If you earn money working for yourself — as a freelancer, contractor, sole proprietor, gig worker, or small business owner — you owe self-employment tax in addition to regular income tax. Self-employment tax covers Social Security and Medicare contributions, and it’s often the biggest tax surprise new freelancers face. This guide explains the 15.3% rate, the half-deduction that softens it, and how the tax fits into your overall federal tax picture.
What self-employment tax actually is
Self-employment (SE) tax is the self-employed equivalent of FICA taxes withheld from a regular paycheck. When you work for an employer, FICA splits 50/50: you pay 7.65% (6.2% Social Security + 1.45% Medicare) and your employer pays a matching 7.65%. The combined 15.3% funds Social Security and Medicare benefits.
When you’re self-employed, you are both the worker and the employer — so you pay the full 15.3% yourself. This applies to your net self-employment earnings (gross income from your business minus deductible business expenses), not your gross revenue.
The 15.3% breakdown
- 12.4% Social Security tax on earnings up to the annual Social Security wage base ($176,100 in 2025; the base adjusts each year)
- 2.9% Medicare tax on all net self-employment earnings (no cap)
- Additional 0.9% Medicare tax on earnings above $200,000 (single) or $250,000 (married filing jointly)
The 92.35% adjustment
The SE tax doesn’t apply to 100% of your net earnings — it applies to 92.35% of them. The reasoning: employees don’t pay FICA on their employer’s share of FICA, so to keep self-employed taxpayers on similar footing, the IRS lets you reduce your net earnings by 7.65% (the employer-equivalent share) before calculating SE tax. If your net self-employment income is $50,000, your SE tax base is $50,000 × 0.9235 = $46,175. Multiply that by 15.3% and you owe about $7,065 in self-employment tax.
The half-deduction
The IRS lets you deduct half of your self-employment tax (the “employer half”) when calculating your adjusted gross income. This is an above-the-line deduction — you take it whether you itemize or take the standard deduction. In the example above, your $7,065 SE tax produces a $3,532 deduction on your federal income tax return. This reduces your overall tax bill but doesn’t change your SE tax owed.
Who owes self-employment tax
You generally owe self-employment tax if your net earnings from self-employment are $400 or more in a year. Common situations that trigger SE tax:
- Freelance or contract work (you receive a Form 1099-NEC or 1099-K)
- Sole proprietorship or single-member LLC income
- Income from a side business reported on Schedule C
- Rideshare driving, food delivery, or gig platform work
- Income as a general partner in a partnership
Some situations do NOT trigger SE tax:
- Regular wages from a W-2 employer (FICA is already withheld)
- Rental real estate income (reported on Schedule E, not subject to SE tax for most landlords)
- Investment income (dividends, interest, capital gains)
- Hobby income that doesn’t rise to the level of a business
Self-employment tax and Social Security benefits
Paying SE tax isn’t purely a cost — it’s also how self-employed workers build credit toward Social Security retirement and Medicare benefits. The Social Security Administration tracks your earnings; you generally need 40 quarters (10 years) of covered earnings to qualify for retirement benefits and premium-free Medicare Part A.
How to pay self-employment tax
SE tax is reported on Schedule SE (“Self-Employment Tax”) and added to your federal income tax bill on Form 1040. You don’t pay it as a lump sum at filing time — instead, the IRS requires self-employed taxpayers to make quarterly estimated tax payments throughout the year to cover both income tax and SE tax. Missing these payments can result in underpayment penalties.
Reducing self-employment tax legally
You can’t avoid SE tax on legitimate self-employment income, but you can reduce it by:
- Tracking business expenses thoroughly. Every deductible business expense reduces your net SE earnings and the SE tax that applies to them.
- Contributing to a SEP-IRA or Solo 401(k). These reduce income tax but do not reduce SE tax (still calculated on pre-retirement-contribution earnings).
- Restructuring as an S corporation — for higher earners only. An S corp can pay you a “reasonable salary” (subject to FICA) and distribute remaining profit as dividends (not subject to SE/FICA tax). This requires more paperwork and accountant fees, so the math has to work.
Common self-employment tax mistakes
- Forgetting to set aside money for SE tax (rule of thumb: save 25–30% of net income for federal taxes)
- Missing quarterly estimated payments and getting hit with underpayment penalties
- Not deducting legitimate business expenses, leading to a higher SE tax base than necessary
- Confusing SE tax with income tax — you owe both
Further Reading
- Quarterly Estimated Taxes Explained
- How Income Tax Works
- Tax Forms Cheat Sheet
- What Is a 1099?
- Retirement Planning for the Self-Employed
This article is for general educational purposes only and does not constitute tax or financial advice. Tax laws and dollar amounts change yearly — verify current rules with the IRS (irs.gov) or consult a qualified tax professional before making decisions.