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
Step-by-Step
- 1Calculate net self-employment income (revenue minus business expenses)
- 2Multiply by 92.35% (only this portion is subject to SE tax per IRS rules)
- 3Apply 12.4% Social Security tax (up to $184,500 wage base) and 2.9% Medicare (no cap)
- 4Deduct half of SE tax from ordinary income (above-the-line deduction)
- 5Calculate income tax on remaining taxable income using standard brackets
- 6Add SE tax and income tax for total tax liability
Example
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?
How do quarterly estimated tax payments work?
Can I deduct half of my self-employment tax?
How does self-employment tax compare to W-2 FICA withholding?
What tax deductions are available for self-employed individuals?
Should I form an S-Corporation to save on self-employment tax?
What happens if I don't pay quarterly estimated taxes?
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Next Steps
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