What Is Self-Employment Tax?
Self-employment tax is the Social Security and Medicare tax paid by freelancers, sole proprietors, independent contractors, and single-member LLC owners. As a self-employed person, you pay both the employee and employer portions of FICA taxes — a combined rate of 15.3% on your net self-employment income. W-2 employees only pay half (7.65%) because their employer covers the other half. This is one of the most significant financial differences between self-employment and traditional employment.
SE tax applies to net self-employment income, not gross revenue. First deduct all legitimate business expenses on Schedule C. The remaining net profit is your self-employment income. SE tax is then calculated on 92.35% of that amount (the remaining 7.65% represents the "employer's share" concept, keeping the math equivalent to what employees pay).
The SE Tax Rate Breakdown
The 15.3% SE tax rate consists of two components:
- Social Security tax: 12.4% on net SE income up to the Social Security wage base ($168,600 in 2024). Income above this threshold is not subject to Social Security tax.
- Medicare tax: 2.9% on all net SE income with no cap. An additional 0.9% Medicare surtax applies to SE income exceeding $200,000 for single filers ($250,000 for married filing jointly).
On $80,000 of SE income: 92.35% × $80,000 = $73,880 subject to SE tax. Total SE tax = $73,880 × 15.3% = $11,294.
The Deductible Half: Your Built-In Tax Break
The IRS allows self-employed taxpayers to deduct 50% of their SE tax as an above-the-line deduction when calculating federal income tax. This mirrors the fact that W-2 employees don't pay taxes on the employer's FICA contribution (which isn't part of their taxable wages). On $11,294 in SE tax, you can deduct $5,647 from your gross income before applying income tax brackets. This deduction reduces your income tax but not the SE tax itself.
Quarterly Estimated Tax Payments
Unlike W-2 employees who have taxes withheld each paycheck, self-employed individuals must pay taxes quarterly — typically by April 15, June 15, September 15, and January 15. Failing to make adequate estimated payments results in underpayment penalties. The safe harbor rule: pay at least 100% of last year's tax liability (110% if AGI exceeded $150,000) to avoid penalties, even if you owe more at filing. This calculator divides your estimated annual tax by four to show your approximate quarterly payment obligation.
Strategies to Reduce Self-Employment Tax
- Maximize business deductions. Every dollar of legitimate business expense reduces net SE income and thus your SE tax. Home office, vehicle use, equipment, professional development, software, and health insurance are common deductions.
- Self-employed health insurance deduction. 100% of health insurance premiums for you, your spouse, and dependents are deductible above-the-line — reducing both income tax and, indirectly, your AGI for other deductions.
- SEP-IRA or Solo 401(k) contributions. Self-employed individuals can contribute up to 25% of net SE income to a SEP-IRA (up to $69,000 in 2024) or even more through a Solo 401(k). These contributions reduce taxable income significantly.
- S-Corporation election. At higher income levels (typically $60,000+ in net SE income), electing S-Corp status can reduce SE tax by splitting income between a "reasonable salary" (subject to payroll taxes) and distributions (not subject to SE tax). This requires additional complexity and accounting costs.
- Track everything meticulously. The IRS expects self-employed taxpayers to maintain records. Every business expense that goes untracked is money left on the table in taxes.