The one thing to get straight first
"S corp" is a tax election. "LLC" is a business entity. They are not parallel choices. An LLC is formed under state law; how it is taxed is a separate decision. An LLC can be taxed as a disregarded entity, a partnership, or — by filing Form 2553 with the IRS — as an S corporation. A corporation can also elect S status.
So the real question is almost always: should my LLC keep its default tax treatment, or elect S corporation taxation? Everything below assumes that framing.
How a default LLC is taxed
A single-member LLC is "disregarded" for federal tax purposes — its profit flows straight onto the owner's personal return (Schedule C). A multi-member LLC is taxed as a partnership (Form 1065, with K-1s to members). Either way, the headline number is the self-employment tax: 15.3% on net earnings (12.4% Social Security up to the annual wage base, plus 2.9% Medicare), on top of income tax.
That 15.3% applies to essentially all of the business's profit. For a business netting $80,000, that's roughly $12,240 in SE tax before income tax even enters the picture. This is the number the S election is trying to shrink.
What the S election changes
An S corporation is a pass-through like a partnership — profit flows to owners' personal returns, no corporate-level tax. The difference is how owner compensation is split:
- Reasonable salary (W-2). An owner who works in the business must be paid a reasonable salary as an employee. That salary is subject to payroll taxes (the same 15.3%, split between employer and employee).
- Distributions. Remaining profit can be distributed to owners without self-employment tax. It is still subject to income tax.
The tax saving is the SE tax avoided on the distribution portion. The cost is everything required to do this legitimately: running payroll, filing payroll tax returns quarterly, filing Form 1120-S annually, and maintaining the corporate formalities the election assumes.
The breakeven logic owners use
Think of it as a tradeoff with fixed costs on one side and a percentage saving on the other:
- Fixed costs of the S election: payroll service, quarterly payroll filings, the 1120-S return, and typically professional fees. Commonly discussed as a few thousand dollars a year all-in, varying by market.
- Saving: roughly 15.3% of (profit minus reasonable salary).
At modest profits, the fixed costs eat the saving. As profit grows well beyond what a reasonable salary for the role would be, the math increasingly favors the election. Where exactly the line falls depends on the salary the IRS would consider reasonable for the work — which is also the part that draws scrutiny, so aggressive low-salary strategies are the classic way owners get in trouble.
Form your LLC the right way
If you decide an LLC fits, formation services handle the state filing, registered agent, and paperwork — including S-corp election filings.
Partner link. We may earn a referral fee if you connect with a provider. Details
Factors beyond the tax math
- State taxes. Some states impose entity-level taxes or fees that change the math (a few states tax S corps or LLCs specifically). State rules vary widely — check yours.
- Ownership flexibility. S corporations have strict ownership rules: generally US individuals only, no partnerships or corporations as shareholders, one class of stock, 100-shareholder cap. LLCs taxed by default have none of these constraints.
- Benefits and fringe. S corp owners with more than 2% ownership face limits on certain fringe benefits (like health insurance deductions) that work differently than in other structures.
- Exit and basis. How you eventually sell or wind down the business interacts with entity choice in ways that dwarf a single year's SE tax saving. Long-term planning matters more than the first-year math.
The honest bottom line
Default LLC taxation is simpler and cheaper to run. The S election can save meaningful SE tax for profitable, owner-operated businesses — at the price of payroll, filings, and ongoing discipline. The decision interacts with state law, ownership plans, and benefit needs, which is why generic "always elect S corp at $X profit" rules are unreliable.
If you're weighing this for a real business, the highest-value next step is a conversation with a tax professional who can model your numbers — not a YouTube rule of thumb.
Model it with a tax pro
Answer a few questions about your business and get connected with a licensed tax professional who works with businesses like yours. Comparing options is free.
Partner link. We may earn a referral fee if you connect with a provider. Details
Frequently asked questions
Is an S corp better than an LLC?
Neither is universally better — they solve different problems. An LLC is simpler and more flexible; an S corporation election can reduce self-employment tax for profitable owner-operated businesses, but it adds payroll and compliance costs. The right answer depends on profit level, how involved the owner is day-to-day, and state tax rules. This is exactly the kind of decision worth discussing with a tax professional.
Can an LLC be taxed as an S corp?
Yes. This is one of the most misunderstood points: "S corp" is a tax election, not a business entity type. An LLC can elect S corporation tax treatment by filing Form 2553 with the IRS (with deadlines and eligibility rules). A corporation can also elect S status. So "LLC vs S corp" is really "default LLC taxation vs S corporation election."
What is the reasonable salary rule?
If an S corporation owner works in the business, the IRS requires the business to pay them a "reasonable salary" as a W-2 employee before taking tax-free distributions. The salary is subject to payroll taxes; distributions beyond it generally are not subject to self-employment tax. What counts as "reasonable" depends on the role, industry, and location — there is no IRS formula, which is why this area draws scrutiny.
How much does it cost to maintain an S corp election?
Beyond state fees, the main ongoing costs are payroll processing (you must run payroll for the owner-employee), a separate business tax return (Form 1120-S), and usually professional help to stay compliant. These fixed costs are why the S election tends to make sense only above a certain profit level — the payroll-tax savings have to exceed the compliance costs.