Self-Employment Tax Calculator
Calculate Social Security and Medicare taxes on freelance and self-employment income under IRC Sections 1401-1403.
What Is Self-Employment Tax?
Self-employment tax is the Social Security and Medicare tax imposed on individuals who work for themselves. When you are an employee, your employer pays half of FICA taxes (7.65%) and you pay the other half through payroll withholding. When you are self-employed, you pay both halves -- the full 15.3% -- computed on Schedule SE and reported on Form 1040. The tax consists of two components: 12.4% for Social Security (Old-Age, Survivors, and Disability Insurance) on net earnings up to the annual wage base of $176,100 for 2025, and 2.9% for Medicare (Hospital Insurance) on all net earnings with no cap. An Additional Medicare Tax of 0.9% applies to combined wages and self-employment income exceeding $200,000 for single filers or $250,000 for married filing jointly, per IRC Section 3101(b)(2). Before computing the tax, your net self-employment earnings are multiplied by 92.35% (the equivalent of 100% minus the employer-equivalent 7.65%), and you then deduct 50% of the resulting SE tax from your adjusted gross income on Schedule 1.
How to Use This Calculator
Enter Net SE Earnings
This is your Schedule C net profit (line 31) or your distributive share from a partnership. Use net income after all business deductions.
Add Any W-2 Wages
W-2 wages count toward the Social Security wage base first. If your wages already exceed $176,100, only the Medicare portion of SE tax applies to your self-employment income.
Review the Breakdown
The calculator shows your Social Security and Medicare components separately, the Additional Medicare Tax if applicable, and the deductible half of SE tax that reduces your AGI.
Key Concepts
92.35% Net Earnings Factor
Your SE tax base is 92.35% of net self-employment income. This approximates the fact that employees only pay FICA on wages after the employer's share is excluded.
Social Security Wage Base
The 12.4% Social Security tax applies only up to $176,100 in 2025. W-2 wages reduce the remaining base available for SE tax.
Additional Medicare Tax
The 0.9% surtax under IRC 3101(b)(2) applies to combined wages + SE income above $200K (single) or $250K (MFJ). Only the employee portion; no employer match.
Deductible Half of SE Tax
IRC Section 164(f) allows you to deduct 50% of SE tax above the line on Schedule 1. This reduces AGI but not SE tax itself.
Schedule SE
IRS Schedule SE computes self-employment tax. The short form applies if you only have SE income; the long form handles multiple sources and the wage base interaction.
Expert Insights
The Freelancer Shock: Self-employment tax is the most overlooked burden for new freelancers. At 15.3% on top of income tax, a freelancer in the 22% bracket faces a combined marginal rate of approximately 37% before state taxes. Many first-year freelancers are blindsided by the April tax bill because they did not make quarterly estimated payments.
S-Corp SE Tax Reduction: The S-corporation election remains the primary SE tax reduction strategy for profitable self-employed individuals. By paying yourself a reasonable salary (subject to FICA) and taking remaining profit as distributions (not subject to SE tax), you can save 15.3% on the distribution portion. However, the IRS scrutinizes unreasonably low salaries. A common benchmark: salary should be at least 60% of net profit, or comparable to what you would earn performing the same work as an employee. The compliance costs of an S-corp make this cost-effective only above roughly $60,000-$80,000 in annual net profit.
Wage Base Check: Always check whether your W-2 wages have already maxed out the Social Security wage base before calculating SE tax. If your W-2 income exceeds $176,100, you owe only the 2.9% Medicare component (plus Additional Medicare Tax if applicable) on your self-employment earnings.
Frequently Asked Questions
This calculator provides estimates for educational purposes only. Tax laws change frequently and individual circumstances vary. These estimates do not constitute tax advice. Consult a qualified CPA or tax professional before making tax-related decisions.
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