- An LLC alone generally does not reduce tax. A single-member LLC is by default a disregarded entity — the income lands on Schedule C exactly as it would without one.
- S-Corp is an election, not an entity. An LLC files Form 2553 to be taxed as an S-Corp; the legal structure does not change.
- The savings come from splitting income into reasonable salary (subject to payroll taxes) and distributions (generally not subject to self-employment tax).
- Around $80,000 of net self-employment income is the commonly cited point where the election starts covering its own cost — payroll, a separate return, and bookkeeping.
- The salary has to be defensible. An unreasonably low salary paired with large distributions is the single most common way this goes wrong.
These are two different things
The framing "LLC vs S-Corp" is misleading, and it causes a lot of wasted money. An LLC is a legal entity formed under state law — it affects liability, not federal tax treatment by default. An S-Corp is a federal tax election made by filing Form 2553.
A single-member LLC is treated by default as a disregarded entity: its income and expenses flow onto the owner's Schedule C exactly as if the LLC did not exist. That is why forming an LLC and expecting a lower tax bill is one of the most common disappointments in this space. The liability protection is real; the tax effect on its own generally is not.
The same LLC can then elect S-Corp treatment. Nothing about the legal entity changes — only how the IRS taxes what it earns.
Where the actual savings come from
Without the election, essentially all net profit of a sole proprietorship or single-member LLC is subject to self-employment tax: 15.3% for 2026 — 12.4% Social Security up to the $184,500 wage base, plus 2.9% Medicare with no cap, and an additional 0.9% above $200,000 single or $250,000 MFJ.
With an S-Corp election, the owner becomes an employee. Profit splits into two pieces: a reasonable salary, which runs through payroll and carries Social Security and Medicare tax, and distributions, which are generally not subject to self-employment tax.
The savings are approximately 15.3% of whatever is legitimately taken as distribution rather than salary. That is the entire mechanism — there is no other magic in it.
Why the threshold exists
The election is not free. It typically brings a payroll system, quarterly payroll filings, a separate business tax return (Form 1120-S), a Schedule K-1, more involved bookkeeping, and often a higher accounting fee. Those costs are broadly fixed regardless of income.
That is why the commonly cited figure is around $80,000 of net self-employment income. Below it, fixed costs frequently consume the 15.3% savings on a relatively small distribution. Above it, the distribution grows while the costs stay flat, and the math generally turns favorable — increasingly so as income rises.
The figure is a rule of thumb, not a rule. State-level treatment matters — some states impose franchise taxes or do not recognize the election the same way — and so does how much salary is genuinely reasonable for the work being done.
The reasonable salary constraint
The IRS expects an S-Corp owner performing services to be paid reasonable compensation for that work before distributions are taken. This is the guardrail on the whole strategy, and it is where aggressive setups fail.
What is reasonable is generally judged on facts: what the role would cost to hire, the owner's training and experience, time devoted, what comparable businesses pay, and what the company can support. A course business generating $300,000 with the owner as the only operator paying themselves $20,000 is the textbook example of a position that is hard to defend.
There is no safe-harbor percentage, despite the ratios that circulate online. A CPA typically documents the basis for the salary figure at the time it is set, which is materially easier than reconstructing it later.
How §199A interacts
The §199A qualified business income deduction — up to 20% of qualified business income — applies to pass-through income including S-Corp income. OBBBA made §199A permanent, which removed the expiry that previously complicated multi-year planning.
It interacts with the salary decision in a way that is easy to miss: wages paid to the owner are generally not QBI, so raising salary can lower the QBI deduction even as it raises payroll tax. Below the 2026 thresholds — roughly $191,950 single and $383,900 married filing jointly — most qualifying businesses can take the full deduction. Above them, limitations phase in, and for specified service businesses the deduction can phase out entirely.
This is precisely why the salary number is usually modeled rather than picked. It moves payroll tax, income tax, and the QBI deduction simultaneously, and optimizing one in isolation commonly makes another worse.
Frequently Asked Questions
Does forming an LLC lower my taxes?
Generally no, by itself. A single-member LLC is treated by default as a disregarded entity, so its income and expenses flow onto the owner's Schedule C exactly as they would without the LLC. The same self-employment tax applies. An LLC changes legal liability exposure and can matter for banking, contracts and credibility — but the tax benefit people expect usually comes from a later S-Corp election, not from the LLC itself.
What is the difference between an LLC and an S-Corp?
They are different layers rather than alternatives. An LLC is a legal entity formed under state law. An S-Corp is a federal tax election, made by filing Form 2553, that changes how an entity's income is taxed. An LLC can elect to be taxed as an S-Corp while remaining an LLC legally. That is why the common framing of "LLC vs S-Corp" is misleading — most online businesses that use an S-Corp are an LLC that made the election.
At what income does an S-Corp make sense for an online business?
A commonly cited starting point is around $80,000 of net self-employment income, though the honest answer depends on the specifics. The election adds payroll processing, quarterly payroll filings, a separate Form 1120-S return, and heavier bookkeeping — costs that are broadly fixed. Below the threshold those costs often absorb the savings; above it the distribution portion grows while costs stay flat. State treatment and how much salary is genuinely reasonable both move the number.
What counts as a reasonable salary for an S-Corp owner?
There is no fixed percentage, despite ratios that circulate widely. Reasonableness is generally assessed on facts: what the role would cost to hire externally, the owner's experience and training, hours devoted to the business, what comparable businesses pay for similar work, and what the business can support. Most CPAs document the basis for the figure when it is set, since defending a number chosen years earlier is considerably harder than recording the reasoning at the time.
Can an S-Corp election hurt my §199A deduction?
It can, which is why the two are typically modeled together. Wages paid to the owner are generally not qualified business income, so increasing salary reduces the QBI base even while it increases payroll tax. Below the 2026 thresholds of roughly $191,950 single and $383,900 married filing jointly, most qualifying businesses can claim the full 20% deduction; above those, limitations phase in and specified service businesses can lose it entirely. Optimizing salary for payroll tax alone commonly makes the QBI outcome worse.
When is the deadline to elect S-Corp status?
Form 2553 is generally due within two months and fifteen days of the beginning of the tax year the election is to take effect. For an existing calendar-year entity electing for a full year, that typically lands in mid-March. Late-election relief exists in some circumstances under IRS procedures, but it is not automatic and is better avoided. A CPA can confirm the exact window for a specific entity and its formation date.
Authoritative Source
The reasonable-compensation requirement is the constraint the whole S-Corp strategy rests on. The IRS publishes the governing rules on its S Corporation Compensation and Medical Insurance Issues page. Figures and thresholds change between tax years, so it is generally worth confirming current numbers there or with a CPA rather than relying on any article, including this one.
Model the salary split before you file the election
The S-Corp decision comes down to one number — how much can legitimately be taken as distribution rather than salary. The calculator models that split at any income level. A TraderTax-matched CPA can confirm what is defensible for your actual business. Every situation varies.
Get Matched With a CPA Who Handles This →Disclaimer: Content is for informational purposes only and is not personalized tax, legal, or accounting advice. TraderTax is a platform that matches clients with independent tax professionals; it is not a tax firm. Tax outcomes vary with facts and circumstances — every situation varies. Confirm anything here with a qualified tax professional before acting on it.