Self-employment tax explained simply: it's the 15.3% tax that covers Social Security and Medicare for freelancers, independent contractors, gig workers, and anyone else who works for themselves. For a W-2 employee, the employer pays half and withholds the other half from your paycheck. When you work for yourself, you cover both halves. Once your net earnings from self-employment hit $400, you owe it. That number can catch first-year freelancers completely off guard. Here's how it works, how to calculate it, and the deduction that puts some of it back. For the quarterly payment side of things, see the guide to quarterly estimated taxes.
Self-Employment Tax Explained: The 15.3% Rule
First, a key distinction: SE tax is not income tax. Those are two separate calculations that both appear on your tax return. SE tax is specifically the combined Social Security and Medicare tax that funds retirement benefits, disability insurance, and hospital insurance for self-employed people. Calculated on Schedule SE, it flows to Schedule 2, which feeds your Form 1040.
The 15.3% rate breaks into two parts, per the IRS:
- 12.4% for Social Security (old-age, survivors, and disability insurance). This is the Social Security tax portion.
- 2.9% for Medicare taxes (hospital insurance)
If you've ever looked at a pay stub and seen FICA deductions, you'd recognize 6.2% for Social Security and 1.45% for Medicare. Those are the employee's half. Your employer matched that exact amount and sent it to the IRS alongside yours. When you work for yourself, there's no employer, so you send the full 15.3%. You pay both the employee and employer shares.
One important distinction: self-employment tax and federal income tax are separate obligations. Both apply to your net earnings throughout the year, but you calculate them independently by different rules. Your total federal tax bill is the sum of the two, plus any applicable state income tax.
Who Has to Pay Self-Employment Tax?
You owe self-employment tax if your net earnings from self-employment hit $400 or more in the calendar year, according to the IRS. That applies to:
- Freelancers and independent contractors filing Schedule C
- Sole proprietors and single-member LLC owners
- Partners (as individuals) receiving a distributive share of business income from a partnership
- Gig workers earning through rideshare, delivery, or freelance platforms. All of these individuals are required to file Schedule SE if their net earnings reach the threshold.
- Anyone receiving 1099-NEC income from clients
The $400 threshold is net income, not gross. If you earned $2,000 freelancing and had $1,700 in legitimate business expenses, your earnings from self-employment are $300, below the threshold. When earnings from self-employment stay that low, you may not owe any SE tax for the year. Most people who freelance regularly are well above it.
Having a W-2 job doesn't shield you from SE tax on side income. If your employer withholds FICA on your wages, that covers your payroll taxes on the job. Your side hustle income is separate. You owe SE tax on that net profit regardless of what happens at work.
Thinking about making the full jump to self-employment? The 5 things to consider before self-employment is worth reading first.
How to Calculate Self-Employment Tax in 2026
The IRS doesn't charge 15.3% on every gross dollar you earn. It charges 15.3% on 92.35% of your net earnings from self-employment. The 92.35% factor exists because the IRS lets you deduct the employer-equivalent portion before calculating the tax (mirroring how FICA works for employees). That calculation is handled automatically by Schedule SE, but understanding the math helps you plan.
The three-step formula for calculating your self-employment taxes:
- Calculate net self-employment income (business revenue minus deductible expenses)
- Multiply by 0.9235 to get net earnings subject to SE tax
- Multiply that by 15.3% to get your SE tax
A concrete example for self-employed individuals: you net $75,000 from freelancing after expenses.
- $75,000 × 0.9235 = $69,262.50
- $69,262.50 × 15.3% = $10,597.16 in SE tax
Your income tax is calculated separately on your AGI after the SE tax deduction (covered below).
The 2026 Social Security Wage Base: $184,500
The 12.4% Social Security portion only applies up to a ceiling. For 2026, that ceiling is $184,500 in combined wages and net earnings from self-employment, according to the IRS. Once you cross that threshold, you stop owing the Social Security piece. The 2.9% Medicare tax applies to every dollar of net earnings above that line. There is no cap on Medicare.
High-earning self-employed individuals face an additional 0.9% Medicare surtax on top of the regular Medicare taxes on income above $200,000 for single filers or $250,000 for married filers filing jointly, per the IRS. This stacks on top of the regular 2.9%. Most freelancers and side-hustlers won't hit these thresholds, but they're worth knowing about as income grows.
Each year, the Social Security wage base increases by a set amount. Employers face the same $184,500 ceiling for their employees. For reference, it was $176,100 in 2025. The current-year base is published by the SSA and appears in IRS Publication 15 each January.
The Self-Employment Tax Deduction
You pay 15.3%, but the IRS gives you back half of it as a deduction. Specifically, you can deduct one-half of your SE tax from your adjusted gross income (AGI) when you file. It's called the employer-equivalent deduction. It mirrors the break an employee gets. That employee never sees the employer's 7.65% contribution, because it comes out of the employer's pocket, not the employee's paycheck.
Using the example from above: $10,597 in SE tax divided by 2 equals $5,299. That amount reduces your AGI. If you're in the 22% federal income tax bracket, that deduction saves you roughly $1,166 in income tax.
Above-the-line means it applies whether you take the standard deduction or itemize. You don't have to do anything special to claim it. Schedule SE calculates the amount, and it flows automatically to Schedule 1, then to Form 1040. Tax software handles the flow. Knowing it exists helps you understand why your real effective tax rate is lower than the 15.3% headline on SE tax alone.
How Self-Employment Tax Compares to Employee FICA
The 15.3% rate can feel like a penalty for being your own boss. The honest comparison is more interesting than that. When you were an employee, your total FICA contribution was still 15.3%. You just only saw half of it.
| Worker type | Visible deduction | Hidden employer share | Total to IRS |
|---|---|---|---|
| W-2 employee | 7.65% | 7.65% (employer pays) | 15.3% |
| Self-employed | 15.3% | n/a | 15.3% |
The money going to Social Security and Medicare is the same. What's different is who cuts the check and when. An employee's taxes are withheld automatically and sent before they ever touch the money. A freelancer receives gross income on earnings from self-employment and has to manage the tax portion manually.
That gap in timing is where first-year self-employment gets people in trouble. You invoice $10,000, it lands in your checking account, and it feels like $10,000 is yours. It isn't. A chunk of it belongs to the IRS. The practical fix: open a dedicated savings account the moment you go self-employed, and transfer 25% to 30% of every payment you receive into it. That covers SE tax plus federal income tax for most people in the 22% bracket. If your income is higher or your state has income tax, transfer closer to 35%. What's left after you file is yours.
How to Reduce Your Self-Employment Tax
The SE tax rate is fixed. Your net self-employment income is not. Every dollar of legitimate business expense that reduces your net income also reduces your SE tax. The math works in both directions: expenses cut income tax and SE tax at the same time, which makes deductions more valuable for self-employed individuals than for W-2 employees.
Common deductible business expenses for self-employed people:
- Home office (must be used regularly and exclusively for business, per IRS Publication 587)
- Business equipment, software, and tools
- Professional development and training directly related to your work
- Business portions of phone and internet costs
- Business vehicle mileage (check irs.gov for the current-year IRS standard mileage rate before filing)
- Business insurance
- Fees paid to subcontractors
Health insurance is a significant one. Self-employed individuals can deduct 100% of health insurance premiums for themselves, their spouse, and dependents as an above-the-line deduction on Schedule 1. This doesn't reduce SE tax, but it does lower your AGI and your income tax.
The single most powerful tool for high earners is a retirement account. A SEP IRA lets you contribute up to 25% of net self-employment income (up to the IRS annual limit). A Solo 401(k) has even higher potential contribution limits. Both contributions work together to reduce your taxable income for income tax purposes. The SEP IRA vs Solo 401(k) comparison breaks down which one makes sense for your situation.
One strategy some high earners consider: electing S corporation status, which lets shareholders take distributions that aren't subject to SE tax (only wages are). It can work, but the cost of maintaining an S corp (payroll, separate filings, and state requirements) needs to exceed the tax savings. That decision is a question for a CPA, not a DIY calculation.
How to Pay Self-Employment Tax
Self-employment tax doesn't get paid on a separate form or through a separate system. It's combined with your income tax payment and goes through the same channels: quarterly estimated payments and your annual return.
The IRS typically expects you to pay quarterly on your earnings from self-employment, not in a lump sum in April. Miss the required quarterly payments and you may face an underpayment penalty when you file. The 2026 quarterly estimated tax due dates, per Form 1040-ES, are:
| Quarter | Income period | Due date |
|---|---|---|
| Q1 | Jan 1 to Mar 31 | April 15, 2026 |
| Q2 | Apr 1 to May 31 | June 16, 2026 |
| Q3 | Jun 1 to Aug 31 | September 15, 2026 |
| Q4 | Sep 1 to Dec 31 | January 15, 2027 |
The IRS's safe harbor rule says you avoid underpayment penalties if you pay at least 100% of last year's total tax liability or 90% of this year's actual liability, whichever is smaller. If your prior-year adjusted gross income exceeded $150,000, the threshold is 110% of last year's liability. Spreading that total across four equal payments keeps you safe.
You can pay online at IRS Direct Pay (irs.gov/directpay) at no cost using a bank account. The quarterly estimated tax guide walks through the step-by-step payment process and the safe-harbor calculation in detail.
The Bottom Line on Self-Employment Tax
Self-employment tax explained in full: it's the price of working for yourself, and it's a price worth paying when you understand it. The 15.3% rate and the 92.35% calculation sound complicated until you run the numbers once. After that, it's just arithmetic you plan around.
The moves that matter: keep your business expenses documented so your net income is accurate, set aside 25% to 30% of every payment into a dedicated tax account, and make your four quarterly payments on time. The deduction for half your SE tax is automatic (Schedule SE handles it), and knowing it exists helps you understand why your total tax burden is lower than the headline rate suggests.
If you're self-employed and want to cut your tax bill further, a retirement account is the most powerful tool available. The SEP IRA vs Solo 401(k) guide covers the contribution limits and which option fits a freelancer's situation. And if you're still getting started with self-employment, the Complete Beginner Guide to Freelancing covers the full picture. Taxes are just one piece of building a business that pays you well.