Most entity advice starts from the wrong end. It compares an LLC to an S-corporation as if they were two items on the same menu, when one is a legal wrapper and the other is a tax election you can make inside it. Untangling that is half the decision. The other half is arithmetic, and the arithmetic in 2026 is different from what most articles on this subject still say.
This piece separates the two questions, runs the S-corp payroll-tax saving with real 2026 numbers including the part that usually gets left out, sets out when a C-corporation is actually the right answer, and covers the deadlines for changing your mind. It is written for an owner-managed business with one to a handful of owners, which is nearly everyone who searches for this.
Two questions, not one
Question one is legal. What entity exists under state law? For a small business the practical choices are a sole proprietorship (no entity at all), a limited liability company, or a corporation. This question is about liability protection, ownership records, and what your state charges to maintain the thing. In most states an LLC costs little to form and little to keep in good standing, which is why nearly every new owner-managed business is one.
Question two is tax. How does the IRS treat the entity's income? The Internal Revenue Code recognizes four answers: disregarded (income on your own Schedule C), partnership, S-corporation, or C-corporation. An LLC can be any of the four. A corporation can be an S-corp or a C-corp. The legal wrapper and the tax treatment are chosen separately, and the tax treatment can be changed later without touching the legal entity.
So the real question for most owners is not "LLC or S-corp." It is "should my LLC elect S-corp taxation," and, less often, "is there a reason to be a C-corporation." Take those in turn.
The default, and the number that drives everything
A one-owner LLC is taxed as if it did not exist. Profit lands on your Schedule C and the entire amount is subject to self-employment tax: 15.3% on 92.35% of net profit up to the Social Security wage base, which is $184,500 for 2026, then 2.9% Medicare above that, plus a further 0.9% once your earned income passes $200,000 (single) or $250,000 (joint). Half of the self-employment tax is deductible against income tax, which softens it slightly.
On $200,000 of profit that is $28,234 of self-employment tax before the income tax bill even starts. That figure is what the S-corp election attacks.
What the S-corp election actually does
An S-corporation pays its owner-employee a salary, which carries normal payroll taxes, and passes the rest of the profit through as a distribution, which carries none. The saving is the payroll tax that would otherwise have been paid on the distribution. That is the whole mechanism. Everything else about S-corps is either a condition attached to it or a consequence of it.
The condition is reasonable compensation. The salary has to be what you would pay someone else to do your job. The IRS has won every published case where an owner paid themselves a token salary and took the rest as distributions, and the penalty is reclassification of the distributions as wages, with payroll tax, interest and penalties on the difference. There is no safe-harbour percentage. A defensible salary is one you can support with market data for your role, hours and location, and the worksheet below walks through building that file.
The saving, with the part that usually gets left out
Take the $200,000 owner above, single, no other income, non-professional business, and set salary at $100,000. Most articles stop at the first line of the table.
Two things in that table deserve a closer look. The sole proprietor gets to deduct half of the self-employment tax, $14,117, while the S-corp deducts only the employer half of payroll tax, $7,650, so the S-corp's income tax base is higher before anything else happens. And the QBI deduction is 20% of business income after the owner's salary, so paying yourself $100,000 removes $100,000 from the base the deduction is calculated on. In this example that costs more than $15,000 of deduction.
Both effects scale with the salary you pay yourself. Which is the trap: the same pressure that makes a low salary attractive for payroll tax makes it attractive for QBI, and the IRS reasonable compensation standard is the only thing pushing the other way. Set the salary on the evidence, then run the numbers, not the reverse.
When the election is not worth it
Below roughly $60,000 to $80,000 of profit. A defensible salary consumes most of the profit, the saving shrinks toward zero, and the fixed administration costs do not. There is no precise cutover; the worksheet's break-even table produces one for your numbers.
When retirement contributions matter more than payroll tax. Employer contributions to a solo 401(k) or SEP are limited to 25% of W-2 salary in an S-corp, against 20% of net self-employment income for a sole proprietor. A $100,000 salary caps the employer contribution at $25,000. At $200,000 of Schedule C profit the equivalent figure is around $37,000. If you are trying to shelter as much as possible, the salary you chose for payroll tax reasons now limits you somewhere else.
When you are already above the Social Security wage base. Past $184,500 of earned income, the only payroll tax left to save is Medicare at 2.9% or 3.8%. The S-corp saving on the excess becomes small, and above the QBI thresholds the question turns into whether the S-corp's W-2 wages are what keeps your QBI deduction alive at all. That interaction is the subject of the QBI article, and it can push the answer either way.
When your state taxes S-corps. California charges 1.5% of net income, New York City and Tennessee have their own entity-level taxes, and several states do not recognize the election at all. Most states have no entity-level tax on S-corps and simply follow the federal election, which is one reason it is so common.
When a C-corporation is the right answer
The federal C-corp rate is a flat 21%, and it is permanent. Against a top individual rate of 37%, that looks compelling until you remember the second layer: distributing the profit as a dividend costs 15% or 20% plus the 3.8% net investment income tax, so fully distributed C-corp profit is taxed at roughly 37% to 40% combined. A pass-through owner in the top bracket pays 37%, or 29.6% with a full QBI deduction. For an owner who takes the profit out every year, the C-corporation loses.
It wins in three situations.
You are reinvesting rather than distributing. Profit retained inside the corporation is taxed once at 21% and can compound at that rate for years. This is the ordinary case for a business funding its own growth, and it is why the 21% rate matters to real companies even though it looks like a mirage to a consultant taking out every dollar. The limit is the accumulated earnings tax, a 20% penalty on retained earnings beyond the reasonable needs of the business, with a $250,000 safe amount ($150,000 for service businesses). A written plan for what the retained money is for keeps you clear of it.
You may sell the company, and it could qualify for Section 1202. Qualified small business stock is the largest exclusion in the code and it is available only to C-corporations. From July 2025 the exclusion cap is $15 million per issuer (or ten times basis), the company can have up to $75 million of gross assets when the stock is issued, and stock acquired after July 4, 2025 gets 50% of the exclusion after three years, 75% after four and 100% after five. Stock issued before that date keeps the old five-year, $10 million rule. The stock has to be acquired at original issuance, the business has to be active, and a long list of fields is excluded, including health, law, accounting, consulting, financial services and any business whose principal asset is the reputation or skill of its employees. A software, manufacturing, or product business planning a sale in five years should look at this seriously. A professional practice cannot use it.
You are raising outside money. Venture and institutional investors invest in C-corporations, almost always Delaware ones, because of preferred stock, stock options and the ability to hold shares in a fund. An S-corp cannot have a fund, a non-resident or another corporation as a shareholder, and is limited to one class of stock. If that path is plausible within a few years, start as a C-corp or convert before the round, and note that the Section 1202 holding period starts on the date the stock is issued by the corporation, not when the LLC was founded.
The costs of being a C-corp are the double tax on anything you do distribute, the loss of the QBI deduction entirely, and the difficulty of getting out: converting to an S-corp later triggers a five-year built-in gains tax on appreciation that existed at conversion, and liquidating a C-corp is a taxable sale of everything it owns.
The state angle
Most states follow the federal treatment of the election, tax pass-through income in the owner's hands, and levy no franchise or entity-level tax on LLCs or S-corps. Three state-level questions are worth asking wherever you are: whether your state taxes the entity itself (covered above), whether it offers a pass-through entity tax election, and whether it conforms to the federal QBI deduction.
Most states with an income tax now offer a pass-through entity tax election, which lets a partnership or S-corp pay state income tax at the entity level and deduct it federally as a business expense rather than as a capped itemized deduction. With the federal SALT cap at $40,400 for 2026 the election matters less than it did at $10,000, but the cap phases back down for modified AGI above $505,000, so owners at that level should still run it.
A few states require higher-income filers to add the federal QBI deduction back to state taxable income, and several others do not conform to it at all. Either one shrinks the deduction's value and shifts the S-corp arithmetic above in the election's favor. Whether that applies to your return depends on your state and your adjusted gross income, so treat it as a question for your CPA rather than a settled fact.
Changing your mind
The S-corp election is made on Form 2553, and to apply from the start of a tax year it must be filed within two months and 15 days of that year beginning: March 16, 2026 for a calendar-year business. A new LLC can file it with its formation and be an S-corp from day one. If you miss the date, Revenue Procedure 2013-30 offers late election relief for up to three years and 75 days after the intended effective date, provided you have been filing as an S-corp all along and can state a reasonable cause. In practice the relief is granted routinely.
An LLC choosing C-corp treatment files Form 8832 instead. Going from S-corp back to the default is a revocation, effective for the following year if filed after the 15th day of the third month, and once revoked you cannot re-elect for five years without IRS consent.
The one direction that is expensive is out of a C-corp, described above. Every other move is a form and a deadline.
The S-Corp Election Worksheet
A fill-in worksheet that runs your own numbers through the comparison above: eligibility checklist, a reasonable compensation file you can defend, the payroll-tax and QBI arithmetic side by side, the break-even profit for your costs, and the Form 2553 timeline.
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A rule of thumb, and what it misses
For an owner-managed business that distributes its profit: start as an LLC taxed as a sole proprietorship or partnership; elect S-corp once profit reliably clears the point where a defensible salary leaves a meaningful distribution, usually somewhere between $60,000 and $100,000 depending on your role; and stay there unless you are reinvesting heavily, planning a sale that could qualify for Section 1202, or raising outside capital, in which case become a C-corporation on purpose and early.
What that misses is the interaction with the QBI deduction above the 2026 thresholds, where an S-corp's W-2 wages can be the only thing that keeps the deduction alive, and the retirement plan ceiling, which the salary you choose sets. Both are covered in the pieces linked below, and both are why the decision is worth an hour with the numbers rather than a rule.