Self-Employment Tax: What Freelancers Actually Owe

When you go freelance, nobody sits you down and explains the 15.3%. No onboarding packet, no HR orientation. You just get your first big payment, feel great about it, and then realize six months later that a chunk of it was already spoken for.

Self-employment tax is the single biggest surprise for new freelancers. Here’s exactly what it is, how it works, and what you can do about it.

What Self-Employment Tax Actually Is

When you’re an employee, your paycheck stub shows two lines you probably ignored: Social Security and Medicare. Your employer withholds those amounts from your pay — and then matches them, paying an equal amount on your behalf.

You never see your employer’s half. It comes out before your paycheck is generated.

As a freelancer, you’re both employee and employer. You owe both halves.

That’s where 15.3% comes from:

• Social Security: 12.4% (on income up to $176,100 in 2025)
• Medicare: 2.9% (on all income, no cap)

These rates combine to 15.3%. They’re assessed on your net self-employment income — revenue minus business expenses — and they hit before your federal income tax does.

The Additional Medicare Tax

If you’re earning well — above $200,000 single or $250,000 married filing jointly — you owe an additional 0.9% Medicare surcharge. Most freelancers in the $50k–$150k range don’t hit this, but it’s worth knowing if you’re having a great year.

The Calculation You Need to Know

The IRS doesn’t hit you for 15.3% on your full gross income. They apply it to 92.35% of your net self-employment income. This quirk exists because employees have always had SE tax calculated on after-employer-contribution income — the IRS is trying to make the math equivalent.

Example: You netted $80,000 after business expenses.

• SE tax base: $80,000 × 0.9235 = $73,880
• SE tax: $73,880 × 0.153 = $11,304

That’s $11,304 going to Social Security and Medicare before you touch federal income tax. On $80,000 net income. That’s real money.

The Deduction That Softens the Blow

Here’s the one thing that consistently surprises freelancers when they learn it: you can deduct half of your self-employment tax from your gross income.

This deduction doesn’t reduce your SE tax itself — that’s already calculated. But it reduces your adjusted gross income, which reduces your federal income tax.

Using the example above:

• SE tax: $11,304
• Half of SE tax: $5,652
• Adjusted gross income: $80,000 − $5,652 = $74,348

If you’re in the 22% federal bracket, that $5,652 deduction saves you about $1,243 in federal income taxes. Not life-changing, but real.

You don’t have to do anything special to claim this deduction. It’s calculated automatically on Schedule SE and flows to your Form 1040. Your tax software handles it.

How This Compares to W-2 Employment

Here’s the honest comparison. Say you and a salaried employee both earn $100,000.

As a W-2 employee:

• You pay: 7.65% FICA (half of 15.3%) = $7,650
• Your employer pays: another $7,650 on your behalf
• But: you never see or control that employer share

As a freelancer:

• You pay: 15.3% (after the 92.35% adjustment) ≈ $14,130
• Deduction saves you: ~$1,556 in federal taxes
• Net extra cost vs. employee: roughly $4,900–$5,500

This is the “self-employed premium” you pay for freedom. A salaried employee at $100k is slightly more expensive for their employer than you might think — that employer share is built into compensation discussions. But at the end of the day, you’re writing a bigger check to the IRS than an employee earning the same gross amount.

The breakeven gets better if you also have strong business deductions, an S-corp structure at higher income levels, or retirement contributions that reduce your taxable base.

When SE Tax Hits the Social Security Cap

Social Security is only assessed on income up to $176,100 (2025). If you earn more than that, you stop paying the 12.4% Social Security piece on dollars above the threshold — though the 2.9% Medicare portion keeps going.

At $200,000 net income, your effective SE tax rate drops somewhat because nearly $24,000 in income sits above the cap. This is one of several reasons high-income freelancers look at S-corp elections — but that’s a different conversation.

How to Account for SE Tax in Your Quarterly Payments

If you’re not setting aside enough for quarterly taxes, SE tax is why. Most freelancers should be reserving 25–30% of every payment they receive, specifically because SE tax layers on top of income tax.

For a freelancer in the 22% federal bracket with no state income tax:

• SE tax: ~14.1% effective (after the 92.35% adjustment)
• Federal income tax: ~15–18% after deductions
• Less the SE tax deduction savings: ~−2%

Total effective rate: roughly 27–30%. That 25–30% savings rule holds.

Practical Next Step

Open a dedicated savings account if you haven’t already. Name it “Tax Reserve.” Every time a client payment lands, immediately transfer 28% into that account. Don’t think about it, don’t negotiate with yourself — just automate the transfer.

By doing this, you never scramble at quarterly due dates. The money is already there, earning a little interest, waiting for April 15, June 15, September 15, and January 15.

SE tax isn’t avoidable as a freelancer (unless you restructure, which requires crossing a higher income threshold first). But it is predictable — and predictable means manageable.