Written by the TaxPlain Editorial Team · Reviewed for accuracy · Last updated August 2026
⚠️ Educational only. TaxPlain does not provide tax, legal, or financial advice. Always consult a qualified tax professional about your specific situation.
What this is
Self-employment tax is the Social Security and Medicare tax you pay when you work for yourself. When you're a W-2 employee, your employer withholds half of these taxes from your paycheck and pays the other half on your behalf. When you're self-employed, there's no employer to split the bill — so you cover both halves yourself.
The technical name is SECA (Self-Employment Contributions Act), and it's effectively the same funding mechanism as FICA, the payroll tax that funds Social Security and Medicare for traditional employees. For the 2026 tax year, the self-employment tax rate is 15.3% — 12.4% for Social Security and 2.9% for Medicare — applied to 92.35% of your net self-employment earnings, not the full amount.
That 92.35% multiplier exists to put self-employed taxpayers on roughly equal footing with employees. A traditional employer deducts its half of FICA taxes as a business expense before your wages are ever taxed; the multiplier gives self-employed people a comparable adjustment. The 12.4% Social Security portion only applies up to the annual wage base, $184,500 for 2026 — earnings above that are subject only to the 2.9% Medicare portion, which has no cap. High earners may also owe an additional 0.9% Medicare surtax on self-employment income above $200,000 (single) or $250,000 (married filing jointly).
This is a completely separate tax from federal income tax, even though both are calculated on the same underlying business profit.
Who it affects
✓ Applies to
Freelancers, independent contractors, gig workers, sole proprietors, and single-member LLC owners with net self-employment earnings of $400 or more in the year.
↑ Also applies to
People with a full-time W-2 job who also have self-employment or side-business income — the two are tracked separately, and the $400 threshold applies to your self-employment earnings alone.
📅 QUARTERLY PAYMENTS
Self-employment tax isn't withheld from anything, so most self-employed people need to pay it (along with estimated income tax) in quarterly installments throughout the year using Form 1040-ES, rather than as one lump sum at filing time.
The disambiguation
Self-Employment Tax vs. Income Tax: What's the Difference?
These are two separate bills calculated on the same business profit, and mixing them up is the single most common source of confusion for people filing self-employment income for the first time. Both ultimately flow through your Form 1040, but they work very differently.
What they fund — self-employment tax funds Social Security and Medicare specifically. Income tax funds general federal spending.
How they're calculated — self-employment tax is a mostly flat 15.3% rate (until the Social Security portion caps out). Income tax is progressive, rising through brackets based on your total taxable income after deductions and credits.
Where they start — your net profit from Schedule C is the shared starting point, but it splits from there: Schedule SE calculates your self-employment tax, while the same profit also lands on your 1040 to be taxed as ordinary income.
When you owe them — you can owe self-employment tax in a year you owe little or no income tax. Self-employment tax kicks in as soon as net earnings cross $400, regardless of your income tax bracket or deductions.
How they connect — you can deduct half of your self-employment tax as an above-the-line deduction when calculating your income tax, which softens the overlap slightly, but it doesn't make them the same tax.
Common income sources — this shows up most often for anyone receiving 1099-NEC income from freelance or contract work, in addition to any Schedule C business income.
Related forms often involved
Self-employment tax rarely appears on its own — it's usually one piece of a small cluster of forms that work together.
Schedule C — calculates your net business profit, which is the starting point for self-employment tax
Schedule SE — calculates the actual self-employment tax owed, using your Schedule C profit
1099-NEC — the most common way self-employment income gets reported to you and the IRS
Form 1040-ES — used to pay self-employment and income tax in quarterly estimated installments
Common mistakes to avoid
⚠️ Budgeting for income tax only
Many first-year freelancers set aside money for income tax and get blindsided by an additional 15.3% self-employment tax bill on top of it.
⚠️ Skipping quarterly payments
Waiting until filing season to pay everything at once, rather than making quarterly estimated payments, can trigger an underpayment penalty even if you pay in full by the deadline.
What to do right now
If you're newly self-employed, set aside roughly 25-30% of your net profit for combined self-employment and income tax, rather than budgeting for income tax alone. If you have net earnings of $400 or more, plan for quarterly estimated payments rather than one large bill in April.
Questions to ask your tax professional
01Given my income mix, would an S-Corp election meaningfully reduce my self-employment tax?
02How should I calculate my quarterly estimated payments to cover both taxes accurately?
03How does my W-2 income affect the Social Security portion of my self-employment tax?
04Which retirement contributions could reduce my overall tax bill this year?
05Am I combining all my self-employment income sources correctly when checking the $400 threshold?
Frequently asked questions
Do I have to pay self-employment tax if I get a 1099?
Yes, if your net self-employment earnings from that 1099 income are $400 or more for the year. A 1099-NEC just reports the income; it's your net profit after business expenses that determines whether you owe self-employment tax.
Do I pay self-employment tax if I have an LLC?
If your LLC is a single-member LLC taxed as a sole proprietorship (the default), yes, its profit is subject to self-employment tax just like a sole proprietor's. If you've elected S-Corp taxation for the LLC, only your reasonable salary is subject to self-employment-style taxes, not the full profit.
Do I owe self-employment tax on S-Corp income?
Not on the profit distributions. S-Corp owners pay themselves a reasonable salary, which is subject to regular FICA withholding, but additional profit distributed to shareholders is generally not subject to self-employment tax. This is a major reason some self-employed people consider an S-Corp election.
Do I still pay self-employment tax if I have a full-time W-2 job?
Yes, on your self-employment earnings specifically. Your W-2 wages and self-employment income are treated separately for this purpose, though your W-2 wages do count first toward the annual Social Security wage base, which can reduce the Social Security portion of your self-employment tax.
Do I pay self-employment tax on side income or a side business?
Yes, once your net earnings from all self-employment sources combined reach $400 for the year. It doesn't matter if it's your main income or a side hustle — the IRS combines all your self-employment activity to check against the $400 threshold.