Formula

Self-Employment Tax Rate Components

The SE tax rate is 15.3% of net self-employment earnings: 12.4% for Social Security (subject to an annual wage-base cap that changes yearly) plus 2.9% for Medicare (no cap). The taxable base is 92.35% of net earnings from self-employment. An Additional Medicare Tax of 0.9% applies above threshold amounts ($200,000 for most filers, $250,000 married filing jointly). Ask a CPA to confirm current-year thresholds and caps.

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Updated 2026-05-09

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