How to Calculate Self-Employment Tax

Freelancers pay both halves of Social Security and Medicare. Here's how to work out exactly what you owe for 2026.

By the CalcHeadquarters Editorial TeamUpdated June 20266 min read
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What Self-Employment Tax Is

When you work for an employer, you split Social Security and Medicare taxes with them. When you're self-employed, you pay both halves — a combined 15.3% (12.4% Social Security + 2.9% Medicare). This is separate from, and on top of, your income tax.

The Formula and the 92.35% Step

You don't pay the 15.3% on your full profit. First multiply your net self-employment income by 92.35% to get your "net earnings" — this mirrors the employer-side deduction employees get. Then apply 15.3% to that figure (Social Security up to the annual wage base, Medicare on all of it).

A Worked Example

Suppose your net self-employment income is $80,000. Net earnings = 80,000 × 0.9235 = $73,880. Social Security portion = 73,880 × 12.4% = $9,161. Medicare portion = 73,880 × 2.9% = $2,143. Total self-employment tax ≈ $11,304, of which about $5,652 is deductible. The self-employment tax calculator does this instantly.

The 2026 Social Security Wage Base

The 12.4% Social Security portion only applies to net earnings up to the annual wage base, which is $184,500 for 2026. Earnings above that owe only the 2.9% Medicare portion. If you also have a W-2 job, those wages use up part of the wage base first, so they aren't taxed twice.

Deducting Half and Paying Quarterly

You can deduct one-half of your self-employment tax on your income tax return, which lowers your taxable income (not the SE tax itself). Because no employer withholds for you, the IRS expects quarterly estimated payments in April, June, September, and January. A good habit is to set aside 25–30% of profit. Pricing your work? Our freelance rate calculator helps you build taxes into your rate.

Frequently Asked Questions

How much is self-employment tax for 2026?
It's 15.3% — 12.4% Social Security plus 2.9% Medicare — applied to 92.35% of your net business income. The Social Security portion applies up to the 2026 wage base of $184,500.
How do I calculate self-employment tax?
Multiply your net profit by 0.9235, then apply 15.3% (Social Security up to the wage base, Medicare on all of it). For $80,000 of net income, that's roughly $11,300.
Can I deduct self-employment tax?
Yes — you can deduct half of your self-employment tax as an above-the-line deduction on your income tax return. It reduces your taxable income but not the SE tax you owe.
Do I pay income tax on top of self-employment tax?
Yes. Self-employment tax funds Social Security and Medicare; income tax is calculated separately on your taxable income. Budget for both — many freelancers set aside 25–30% of profit.
When do I owe self-employment tax?
You owe it if your net self-employment earnings are $400 or more for the year, and the IRS expects quarterly estimated payments since there's no employer withholding.
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Self-Employment Tax Calculator →
Enter your net income to get your 2026 SE tax, the Social Security and Medicare split, and your deduction.

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Written & reviewed by the CalcHeadquarters Editorial Team
Every calculator is built from published formulas and authoritative sources, then independently checked for accuracy before it goes live. Last updated June 2026. Read our editorial policy & methodology.
Sources
  • IRS — Self-Employment Tax (Social Security and Medicare taxes)
  • Social Security Administration — Contribution and Benefit Base