Planning calculator · Assumptions reviewed July 12, 2026
Self-Employment Tax Calculator
Estimate the self-employment tax components that may apply to net business earnings. Federal income tax is shown separately when you choose to enter a planning rate.
Estimated result
Calculation breakdown
Amounts are rounded to the nearest dollar for planning. They are not a tax return or payment instruction.
Understand your estimate
What these numbers mean
Use this result as a planning checkpoint, then verify the inputs and official rules that apply to you.
What these numbers mean
The result separates net business profit, earnings subject to self-employment tax, Social Security tax, Medicare tax, and any additional planning reserve.
How they were calculated
Entered income is reduced by business expenses. The statutory net-earnings percentage and configured wage-base rules are then applied before the Social Security and Medicare components are added.
Common mistakes
Do not enter gross receipts as profit, count the same expenses twice, or forget W-2 wages that may use part of the Social Security wage base.
Important assumptions
The calculator uses the selected filing status, 2026 configuration, nonnegative entries, and any federal percentage as a separate planning assumption.
Why an actual return may differ
An actual return may differ because of multiple businesses, partnership income, optional methods, clergy or farm rules, credits, deductions, and other income.
How this estimate works
Net earnings equal gross income plus other relevant self-employment income minus business expenses. The configured SE-taxable percentage is applied, followed by separately displayed Social Security and Medicare components. The optional federal estimate applies only your entered rate to net income and is not combined into self-employment tax.
Assumptions
- Uses centrally documented federal planning constants labeled Requires annual verification.
- Additional Medicare threshold varies by filing status and is applied only to the entered self-employment earnings in this simplified model.
- The deductible portion is estimated as one-half of the regular Social Security and Medicare components.
Limitations
This simplified model does not coordinate the Social Security wage base with W-2 wages, calculate income-tax brackets, qualified business income, special church or farm rules, or every adjustment.
Frequently asked questions
Are these results tax advice?
No. They are simplified educational estimates. Use current official guidance or a qualified professional for decisions.
Are my entries sent anywhere?
No. Calculations run locally in your browser and this site does not submit calculator entries to a server.
Why are results rounded?
Whole-dollar display avoids suggesting precision that a simplified estimate cannot support.
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Records and explanations for this estimate
Use these guides to improve inputs and review important limitations.
Educational guides
Profession guides
State planning
Check your state requirements
Federal results do not automatically include state or local tax.
Browse the State Tax Center for all 50 state guides and official agency links. Tax laws and rates change regularly. Verify current state requirements before filing.
Related IRS forms and publications
Planning scope
Results and examples are planning estimates and hypothetical illustrations. 1099TaxCalcs.com does not prepare or file tax returns and does not replace IRS, SSA, state, or local instructions. Tax rules can change, state and local taxes or specialized rules may be excluded, and eligibility depends on individual facts. Verify current official sources and consider a qualified professional when the decision is material or complex.
Tax disclaimer
This tool provides a simplified informational estimate, not tax, legal, accounting, or financial advice. Tax rules and individual circumstances vary. Verify current rules with official IRS guidance and consult a qualified tax professional.