Self-Employment Tax Calculator
Estimate Self-Employment Tax totals, payments, rates, and costs for financial planning.
This self-employment tax calculator estimates the Social Security and Medicare tax owed on freelance, contractor, or 1099 net income - taxes that are normally split between employer and employee, but which self-employed workers must pay in full themselves.
Enter your net self-employment income, and the calculator estimates your self-employment tax liability.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| $80,000 net self-employment earnings | ≈$11,304 SE tax | Taxable base = $80,000 × 0.9235 = $73,880. SE tax = $73,880 × 0.153 ≈ $11,304. |
| $40,000 net self-employment earnings | ≈$5,652 SE tax | Taxable base = $40,000 × 0.9235 = $36,940. SE tax = $36,940 × 0.153 ≈ $5,652. |
Why Self-Employment Tax Is Higher Than an Employee's
A traditional employee and employer each pay half of Social Security and Medicare tax (roughly 7.65% each, for a combined 15.3%). A self-employed person is considered both employer and employee, so they owe the full combined rate themselves - though half of this amount is typically deductible when calculating income tax.
How Net Earnings Are Calculated
Self-employment tax applies to net earnings (gross self-employment income minus business expenses), not gross revenue. The taxable base is also reduced slightly (multiplied by 92.35%) before the rate is applied, reflecting the employer-equivalent portion of the tax.
How to Use the Self-Employment Tax Calculator
- Open the Self-Employment Tax Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the self employment tax calculator works.
Frequently Asked Questions
How much is self-employment tax?
The combined Social Security and Medicare rate is 15.3% of net self-employment earnings (92.35% of net profit), covering both the employer and employee portions that a traditional job would split.
Is self-employment tax the same as income tax?
No - self-employment tax covers only Social Security and Medicare. You still owe separate federal (and possibly state) income tax on your net self-employment earnings.
Can I deduct any of my self-employment tax?
Yes - you can typically deduct half of your self-employment tax when calculating your adjusted gross income for income tax purposes, reflecting the employer-equivalent share.
How do I use this self employment tax calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Self-Employment Tax Calculator calculate?
Estimate Self-Employment Tax totals, payments, rates, and costs for financial planning. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this self-employment tax use?
The formula is: SE Tax = Net Earnings × 92.35% × 15.3%. The 92.35% adjustment and combined 15.3% rate (12.4% Social Security plus 2.9% Medicare) exist because self-employed workers must cover both the employee and employer share of these payroll taxes themselves. The Self-Employment Contributions Act of 1954 created this parallel system specifically so self-employed individuals would build the same Social Security and Medicare credits as traditional employees, whose employer quietly pays half of the equivalent tax without it appearing on a pay stub.
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Last updated: September 27, 2026.