S-Corp vs Sole Proprietor: When the Self-Employment-Tax Savings Are Real

The S-corp election is a real self-employment-tax lever, but it only pays once your profit is high enough. On $120,000 of net profit that is almost all your own labor, a sole proprietor owes about $16,955 in self-employment tax. Split the same profit into a $70,000 salary plus a $50,000 distribution inside an S-corp and the payroll tax drops to about $10,710, a gross saving near $6,245 before the cost of running payroll and a second tax return. After those costs the election nets roughly $2,745 to $4,245 at this profit level, and it goes negative at low profit. Run your own figure in the Self-Employment Tax Calculator, then read this so you know where the break-even actually sits.

Why the salary is taxed and the distribution is not

Self-employment tax is Social Security and Medicare tax for people who work for themselves. The rate is 15.3%, made of 12.4% for Social Security and 2.9% for Medicare, and it applies to 92.35% of your net earnings once those earnings reach $400 (IRS Topic No. 554). A sole proprietor pays it on essentially all of their profit. There is no salary-versus-profit split to make, because every dollar of profit is self-employment income.

An S-corp changes the shape of the money. As a shareholder who also works in the business, you pay yourself a W-2 salary, and that salary carries Social Security and Medicare tax the same as any employee’s wages. What is left over can be paid out as a distribution of the company’s profit, and distributions are not wages, so they carry no Social Security or Medicare tax. That gap is the entire saving. On $50,000 of distribution instead of salary, you skip 15.3% of payroll tax, which is about $7,650.

There is a subtle catch worth naming, because it narrows the gap. Your sole-proprietor 15.3% runs on the reduced 92.35% base, but a W-2 salary is hit with the full 15.3% on every dollar, with no 92.35% haircut. So comparing the raw payroll tax on the salary against the sole-prop SE tax is the accurate way to size the saving, and it is a little smaller than “15.3% times the distribution” makes it look.

The reasonable-salary trap

Casual advice goes wrong at exactly this step. You cannot pay yourself a $10,000 salary on $120,000 of profit and call the other $110,000 a distribution. The IRS requires an S-corp to pay reasonable compensation to a shareholder-employee for the work they do before any non-wage distribution is made (IRS, S corporation compensation and medical insurance issues). Reasonable means it reflects what the job is actually worth.

The test the IRS uses is the source of the company’s gross receipts. Receipts that come from the shareholder’s personal services should be classified as wages. Receipts that come from other employees or from capital and equipment can support distributions. So a solo consultant whose revenue is entirely their own billable hours has very little room to shift income into distributions, while a business with staff and equipment doing the work has more.

If you set the salary artificially low, the IRS has the authority to reclassify distributions as wages and charge the back employment tax plus penalties. Courts have backed this repeatedly: an S-corp cannot avoid employment tax by labeling what is really wages as a distribution of net income (IRS, S corporation employees, shareholders and corporate officers). The salary decides the entire outcome. The $70,000 figure in the example below is illustrative, not a benchmark, and a CPA or enrolled agent should set the number for your specific facts.

The side-by-side on $120,000

Here is the same $120,000 of profit run two ways. The S-corp column assumes a $70,000 reasonable salary and a $50,000 distribution, which a CPA would need to confirm for real.

Read the split “better” marks the same way you would on a mortgage comparison. The S-corp wins on the tax line, cutting Social Security and Medicare tax from $16,955 to $10,710. The sole proprietor wins on cost and simplicity, because it has none of the S-corp’s added overhead. On $120,000 of profit the tax win is large enough to clear the overhead, and the election comes out ahead by roughly $2,745 to $4,245 after costs. That saving is why higher-earning solo businesses elect.

Where the break-even actually sits

The reason the election is not a blanket yes is that the saving shrinks fast as profit falls, while the cost stays roughly fixed. Below a certain profit the fixed cost eats the whole saving. Here is the same math at four profit levels, each with an illustrative reasonable salary.

At $50,000 of profit the gross saving is only about $945, so after roughly $2,750 of running cost the election loses about $1,805 a year. At $60,000 it still loses money. Somewhere around $80,000 it crosses into positive, and by $120,000 it clearly pays. That is why the savings only reliably outrun the cost once profit climbs past roughly the $40,000 to $80,000 zone and keeps going. The exact crossover depends entirely on the reasonable salary and your accounting bill, which is the whole reason to price it with a professional before electing. You can see the sole-prop side of every one of these rows for your own profit in the Self-Employment Tax Calculator.

The costs the saving has to clear

The S-corp overhead is real and mostly fixed, which is exactly why small profits do not clear it:

• Payroll. You have to actually run payroll for your salary, file the quarterly Form 941 and annual Form 940, and issue yourself a W-2. Most people pay a payroll service for this.
• A second tax return. An S-corp files its own Form 1120-S every year, separate from your personal 1040. That is more accountant time.
• More bookkeeping. The company’s books have to be clean enough to support the salary-versus-distribution split if the IRS ever asks.
• State unemployment tax. Your salary triggers federal and state unemployment tax (FUTA and SUTA), plus many states charge an S-corp franchise fee or minimum tax on top.

Bundled up, that tends to run about $2,000 to $3,500 a year for a solo S-corp. Those are the fixed dollars the payroll-tax saving has to beat before you are ahead.

One more wrinkle for high earners

The 12.4% Social Security piece only applies up to the annual wage base, which is $184,500 for 2026 (SSA). Above that, only the 2.9% Medicare portion keeps running, with no cap, and an Additional Medicare Tax of 0.9% kicks in on earnings above $200,000 for a single filer or $250,000 for a married couple filing jointly (IRS Topic No. 554). So once a sole proprietor’s profit passes the wage base, their marginal SE-tax rate drops from 15.3% to about 2.9%. That shrinks the gap the S-corp can close on the high end, because there is less Social Security tax left to avoid. The sweet spot for the election is the middle: comfortably above the break-even, but not so high that most of your income has already cleared the Social Security cap.

The caveat. This is general educational information, not tax or legal advice, and it is not a recommendation to elect S-corp status. Every dollar figure here is illustrative and uses the 2026 rate and wage-base numbers the calculator encodes; verify the wage base and thresholds against the IRS and SSA before you rely on them, since they change yearly. The example treats the owner as bearing both halves of the 15.3% payroll tax, which is the right economic view for an owner-operator even though a paycheck splits it into a 7.65% employee share and a 7.65% employer share. It leaves out the QBI (Section 199A) deduction, state income and franchise taxes, and the effect of a lower salary on your future Social Security benefit and retirement-plan contributions, any of which can move the answer. The reasonable salary is fact-specific and is the one number you should not guess. A CPA or enrolled agent should set it and run the full comparison before you file anything.

Price your own sole-proprietor baseline in the Self-Employment Tax Calculator, then take that number to a professional to model the S-corp split. For the mechanics underneath all of this, the self-employment tax explained guide walks through the 15.3% and the 92.35% base line by line, 1099 vs W-2 taxes covers why contractors owe both halves of FICA in the first place, and the taxes for gig and self-employed hub ties the quarterly-payment and deduction pieces together.