What Self-Employment Tax Actually Is
As an employee you pay 7.65% of your pay toward Social Security (6.2%) and Medicare (1.45%). Your employer pays the other 7.65%, and you never see it. When you work for yourself, you are both. You pay 15.3%: 12.4% for Social Security and 2.9% for Medicare.
The IRS applies that rate to 92.35% of your net earnings, which adjusts for the employer half. Multiply 15.3% by 92.35% and you get about 14.1% of net profit. You owe it once your net earnings from self-employment reach $400.
Two limits matter. The Social Security part only applies up to the wage base, which is $184,500 in 2026. The Medicare part has no cap, and an additional 0.9% Medicare tax applies to earnings above $200,000 for single filers. The examples below leave out the additional Medicare tax.
The gap with a regular job is real. On $50,000 of pay, an employee pays $3,825 in payroll tax. A freelancer with $50,000 of net profit pays $7,065, or $3,240 more, because the employer half is now theirs.
What It Costs at Five Income Levels
These figures assume a single filer with no other income, the $16,100 standard deduction, no state tax, no credits and no qualified business income deduction. They are federal taxes only.
| Net profit | Self-employment tax | Federal income tax | Total | Share of profit |
|---|---|---|---|---|
| $30,000 | $4,239 | $1,178 | $5,417 | 18.1% |
| $50,000 | $7,065 | $3,396 | $10,461 | 20.9% |
| $80,000 | $11,304 | $7,527 | $18,830 | 23.5% |
| $120,000 | $16,955 | $15,705 | $32,660 | 27.2% |
| $200,000 | $28,234 | $33,346 | $61,580 | 30.8% |
Self-employment tax stays near 14.1% of profit at every level shown. Income tax is what climbs, because the brackets rise. Above the wage base the rate finally falls: at $250,000 of net profit, self-employment tax is $29,573, or 11.8%, because the Social Security part has stopped.
The $80,000 Example, Step by Step
1. Find the earnings subject to the tax. $80,000 × 92.35% = $73,880.
2. Apply the two rates. Social Security at 12.4% is $9,161. Medicare at 2.9% is $2,143. Self-employment tax is $11,304.
3. Deduct half of it. Half of $11,304 is $5,652, which comes off your income for income-tax purposes.
4. Find taxable income. $80,000 minus $5,652 minus the $16,100 standard deduction leaves $58,248.
5. Apply the 2026 brackets. Federal income tax on $58,248 is $7,527.
6. Add them up. $11,304 plus $7,527 is $18,830, or $1,569 a month.
What Lowers the Bill and What Does Not
Business expenses lower net profit, so they reduce both the self-employment tax and the income tax. That is why tracking them matters more than any other step.
The half-of-self-employment-tax deduction, retirement plan contributions and the qualified business income deduction all work on the income-tax side. None of them reduce the self-employment tax itself, which is calculated on net profit before those items. Eligibility and limits for each depend on your situation, so check the rules or ask a tax professional before you count on them.
If You Also Have a W-2 Job
Wages from a job use up the Social Security wage base first. With $60,000 of freelance profit and no other income, self-employment tax is $8,478. Add $150,000 of W-2 wages and the answer changes. Only $34,500 of room is left under the wage base, so Social Security tax applies to just $34,500 of the $55,410 in earnings subject to the tax. Self-employment tax drops to $5,885, a difference of $2,593. The Medicare part still applies to all of it.
Paying It During the Year
Because nothing is withheld, you pay as you go with estimated taxes. You generally need to if you expect to owe $1,000 or more when you file. For the 2026 tax year the four due dates are April 15, June 15, September 15 and January 15, 2027. When a date lands on a weekend or holiday, the deadline moves to the next business day.
To avoid the underpayment penalty, you generally need to have paid at least the smaller of two amounts: 90% of this year's tax, or 100% of last year's tax. If last year's adjusted gross income was above $150,000, the second figure becomes 110%. You can pay through your IRS online account, IRS Direct Pay or the IRS app, or by mail with Form 1040-ES.
On the $80,000 example, an even split is about $4,708 per quarter for federal tax. Add your state tax on top.
Three Ways It Catches People Off Guard
The first-year bill arrives all at once. A new freelancer has no prior-year tax to use as a guide and no withholding to soften April. The full year of self-employment tax and income tax comes due together.
It starts with the first dollar. Once net earnings reach $400, the 14.1% applies to all of them, not just the amount above some threshold, and there is no standard deduction against it.
Income-tax-only estimates run low. A freelancer who sets aside only the income-tax share is short by the self-employment tax, which is another 14.1% of profit.
Enter your own income, expenses and W-2 pay to see your full federal bill and a quarterly payment:
Self-Employment Tax Calculator →Disclaimer: This article is for educational purposes only and does not constitute tax, legal or financial advice. Figures use 2026 federal rules and a simplified single-filer example. Your tax depends on your state, deductions, credits and other income. Consult a qualified tax professional for your situation.