Self-Employment Tax, Explained: What It Is and How to Legally Pay Less
Short answer: Self-employment tax is a 15.3% federal tax, 12.4% for Social Security and 2.9% for Medicare, that self-employed people pay on their net business profit. It's the self-employed version of the payroll taxes a W-2 employee and their employer split down the middle. The catch: when you own the business, you pay both halves. In 2026, the Social Security portion applies only to the first $184,500 of earnings; Medicare has no cap. The single most powerful legal way to reduce it is the S corp election.
If self-employment tax is the biggest line on your tax bill and you've never questioned it, this is the page to read.
Key takeaways
Self-employment (SE) tax is 15.3% on your net profit — 12.4% Social Security + 2.9% Medicare. It's separate from, and on top of, income tax.
It's the self-employed version of payroll tax. As an employee you pay half; as an owner you pay both halves.
It's actually calculated on 92.35% of your net profit, and you get to deduct half of the tax against your income tax.
In 2026 the Social Security portion stops at $184,500 of earnings; Medicare keeps going (plus an extra 0.9% above $200K single / $250K married).
Sole proprietors, partners, and default-LLC owners pay it on every dollar of profit. S corp owners pay payroll tax only on their salary — that's the lever.
Retirement contributions lower your income tax, not your SE tax — a myth worth killing.
The biggest legal way to cut SE tax is the S corp election.
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Note: The dollar figures in this article are hypothetical illustrations for educational purposes only. They are not a prediction or guarantee of your results. Your actual numbers depend on your specific facts and circumstances.
Who actually pays self-employment tax?
| Business type | You pay SE / payroll tax on... |
|---|---|
| Sole proprietor | All net profit |
| Partnership (general partner) | All net profit (your share + guaranteed payments) |
| LLC (default, no election) | All net profit |
| S corporation | Only your W-2 salary — distributions are exempt |
| C corporation | Only wages paid to you (company profit taxed separately) |
| W-2 employee | Half — your employer pays the other half |
What Is Self-Employment Tax (and Why You Pay Both Halves)?
Every working person in the country pays into Social Security and Medicare. For employees, it's quiet, it comes out of the paycheck as "FICA," and here's the part most people never notice: the employer secretly pays an equal amount on top. You pay 7.65%, your employer pays 7.65%, and the government collects 15.3% total on your wages.
When you're self-employed, there's no employer standing behind you. You are the employer. So you pay both halves yourself, the full 15.3%. That combined tax has a name: self-employment tax.
This is the number that catches new business owners completely off guard. You had a profitable year, you set aside money for "income tax," and then self-employment tax shows up as a whole separate bill you didn't budget for. It's not income tax. It's not a penalty. It's the Social Security and Medicare you'd have split with an employer if you'd stayed a W-2 employee, now landing entirely on you.
How Much Is Self-Employment Tax? (2026 Rate Breakdown)
The headline rate is 15.3%, and it splits into two parts:
12.4% for Social Security — but only up to a yearly earnings ceiling. For 2026, that ceiling is $184,500. Earnings above it aren't hit with the Social Security portion. The most anyone pays into the Social Security side as a self-employed person in 2026 is $22,878.
2.9% for Medicare — with no cap at all. Every dollar of profit is subject to it. And if your earnings top $200,000 (single) or $250,000 (married filing jointly), an extra 0.9% Additional Medicare Tax stacks on above that line.
So below the wage base, you're paying the full 15.3%. Once your earnings pass $184,500, the Social Security portion switches off, and you're only paying the 2.9% Medicare piece (plus the 0.9% surtax if your income is high enough). That's why the tax doesn't just scale up forever in a straight line.
How Self-Employment Tax Is Calculated
Two details trip almost everyone up.
First, it's not calculated on 100% of your profit. You multiply your net profit by 92.35% first, then apply the 15.3%. (The logic: an employee's share of payroll tax isn't counted as part of their own wages, so the tax code gives the self-employed a rough equivalent.)
Second, you get to deduct half of it. The "employer half" of your SE tax comes back as an above-the-line deduction against your income tax. It doesn't reduce the SE tax itself, but it softens the overall hit.
Here's what that looks like in real numbers:
Example: $100,000 net profit
Taxable base: $100,000 × 92.35% = $92,350
Self-employment tax: 15.3% × $92,350 ≈ $14,130
You'd then deduct about $7,065 against your income tax.
That $14,130 lands before a single dollar of federal income tax. On its own, it's often the biggest tax a profitable owner-operator pays.
Who Has to Pay Self-Employment Tax?
If your business profit flows onto your personal return as ordinary self-employment income, you're paying it. That covers:
Sole proprietors (filing a Schedule C)
General partners in a partnership
Single- and multi-member LLC owners who never filed a different tax election — because a default LLC is taxed as a sole proprietorship or partnership
Who doesn't pay it the same way:
S corporation owners pay payroll tax only on the salary they take. The remaining profit comes out as distributions, which are not subject to SE or payroll tax. (This is exactly why the S corp election is such a big deal: here's how the S corp election works and what it saves.)
C corporation owners pay payroll tax only on wages; the corporation's profit is taxed under a separate system.
If you're not sure which bucket you're in, pull last year's return: a Schedule C means sole proprietor, a K-1 from Form 1065 means partnership, a K-1 from Form 1120-S means you're already an S corp.
How to Legally Reduce Your Self-Employment Tax
This is the part worth slowing down for, because there's a lot of bad information out there.
1. The S corp election (the big lever). This is the one that actually moves the number. When you elect S corp status, your profit splits into a reasonable salary (still subject to payroll tax) and distributions (not subject to it). For an owner with steady profit above roughly $80,000, that can mean several thousand dollars a year in saved SE tax. Keep in mind it's not automatic, and it's not free; you have to run payroll and file a separate return, but it's the single most effective legal reduction available. We break down the full S corp math, the salary rules, and when it makes sense here.
2. Capture every legitimate business deduction. SE tax is calculated on net profit. Every legitimate deduction you're entitled to lowers that net number, and therefore lowers the tax. This isn't a loophole; it's just making sure you're actually claiming what you've earned the right to claim.
3. Know what does not reduce it. Here's the myth worth killing: retirement contributions do not reduce your self-employment tax. Funding a solo 401(k) or SEP IRA can be a great move, it lowers your income tax, but SE tax is calculated before those contributions come out, so it doesn't touch that line. Anyone telling you to "max your retirement to lower your SE tax" is mixing up two different taxes.
The honest summary: for reducing self-employment tax specifically, the S corp election is the lever that matters, and clean deductions do the rest.
Don't Forget Quarterly Estimated Taxes
One practical trap: self-employment tax isn't withheld from a paycheck, so the IRS expects you to pay it in quarterly estimated payments throughout the year, alongside your income tax. Miss them, and you can owe underpayment penalties on top of the tax. If your first profitable year sneaks up on you, this is often where the pain shows up.
Filing vs. Planning — The Bigger Point
Your CPA files your Schedule SE accurately every spring. That's their job, and it matters. But filing is backward-looking; it reports what already happened.
Reducing self-employment tax is a forward-looking job. The S corp election, your salary level, how your entity is structured, those decisions have to be made during the year to change what the bill looks like. By the time you're filing in March, the year is already closed, and the number is already the number.
That's the gap. And whether you're here in the Salt Lake Valley or running a business anywhere in the country, it's a gap worth closing before year-end, not discovering after.
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It's 15.3%, 12.4% for Social Security plus 2.9% for Medicare. The Social Security portion applies only to the first $184,500 of earnings in 2026; Medicare has no cap, and a 0.9% surtax applies above $200,000 (single) or $250,000 (married filing jointly).
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You take your net business profit, multiply it by 92.35%, and apply the 15.3% rate to that amount. You then deduct half of the resulting tax against your income tax. On $100,000 of profit, that's roughly $14,130 in SE tax.
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Yes, by default. A single-member LLC is taxed as a sole proprietorship and a multi-member LLC as a partnership, so all profit is subject to SE tax. Filing an S corp election changes how that profit is taxed.
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The most effective legal option is the S corp election, which lets part of your profit come out as distributions that aren't subject to SE tax. Claiming every legitimate business deduction also helps by lowering net profit. Retirement contributions do not reduce SE tax.
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No. Self-employment tax funds Social Security and Medicare and is calculated separately, on top of your income tax. You can owe SE tax even in a year when your income tax is low.
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It's paid through quarterly estimated tax payments during the year and reconciled on Schedule SE with your annual return. Because nothing is withheld for you, missing the quarterly payments can trigger underpayment penalties.
About the author
Daniel Allgaier, CFP® is the founder of Artstone Private Wealth, a fee-only, fiduciary, tax-led financial planning firm. He's the author of Take Charge of Your Equity Comp and works with small business owners who have a CPA filing their taxes but no one planning them. Blue-collar roots, plain-spoken approach, based in Utah's Salt Lake Valley and serving business owners nationwide.
This article is for educational purposes only and is not tax, legal, or investment advice. The examples are hypothetical illustrations, not guarantees of any specific result. Tax rules change and every situation is different — consult a qualified tax professional about your own circumstances. DMA Management, LLC dba Artstone Private Wealth is a registered investment adviser. Registration does not imply a certain level of skill or training.
