Social Security and Medicare tax on business profit for sole proprietors and partners, currently 15.3 percent on most of that profit.
Self-employment tax is the Social Security and Medicare tax an employee and employer would split, paid entirely by the self-employed person on net profit. It applies whether or not you owe any income tax, and it is the tax an S corporation election is designed to reduce.
Not for investors. Trading gains are capital gains. Mining or staking run as a business, or fees earned for services paid in crypto, can be subject to it.
Last reviewed September 10, 2026. Tax rules change; confirm current law before acting.
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