Self-Employment Tax Explained: What It Is and How It Works
J
Jason AstwoodFounder & Lead Tax Strategist
March 17, 2026
8 min read
If you work for yourself, understanding self-employment tax is a big part of staying on top of your finances. Many freelancers, contractors, and small business owners are surprised to learn that self-employment tax is separate from regular federal income tax and can significantly affect what they owe. The IRS explains that self-employment tax generally covers Social Security and Medicare taxes for people who work for themselves.
In this guide, we’ll break down self-employment tax explained in simple terms, including who pays it, how it is calculated, when it applies, and what you can do to plan ahead.
What is self-employment tax?
Self-employment tax is the tax self-employed individuals generally pay for Social Security and Medicare. If you are an employee, those taxes are usually split between you and your employer through paycheck withholding. If you are self-employed, you generally pay both portions yourself through self-employment tax. The IRS says you typically use Schedule SE (Form 1040) to calculate it.
This commonly applies to people such as:
freelancers
independent contractors
gig workers
sole proprietors
some LLC owners
some partners in partnerships
For many business owners, this is one of the biggest reasons their tax bill feels higher than expected.
Who has to pay self-employment tax?
In general, the IRS says you must pay self-employment tax if your net earnings from self-employment are $400 or more. The IRS also notes that if you are self-employed as a sole proprietor or independent contractor, you generally use Schedule C to determine your business profit or loss, and then Schedule SE to figure the self-employment tax due.
That means even a side hustle can create a filing requirement if your net earnings reach that threshold.
Examples of people who may owe self-employment tax include:
a graphic designer doing freelance client work
a rideshare or delivery driver
a photographer with independent bookings
a consultant paid on 1099s
an online seller operating as a sole proprietor
What does self-employment tax pay for?
Self-employment tax generally funds:
Social Security
Medicare
The IRS explains that Schedule SE information is also used by the Social Security Administration when figuring benefits under the Social Security program.
That means this tax is not just a cost. It also ties into future benefits, including retirement and Medicare coverage eligibility.
How self-employment tax is different from income tax
One of the most common points of confusion is that self-employment tax is not the same as federal income tax.
You may owe:
income tax on your taxable income
self-employment tax on your net earnings from self-employment
So if you are self-employed, you may be paying both. That is why freelancers and business owners often need to set aside more than they expect throughout the year. The IRS estimated tax guidance specifically notes that estimated tax is used to pay tax on income that is not subject to withholding, including self-employment earnings.
How is self-employment tax calculated?
At a basic level, self-employment tax is based on your net earnings from self-employment, which usually means your business income minus allowable business expenses. The IRS says self-employed individuals generally use Schedule C to report profit or loss and Schedule SE to compute self-employment tax.
For 2026, IRS materials show the Social Security wage base is $184,500, while Medicare tax does not have the same wage-base cap.
You do not need to memorize the form mechanics, but the general process looks like this:
Add up your self-employment income.
Subtract eligible business expenses.
Determine your net earnings.
Use Schedule SE to calculate the self-employment tax.
Report the result with your Form 1040 filing.
Can you deduct any of it?
Yes. The IRS says that when figuring adjusted gross income, you can generally deduct one-half of your self-employment tax on your Form 1040. That does not eliminate the tax, but it can reduce your taxable income.
This is one reason it helps to work with a tax professional if your business income is growing. A preparer can help make sure you are not missing deductions and can help you estimate what to set aside.
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Do you have to make quarterly tax payments?
In many cases, yes. Because self-employment income usually does not have taxes withheld automatically, the IRS generally expects eligible taxpayers to make estimated tax payments during the year. The IRS estimated tax guidance says individuals, including sole proprietors, partners, and S corporation shareholders, generally use Form 1040-ES to calculate estimated tax.
The IRS lists the standard estimated tax due dates as:
April 15 for income earned January 1 through March 31
June 15 for income earned April 1 through May 31
September 15 for income earned June 1 through August 31
January 15 of the following year for income earned September 1 through December 31
Missing these payments can lead to underpayment penalties, even if you pay the full balance later when you file.
Common mistakes self-employed taxpayers make
When people search for self-employment tax explained, they are often really trying to avoid expensive mistakes. Here are some of the most common ones:
1. Not setting aside enough money
Because there is no employer withholding taxes for you, it is easy to underestimate what you owe.
2. Forgetting quarterly payments
A lot of self-employed workers wait until tax season and then discover they should have been paying during the year. The IRS estimated tax rules are a major reason this happens.
3. Mixing personal and business expenses
Poor records can make it harder to claim valid deductions and easier to make mistakes.
4. Assuming side income does not count
The IRS threshold for self-employment tax can be lower than many people expect. Net earnings of $400 or more can trigger self-employment tax.
5. Not getting help early
Many people only ask questions when filing deadlines are close. In most cases, the better time to plan is throughout the year.
How to prepare for self-employment taxes
A good system can make tax season much less stressful.
Here are some practical steps:
keep separate business and personal accounts
track income monthly
save receipts and expense records
use bookkeeping software or organized spreadsheets
estimate taxes regularly
review your numbers before each quarterly due date
talk to a tax professional if your income changes significantly
These habits can help you avoid surprises and improve your cash flow planning.
When to get help from a tax professional
You may be able to handle basic self-employment taxes on your own, but professional help becomes more valuable when:
your income is increasing
you have multiple revenue streams
you are unsure which expenses are deductible
you formed an LLC or changed entity type
you missed quarterly payments
you received an IRS notice
you want proactive tax planning, not just tax filing
A tax professional can help you understand how self-employment tax fits into your bigger tax picture and help you avoid preventable errors.
Final thoughts
If you have been searching for self-employment tax explained, the most important takeaway is this: self-employment tax is generally the Social Security and Medicare tax that self-employed individuals pay on their net earnings. If your net self-employment earnings are $400 or more, you may need to pay it, and you may also need to make estimated payments during the year.
The sooner you understand how it works, the easier it becomes to budget for taxes, avoid penalties, and make smarter business decisions.
If you need help calculating self-employment tax, planning quarterly payments, or preparing your return, working with a qualified tax professional can make the process much easier.
Self-employment tax is generally the Social Security and Medicare tax paid by people who work for themselves rather than having those taxes withheld through an employer paycheck.
Who has to pay self-employment tax?
In general, the IRS says you must pay self-employment tax if your net earnings from self-employment are $400 or more.
Is self-employment tax the same as income tax?
No. Self-employment tax is separate from federal income tax. Many self-employed people may owe both, depending on their income and deductions.
Do freelancers pay self-employment tax?
Yes, in many cases. Freelancers, contractors, gig workers, and sole proprietors often owe self-employment tax if they meet the IRS threshold.
Can I deduct self-employment tax?
You can generally deduct one-half of your self-employment tax when figuring adjusted gross income on your Form 1040.
Disclaimer: This content is for informational purposes only and does not constitute legal or financial advice. Tax laws change frequently, so consult a qualified tax professional for advice specific to your situation.
