issue that second class, so an S-corp is structurally incapable of accepting a standard venture round without first converting. An LLC can in theory replicate complex economics through its operating agreement, but investors generally dislike taking equity in an LLC because of the pass-through tax reporting it pushes onto them. The C-corp's clean, familiar share structure is precisely what the funding ecosystem is built around. So while ownership flexibility sounds like an LLC strength, it becomes a liability the moment outside priced equity enters the picture, and that reversal is exactly why the entity decision should track the funding plan.
Administrative burden
Complexity rises across the three. A default LLC has the lightest ongoing burden: an operating agreement, a separate bank account, and a single pass-through filing. Electing S-corp status adds real overhead — running payroll for the owner, filing a separate corporate return, and defending the reasonableness of the salary — which is why the S-corp election only pays off once profits are high enough for the payroll-tax savings to exceed those costs. A C-corp carries the most formality: a corporate return, board and shareholder governance, minutes, and the double-taxation accounting. The administrative weight is part of the decision, not an afterthought; the tax savings of an S-corp can evaporate against payroll and accounting fees at low profit levels.
It is worth putting numbers in context without pretending any single threshold fits everyone. The S-corp election only earns its keep once the payroll-tax savings from the salary-and-distribution split exceed the new costs it creates: a payroll service, a separate corporate tax return, and usually higher accounting fees. Below a certain profit level those costs swamp the savings, and the owner is paying for complexity that returns nothing. Above it, the math flips and the savings compound year after year. Because the break-even depends on the owner's profit, reasonable salary, and state, the right move is to run the numbers with a CPA rather than to assume the election is always or never worthwhile. The same caution applies to the C-corp, where the double-taxation cost has to be weighed against the specific benefits — reinvestment, fringe benefits, investor readiness — that justify it.
One more practical point ties the three together: changing tax classification is not a one-way door, but it is not friction-free either. An LLC can elect S-corp treatment and later revoke it, and a business can convert between forms as it grows, but each change carries paperwork, timing rules, and sometimes tax consequences on the way in or out. This is why the common advice is to start simple and elect up only when the facts clearly support it. Over-engineering the entity on day one — choosing a C-corp for a hobby business, or electing S-corp status before there is enough profit to matter — tends to create cost and complexity that the business has to unwind later. Matching the classification to the business as it actually is, and revisiting it as the business changes, keeps the structure working for the owner instead of the other way around.
Three-way comparison
| Factor | LLC (default) | S-corp election | C-corp |
|---|---|---|---|
| What it is | Legal entity | Tax classification | Tax classification / entity |
| Taxation | Pass-through, once | Pass-through, salary + distribution | Corporate tax, then dividends (double) |
| Self-employment tax | On full net profit | Only on the salary portion | Owner is a W-2 employee |
| Owners allowed | Unlimited, any type | Up to 100, U.S. individuals mostly | Unlimited, any type |
| Stock classes | Flexible membership units | One class only | Multiple classes |
| Fundraising fit | Limited for VC | Poor for VC | Built for VC |
| Admin burden | Lightest | Moderate (payroll + return) | Heaviest |
When each one makes sense
A default LLC fits the solo owner and the small partnership: anyone who wants liability protection, simple taxes, and minimal formality, and who is not yet profitable enough to benefit from a payroll-tax strategy. It is the right starting point for the large majority of new businesses. An S-corp election fits a profitable owner-operator whose net earnings have grown past the point where the self-employment tax on full profit clearly exceeds the cost of running payroll and filing a corporate return — at that level, the salary-and-distribution split saves real money. Critically, an LLC can elect S-corp tax treatment without converting to a corporation, so this is usually a tax election on an existing LLC rather than a new entity.
A C-corp fits companies that plan to raise venture capital, reinvest profits to grow rather than distribute them, offer meaningful fringe benefits, or position founders for QSBS treatment on a future exit. The double taxation that makes a C-corp a poor fit for a profit-distributing small business is largely irrelevant to a startup reinvesting everything and chasing scale. The practical decision tree is short: start as an LLC, elect S-corp tax treatment when profit makes it worthwhile, and choose C-corp from the outset only when outside equity or reinvestment is the actual plan. The entity and the tax election are separate levers, and matching each to the business as it actually operates is what keeps the structure efficient rather than ornamental.
Frequently asked questions
Is an S-corp a type of company or a tax status?
It is a tax classification, not a separate kind of company. An LLC or a corporation can elect S-corp tax treatment with the IRS. The election changes how the entity is taxed; it does not change the underlying legal entity formed with the state.
Can an LLC be taxed as an S-corp or C-corp?
Yes. A default LLC is taxed as a pass-through, but it can elect S-corp treatment or be taxed as a C-corp by filing the appropriate IRS election. This lets an owner keep the flexible LLC structure while changing only the tax treatment.
What is the tax advantage of an S-corp?
An S-corp splits an owner's pay into a reasonable salary and distributions, and only the salary is subject to self-employment-style payroll taxes. Above a certain profit level, that split can lower the total payroll-tax bill compared with a default LLC.
Why do startups use C-corps?
C-corps allow unlimited shareholders, multiple stock classes, and foreign and institutional investors, which is the structure venture capital expects. They also enable retained earnings at the corporate rate and potential QSBS treatment, making them the standard for venture-backed companies.
What is double taxation in a C-corp?
A C-corp pays corporate income tax on its profits, and then shareholders pay tax again on any dividends they receive. That two-layer taxation is the main drawback for a small business that distributes profits, though it matters less to a company reinvesting everything.
Which structure is best for a solo business?
A default LLC usually fits a solo business best: liability protection, simple pass-through taxes, and the lightest paperwork. As profit grows, electing S-corp tax treatment on that same LLC can make sense, while a C-corp generally only fits when outside equity is the plan.