Estimate your self-employment tax including Social Security and Medicare contributions. See the deductible half and your effective SE tax rate.
Self-employed workers pay both the employer and employee portions of Social Security and Medicare taxes — a combined 15.3% on net earnings. This calculator helps freelancers, contractors, and gig workers estimate their quarterly tax obligations and avoid underpayment penalties.
This self-employment tax calculator estimates the Social Security and Medicare taxes owed by self-employed individuals. The methodology applies the 15.3% combined tax rate to 92.35% of your net self-employment earnings (the taxable portion), with Social Security capped at the wage base limit ($168,600 for 2024, $176,100 for 2025) and Medicare applying to all earnings with an additional 0.9% surtax on income above $200,000 (single) or $250,000 (married). The calculator shows the deductible half of SE tax (which reduces your income tax liability but does not reduce the SE tax itself). Understanding SE tax is critical for freelancers, independent contractors, gig workers, and small business owners who do not have employer-paid FICA taxes. Real-world applications include budgeting for quarterly estimated tax payments, evaluating the true cost of self-employment, and understanding how business expenses reduce both income tax and SE tax through the 92.35% adjustment. Limitations include not accounting for the additional Medicare tax, state self-employment taxes, or the qualified business income (QBI) deduction under Section 199A.
Result: Self-employment income of $100,000 results in a taxable SE income of $92,350 ($100,000 x 92.35%). The SE tax is $14,129.55 (15.3% x $92,350). You can deduct half of this ($7,065) from your income for income tax purposes, reducing your income tax by approximately $1,900 in the 22% bracket. The effective SE tax rate after the deduction is roughly 7.65% of net earnings.
Understanding how to use financial calculators effectively requires knowing the underlying concepts. The self-employment tax involves several key financial principles that affect your results.
Our calculator uses industry-standard formulas verified by certified financial professionals. The inputs you provide are processed entirely in your browser — we never store or transmit your financial data. Results update in real time as you adjust values, allowing you to explore different scenarios quickly.
For the most accurate results, use current figures from your most recent financial statements. If you are unsure about a specific input, our default values represent national averages based on data from the Federal Reserve, IRS, and Bureau of Labor Statistics.
Remember that calculator results are estimates for educational purposes. Your actual financial situation may differ based on factors like your credit score, specific lender terms, local regulations, and market conditions. We recommend consulting with a qualified financial professional before making major financial decisions.
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Results are estimates only and not financial advice. Calculator logic verified by Sarah Rodriguez, EA. Full disclaimer · Methodology