About the Self-Employment Tax Calculator
Self-employment tax is the 15.3% tax that replaces the employer-and-employee split of FICA for freelancers and independent contractors - and it's calculated separately from federal income tax. Our Self-Employment Tax Calculator estimates that amount from your net earnings.
How It Works
The calculator applies the IRS-required 92.35% adjustment to your net self-employment earnings (an allowance that approximates the employer half not being separately taxed), then applies the combined 15.3% self-employment tax rate (12.4% Social Security + 2.9% Medicare) to that adjusted amount. It also shows the deductible half you can subtract from income for income tax purposes.
Formula & Methodology
This is the identical calculation covered under the 1099 Tax Calculator's self-employment tax component, offered here as a standalone tool for anyone who just needs the SE tax figure without the full combined income tax estimate. The 92.35% adjustment approximates the employer-side FICA share a W-2 employer would otherwise pay separately and never include in taxable wages; the 15.3% combines 12.4% Social Security (capped at the annual wage base) and 2.9% Medicare (uncapped).
Step-by-Step: Calculating It By Hand
- 1Start with net self-employment earnings (revenue minus deductible business expenses).
- 2Multiply by 92.35% to find the SE-taxable base.
- 3Multiply that base by 15.3% to find total self-employment tax.
- 4Divide by 2 to find the portion deductible against income tax.
Examples
Typical freelance income
$60,000 in net self-employment earnings produces roughly $8,478 in self-employment tax, with $4,239 deductible against income tax.
Why it surprises new freelancers
A W-2 employee earning the same $60,000 only sees half this amount (7.65%) withheld directly, with the employer covering the other half - self-employed workers pay both halves themselves.
Advantages
- Applies the exact IRS formula, including the 92.35% adjustment many simple calculators skip
- Shows the deductible half separately, which reduces your income tax calculation
- Fast way to estimate a tax often overlooked by new freelancers
- Useful for setting aside the right amount from each payment received
Common Mistakes
- Forgetting self-employment tax exists entirely and budgeting only for income tax
- Not setting aside money throughout the year, leading to a large bill at filing time
- Confusing gross revenue with net earnings - this tax applies to profit after business expenses
- Missing the deductible half of SE tax when estimating income tax owed separately
Edge Cases to Watch For
- Net earnings under $400 in a year are exempt from self-employment tax entirely.
- Once combined W-2 and self-employment earnings exceed the Social Security wage base, only the 2.9% Medicare portion applies to further self-employment income that year.
- High earners may owe an additional 0.9% Medicare surtax above certain income thresholds, which this base calculation doesn't include.
- This tax applies to net profit, not gross revenue - accurately tracking deductible business expenses directly lowers the SE tax bill.
Common Use Cases
- Estimating self-employment tax owed on freelance or contract income
- Setting aside the right amount from each freelance payment for taxes
- Understanding the full tax burden of self-employment versus W-2 work
- Planning quarterly estimated tax payments