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Free Self-Employment Tax Calculator — 1099 & SE Tax

Free self-employment tax calculator for 2026. Calculate SE tax (15.3% on 92.35% of net income), half deduction, quarterly estimates, 1099 & federal + state tax. No sign-up.

Last reviewed: January 2026 · Tax data verified against IRS Publication 15-T & state revenue departments

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How This Calculator Works

15.3%. That's the self-employment tax rate, and if you just went freelance, it's probably higher than you expected. It covers both halves of Social Security (12.4%) and Medicare (2.9%) — the half your employer used to pay plus the half that always came out of your paycheck. Nobody warned me about this when I started consulting. It's a punch in the wallet.

Here's a small relief: you don't pay 15.3% on 100% of your income. It's calculated on 92.35% of your net business income, which roughly accounts for the employer-half deduction that W-2 workers get automatically. So on $100,000 of net SE income, the tax base is $92,350 and the SE tax comes to roughly $14,130. Still hurts, but less than you might have feared at first glance. And you can deduct half of your SE tax ($7,065 in this example) as an above-the-line deduction. It doesn't reduce the SE tax itself, but it lowers your AGI, which means less federal and state income tax. Every bit counts.

Quick reference for what you're dealing with:
- Social Security portion: 12.4% on income up to $184,500
- Medicare portion: 2.9% on everything, no cap
- Additional Medicare: 0.9% on income above $200,000
- Half of SE tax is deductible above the line

Quarterly estimated payments. This is where new freelancers get into trouble. You have to send the IRS money four times a year — April 15, June 15, September 15, January 15 — or face penalties. The safe harbor is paying at least 100% of last year's tax liability (110% if your AGI was over $150,000) or 90% of this year's. We estimate those quarterly amounts so there are no ugly surprises in April. Seriously, don't skip estimated payments. The penalties aren't worth it.

Want to see how self-employment income compares to a W-2 salary? Check our salary after tax pages to compare take-home pay at every income level across 23 states.

How It's Calculated

Formula

SE Tax = Net Earnings × 92.35% × 15.3%, with deduction = SE Tax ÷ 2

Step-by-Step

  1. 1Calculate net self-employment income (revenue minus business expenses)
  2. 2Multiply by 92.35% (only this portion is subject to SE tax per IRS rules)
  3. 3Apply 12.4% Social Security tax (up to $184,500 wage base) and 2.9% Medicare (no cap)
  4. 4Deduct half of SE tax from ordinary income (above-the-line deduction)
  5. 5Calculate income tax on remaining taxable income using standard brackets
  6. 6Add SE tax and income tax for total tax liability

Example

$80,000 net SE income: SE taxable = $73,880. SE tax = $11,304 ($9,161 SS + $2,143 Medicare). Deduct $5,652 from income. Income tax on ~$57,248 ≈ $6,850. Total ≈ $18,154.

For detailed data sources and full methodology, see our Methodology & Data Sources page.

Key Rates & Data for 2026

SE Tax Rate

15.3% on 92.35% of net income

Social Security Portion

12.4% (up to $184,500)

Medicare Portion

2.9% (no cap)

Additional Medicare

0.9% (above $200K)

Half SE Tax Deduction

Above-the-line

Self-Employment Tax FAQ

What is the self-employment tax rate for 2026?

15.3% on 92.35% of your net business income. That's 12.4% for Social Security (capped at $184,500 in income) and 2.9% for Medicare (no cap). Once you cross $200K in net SE income, tack on another 0.9% Medicare surcharge on everything above that. Basically, you're covering both the employee and employer sides of FICA since you are both.

How do quarterly estimated tax payments work?

If you're self-employed, the IRS wants its money throughout the year, not just at tax time. You make four payments — April 15, June 15, September 15, and January 15 — each covering roughly a quarter of what you expect to owe (income tax plus SE tax). To dodge underpayment penalties, you generally need to pay at least 100% of last year's tax bill (110% if your AGI was over $150K) or 90% of this year's. You can pay online through IRS Direct Pay or EFTPS.

Can I deduct half of my self-employment tax?

Yes! It's an above-the-line deduction, meaning you get it whether you itemize or not. If your SE tax is, say, $14,130, you deduct $7,065 from your income before calculating income tax. It lowers your AGI, which can help with state taxes too and maybe keep you under certain income thresholds. Just know it doesn't reduce the SE tax itself — that still needs to be paid in full.

How does self-employment tax compare to W-2 FICA withholding?

W-2 employees pay 7.65% and their employer matches another 7.65%. When you're self-employed, you're both — so you pay the full 15.3%. The 92.35% adjustment and the half-of-SE-tax deduction help soften the blow somewhat, but on $100K of income, you're still paying roughly $7,000 more in payroll taxes than a W-2 worker making the same amount. It's the cost of being your own boss.

What tax deductions are available for self-employed individuals?

There's actually a lot to work with. Half your SE tax is deductible above the line. You can stash up to $72,000 in a Solo 401(k) for 2026 (including the employer portion). Health insurance premiums? Deductible above the line. Home office — $5 per square foot up to 300 sq ft using the simplified method, or actual expenses if you want to go that route. Business expenses like software, travel, meals (50%), supplies, and professional services all count. And don't forget the Qualified Business Income deduction, which can shave up to 20% off your qualified business income. That one's easy to miss.

Should I form an S-Corporation to save on self-employment tax?

Maybe. The play is to split your income between a reasonable salary (subject to FICA/SE tax) and distributions (not subject to SE tax). On $150K of net income, you might take a $75K salary and $75K in distributions, saving SE tax on that second half. But — and it's a big but — S-Corps come with extra paperwork, payroll requirements, state fees, and more complex tax returns. The math usually makes sense once you're consistently clearing $60K–$80K in net income. Below that, the hassle probably isn't worth it. Talk to a CPA about your specific situation.

What happens if I don't pay quarterly estimated taxes?

You'll probably get hit with an underpayment penalty when you file your return — even if you pay everything by April 15. The penalty is basically interest on what you should've paid each quarter, usually running 3–8% annually depending on the IRS rate that quarter. Easiest way to avoid it: hit the safe harbor by paying 100% of last year's tax (110% if your AGI was over $150K) or 90% of this year's through withholding and estimated payments.

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