LLC self-employment tax
The single biggest surprise for a new LLC owner is rarely the income tax. It is self-employment tax — a separate 15.3% levy on business profit that a salaried employee never sees on a paystub. Understanding where it comes from, why it exists, and the one election that reliably reduces it is the difference between a manageable tax bill and a nasty April shock.
None of this is tax advice. The figures below are for 2026, the wage base and thresholds change every year, and anything material to a specific return should be confirmed with a CPA.
Why a pass-through LLC owes self-employment tax
A default LLC is a pass-through entity. A single-member LLC is taxed as a sole proprietorship and a multi-member LLC as a partnership, which means the business itself pays no federal income tax. Instead, the profit flows through to the owner’s personal return and is taxed there — whether or not the owner actually withdrew the money.
That flow-through profit is treated as self-employment earnings. When someone works a regular job, the employer withholds Social Security and Medicare tax from each paycheck and quietly pays a matching amount on the worker’s behalf. A business owner is both the employer and the employee, so the owner pays both halves. That combined amount is self-employment tax.
The 15.3% breakdown
Self-employment tax is not a single flat rate. It is two distinct taxes stacked together, and a third surcharge that kicks in only at higher incomes.
| Component | Rate | Applies to |
|---|---|---|
| Social Security | 12.4% | Net earnings up to the annual wage base |
| Medicare | 2.9% | All net earnings, with no cap |
| Combined SE tax | 15.3% | Earnings up to the wage base |
| Additional Medicare | +0.9% | Earnings above the high-income threshold |
The Social Security portion (12.4%) only applies to net earnings up to a yearly ceiling called the wage base, which the Social Security Administration raises most years for inflation. Earnings above that ceiling escape the Social Security tax entirely. The Medicare portion (2.9%) has no cap; it applies to every dollar of net self-employment income. On top of that, an additional 0.9% Medicare tax applies to earnings above a high-income threshold (for 2026, generally $200,000 for a single filer and $250,000 for a married couple filing jointly). There is no employer match on that extra 0.9%.
One more wrinkle softens the math: self-employment tax is calculated on roughly 92.35% of net business profit, not 100%, because the law lets an owner first subtract the employer-equivalent share before applying the rate.
The half-SE-tax income deduction
Because a regular employer’s share of payroll tax is a deductible business expense, the tax code gives self-employed people a parallel break. An LLC owner can deduct one half of the self-employment tax paid when calculating adjusted gross income. This is an above-the-line deduction, so it reduces income tax whether or not the owner itemizes.
It is important to read this deduction correctly. It does not cut the self-employment tax itself — the full 15.3% is still owed. It only reduces the income tax by lowering taxable income by half the SE-tax amount. It softens the overall burden but does not change the SE-tax line on the return.
How this differs from W-2 withholding
A salaried worker has Social Security and Medicare automatically withheld and never writes a check for them. The employer pays the matching half invisibly. A business owner sees the whole thing at once. Two practical consequences follow.
- The full burden is visible. What an employee experiences as a 7.65% deduction, an owner pays as the full 15.3% — both halves out of pocket.
- Nothing is withheld for you. There is no payroll department setting money aside. An LLC owner is expected to make quarterly estimated tax payments covering both income tax and self-employment tax, and underpaying triggers penalties.
This combination — a tax that feels twice as large and arrives with no automatic withholding — is why the bill blindsides so many first-year owners.
Single-member vs multi-member LLCs
The way self-employment tax lands depends on how the LLC is taxed. A single-member LLC is a disregarded entity by default; the owner reports profit on Schedule C and pays SE tax on the net amount. A multi-member LLC is taxed as a partnership by default, and here a distinction matters: a member who actively participates in the business (a general partner in substance) generally owes SE tax on their distributive share of profit, while a purely passive investor may not. The rules for limited partners and passive members are technical and have been the subject of ongoing IRS attention, so a multi-member LLC with a mix of active and passive owners should have a CPA determine which shares are subject to the tax rather than assuming a clean answer.
How SE tax interacts with the QBI deduction
Self-employment tax does not exist in a vacuum. Many pass-through owners also claim the qualified business income (QBI) deduction, which can shelter a portion of business profit from income tax. It is worth keeping the two straight: the QBI deduction reduces income tax but does not reduce self-employment tax, and the deduction for half of self-employment tax actually lowers the QBI base slightly. The practical point is that an owner cannot use the QBI deduction to escape the 15.3% — SE tax is computed first and stands on its own. The two simply operate on different layers of the same return.
The S-corp election: the main lever to lower SE tax
The most common tool for reducing self-employment tax is electing to have the LLC taxed as an S corporation. The LLC stays an LLC for legal purposes; only its tax treatment changes. Under an S-corp election, the owner becomes an employee of the business and the profit splits into two streams.
- A reasonable salary paid to the owner as W-2 wages. This portion is subject to Social Security and Medicare tax, just like any paycheck.
- Distributions of the remaining profit. These are not subject to self-employment or payroll tax.
The savings come from shifting profit out of the SE-taxable salary bucket and into the distribution bucket. The catch is the word reasonable. The salary must reflect what the work is genuinely worth in the market — the IRS scrutinizes owners who pay themselves an artificially low wage to dodge payroll tax. An S-corp also adds payroll filings, a separate return, and bookkeeping cost, so it usually only makes sense once profit is high enough that the SE-tax savings clear those expenses. The full trade-off is covered in the LLC vs. S-corp comparison.
A worked example
Suppose an LLC nets $120,000 in profit. As a default pass-through, roughly $110,800 (about 92.35%) is subject to SE tax, producing a self-employment tax of around $16,900 — and the owner deducts about half of that against income tax.
Now assume the same owner elects S-corp treatment and pays a reasonable salary of $70,000, leaving $50,000 as a distribution. Payroll taxes apply to the $70,000 salary (around $10,700 in combined Social Security and Medicare), while the $50,000 distribution carries no SE or payroll tax. The roughly $6,000 difference is the SE-tax savings — before subtracting payroll-service and extra-return costs. The example is illustrative only; actual numbers depend on the year’s wage base, the salary chosen, and state rules.
Quarterly estimated payments in practice
Because no employer is withholding tax, the burden of paying as income is earned falls on the owner. The IRS expects quarterly estimated payments that together cover the year’s income tax and self-employment tax, with deadlines in April, June, September, and the following January. Underpaying through the year can trigger an underpayment penalty even if the full balance is paid by the filing deadline.
A workable system is to set aside a fixed percentage of every deposit — many solo owners reserve somewhere around 25% to 35% depending on bracket and state — into a separate account, then pay estimates from that reserve each quarter. Owners using a safe-harbor approach can base estimates on the prior year’s tax to avoid penalties even when the current year’s income is hard to predict. The exact safe-harbor percentages and thresholds are set by the IRS and should be confirmed for the current year.
State-level differences
Self-employment tax itself is a federal tax, so the 15.3% does not change from state to state. But the surrounding picture does. Some states impose their own taxes or fees on LLCs — an annual franchise tax, a gross-receipts tax, or a flat LLC fee — that stack on top of the federal SE tax and income tax. A few localities add their own self-employment-style levies. The S-corp election can also play out differently at the state level, since not every state honors the federal S-corp treatment the same way. An owner weighing the structure should factor in the specific state’s treatment, not just the federal math.
Why it surprises new owners
New owners often plan around income-tax brackets and forget that self-employment tax sits on top of them. A 22% income-tax bracket plus 15.3% SE tax is an effective marginal rate well above what the bracket alone suggests. Because nothing is withheld and the bill is only tallied at filing, the shortfall lands all at once — and it can be especially jarring in a strong first year when profit climbs faster than expected. The defenses are straightforward: set aside a percentage of every deposit for taxes, make quarterly estimated payments, track profit through a dedicated business account so the year’s number is never a mystery, and revisit the S-corp question with a CPA as profit grows. Treated as a known, planned-for cost rather than a surprise, self-employment tax becomes just another line in the budget instead of an April emergency.
Frequently asked questions
What is the self-employment tax rate for an LLC?
The combined rate is 15.3% — 12.4% for Social Security on earnings up to the annual wage base, plus 2.9% for Medicare with no cap. An additional 0.9% Medicare tax applies to earnings above the high-income threshold. The tax is calculated on about 92.35% of net business profit.
Does an LLC pay self-employment tax even if I leave the money in the business?
Yes. A default pass-through LLC taxes the owner on the full net profit regardless of whether it was withdrawn. Leaving cash in the business bank account does not defer the self-employment tax on that profit.
Can I avoid self-employment tax by forming an LLC?
No. Forming a default LLC does not reduce self-employment tax — a single-member LLC is taxed like a sole proprietorship. The most common way to lower it is electing S-corp tax treatment, which splits profit into a reasonable salary and distributions that escape SE tax.
What does the half-self-employment-tax deduction do?
It lets an owner deduct one half of the self-employment tax paid when calculating adjusted gross income. It reduces income tax but does not reduce the self-employment tax itself — the full 15.3% is still owed.
How much can an S-corp election really save?
It depends on profit and the reasonable salary. Savings come from the distribution portion escaping SE tax, but payroll filings, a separate return, and bookkeeping cost offset some of it. It typically becomes worthwhile only once profit is high enough to clear those added costs; a CPA should run the numbers.
Do I need to make quarterly payments for self-employment tax?
Generally yes. There is no employer withholding for a self-employed owner, so the IRS expects quarterly estimated payments covering both income tax and self-employment tax. Underpaying through the year can trigger penalties.
Related guides
- How is an LLC taxed?
- LLC vs. S-corp
- LLC tax deductions