Self Employment Tax Calculator

Estimate self-employment tax on net business income. The calculator applies the Schedule SE earnings adjustment, Social Security wage base limits, Medicare tax, and Additional Medicare tax assumptions.

Self-Employment Inputs

Schedule SE Estimate

Applies the 92.35% Schedule SE adjustment, Social Security wage base limits, and Medicare rules.

Schedule SE Income

$83,115

Remaining SS Wage Base

$184,500

Social Security Tax

$10,306

Medicare Tax

$2,410

Additional Medicare Tax

Schedule SE Tax

$12,717

Total SE + Addl Medicare

$12,717

Deductible Half

$6,358

Tax data and review status

These tax calculator estimates use 2026 federal income-tax brackets, 2026 FICA values, and state income-tax data that is versioned separately. They were reviewed on June 2, 2026. Treat results as planning estimates, not tax, payroll, legal, or financial advice.

How Self-Employment Tax Is Estimated

Core formula

Net business income × 92.35% = Schedule SE income, then apply Social Security and Medicare rates

Best use case

The calculator adjusts net earnings first, applies the Social Security wage base limit, and then estimates Medicare tax on the adjusted earnings.

Important limits

Optional wage inputs help reduce the remaining Social Security wage base when you also have W-2 income.
Additional Medicare tax is estimated separately because it is not the same as Schedule SE tax.
Federal and state income tax on business profits are not included on this page.

Data Sources and Review Process

Tax rates are stored in versioned JSON files and should be checked against official federal, FICA, and state sources during each annual update. Federal and FICA values are current for 2026; state data is versioned separately.

Self Employment Tax Calculator FAQ

What is self-employment tax?

Self-employment tax is the self-employed equivalent of Social Security and Medicare payroll taxes. It generally applies to 92.35% of net business income, subject to the Social Security wage base and Medicare rules.

Does this include federal income tax on self-employment income?

No. This page focuses on Schedule SE style payroll taxes. You may still owe federal and state income tax on business profits in addition to the self-employment estimate shown here.

Why can I enter W-2 wages already subject to Social Security?

Because the Social Security portion of self-employment tax shares the annual wage base ($184,500) with wages already taxed through payroll. Existing W-2 wages can reduce the remaining cap.