Federal estimate only. It excludes state/local tax, credits, QBI, and detailed income-tax brackets.
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Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
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What does this calculator estimate?
1099 self employment tax calculator: estimate 2026 SECA tax at 15.3% on net self-employment earnings plus a quarterly payment planner. Free, no signup.
Why is the SECA rate effectively 15.3% and not 12.4%?
Self-employment tax combines the 12.4% Social Security component with the 2.9% Medicare component. A companion rule softens the blow: you may deduct the employer-equivalent half when computing income tax, though not for SECA itself. Net earnings are also reduced by 7.65% before the rate applies, which the calculator incorporates so the estimate matches how the tax actually computes.
Do I owe SECA on all of my 1099 income?
The tax applies to net earnings from self-employment above a small threshold, computed after business expenses, and the Social Security portion caps once annual earnings pass the wage base, including W-2 wages. Someone with both a salary and freelance income may hit the cap through the job, leaving only Medicare tax on the side income. Enter totals accordingly.
How this calculator works
Formula
Net earnings subject to self-employment tax = net business profit × 92.35%. Social Security and Medicare rates are then applied subject to the entered wages and filing-status thresholds.
Worked example
$100,000 revenue less $20,000 expenses = $80,000 net profit; $73,880 subject to SE tax after the 7.65% adjustment, an $11,303.64 tax, about $2,825.91 set aside per quarter.
Assumptions to verify
- The calculation is a federal planning estimate, not a complete tax return.
- State/local tax, credits, QBI, and detailed income-tax brackets are excluded.
- The optional marginal income-tax percentage is user-entered and does not calculate progressive brackets.
Frequently asked questions
Why is net profit multiplied by 92.35%?
Schedule SE uses a statutory adjustment before applying the Social Security and Medicare portions of self-employment tax.
What is the deductible half of SE tax?
A portion of self-employment tax is generally deductible when calculating adjusted gross income; it does not reduce the SE tax itself.
Is the quarterly amount an official estimated payment?
No. It combines simplified SE-tax and optional income-tax estimates. Complete estimated payments depend on the full return and prior-year safe-harbor rules.
Cite this tool
BoringToolsKit. “1099 Income Tax Calculator.” boringtoolskit.com/self-employment-tax/. Free to reference in articles, syllabi, and answer posts with a link.
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