Self-Employment Tax in 2026: What the 15.3% Really Applies To

Start with profit, not payments received

Forms 1099-NEC and 1099-K report payments, not taxable profit. Ordinary and necessary business expenses are subtracted on Schedule C first. Self-employment tax begins with the resulting net profit, so clean bookkeeping matters more than the number printed on a single information form.

The Schedule SE method generally multiplies net profit by 92.35%. The resulting net earnings are the amount used for Social Security and regular Medicare tax. If net earnings are below $400, Schedule SE tax generally is not due, although the income can still affect income tax.

The two parts behave differently

Social Security tax is 12.4% for a self-employed person, but it stops when combined covered earnings reach the 2026 wage base of $184,500. Your own W-2 wages use that same individual cap before self-employment earnings are considered.

Regular Medicare tax is 2.9% and has no wage cap. An additional 0.9% may apply above filing-status thresholds. Married couples filing jointly must consider combined Medicare wages and self-employment income, while each spouse still has an individual Social Security wage base.

Why the deductible half is not a refund

Half of the regular Schedule SE tax is generally an adjustment that reduces adjusted gross income. It does not reduce the Schedule SE tax itself, and Additional Medicare tax is not included in that deductible half. The adjustment can also change deductions tied to business income, including QBI.

Federal income tax is a separate layer. A freelancer can owe self-employment tax even when the standard deduction leaves little regular income tax, and can owe both when taxable income rises through the federal brackets.

A practical reserve workflow

Update profit monthly, not just revenue. Recalculate after large expenses, a W-2 job change, or a major increase in business income. Compare the resulting annual tax with withholding and the prior-year safe harbor before deciding what to send each quarter.

Use the calculator for planning, then use Schedule SE, Form 8959 when applicable, and a qualified tax professional for filing decisions. State income tax, credits, retirement contributions, health-insurance deductions, and other return items can materially change the amount to reserve.

Keep a year-end copy of the profit report, mileage log, major receipts, 1099 forms, and each estimated-payment confirmation. Reconcile payment forms to your own books instead of assuming every form is complete. Good records make the projection easier to update and give a preparer a traceable starting point when the return is filed.