Self-Employment Tax Calculator for 2026

What is self-employment tax?

Self-employment tax is the self-employed worker's equivalent of FICA payroll tax. W-2 employees split FICA with their employer: Social Security at 6.2% each and Medicare at 1.45% each. Self-employed individuals pay both shares themselves — 12.4% Social Security and 2.9% Medicare on adjusted net self-employment earnings.

Federal income tax is calculated separately on income after the statutory self-employment tax deduction. You can deduct 50% of your self-employment tax from gross income when computing federal income tax under 26 U.S.C. §164(f). This reduces taxable income but does not reduce the cash you pay for the full FICA-equivalent amount.

How is self-employment tax calculated?

The calculation starts with net self-employment income — gross self-employment revenue minus allowable business expenses. The engine applies the statutory earnings base adjustment: net self-employment income is multiplied by 92.35% (equivalent to 1 minus the combined employee FICA rates of 6.2% Social Security and 1.45% Medicare) before self-employment tax rates apply.

Combined self-employment tax on the adjusted base is 15.3% — 12.4% Social Security up to the annual wage base and 2.9% Medicare on all adjusted earnings, with additional Medicare tax above IRS thresholds for higher earners. ExactTakeHome applies the same multipliers encoded in the tax engine used by our W-2 vs 1099 comparison calculator.

Self-employment tax vs W-2 employment

A W-2 employee sees 7.65% FICA withheld from each paycheck while the employer pays the matching 7.65% separately. A self-employed worker pays the full 15.3% through self-employment tax, which is why contractor gross rates often need to exceed W-2 salary offers to produce the same net income. State income tax applies to both W-2 wages and self-employment profit in most states.

Self-employed workers also make quarterly estimated tax payments because no employer withholds on their behalf. Use our paycheck calculator to model W-2 scenarios for side-by-side comparison.

How to use this self-employment tax calculator

Use this self-employment tax calculator when you need to turn gross freelance or business income into a more realistic after-tax number. Start with net profit, not top-line revenue, because self-employment tax applies after ordinary and necessary business expenses are removed. Then compare the result with a W-2 scenario if you are deciding whether a contract rate is actually competitive with salaried employment.

The tool is especially useful for rate setting. Many independent workers know the client budget they want to quote but underestimate how much extra gross income is needed to cover both halves of payroll tax, federal income tax, state income tax, and quarterly payments. Modeling those costs before you accept the work is usually easier than trying to catch up after the invoices are already out.

It also helps with quarterly planning. If the estimate looks materially higher than expected, that is a signal to reserve more cash for estimated payments, revisit deductions, or compare whether an S-corp or W-2 structure is worth discussing with a tax professional. The value of the calculator is not just the number itself, but the clearer picture it gives you of contractor cash flow.

Why contractors compare this with W-2 pay

A freelance rate often looks attractive until you account for the full payroll-tax burden, unpaid time off, benefits, and quarterly tax administration. Comparing self-employment tax with a W-2 paycheck estimate is one of the fastest ways to see whether a contract offer really compensates for those differences or only looks larger on the gross invoice line.

That comparison is useful for side gigs as well as full-time independent work. Even a part-time contracting arrangement can create a different tax-planning burden than a regular paycheck, and seeing the combined effect in one place makes it easier to price the work responsibly.

Frequently Asked Questions