Self-employment tax covers Social Security and Medicare for people working for themselves. It is separate from income tax, so multiplying business profit by an income tax bracket will not give a complete tax estimate. This US overview was checked in September 2026.
Who generally pays it?
The IRS explains that self-employment tax generally applies when net self-employment earnings are at least $400, with special rules for some situations. Schedule SE is used for the calculation. The usual combined rate is 15.3%: 12.4% Social Security and 2.9% Medicare. Additional Medicare Tax may apply at higher income levels.
The employer-equivalent portion is generally deductible when calculating adjusted gross income. That deduction affects income tax; it does not eliminate the self-employment tax itself.
Use the correct earnings cap for the tax year
The Social Security Administration sets the 2026 taxable maximum at $184,500, compared with $176,100 for 2025. This limit concerns Social Security; the regular Medicare component has no equivalent earnings cap. Wages from employment can affect the Social Security portion still due on self-employment earnings.
A return filed in 2026 for 2025 income uses the 2025 rules. Do not use a current-year headline number without checking which year's earnings you are calculating.
A simplified example below the cap
Suppose a sole proprietor has $50,000 of net business profit, no other wages and no special adjustments. Under the ordinary method, $50,000 × 92.35% gives $46,175 of net earnings for this calculation. Applying 15.3% produces approximately $7,064.78 before return rounding. This illustrates self-employment tax only, not total federal or state tax.
The calculation method and estimated-tax worksheet are in Publication 505 for 2026. Use the actual forms or a preparer when wages, losses, additional taxes or special rules complicate the calculation.
Make the profit figure reviewable
Before calculating tax, check that business income and costs are complete and not duplicated. Retain platform and customer income records, and distinguish gross activity from net bank payouts. On the expense side, preserve the original documents and the reason for the purchase.
Receiptor AI can collect receipts and invoices from email and recover older documents through historical extraction. Duplicate handling helps with forwarded copies; transaction groups help organize related invoices and receipts. Review personal use, unclear entities and accounting treatment before relying on the totals.
Plan payments using a current estimate
Self-employment income may require estimated payments during the year. Update the estimate when profit or other income changes instead of reserving a fixed percentage without checking the result. Keep payment confirmations with the relevant tax year.
For the accounting handoff, Receiptor connects reviewed purchase evidence with Xero or QuickBooks. Your tax software or adviser then applies the tax rules to the completed records. Receipt collection helps establish the inputs; it is not a calculation of your final liability.
