Self-Employment Tax Calculator 2026

This figure is stated everywhere and explained almost nowhere, but it follows from a fairness principle.

An employee is not taxed on their employer's share of payroll tax. That money is a business expense of the employer, and it never appears in the employee's income. To put self-employed people on the same footing, the law lets you exclude the equivalent amount from your own taxable earnings.

The employer-equivalent half is 7.65%. Excluding it means taxing only 100% − 7.65% = 92.35% of net profit.

So the multiplier is not a discount or a rounding convenience. It is the mechanism that stops you paying self-employment tax on the portion of your income that stands in for an employer contribution — money an employee would never have been taxed on.

Self-employment tax applies to net earnings from a trade or business you carry on. Not all income qualifies, and the distinction matters because it changes the rate substantially.

Subject to SE tax —

sole proprietor and single-member LLC profit, general partnership distributive shares, freelance and contractor income, most gig work, and director fees.

Not subject —

wages already taxed through payroll, S-Corp distributions above a reasonable salary, most rental income, interest, dividends, and capital gains.

The $400 threshold —

you must file Schedule SE once net self-employment earnings reach $400. Below that the tax does not apply, though the income remains subject to income tax.

Losses —

a business loss produces no SE tax, and can offset other income for income tax purposes subject to at-risk and passive activity rules.

The rate is fixed by statute and cannot be negotiated. What you can change is the amount of profit it applies to, and there are three genuine levers.

Business expenses are the most direct. Every allowable deduction reduces net profit, and therefore reduces both SE tax and income tax — which is why a deductible expense effectively costs far less than its price. At a 22% marginal rate plus 15.3% SE tax, a $1,000 expense reduces tax by roughly $340.

Retirement contributions are the second. A SEP-IRA or solo 401(k) reduces income tax but note carefully: contributions do not reduce self-employment tax, because SE tax is computed on net profit before retirement deductions. This is widely misunderstood.

The S-Corp election is the third and the largest for higher earners, because only the salary portion faces payroll tax. It carries real costs — payroll processing, a separate return, state fees — and requires paying yourself reasonable compensation, so it generally makes sense above roughly $50,000–$60,000 of profit.

Nobody withholds this for you. The US tax system is pay-as-you-go, so self-employment tax and income tax must be sent in four instalments during the year — due 15 April, 15 June, 15 September and 15 January following.

Missing them triggers an underpayment penalty calculated like interest from each missed date, even if you pay the full balance at filing. The safe harbour rules protect you: pay 100% of last year's total tax (110% if prior-year AGI exceeded $150,000) and no penalty applies regardless of how much you actually earn.

A practical approach is to set aside 25–30% of every payment received as it arrives, in a separate account. Self-employment tax alone is roughly 14% of profit, before any income tax, which is why the intuitive "save 20%" often falls short.