Self Employment Tax Calculator — 15.3% SECA

How to use

1. Enter net self-employment profit (revenue minus expenses).
2. Add any W-2 wages that already paid into Social Security.
3. Pick your filing status for the 0.9% Medicare threshold.
4. Calculate to see the SS, Medicare and additional-Medicare split.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

Freelancers and 1099 contractors pay both halves of FICA through SECA: 15.3% covers 12.4% Social Security and 2.9% Medicare. This calculator starts from your net profit, applies the 92.35% factor the IRS uses, then splits the tax into its real pieces — Social Security stops at the $176,100 wage base (your W-2 wages count toward it), Medicare never caps, and an extra 0.9% applies over $200,000 of combined income or $250,000 married joint. You also see the employer-equivalent half you can deduct on Schedule 1, which softens the effective rate, plus the effective percentage of gross profit going to SECA. Net earnings under $400 are exempt and handled explicitly. It is an educational estimate, not professional advice, and your numbers never leave the browser — the whole Schedule SE flow-through runs locally with 2025 constants.

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