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自雇税计算器.
估算 1099 收入的社会保障与医疗保险税（美国）
此计算器尚未完全翻译——部分文本以英文显示。
输入数值
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Income Details
Total income after business expenses, but before taxes.
About SE Tax:
In the US, self-employed individuals pay both the employer and employee portions of Social Security and Medicare taxes.
Total Estimated SE Tax
*This does not include federal or state income taxes, which are calculated on your AGI.
Cite this calculator
Canonical URL: https://mathify.one/zh/business/self-employment-tax
Cite as: Mathify. (2026). 自雇税计算器. https://mathify.one/zh/business/self-employment-tax
Use Cases
Estimate quarterly tax payments
Freelancers and independent contractors can use this calculator to estimate their self-employment tax liability, helping them set aside money for quarterly estimated tax payments.
Example: If your net earnings are $50,000, the calculator shows an estimated self-employment tax of about $7,065.
Plan for tax season
Side-hustle earners can project their annual self-employment tax to avoid surprises at tax time and budget accordingly.
Example: Enter your expected net earnings for the year to see the estimated tax amount.
Frequently Asked Questions
- How is self-employment tax calculated?
- The calculator uses your net earnings (after business expenses) to compute the self-employment tax. It applies the 15.3% rate (12.4% for Social Security and 2.9% for Medicare) to 92.35% of your net earnings, as per IRS rules.
- Do I need to pay self-employment tax if I have a regular job?
- Yes, if you have self-employment income (e.g., freelance or side-hustle) in addition to a regular job, you may owe self-employment tax on that income, even if your employer withholds Social Security and Medicare taxes from your wages.
- What is the difference between self-employment tax and income tax?
- Self-employment tax covers Social Security and Medicare contributions, similar to the payroll taxes withheld from employees. Income tax is separate and based on your total taxable income. This calculator only estimates the self-employment tax portion.
Tips & Common Mistakes
Tips
- Enter your net earnings (after deducting business expenses) for the most accurate estimate.
- Remember that self-employment tax is in addition to federal income tax; plan for both.
- If you have multiple income sources, calculate each separately and combine the results.
- Consider making quarterly estimated tax payments to avoid underpayment penalties.
Common Mistakes to Avoid
- Using gross income instead of net earnings – you must subtract business expenses first.
- Forgetting that only 92.35% of net earnings are subject to self-employment tax.
- Assuming the calculator includes income tax – it only estimates Social Security and Medicare taxes.
Last updated: August 13, 2026