Self-Employment Tax Explained: How the 15.3% Works (2026)
When you leave a salaried job for freelance work, your first tax season tends to deliver a shock: a bill for something called self-employment tax — 15.3% on top of your regular federal income tax. This guide walks through exactly what that number is, where it comes from, what you can deduct against it, and how to compute it step by step using real 2026 figures.
What self-employment tax actually is
Self-employment (SE) tax is the self-employed person's version of FICA — the Federal Insurance Contributions Act taxes that fund Social Security and Medicare. When you work as a W-2 employee, these taxes are split evenly between you and your employer: each side pays 7.65%, for a combined 15.3% on your wages. The employee half is visible on your pay stub; the employer half is paid silently and never shows up in your take-home pay at all.
As a freelancer, contractor, sole proprietor, or single-member LLC owner, you are simultaneously the employee and the employer. That means you owe both halves. According to the IRS (Schedule SE, Form 1040), self-employed individuals pay the full 15.3% combined rate — 12.4% for Social Security and 2.9% for Medicare — calculated on their net self-employment earnings.
It is important to understand that SE tax is separate from federal income tax. You will owe both. SE tax goes to fund Social Security and Medicare; federal income tax goes to general government revenues. The two are calculated differently and neither is a credit against the other, though certain deductions from SE tax do reduce your income tax base (more on that shortly).
The two components: Social Security and Medicare
The 15.3% rate is made up of two distinct parts, each with different rules about what income it applies to.
| Component | Rate | 2026 Wage Base |
|---|---|---|
| Social Security | 12.4% | First $184,500 of net SE earnings |
| Medicare | 2.9% | All net SE earnings (no cap) |
| Combined SE tax | 15.3% | Up to $184,500; then 2.9% above |
The Social Security wage base of $184,500 for 2026 is set by the Social Security Administration (SSA) each year based on the national average wage index. For 2025 it was $176,100; for 2026 the SSA raised it to $184,500 (SSA Contribution and Benefit Base announcement, October 2025). Earnings above $184,500 are exempt from the 12.4% Social Security portion but remain subject to the 2.9% Medicare tax with no ceiling.
High earners should also be aware of the Additional Medicare Tax: an extra 0.9% applies to net earnings above $200,000 for single filers and $250,000 for married filing jointly, under the Affordable Care Act. This calculator does not model that surtax, which affects a small fraction of self-employed taxpayers.
The 92.35% multiplier — why you do not pay on 100% of your net income
Here is a detail that trips up many first-time freelancers: you do not calculate SE tax on your full net self-employment income. You calculate it on 92.35% of that income.
The 92.35% factor comes from 1 − 0.0765 = 0.9235. It represents the fact that an employee's gross wage is already reduced by the employer's 7.65% FICA contribution before the employee sees it. This adjustment puts self-employed people on roughly equal footing with W-2 employees by removing the "employer half" from the SE tax base. The IRS codifies this in IRC §1402(a).
In plain terms: if your Schedule C net profit is $100,000, you calculate SE tax on $92,350, not $100,000. That saves you roughly $1,170 in SE tax compared with applying 15.3% to the full amount.
The 50% employer-portion deduction — lowering your income tax
After you calculate your SE tax, you get one more benefit: you can deduct half of the SE tax as an above-the-line deduction on your Form 1040 (Schedule 1, Line 15). This deduction mimics the tax treatment of W-2 employees, whose employers pay their matching FICA half as a pre-tax business expense.
This deduction does not reduce your SE tax itself — it reduces your federal income tax by lowering your adjusted gross income (AGI). Because it is "above the line," you can claim it even if you take the standard deduction.
This deduction is automatic — the IRS built it into Schedule SE so every self-employed person receives it without having to itemize or meet any additional eligibility test. It is one of the most straightforward and universally available tax breaks for the self-employed.
Fully worked example: a $85,000 freelancer in 2026
Here is a step-by-step calculation for a single filer with $85,000 of net Schedule C income in 2026. All figures use current IRS and SSA numbers.
| Step | Calculation | Amount |
|---|---|---|
| Net SE income (Schedule C profit) | Given | $85,000 |
| SE tax base (×92.35%) | $85,000 × 0.9235 | $78,498 |
| SE tax (15.3% — all below wage base) | $78,498 × 0.153 | $12,010 |
| ½ SE tax deduction (above-the-line) | $12,010 ÷ 2 | $6,005 |
| Income after ½ SE deduction | $85,000 − $6,005 | $78,995 |
| Standard deduction (single, 2026) | IRS Rev. Proc. 2025-32 | $15,750 |
| QBI deduction (20% of net SE income) | $85,000 × 0.20 | $17,000 |
| Taxable income | $78,995 − $15,750 − $17,000 | $46,245 |
| Federal income tax (2026 brackets) | 10%/12%/22% brackets applied | approx. $5,700 |
| Total federal tax (SE + income) | $12,010 + $5,700 | approx. $17,710 |
| Estimated quarterly payment | $17,710 ÷ 4 | approx. $4,428 |
A few notes on the example. The standard deduction for 2026 is $15,750 for single filers (IRS Rev. Proc. 2025-32, indexed for inflation). The QBI deduction of 20% applies because $85,000 is well below the 2026 §199A phase-out threshold of $201,750 for single filers. The federal income tax figure is approximate because the exact bracket math depends on the full 1040 picture; use the calculator linked below for a precise result.
What counts as net self-employment income
Self-employment tax is not calculated on your gross 1099 receipts — it is calculated on your net profit from Schedule C. That means you subtract ordinary and necessary business expenses before the SE tax calculation even begins. Every dollar you legitimately deduct from your Schedule C reduces both SE tax and federal income tax.
Common deductible business expenses for freelancers include:
- Home office (dedicated workspace, proportional rent or mortgage interest)
- Software subscriptions, online tools, and SaaS platforms used for work
- Business-use portion of phone and internet
- Professional development, books, and courses
- Equipment (computers, cameras, gear) — either expensed under Section 179 or depreciated
- Business travel, mileage (2026 standard mileage rate: 70 cents per mile per IRS Notice 2025-72), and meals at 50%
- Advertising, marketing, and website costs
- Professional fees (accountant, attorney)
- Self-employed health insurance premiums (deducted separately on Form 1040, not Schedule C)
Tracking and deducting every valid business expense is one of the highest-return financial habits you can build as a freelancer. A $5,000 reduction in Schedule C net profit saves you roughly $765 in SE tax alone (15.3% × 0.9235 × $5,000), plus whatever federal income tax applies to that income.
Quarterly estimated taxes: paying as you go
W-2 employees have taxes withheld from every paycheck. Freelancers have no withholding, so the IRS requires you to make quarterly estimated tax payments throughout the year using Form 1040-ES. Missing or underpaying these can trigger an underpayment penalty even if you pay the full amount when you file your annual return.
The four due dates for 2026 are:
- April 15, 2026 — Q1 (January–March income)
- June 16, 2026 — Q2 (April–May income)
- September 15, 2026 — Q3 (June–August income)
- January 15, 2027 — Q4 (September–December income)
You can avoid penalties entirely by meeting one of two IRS safe harbors: pay at least 90% of your current-year tax liability, or pay 100% of last year's tax liability (110% if your prior-year AGI exceeded $150,000). Most freelancers with reasonably stable income find it easiest to simply divide their estimated annual tax by four and pay that amount each quarter. Setting aside 25–30% of every invoice or client payment into a dedicated savings account is a practical way to make sure the money is there when due dates arrive.
How the S-Corp strategy reduces self-employment tax
Once your net self-employment income rises above roughly $50,000–$80,000 per year, it may be worth exploring whether electing S-Corp status could reduce your SE tax. The strategy works because S-Corp distributions — the profit paid to you as an owner beyond your salary — are not subject to self-employment tax.
As an example: if you earn $120,000 net and pay yourself a "reasonable salary" of $72,000 through a payroll system, only the $72,000 salary is subject to FICA-equivalent payroll taxes. The remaining $48,000 taken as a distribution avoids SE tax entirely. At the 15.3% effective rate on the SE base, that could be over $6,000 in annual savings — though you will have accounting, payroll, and filing costs that eat into that figure. The strategy only makes financial sense once the tax savings materially exceed those overhead costs.
This is a decision that benefits from advice from a CPA familiar with your specific situation. The IRS scrutinizes S-Corp owner compensation closely; paying yourself an unreasonably low salary to maximize distributions is a known audit trigger.
Run the numbers for your situation
Figro's self-employment tax calculator estimates your SE tax, federal income tax, QBI deduction, and quarterly payments for 2026 — entirely in your browser, with no signup and nothing uploaded.
Open the free self-employment tax calculator →Figro's guides are educational and independent. They are not financial, legal, or tax advice. Some pages include affiliate links; if you purchase through them we may earn a commission at no extra cost to you. Tax figures in this guide reflect 2026 IRS and SSA published parameters; consult a qualified tax professional for advice specific to your situation.