SE tax: the 15.3% and where it stops

Why you pay 15.3% and an employee pays half that

Self-employment tax is the Social Security and Medicare tax that an employee and employer normally split. As a solo practitioner you are both, so you pay both halves — a combined 15.3% on your net earnings from the practice 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.2Ref 2Internal Revenue Service (2026).Understanding employment taxes.That Social Security and Medicare tax normally split between employer and employee, which is why a self-employed clinician pays both halves as self-employment tax.. An employed clinician sees only their half withheld from each paycheck; the hospital quietly pays the matching half. Working for yourself, there is no one to match you.

Self-employment tax is not a penalty for going solo — it is the same payroll tax an employer and employee jointly fund, now landing entirely on you 2Ref 2Internal Revenue Service (2026).Understanding employment taxes.That Social Security and Medicare tax normally split between employer and employee, which is why a self-employed clinician pays both halves as self-employment tax.. It breaks into two statutory pieces:

The two together are the 15.3% figure 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates..

Where it stops: the Social Security wage base

The Social Security half of the tax applies only up to an annual earnings ceiling called the wage base; earn past it and that portion switches off for the rest of the year 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.. The Medicare half never stops — it applies to every dollar of net earnings, and high earners owe an additional Medicare amount above a threshold the IRS sets. So your marginal self-employment tax rate actually falls once you cross the wage base.

The wage base is set by law and rises most years, so look up the current figure rather than carrying last year's in your head 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.. For a practice whose income climbs mid-career, the crossing point matters: the first slice of profit is taxed at the full combined rate, and profit above the base carries only the Medicare portion.

The base it is charged on is net, not gross

Self-employment tax is charged on your net earnings from the practice — receipts minus ordinary and necessary business expenses — not on what patients paid you 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.3Ref 3Internal Revenue Service (2026).Guide to business expense resources.That ordinary and necessary practice deductions reduce net earnings, shrinking the self-employment-tax base as well as income tax.. Every legitimate deduction lowers the base twice over, because it reduces both income tax and self-employment tax. Malpractice premiums, licensure and board fees, supervision, continuing education, and mileage between sites all pull the number down 3Ref 3Internal Revenue Service (2026).Guide to business expense resources.That ordinary and necessary practice deductions reduce net earnings, shrinking the self-employment-tax base as well as income tax..

Net earnings from self-employment is a defined slice of your Schedule C profit; the Schedule SE computation makes the adjustment and also lets you deduct a portion of the self-employment tax itself against income 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.. Receipts from sessions — and from selling supplements or devices, if you do that — enter at the top; disciplined bookkeeping is what makes the net figure defensible.

On the return, Schedule SE does the arithmetic: it converts your Schedule C profit to net earnings from self-employment, applies the Social Security and Medicare rates, and produces the tax. It also generates an above-the-line deduction for the employer-equivalent half of what you paid, which lowers your income tax even though it does not reduce the self-employment tax itself 1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.. So the headline 15.3% overstates the true bite slightly once that deduction is counted — a reason to run the actual computation rather than eyeballing a flat percentage.

It is not income tax — and QBI does not touch it

Self-employment tax and income tax are two separate bills computed on the same profit, and it is easy to conflate them. The qualified business income deduction can cut up to 20% off the income-tax side, but it does nothing to the self-employment-tax side — SE tax is still figured on your full net earnings 4Ref 4Internal Revenue Service (2026).Qualified Business Income Deduction.That the section 199A QBI deduction reduces income tax but not the self-employment-tax base.1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.. Budget for both, because the QBI relief you see on your 1040 does not shrink the SE-tax line.

This is the single most common surprise for a clinician's first solo return: the income-tax number looks manageable after deductions and QBI, and then the self-employment-tax line adds a second, unindexed 15.3% bite on top. Model them as two stacked obligations from your first quarter, not one.

How you actually pay it: quarterly, no withholding

Because no employer withholds it, self-employment tax is remitted with your quarterly estimated payments — the same four installments that carry your income tax 5Ref 5Internal Revenue Service (2026).Estimated taxes.That self-employment tax carries no withholding and is paid through the same quarterly estimated installments as income tax, with an underpayment penalty when a quarter falls short.1Ref 1Internal Revenue Service (2026).Self-employed individuals tax center.That a solo clinician's Schedule C profit is self-employment income taxed at 15.3% on net earnings up to the Social Security wage base and the Medicare rate beyond, remitted through quarterly estimates.. There is no separate SE-tax bill and no separate schedule; you fold it into one estimated payment each quarter. A common working method is to set aside a fixed percentage of every deposit into a tax account, so the quarterly number is already sitting there.

Fall short of a safe-harbor floor and the shortfall is charged an underpayment penalty, computed quarter by quarter on Form 2210 — one more reason to fund each installment on time 5Ref 5Internal Revenue Service (2026).Estimated taxes.That self-employment tax carries no withholding and is paid through the same quarterly estimated installments as income tax, with an underpayment penalty when a quarter falls short.. Keep the payment confirmations with your return; tax retention rules mean you may need to prove what you sent, and when, years later.

A durable habit beats a year-end scramble. Many solo practices sweep a fixed share of every deposit — enough to cover income tax and the 15.3% together — into a separate tax account the same day the money lands. The quarterly payment then comes out of a balance already set aside, and a strong revenue month never turns into a spring cash crunch 5Ref 5Internal Revenue Service (2026).Estimated taxes.That self-employment tax carries no withholding and is paid through the same quarterly estimated installments as income tax, with an underpayment penalty when a quarter falls short.. Set the percentage a little high; a refund is easier to absorb than a surprise.

The S-corp election: the classic lever on SE tax

The most-discussed way to reduce self-employment tax is to elect S-corporation taxation. In an S corp, only the reasonable compensation you pay yourself as W-2 wages is subject to Social Security and Medicare tax; the remaining profit distributed to you as a shareholder is not 6Ref 6Internal Revenue Service (2026).S corporations.That in an S corporation only reasonable W-2 compensation is subject to Social Security and Medicare tax, while distributions are not, and that the compensation must be reasonable.. That is the s-corp math in one line — but the wages must be genuinely reasonable for your role, and the IRS scrutinizes owners who pay themselves too little.

An LLC by itself does not change any of this: a single-member LLC is taxed like a sole proprietor by default, so all your net earnings still carry self-employment tax 7Ref 7Internal Revenue Service (2026).Limited liability company (LLC).That a single-member LLC is taxed like a sole proprietor by default, so the S election — not the LLC itself — is what changes the self-employment-tax math.. It is the tax election on top of the entity — being taxed as an S corporation — that moves the math, not the LLC status alone. The election adds payroll filings and administrative cost, so it tends to earn its keep only above a certain profit level; run that tradeoff with your CPA rather than electing on a rule of thumb 6Ref 6Internal Revenue Service (2026).S corporations.That in an S corporation only reasonable W-2 compensation is subject to Social Security and Medicare tax, while distributions are not, and that the compensation must be reasonable..