Formula

Self-Employment Tax Rate Components

The self-employment (SE) tax is calculated using the following formulas:

Taxable Base=Net SE Earnings×92.35%\text{Taxable Base} = \text{Net SE Earnings} \times 92.35\%

Standard SE Tax=(Taxable Base×12.4%)+(Taxable Base×2.9%)\text{Standard SE Tax} = (\text{Taxable Base} \times 12.4\%) + (\text{Taxable Base} \times 2.9\%)

Where:

  • The 12.4% component is for Social Security (subject to an annual wage-base cap that changes yearly).
  • The 2.9% component is for Medicare (no cap).
  • An Additional Medicare Tax of 0.9% applies to net self-employment earnings exceeding threshold amounts ($200,000 for single filers, $250,000 for married filing jointly).

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Updated 2026-06-30

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