Self-Employment Tax Calculator
A self-employment tax calculator estimates the regular Social Security and Medicare taxes on net self-employed earnings. Enter your 2026 net business profit and your own Social Security wages and tips from employment. The result separates the two tax components and estimates the deductible half; it does not calculate your complete federal or state income tax.
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Report a calculation issue Self-Employment Tax Calculator: purpose and method
A self-employment tax calculator estimates the regular Social Security and Medicare taxes on net self-employed earnings. Enter your 2026 net business profit and your own Social Security wages and tips from employment. The result separates the two tax components and estimates the deductible half; it does not calculate your complete federal or state income tax.
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Method and test recordFormula v1.0.1
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- Not recorded
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- CalculatorGeek
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- CalculatorGeek Editorial Team
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- Definition fixtures
- 3 configured scenarios
- Published examples
- 3 shown below
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No tool-specific review method has been recorded.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
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Method sources
Latest model update
2026-10-28 - Created from finished package copy and deterministic contract.
Reference inputs and expected results
Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| Standard profit | Profit: 100000; Individual Social Security Wages: 0 | Net Earnings: 92350; Social Security: 11451.4; Medicare: 2678.15; Total: 14129.55 (allowed numeric tolerance: 1.0E-6) |
| Wage cap exhausted | Profit: 100000; Individual Social Security Wages: 184500 | Net Earnings: 92350; Social Security: 0; Medicare: 2678.15; Total: 2678.15 (allowed numeric tolerance: 1.0E-6) |
| Below net-earnings threshold | Profit: 400; Individual Social Security Wages: 0 | Net Earnings: 369.4; Social Security: 0; Medicare: 0; Total: 0 (allowed numeric tolerance: 1.0E-6) |
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On this page
Enter net profit for one person
Use profit after deductible business expenses, not sales or the amount clients deposited into your account. Combine the business income and losses that belong in your regular self-employment-tax calculation before entering the total. Special farming methods, clergy rules, and other exceptions require separate treatment.
If you also have a job, enter your own wages already subject to Social Security tax. Those wages reduce the remaining annual Social Security wage-base room available for self-employed earnings. For ordinary W-2 employment, check boxes 3 and 7 rather than using Box 1. Do not enter your spouse's wages in this field: the wage base applies separately to each person.
The calculator does not classify workers or decide whether income belongs on Schedule C, a partnership return, or payroll. Entity and income classification affect which tax rules apply. Use the amount appropriate to your situation rather than assuming every business payment is self-employment income.
How regular self-employment tax is calculated
Under the regular method, net earnings are generally 92.35% of the entered net profit. The Social Security portion applies at 12.4%, subject to the remaining annual wage base, while the regular Medicare portion applies at 2.9% without that Social Security cap. See the IRS self-employment tax explanation.
For 2026, the Social Security wage base is $184,500, as shown in IRS Publication 15. The calculation uses the smaller of net self-employed earnings or the unused wage-base amount after your employment wages.
This tool excludes Additional Medicare Tax. It also excludes income tax, credits, estimated-tax penalties, and state taxes. The deductible half shown here relates to the regular self-employment tax calculation; it is an income adjustment, not a dollar-for-dollar refund of that amount.
Example: $100,000 net profit
Assume one person has $100,000 of net profit in 2026, no employment wages, and no special calculation method.
| Calculation | Amount |
|---|---|
| Net profit × 92.35% | $92,350.00 |
| Social Security portion: $92,350 × 12.4% | $11,451.40 |
| Medicare portion: $92,350 × 2.9% | $2,678.15 |
| Regular self-employment tax | $14,129.55 |
| Deductible half before tax-return rounding | $7,064.78 |
The result is not the person's total tax bill. Federal income tax may also apply, and other income or credits can change the final return. The figures keep full calculation precision internally and round currency for display.
Now assume the same person already has $184,500 of Social Security wages and tips in 2026. In this simplified example, no additional Social Security portion remains on the self-employed earnings, but the $2,678.15 regular Medicare portion still applies. Additional Medicare Tax may need separate assessment.
Plan for payments without confusing the taxes
Use the result as one component of your annual tax estimate. Dividing this number by four does not automatically produce the correct federal quarterly payment: estimated payments can include income tax and other taxes, and withholding, credits, prior-year safe harbors, and payment timing matter.
Keep business cash needs separate from the tax calculation. The business loan calculator can help estimate financing payments, but paying loan principal is not automatically a business expense in the profit field. The retirement withdrawal calculator is a separate planning tool for future spending; it does not replace current contribution or tax rules.
Frequently asked questions
Does the $400 threshold refer to gross sales?
No. The general regular-method filing threshold relates to net self-employed earnings, after the applicable adjustment. Special rules can apply. A $400 net profit entry becomes $369.40 of net earnings under this model, so it produces no regular self-employment tax here.
Does 15.3% apply to every dollar of profit?
No. The regular method first applies the net-earnings adjustment, and the Social Security portion is capped. The Medicare portion has different treatment. That is why multiplying all profit directly by 15.3% can be misleading.
Does my spouse's salary reduce my Social Security tax?
No. Enter only your own applicable employment wages for this calculation. A joint tax return does not combine the two spouses' individual Social Security wage bases.
Is Additional Medicare Tax included?
No. Its calculation depends on additional facts and thresholds. This tool clearly reports regular Social Security and Medicare amounts only, so high-income users should include the additional tax in their broader tax projection when applicable.
Can I deduct the entire self-employment tax?
The ordinary income adjustment shown by this model is one-half of regular self-employment tax. It does not erase the tax itself. Follow the applicable return instructions for the actual deduction and rounding.
Enter your net profit and individual employment wages, then carry the regular self-employment-tax estimate into a complete annual tax and payment plan.