The S-corp math: payroll costs vs SE-tax savings, honestly

The one-sentence answer, and the mechanism

An S-corp election can save a solo practitioner self-employment tax, but only once profit clears the cost of running it. Start with the tax at stake: a sole proprietor pays 15.3% self-employment tax on net earnings 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a self-employed clinician pays 15.3% self-employment tax on net earnings (12.4% Social Security up to the wage base, 2.9% Medicare beyond), the tax the S-corp split is designed to reduce on distributions.. An S-corp splits that income into a reasonable W-2 salary that still carries payroll tax and distributions that do not, so the savings equal roughly that 15.3% rate applied to the distribution slice, and nothing on the salary.

That split is the whole idea, and it is genuinely worth real money at the right income. It works only because the IRS lets distributions escape self-employment tax when the owner has first taken a reasonable salary 2Ref 2Internal Revenue Service (2026).S corporations.That an S corporation passes income through to shareholders and that a shareholder-employee must take reasonable compensation as W-2 wages before distributions, the constraint that both enables and caps the savings., which is also the constraint that caps the savings. The rest of this page is the arithmetic of when the split clears its costs, not a recommendation to make it.

Where the savings come from: SE tax and the wage base

The tax an S-corp is designed to reduce is self-employment tax. A sole proprietor or single-member LLC pays 15.3% on net earnings: 12.4% for Social Security up to an annually adjusted wage base, and 2.9% for Medicare with no ceiling 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a self-employed clinician pays 15.3% self-employment tax on net earnings (12.4% Social Security up to the wage base, 2.9% Medicare beyond), the tax the S-corp split is designed to reduce on distributions.. Above the wage base, only the 2.9% Medicare portion continues, so the rate you can save by shifting income into distributions is not constant, it steps down once your salary passes the Social Security cap.

That detail decides how much the split is worth. Below the wage base, each dollar moved from salary to distribution saves close to the full 15.3%; above it, the saving on that dollar is the 2.9% Medicare portion 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a self-employed clinician pays 15.3% self-employment tax on net earnings (12.4% Social Security up to the wage base, 2.9% Medicare beyond), the tax the S-corp split is designed to reduce on distributions.. The election never erases these taxes on your salary, only on the distribution above it, which is why a defensible salary that is too high can quietly shrink the benefit to nothing. The underlying meter is se tax, and it is worth understanding on its own before you model the split.

The reasonable-compensation floor

The ceiling on the savings is reasonable compensation. The IRS requires a shareholder-employee to take reasonable pay as W-2 wages before taking distributions, and that salary is not a number you get to minimize freely 2Ref 2Internal Revenue Service (2026).S corporations.That an S corporation passes income through to shareholders and that a shareholder-employee must take reasonable compensation as W-2 wages before distributions, the constraint that both enables and caps the savings.. Set it too low, and the agency can recharacterize distributions as wages, assess back payroll tax, and add penalties and interest, which erases the savings you were chasing and then some.

Reasonable is judged by what the work is worth: what you would pay someone else to do your job, given your role, hours, credentials, and the regional pay for that position. A prescriber running a full panel cannot pay themselves a clerk's wage and call the rest profit. Because the distribution is whatever is left after this salary, getting reasonable comp defensible, and documenting how you set it, is the single most important input to the entire model. It is also its own subject, worth reading before you pick a number.

The costs that eat the savings

Against the savings, put the real costs the election adds. Running payroll for yourself means a payroll service or accountant, quarterly and annual employment-tax filings, and the tax deposits the IRS expects once you have a W-2 employee, which is now you 3Ref 3Internal Revenue Service (2026).Understanding employment taxes.That an employer must withhold and deposit income tax, Social Security, and Medicare, plus federal unemployment tax, once it has a W-2 employee, the payroll costs the election adds when the owner goes on payroll.. A second tax return (the 1120-S) and more bookkeeping raise your accounting bill, and many states add a franchise tax, filing fee, or minimum tax on the entity itself.

One line in that table deserves emphasis: the salary you pay yourself carries the full FICA burden, both the employee and employer halves, so it is taxed essentially the way self-employment income was. Only the distribution above the salary is where anything is saved.

Running your own break-even

Here is the model in one line: annual FICA savings equals your self-employment tax rate times the distribution, where the distribution is net profit minus your reasonable salary; the election clears its costs when that saving exceeds the payroll, filing, and state costs above. Everything else is estimating those two quantities honestly for your own numbers, then subtracting.

As an illustration, not a recommendation: suppose a practice nets $150,000 and a defensible salary for the work is $90,000, leaving $60,000 as a distribution. Because that salary sits below the Social Security wage base, the distribution escapes roughly the full 15.3% self-employment rate, a saving on the order of nine thousand dollars before costs 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a self-employed clinician pays 15.3% self-employment tax on net earnings (12.4% Social Security up to the wage base, 2.9% Medicare beyond), the tax the S-corp split is designed to reduce on distributions.. Against it, subtract payroll, a second return, and state fees. Now raise the defensible salary to $120,000: the distribution falls to $30,000 and the saving roughly halves. The answer swings entirely on the two inputs you control least freely, your profit and your defensible salary.

A common rule of thumb puts the point where the election starts to pay somewhere in the low six figures of net profit, but a rule of thumb is not your number. The salary you can defend, your state's costs, and the two interactions in the next section move that break-even in both directions.

QBI and retirement: the two interactions that move the number

Two interactions can move the break-even enough to flip the decision, and both cut against the naive savings. The first is the qualified business income deduction: the deduction of up to 20% of qualified business income treats health-care providers as a specified service trade or business, so above a taxable-income threshold it phases out 4Ref 4Internal Revenue Service (2026).Qualified Business Income Deduction.That the QBI deduction allows up to 20% of qualified business income, with health-care providers treated as a specified service trade or business subject to a taxable-income phase-out, which interacts with the salary-versus-distribution split.. The second is retirement: in an S-corp, employer retirement contributions are tied to your W-2 wages, so a low salary can cap the plan you were counting on.

Why QBI cuts against the split. The W-2 wages you pay yourself reduce the business's qualified business income, and for a clinician whose income sits above the phase-out the deduction may already be limited or gone 4Ref 4Internal Revenue Service (2026).Qualified Business Income Deduction.That the QBI deduction allows up to 20% of qualified business income, with health-care providers treated as a specified service trade or business subject to a taxable-income phase-out, which interacts with the salary-versus-distribution split.. Lowering salary to boost distributions raises QBI in some ranges and interacts with the phase-out in others, which is exactly the kind of two-variable optimization that belongs in a spreadsheet with your CPA, not a rule of thumb.

Why retirement matters. A solo 401(k) lets an owner with no employees contribute as both employee and employer, but in an S-corp the employer contribution is a percentage of your W-2 wages, not your whole profit 5Ref 5Internal Revenue Service (2026).One-participant 401(k) plans.That a solo 401(k) covers an owner with no employees, where in an S-corp the employer contribution is a percentage of W-2 wages, so a low salary can cap the retirement contribution.. Push salary too low for FICA reasons and you may shrink the tax-advantaged retirement contribution you could otherwise make, a cost that never appears in the simple FICA-savings line.

The election mechanics and timing

If the math clears, the election itself is mechanical. An LLC does not have to become a corporation to be taxed as an S-corp; the S election is a tax classification layered on the entity you already have 6Ref 6Internal Revenue Service (2026).Limited liability company (LLC).That tax classification is separate from the state-law entity, so an LLC can elect S-corp taxation without becoming a corporation.. You make it on Form 2553, generally due within two months and fifteen days of the start of the tax year you want it to take effect, with late-election relief available when you miss that window for a reasonable cause 7Ref 7Internal Revenue Service (2026).About Form 2553, Election by a Small Business Corporation.That the S election is made on Form 2553, generally due within two months and fifteen days of the start of the tax year it is to take effect, with late-election relief available..

Practically, an existing single-member LLC can elect S-corp taxation for a given year by filing form 2553 in time, and a practice forming now can fold the decision into the startup budget rather than revisiting it later. Your state-law entity, your NPI, your payer contracts, and your bank account do not change; only the return you file and the payroll you now run do. The mechanics are the easy part, which is exactly why they should not drive the decision, the arithmetic should.

What to bring to the decision

Before you model it, gather four numbers, because they decide the answer more than any rule of thumb: your expected net profit, the salary you could defend for your actual role and hours, your state's entity costs, and your retirement-contribution plan. With those, the break-even is arithmetic; without them, it is guesswork dressed as a strategy.

• Worth modeling when: profit sits well above a defensible salary, the income is stable rather than a one-year spike, and you will actually run compliant payroll and file the extra return.
• Usually not worth it when: profit is near or below a defensible salary, the year is an outlier, or the plan quietly depends on lowballing your own salary.
• Fold in the whole picture: if your profit includes side income from teaching, supervision, or consulting, entity choices interact with that side income in ways worth naming to your advisor.

None of this is a recommendation to elect, or not to. It is the model a CPA runs, laid out so you arrive at that conversation already knowing which numbers decide it.