What Is Self-Employment Tax?
Self-employment tax is a 15.3% tax that covers Social Security and Medicare contributions for people who work for themselves. If you are a freelancer, independent contractor, sole proprietor, or earn income reported on a 1099 form, this tax applies to you. It is the self-employed equivalent of the FICA taxes that W-2 employees and their employers split evenly.
The 15.3% rate breaks down into two components: 12.4% for Social Security and 2.9% for Medicare. When you work for an employer, you pay only half of this amount (7.65%) through payroll withholding, and your employer pays the other half. As a self-employed individual, you are both the employer and the employee, so you pay the full 15.3%.
Self-employment tax applies to anyone with net self-employment earnings of $400 or more per year. This threshold is remarkably low, which means even part-time freelancers and side-hustle earners are often subject to it. There is also an additional 0.9% Medicare surtax on self-employment income above $200,000 for single filers or $250,000 for married couples filing jointly, bringing the Medicare portion to 3.8% on high earnings.
Understanding self-employment tax is critical because it often catches new freelancers off guard. Many first-time 1099 workers budget only for income tax and are surprised when SE tax adds thousands of dollars to their bill. Use our Self-Employment Tax Calculator to estimate your SE tax liability based on your net earnings.
How to Calculate Self-Employment Tax
Calculating self-employment tax involves three straightforward steps. First, determine your net self-employment income by subtracting all allowable business expenses from your gross self-employment revenue. This is the number reported on Schedule C (or Schedule K-1 for partnerships) that flows into Schedule SE.
Second, multiply your net SE income by 92.35% (0.9235). The IRS applies this reduction factor to approximate the employer-equivalent portion of FICA — effectively giving you a slight discount before applying the tax rate. This adjustment exists because W-2 employees do not pay FICA on the employer's share of the tax, so the IRS provides a parallel benefit to the self-employed.
Third, apply the 15.3% rate to the adjusted amount. However, be aware that the Social Security portion (12.4%) is capped at $176,100 in 2025. Any net SE income above that threshold is subject only to the 2.9% Medicare tax (plus the 0.9% surtax above $200,000/$250,000).
Here is a concrete example. Suppose you have $80,000 in net self-employment income. Multiply $80,000 by 0.9235 to get $73,880. Then multiply $73,880 by 15.3% to get $11,304. That is your total self-employment tax for the year — $11,304 in Social Security and Medicare taxes alone, before any income tax is calculated.
The SE Tax Deduction: How to Reduce Your Bill
The IRS provides a valuable offset for self-employed workers: you can deduct 50% of your self-employment tax as an above-the-line deduction on your Form 1040. This deduction reduces your adjusted gross income (AGI), which in turn reduces your income tax. It does not reduce your SE tax itself, but it compensates for the fact that W-2 employees never pay income tax on the employer's half of FICA.
Continuing the example above, if your SE tax is $11,304, you can claim a $5,652 above-the-line deduction. If you are in the 22% marginal tax bracket, this deduction saves you an additional $1,243 in income tax. The deduction effectively reduces the sting of paying both halves of FICA, though it does not eliminate the cost entirely.
This deduction is claimed on Schedule 1, line 15, and it is available regardless of whether you itemize or take the standard deduction. Because it is above-the-line, it also lowers your AGI, which can help you qualify for other income-dependent tax benefits such as the premium tax credit, education credits, and IRA contribution deductibility.
Quarterly Estimated Tax Payments: What Freelancers Must Know
Unlike W-2 employees who have taxes withheld from every paycheck, self-employed workers must make quarterly estimated tax payments directly to the IRS. You are required to make these payments if you expect to owe $1,000 or more in federal tax (including both income tax and SE tax) when you file your return.
The four quarterly due dates for the 2025 tax year are April 15, June 16, September 15, and January 15 of the following year. Each payment should cover approximately one quarter of your total expected annual tax liability. You submit payments using Form 1040-ES, either online through IRS Direct Pay or EFTPS, or by mailing a check with a payment voucher.
The IRS offers two safe harbor methods to avoid underpayment penalties. You can pay at least 100% of your prior year's total tax liability spread across four equal payments, or you can pay at least 90% of your current year's tax liability. If your prior year AGI exceeded $150,000 ($75,000 if married filing separately), the safe harbor rises to 110% of prior year tax.
Failing to make adequate quarterly payments results in an underpayment penalty, calculated as interest on the shortfall for each quarter. The penalty rate is tied to the federal short-term rate plus 3 percentage points. Use our Quarterly Tax Calculator to estimate your quarterly payment amounts and stay on schedule.
The QBI Deduction: A 20% Deduction for Self-Employed Workers
The Qualified Business Income (QBI) deduction under Section 199A allows eligible self-employed individuals to deduct up to 20% of their qualified business income from their taxable income. This deduction was introduced by the Tax Cuts and Jobs Act and made permanent by the OBBBA. It is one of the most powerful tax breaks available to freelancers and small business owners.
The QBI deduction is available to sole proprietors, partners, and S-corporation shareholders. It applies to income earned through a qualified trade or business conducted within the United States. The deduction is taken on your personal return and reduces your taxable income, though it does not reduce your self-employment tax or your AGI.
There are income limits that affect certain types of businesses. For 2025, if your taxable income is below $191,950 (single) or $383,900 (married filing jointly), you can generally claim the full 20% deduction regardless of your business type. Above those thresholds, the deduction begins to phase out for specified service trades or businesses (SSTBs) — categories that include law, medicine, consulting, accounting, financial services, and performing arts. Above $241,950 single or $483,900 MFJ, SSTB owners lose the deduction entirely.
For a freelancer earning $80,000 in qualified business income below the threshold, the QBI deduction would be $16,000 (20% of $80,000). At a 22% marginal rate, this saves $3,520 in income tax — a substantial benefit on top of the SE tax deduction and business expense deductions.
Self-Employment vs. W-2: Total Tax Comparison
One of the most common questions freelancers ask is whether they pay more in taxes than W-2 employees. The short answer is that self-employed workers do pay more in payroll taxes, but the gap is smaller than it first appears thanks to several offsetting deductions.
A W-2 employee earning $80,000 pays 7.65% in FICA taxes ($6,120), and the employer pays a matching $6,120. The employee never sees the employer's share on their pay stub, but economists widely agree that the employer's portion effectively comes out of the employee's total compensation.
A self-employed person earning $80,000 in net SE income pays the full $11,304 in SE tax (after the 92.35% adjustment). However, they then deduct $5,652 from their AGI, which saves roughly $1,243 in income tax at the 22% bracket. They may also claim the QBI deduction of $16,000, saving another $3,520 in income tax. And they can deduct business expenses like home office costs, mileage, and equipment that W-2 employees generally cannot.
When you factor in the SE tax deduction, the QBI deduction, and legitimate business expense deductions, the total tax difference between a self-employed worker and a W-2 employee at the same income level is much narrower than the headline 15.3% rate suggests. In some cases, especially at moderate income levels with significant business expenses, the self-employed worker may actually pay less in total federal tax.
Frequently Asked Questions
Do I have to pay self-employment tax on all my income?
No. Self-employment tax applies only to your net self-employment earnings — gross income minus allowable business expenses. The Social Security portion (12.4%) is also capped at $176,100 in 2025. Income above that threshold is subject only to the 2.9% Medicare tax (plus the 0.9% surtax on high earners). Additionally, only income from a trade or business counts — investment income, rental income, and wages from a W-2 job are not subject to SE tax.
Can I deduct health insurance premiums as a self-employed worker?
Yes. If you are self-employed and not eligible for an employer-sponsored health plan through a spouse or other job, you can deduct 100% of your health insurance premiums as an above-the-line deduction. This includes coverage for yourself, your spouse, and your dependents. The deduction reduces your AGI and your income tax, though it does not reduce your net SE income for SE tax purposes.
What expenses reduce self-employment tax?
Any ordinary and necessary business expense that reduces your net self-employment income on Schedule C also reduces your SE tax. Common examples include home office expenses, vehicle mileage or actual car expenses, supplies, software subscriptions, professional development, advertising, and payments to subcontractors. The lower your net SE income, the lower your 15.3% SE tax bill.
Do I need to file a tax return if I made less than $400 from self-employment?
If your net self-employment income is under $400, you do not owe self-employment tax. However, you may still need to file a federal income tax return if your total income from all sources exceeds the standard filing threshold ($15,000 for single filers in 2025). You should also file if you had taxes withheld from other income or want to claim refundable credits like the Earned Income Tax Credit.
Can I reduce SE tax by forming an S-corp?
Yes, but only when it makes financial sense. With an S-corp election, you pay yourself a reasonable salary (subject to FICA) and take remaining profits as distributions that are not subject to SE tax. This can save thousands of dollars per year if your business earns well above a reasonable salary. However, S-corps require payroll processing, additional tax filings (Form 1120-S), and have associated costs. Most tax professionals recommend considering the S-corp strategy once net business income consistently exceeds $60,000 to $80,000 annually.