If you earn 1099 income, nobody withholds tax for you, and the tax bill is bigger than most first-time freelancers expect. There are two layers: self-employment tax, which replaces the payroll tax a W-2 employer would split with you, plus ordinary federal income tax on top. On $100,000 of net freelance profit, self-employment tax alone comes to $14,129.55. Add income tax and the combined bill for a single filer is roughly $25,700. This guide works through the exact formula so you can price your work and set money aside with confidence.
The self-employment tax formula
Self-employment tax is 15.3% in total: 12.4% for Social Security plus 2.9% for Medicare. But it does not apply to your full profit. Only 92.35% of net self-employment income is taxable, because the tax code gives you a 7.65% haircut as a rough offset for the employer share you never received.
Self-employment tax = 15.3% x 92.35% x net profit
Net profit means revenue minus deductible business expenses, not your gross billings. The Social Security portion (12.4%) only applies up to the 2026 wage base of $184,500 of net earnings; the Medicare portion (2.9%) has no cap. Very high earners also pay an extra 0.9% Medicare tax above $200,000 (single) or $250,000 (married filing jointly), but none of the examples below reach that threshold.
Worked example at $100,000 of net profit: taxable base is $100,000 x 92.35% = $92,350. Social Security tax is $92,350 x 12.4% = $11,451.40. Medicare tax is $92,350 x 2.9% = $2,678.15. Total self-employment tax: $14,129.55. Run your own numbers in the self-employment tax calculator.
Self-employment tax table for 2026
| Net freelance profit | Taxable base (92.35%) | Social Security (12.4%) | Medicare (2.9%) | Total SE tax | SE tax per quarter |
|---|---|---|---|---|---|
| $50,000 | $46,175.00 | $5,725.70 | $1,339.08 | $7,064.78 | $1,766.20 |
| $75,000 | $69,262.50 | $8,588.55 | $2,008.61 | $10,597.16 | $2,649.29 |
| $100,000 | $92,350.00 | $11,451.40 | $2,678.15 | $14,129.55 | $3,532.39 |
| $150,000 | $138,525.00 | $17,177.10 | $4,017.23 | $21,194.33 | $5,298.58 |
The quarterly column is the self-employment tax portion only, not your full quarterly payment. Your real estimated payment also includes income tax, which is covered below.
The deduction that softens the blow
You get to deduct one half of your self-employment tax from your income before computing federal income tax. It does not reduce the self-employment tax itself, but it lowers the income tax layer. At $100,000 of profit, half the SE tax is $7,064.78. If your marginal income tax rate is 22%, that deduction saves about $7,064.78 x 22% = $1,554.25 in income tax.
Business expenses are your biggest lever
Because SE tax applies to net profit, every legitimate deductible expense shrinks both tax layers at once. Say you bill $120,000 and spend $20,000 on software, equipment, phone, and home office costs. Your net profit is $100,000, so your SE tax is $14,129.55. If you could not deduct those expenses, SE tax on the full $120,000 would be $16,955.46. Tracking expenses saves $2,825.91 in SE tax alone, before any income tax savings. Keep receipts and a simple expense log all year; reconstructing them in April is where deductions get lost. If you also earn side income on top of a salaried job, the side hustle tax calculator estimates the extra tax on that income specifically.
1099 vs W-2 at the same pay
A W-2 employee earning $100,000 pays only the employee half of payroll tax: 7.65% x $100,000 = $7,650, because the employer quietly pays the other half. The freelancer at the same $100,000 pays $14,129.55, a gap of $6,479.55. After the half-SE-tax deduction saves about $1,554.25 at a 22% marginal rate, the net gap is still roughly $4,925.30. That is why a 1099 rate typically needs to be about 8 to 10% higher than the equivalent W-2 salary just to break even on taxes, before counting benefits a W-2 job adds, like employer health insurance, a 401(k) match, and paid time off. The full side-by-side comparison, including the break-even multiplier, is in the 1099 vs W-2 calculator.
Quarterly estimated payments: how much to set aside
Because nothing is withheld, the IRS expects quarterly estimated payments: generally April 15, June 15, September 15, and January 15 of the following year. For a single filer with $100,000 of net freelance profit, the combined bill (SE tax plus federal income tax after the standard deduction) is roughly $25,700, which works out to about $6,425 per quarter. The simple rule of thumb until you run your exact numbers: set aside 25 to 30% of every freelance dollar you receive, in a separate account, the day it lands. On $100,000, 25% is $25,000, close to the real combined bill. Estimate your own quarterly amount with the quarterly estimated tax calculator. Missing quarters can trigger an underpayment penalty, so paying roughly right four times a year beats paying exactly right once in April.
The bottom line: a $100,000 freelance year is not a $100,000 salary year. After roughly $25,700 in federal taxes, you keep about $74,300 before state tax, and you funded your own benefits on top of that. Know the $14,129.55 SE tax figure before you quote a rate. For the W-2 comparison, see how much tax you pay on a $100,000 salary.
FAQ
How much is self-employment tax on $100,000?
$14,129.55 for 2026: 12.4% Social Security on the $92,350 taxable base ($11,451.40) plus 2.9% Medicare ($2,678.15). That is only the self-employment tax; federal income tax is additional, bringing the combined bill to roughly $25,700 for a single filer.
Do I pay self-employment tax on gross income or net profit?
Net profit: revenue minus deductible business expenses, then 92.35% of that figure is subject to SE tax. On $120,000 billed with $20,000 of expenses, you pay SE tax on the $100,000 net, not the $120,000 gross, saving $2,825.91 in SE tax.
Is 1099 better than W-2 if the pay is the same?
Almost never on taxes alone. At $100,000, the freelancer pays $14,129.55 in payroll-type tax versus $7,650 for the W-2 employee, a gap of $6,479.55 before the half-SE-tax deduction. 1099 work can still win through higher rates and deductible expenses, but the rate needs to be roughly 8 to 10% higher to break even.
How much should I set aside for quarterly taxes?
25 to 30% of every freelance payment until you run exact numbers. For $100,000 of net profit, the combined federal bill is roughly $25,700, or about $6,425 per quarter. Quarterly due dates are generally April 15, June 15, September 15, and January 15 of the following year.
What if I have both W-2 and 1099 income in the same year?
Social Security tax caps at the $184,500 wage base across both income types combined, so W-2 wages already taxed for Social Security reduce the Social Security portion of your SE tax. Medicare has no cap and applies to both. Enter both income types in the calculators linked above rather than adding two separate results together.
How can I legally lower my 1099 tax bill?
Track every deductible business expense, since each dollar of expense cuts both SE tax and income tax. Retirement contributions for the self-employed, such as a SEP IRA or Solo 401(k), can also reduce taxable income significantly. An S corporation election changes the tax structure entirely and only makes sense above certain profit levels, so get professional advice before choosing it.
Estimates for planning only, not tax advice. Tax law and your filing status change the exact figures.