Planning calculator · Assumptions reviewed July 12, 2026

Self-Employment Tax Calculator

Estimate the self-employment tax components that may apply to net business earnings. Federal income tax is shown separately when you choose to enter a planning rate.

Estimated result

Calculation breakdown

Net self-employment income—

SE-taxable portion—

Social Security component—

Medicare component—

Additional Medicare estimate—

Total self-employment tax—

Estimated deductible portion—

Separate federal income-tax estimate—

Amounts are rounded to the nearest dollar for planning. They are not a tax return or payment instruction.

How this estimate works

Net earnings equal gross income plus other relevant self-employment income minus business expenses. The configured SE-taxable percentage is applied, followed by separately displayed Social Security and Medicare components. The optional federal estimate applies only your entered rate to net income and is not combined into self-employment tax.

Assumptions

Uses centrally documented federal planning constants labeled Requires annual verification.
Additional Medicare threshold varies by filing status and is applied only to the entered self-employment earnings in this simplified model.
The deductible portion is estimated as one-half of the regular Social Security and Medicare components.

Limitations

This simplified model does not coordinate the Social Security wage base with W-2 wages, calculate income-tax brackets, qualified business income, special church or farm rules, or every adjustment.

Frequently asked questions

Are these results tax advice?

No. They are simplified educational estimates. Use current official guidance or a qualified professional for decisions.

Are my entries sent anywhere?

No. Calculations run locally in your browser and this site does not submit calculator entries to a server.

Why are results rounded?

Whole-dollar display avoids suggesting precision that a simplified estimate cannot support.

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