Glossary · Tax & Accounting
Self-Employment Tax (SE Tax).
15.3% federal tax on net self-employment income (12.4% Social Security + 2.9% Medicare); paid by sole proprietors, partners, and LLC owner-operators.
What it is
Self-Employment (SE) Tax is a 15.3% federal tax on net self-employment income. It consists of 12.4% Social Security (capped at the $168,600 wage base in 2026) plus 2.9% Medicare (no cap, with an additional 0.9% Medicare surtax kicking in above $200K AGI for single filers). Sole proprietors, partners, and LLC members pay SE tax; S-corp owners pay through payroll instead, a different and often lower-net structure.
SE tax is calculated on Schedule SE and reported on Form 1040. One-half of SE tax is deductible as an above-the-line adjustment on Form 1040 — that deduction partially offsets the regressivity of the tax. SE tax is in addition to federal and state income taxes; it is not a substitute. For most owner-operators filing as sole proprietors or single-member LLCs, SE tax is the largest single federal-tax line item on a profitable year.
Why it matters for trucking finance
SE tax is the most underappreciated cost of self-employment for new owner-operators — many calculate their take-home assuming they'll pay only regular income tax, then are shocked by the 15.3% SE adder. On $80K of net profit, SE tax alone is $12,240. The financial-planning implication: budget at least 30–35% of net income for federal taxes (income + SE). Some owner-ops elect S-corp status to reduce SE tax through a reasonable-salary + distribution structure (consult a CPA — IRS scrutinizes unreasonably low salaries). Lenders evaluating owner-op tax returns understand SE tax as part of normal operating cost.
Related terms
- Quarterly Estimated Taxes (1040-ES) — Federal estimated tax payments due quarterly (April, June, September, January) for self-employed taxpayers including owner-operators.
- Schedule C — IRS Form 1040 Schedule C — Profit or Loss from Business; used by sole-proprietor owner-operators to report business revenue, expenses, and net profit.
- Independent Contractor Classification — IRS, DOL, and state-level legal classification of worker as 1099 contractor (vs W-2 employee); test factors vary; misclassification is a major regulatory risk.
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