Self-Employment Tax Explained: What Every Freelancer Needs to Know

What is self-employment tax?

Self-employment tax (SE tax) is the way the IRS collects Social Security and Medicare contributions from people who work for themselves. When you're a traditional employee, your employer splits these costs with you — they pay half and you pay half through payroll deductions. When you're self-employed, there's no employer. So you pay both halves yourself.

That's why the SE tax rate feels so high: it's actually two taxes combined into one.

Component	Rate	Income limit (2025)
Social Security	12.4%	First $176,100
Medicare	2.9%	No limit
Total SE tax rate	15.3%	—
Additional Medicare surtax	0.9%	Income above $200,000

Who has to pay SE tax?

You owe self-employment tax if you meet any of the following:

• You had net self-employment income of $400 or more in a year
• You received a 1099-NEC or 1099-K for work you performed
• You earned income as a freelancer, contractor, gig worker, or sole proprietor
• You run a single-member LLC that hasn't elected S-Corp status
• You drive for Uber, deliver for DoorDash, sell on Etsy, or do any other platform-based gig work

How SE tax is calculated (step by step)

The IRS doesn't apply the 15.3% rate to your full gross income. There are two adjustments that work in your favor before the rate is applied.

Step 1 — Calculate your net SE income

Start with your gross self-employment revenue and subtract your legitimate business expenses. Only the net amount is subject to SE tax.

Net SE income = Gross revenue − Business expenses

Step 2 — Multiply by 92.35%

The IRS lets you deduct the "employer-equivalent" portion of SE tax before calculating your tax base. In practice, this means you only pay SE tax on 92.35% of your net income, not 100%.

SE tax base = Net SE income × 0.9235

Step 3 — Apply the 15.3% rate

SE tax = SE tax base × 15.3%

A real-world example

Let's say you're a freelance graphic designer who earned $70,000 in client revenue this year, with $8,000 in business expenses (software, home office, equipment).

That's $8,760 just in SE tax — before federal income tax is even factored in. This is why freelancers are often advised to set aside 25–30% of every payment they receive throughout the year.

SE tax vs. W-2 employees

One of the most common questions I hear from new freelancers is: "Why do I owe so much more than I did when I had a regular job?" Here's why.

	W-2 Employee	Self-Employed
Social Security (12.4%)	Employer pays half (6.2%)	You pay full 12.4%
Medicare (2.9%)	Employer pays half (1.45%)	You pay full 2.9%
Taxes withheld automatically	Yes	No — you pay quarterly
Employer "hidden" contribution	7.65% extra paid by employer	You absorb this cost

When you work for yourself, you effectively lose the employer's 7.65% contribution to FICA taxes. This is the real cost of being your own boss — and it's why understanding SE tax early matters so much.

The half SE tax deduction — your built-in relief

Here's some good news: the IRS gives you a partial break. You can deduct 50% of your SE tax as an above-the-line deduction on Schedule 1 of your Form 1040. This reduces your Adjusted Gross Income (AGI), which in turn lowers your federal income tax.

Using our example above:

• SE tax owed: $8,760
• 50% deduction: $4,380
• This $4,380 is subtracted from your AGI before calculating income tax

Quarterly estimated payments

Unlike W-2 employees who have taxes withheld from every paycheck, self-employed individuals must pay taxes proactively throughout the year. The IRS calls these quarterly estimated tax payments.

If you expect to owe $1,000 or more in federal taxes for the year, you're required to make four payments per year. The 2025 due dates are:

Quarter	Income period	Due date
Q1	Jan 1 – Mar 31	April 15, 2025
Q2	Apr 1 – May 31	June 16, 2025
Q3	Jun 1 – Aug 31	September 15, 2025
Q4	Sep 1 – Dec 31	January 15, 2026

You can pay quarterly estimates online at IRS Direct Pay (irs.gov/payments) — no account required, just a bank account and a few minutes.

How to legally reduce your SE tax

SE tax is calculated on your net self-employment income. So the most direct way to reduce it is to reduce your net income through legitimate deductions. Here are the most impactful ones.

1. Maximize business expense deductions

Every dollar of legitimate business expense reduces your net SE income dollar-for-dollar. Common deductions include home office, vehicle mileage (70 cents/mile in 2025), software, professional development, health insurance premiums, and equipment.

2. Contribute to a retirement account

A SEP-IRA allows you to contribute up to 25% of your net SE income (maximum $70,000 in 2025). A Solo 401(k) allows even higher contributions. Both reduce your AGI significantly — though note they reduce income tax more than SE tax directly.

3. Deduct your health insurance premiums

If you're self-employed and not eligible for coverage through a spouse's employer plan, you can deduct 100% of your health insurance premiums — for yourself, your spouse, and your dependents. This is an above-the-line deduction that reduces your AGI.

4. Consider forming an S-Corporation

Once your net SE income consistently exceeds about $60,000–$80,000 per year, it may be worth speaking with a CPA about electing S-Corp status. An S-Corp allows you to split your income into a salary (subject to SE tax) and distributions (not subject to SE tax). The tax savings can be substantial — but there are added costs and administrative requirements.

Bottom line

Self-employment tax is one of the most significant costs of working for yourself — and it surprises people every single year. The freelancers who handle it best are the ones who:

1. Know the rate (15.3% on 92.35% of net income)
2. Set money aside from every payment they receive (25–30%)
3. Pay quarterly to avoid penalties
4. Track every business expense to reduce their net income
5. Work with a bookkeeper to stay organized year-round

The good news: once you understand how it works, SE tax is completely manageable. Use the free calculator below to see exactly what you owe based on your actual income and state.