S-Corp vs. Sole Proprietor:
Which One Saves You More Tax?
A sole proprietor pays self-employment tax on every dollar of profit; an S-corp pays it only on a reasonable salary. On the same income the S-corp can save thousands — but only once profit clears the cost of running one. Here's the math, side by side.
A sole proprietor pays self-employment tax on every dollar of profit; an S-corp pays payroll tax only on a reasonable salary and nothing on the rest.That one difference is the whole game. On the same profit, the S-corp can save thousands a year — but only once the profit is high enough to clear the added cost of running one. Here's the real math, side by side.
By Jason Anderson
Co-Founder, 406 Consulting Group
Big-firm tax background with a Six Sigma discipline for systems and job costing.
Why does the S-corp pay less tax?
As a sole proprietor (a Schedule C business), your entire net profit is hit with self-employment tax — about 15.3% (Social Security and Medicare) up to the Social Security wage base of $184,500 in 2026, then 2.9% above it. There's no way to carve any of it out.
As an S-corp, you split your pay: a reasonable salary that gets the ~15.3% payroll tax, and distributions that don't. The profit you take as distributions skips self-employment tax entirely. That's the saving — and it's completely legal, as long as the salary is genuinely reasonable for the work you do.
The same business, both ways
Take a contractor with $120,000 of net profit. Run it as a sole proprietor, then as an S-corp paying a $70,000 reasonable salary:
Sole proprietor
Self-employment tax on ~92.35% of $120,000 of profit.
~$16,950
SE tax on all of it
S-corp
Payroll tax on a $70,000 salary; $50,000 in distributions, no SE tax.
~$10,710
Payroll tax on salary only
That's about $6,200 less in payroll/SE tax — before you subtract the cost of running the S-corp. Illustrative; your number depends on your profit, your salary, and your state.
The catch: the S-corp isn't free
That ~$6,200 isn't all profit. An S-corp has to run payroll, file its own return (Form 1120-S), and sometimes pay a state fee — typically $1,500–$4,000 a year in added cost a sole proprietor never has. Net it out and our contractor still comes out a few thousand ahead. But at, say, $45,000 of profit, those same costs would swallow the savings whole — which is why a sole proprietor is often the right answer at lower income.
See the full breakdown of what an S-corp costs in How Much Does It Cost to File S-Corp Taxes?
So which one should you be?
Stay a sole proprietor while profit is modest and simplicity is worth more than a small saving. Switch to an S-corp once profit is consistently high enough — often around $80,000–$100,000 — that the self-employment-tax savings clearly beat the added cost. The honest answer is “run the numbers,” because the same election is a win for one business and a waste for another.
Our S-Corp Calculator estimates your saving from your own profit, and Should You Elect S-Corp? The Real Math walks the full decision.
Sole prop or S-corp — which wins for you?
We'll run your real numbers and give you a straight answer, not a sales pitch.
FAQ
Is an S-corp always better than a sole proprietor?
No. An S-corp only wins once your profit is high enough that the self-employment-tax savings on your distributions beat the added cost of running one — payroll, a separate 1120-S return, and any state fee. For many owners that's somewhere around $80,000–$100,000 of net profit. Below that, a sole proprietor is simpler and often cheaper overall.
How much can an S-corp save versus a sole proprietor?
It depends on your profit and your reasonable salary. On $120,000 of profit with a $70,000 salary, the payroll/SE-tax difference is roughly $6,000 a year before costs — and a few thousand after you subtract the cost of running the S-corp. More profit taken as distributions (with a defensible salary) means more savings; less profit means less, until it isn't worth it.
Do I have to form a corporation to become an S-corp?
Not necessarily. 'S-corp' is a tax election, not a business type. Most small businesses are an LLC that elects S-corp tax status by filing Form 2553 — you keep the LLC and just change how it's taxed. You don't have to dissolve your business or form a traditional corporation to get the S-corp tax treatment.
This article is general tax education, not advice for your specific situation. The figures are illustrative; your outcome depends on your profit, salary, and state. Confirm with a qualified tax professional.
The bottom line
A sole proprietor pays ~15.3% self-employment tax on all profit. An S-corp pays it only on a reasonable salary — saving thousands, but only once profit clears the added cost of running one (often ~$80K–$100K).
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