Self-Employment Tax Calculator
Calculate your US self-employment tax (Social Security + Medicare) on freelance income. See your SE tax due, deduction, and effective rate using 2025 IRS figures.
How the Self-Employment Tax Calculator Works
The self-employment tax calculator estimates the total Social Security and Medicare tax you owe on freelance, contractor, or sole proprietor income in the United States for the 2025 tax year. Unlike W-2 employees, who split these taxes 50/50 with their employer, self-employed workers pay both halves — a combined 15.3% on the first $176,100 of net earnings. This tool breaks down each component so you know exactly how much to set aside before filing your Schedule SE.
Only 92.35% of your net self-employment earnings are subject to SE tax, because the IRS first lets you deduct the employer-equivalent half. The calculator applies this adjustment automatically, then splits the result into the 12.4% Social Security portion (capped at the 2025 wage base of $176,100) and the 2.9% Medicare portion (uncapped). High earners also pay an Additional Medicare Tax of 0.9% on income above the filing-status threshold — $200,000 for single filers and $250,000 for married filing jointly.
One benefit softens the blow: half of your SE tax is an above-the-line deduction on your Form 1040, reducing your regular income tax. The calculator shows this deduction separately so you can plan for its income-tax impact. Use the result to fund your quarterly estimated payments or set aside cash in a dedicated tax savings account each month.
2025 Self-Employment Tax Rates and Thresholds
For 2025, the self-employment tax structure uses these IRS figures: Social Security is 12.4% on the first $176,100 of SE earnings (the 2025 wage base). Medicare is 2.9% on all SE earnings with no cap. The Additional Medicare Tax of 0.9% kicks in above $200,000 for single or head of household, $250,000 for married filing jointly, and $125,000 for married filing separately. If you also earn W-2 wages, those wages count toward both the Social Security wage base and the Additional Medicare threshold, which can reduce or eliminate the SS portion of your SE tax and trigger the Additional Medicare surtax sooner.
The calculator applies the 92.35% earnings adjustment, respects the combined W-2 plus SE cap on the Social Security base, and surfaces the half-SE-tax deduction you can claim on your 1040. For most single freelancers earning $50,000 to $150,000 in net SE income with no W-2 wages, SE tax alone costs roughly 14.1% of net earnings after the 92.35% adjustment, on top of regular federal and state income tax.
Self-Employed vs W-2: The True Tax Gap
A common mistake when leaving a salaried job is assuming your contractor rate should match your old gross salary. It should not. A W-2 employee earning $80,000 pays only 7.65% in FICA taxes ($6,120) because the employer covers the other half. A freelancer earning the same $80,000 in net SE income pays about $11,304 in SE tax — roughly $5,184 more. This calculator shows that gap directly so you can price contracts correctly. A fair contractor rate typically needs to be 25% to 35% higher than the equivalent W-2 salary to cover SE tax, self-funded health insurance, retirement contributions, and lost paid time off.
When Do Freelancers Pay Self-Employment Tax?
Self-employment tax is paid in two ways. First, via quarterly estimated tax payments using Form 1040-ES, due April 15, June 15, September 15, and the following January 15. Second, any remaining balance is reconciled on Schedule SE filed with your annual 1040. If you owe more than $1,000 at year-end and did not make quarterly payments, the IRS charges an underpayment penalty. Use the quarterly tax estimator linked below to plan each 1040-ES installment and avoid surprises.
Disclaimer: Estimate only. This tool is informational and is not tax advice. Figures are based on 2025 IRS rates and may change. Consult a qualified CPA or enrolled agent before filing.