What is self-employment tax and how is it calculated? (2026)
Self-employment tax is the 15.3% tax that freelancers, contractors, and gig workers pay on their net business profit. It covers Social Security and Medicare — the same programs funded by payroll taxes on W-2 workers, except you pay both the employee and employer share. Here's the exact 2026 calculation.
What self-employment tax actually is
When you work as an employee, your employer withholds 7.65% from your paycheck for Social Security and Medicare, and then pays another 7.65% on your behalf. You see the employee portion on your pay stub; the employer portion is invisible to you.
When you're self-employed, there's no employer. So you pay both halves — the full 15.3%. This is self-employment tax. It is separate from and in addition to federal income tax.
The tax is calculated on Schedule SE, which attaches to your Form 1040 alongside Schedule C.
2026 rates and wage base — confirmed IRS and SSA figures
| Component | Rate | 2026 cap |
|---|---|---|
| Social Security | 12.4% | First $184,500 of net earnings |
| Medicare | 2.9% | No cap — applies to all earnings |
| Additional Medicare (high earners) | 0.9% | Earnings above $200k (single) / $250k (married) |
| Standard combined rate | 15.3% | Up to $184,500 |
The Social Security wage base increased to $184,500 for 2026, up from $176,100 in 2025. This means self-employed people with high earnings pay Social Security tax on an additional $8,400 of income compared to 2025 — roughly $1,042 more in maximum Social Security tax.
The exact calculation formula
The IRS doesn't simply apply 15.3% to your net profit. There's a two-step adjustment that works in your favor:
Step 2: Taxable SE earnings × 0.153 = Self-employment tax
Step 3: SE tax ÷ 2 = Above-the-line deduction on Form 1040
The 0.9235 multiplier (92.35%) exists because W-2 employees don't pay income tax on their employer's matching FICA contribution. The IRS gives self-employed people equivalent treatment through this adjustment — essentially, you don't pay SE tax on the "employer half" of what you'd be paying.
Real example: $65,000 net profit
A freelance developer earns $65,000 net on Schedule C in 2026:
$60,028 × 0.153 = $9,184 self-employment tax
$9,184 ÷ 2 = $4,592 deductible from Form 1040
Net SE tax cost: $9,184 (with $4,592 offset through AGI reduction)
At a 22% income tax rate, the $4,592 AGI deduction saves an additional $1,010 in income tax. So the real out-of-pocket SE tax cost is closer to $8,174.
SE tax at different income levels (2026)
| Net profit | SE tax owed | AGI deduction | Effective cost at 22% |
|---|---|---|---|
| $20,000 | $2,826 | $1,413 | $2,515 |
| $40,000 | $5,652 | $2,826 | $5,030 |
| $65,000 | $9,184 | $4,592 | $8,174 |
| $100,000 | $14,129 | $7,065 | $12,574 |
| $184,500 | $26,076* | $13,038 | $23,191 |
*At $184,500 net profit, Social Security tax reaches its maximum. Income above this only faces the 2.9% Medicare portion.
Five ways to legally reduce self-employment tax
- Maximize business deductions. SE tax is calculated on net profit. Every dollar of legitimate deduction reduces both income tax and SE tax. The mileage deduction, home office, and health insurance deduction all reduce your SE tax base. See our complete deductions list and expense tracking guide to make sure you're capturing everything.
- Contribute to a retirement account. A SEP IRA or Solo 401(k) contribution reduces your adjusted gross income — and for the SEP IRA, contributions are calculated after the SE tax deduction, creating a cascading reduction effect.
- Claim the SE tax deduction. The 50% AGI deduction described above is automatic when you file Schedule SE. Make sure your tax software is capturing it.
- Consider S-Corp election at higher incomes. When net self-employment income consistently exceeds $75,000–$80,000, electing S-Corp status allows you to split income between a salary (subject to SE tax) and distributions (not subject to SE tax). The tax savings can exceed $5,000–$10,000/year, though compliance costs apply.
- Hire your spouse. Paying a spouse who genuinely works in the business creates a deductible payroll expense that reduces net profit and therefore SE tax — while building their Social Security record.