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Self-Employment Tax Calculator.

Estimate your Social Security and Medicare taxes for 1099 income

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Results update as you type.

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

$8,478
14.1% Effective Rate
Quarterly Payment: $2,119.00

Quarterly Payment

$2,119.00
Monthly Reserve: $706.00

Monthly Reserve

$706.00
Social Security: $6,871.00

Social Security

$6,871.00
Medicare: $1,607.00

Medicare

$1,607.00
AGI Net After SE Tax:$55,761

*This does not include federal or state income taxes, which are calculated on your AGI.

FAQs

What is self-employment tax?

Self-employment tax consists of Social Security and Medicare taxes primarily for individuals who work for themselves. It is similar to the FICA taxes withheld from the pay of most wage earners.

What is the current self-employment tax rate?

The self-employment tax rate is 15.3%. This includes 12.4% for Social Security (up to a certain income limit) and 2.9% for Medicare on all net earnings.

How is self-employment tax calculated?

It is typically calculated on 92.35% of your net earnings from self-employment. Our calculator applies this rule automatically to give you an accurate estimate.

When do I need to pay self-employment tax?

If you expect to owe $1,000 or more in taxes, you generally must make quarterly estimated tax payments using Form 1040-ES.

Cite this calculator

Canonical URL: https://mathify.one/fr/business/self-employment-tax

Cite as: Mathify. (2026). Calculateur d'Impot Auto-entrepreneur. https://mathify.one/fr/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