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Self-Employment Tax Calculator (SECA)
Estimate the 15.3% Self-Employment tax for freelancers and contractors. Includes the deductible half adjustment and quarterly estimate.
FINANCEEstimate Self-Employment Contributions Act (SECA) tax on freelance, 1099, or sole-proprietor income. SE tax = 15.3% on net earnings (12.4% Social Security + 2.9% Medicare).
You pay both the employee and employer halves of FICA, but half is deductible as an income-tax adjustment. SE income subject to tax = net earnings × 92.35%. The Social Security portion uses the official 2026 wage base of $184,500; Medicare is uncapped. Additional Medicare Tax can apply above the relevant filing threshold.
Disclaimer: SE tax is separate from federal income tax. If you expect to owe $1,000+, you must make quarterly estimated payments (Apr 15, Jun 15, Sep 15, Jan 15) or face an underpayment penalty.
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Frequently Asked Questions
What is the Self-Employment Tax Calculator (SECA) for?
Estimate Self-Employment Contributions Act (SECA) tax on freelance, 1099, or sole-proprietor income. SE tax = 15.3% on net earnings (12.4% Social Security + 2.9% Medicare).
How do I use the Self-Employment Tax Calculator (SECA)?
You pay both the employee and employer halves of FICA, but half is deductible as an income-tax adjustment. SE income subject to tax = net earnings × 92.35%. The Social Security portion uses the official 2026 wage base of $184,500; Medicare is uncapped. Additional Medicare Tax can apply above the relevant filing threshold.
How accurate are my self-employment tax (seca) results?
SE tax is separate from federal income tax. If you expect to owe $1,000+, you must make quarterly estimated payments (Apr 15, Jun 15, Sep 15, Jan 15) or face an underpayment penalty.
Is the Self-Employment Tax Calculator (SECA) free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.