Self-Employment Tax Calculator
Estimate Schedule SE tax and its deductible half from net business profit under a no-W-2-wages assumption.
Tax Planning · Last reviewed: August 10, 2026
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Overview
The Self-Employment Tax Calculator estimates the Social Security and regular Medicare portions of Schedule SE tax from entered net business profit. It also estimates the deductible half of that tax.
The calculator uses the regular 92.35% method and current effective governed rates and Social Security wage base. It assumes no W-2 Social Security wages or tips have already used that annual base.
Scope and Use
Use the estimate as a focused Schedule SE baseline when the entered amount represents net profit subject to self-employment tax and the zero-W-2-wages assumption fits the scenario.
Outside this model
- W-2 wages, tips, or railroad compensation that consume the Social Security base.
- Additional Medicare Tax and its filing-status-dependent thresholds.
- Farm and nonfarm optional methods for calculating net earnings.
- Church employee income, ministers, religious orders, special exemptions, and other Schedule SE adjustments.
- Income tax, qualified business income deductions, estimated tax, credits, withholding, and return preparation.
Inputs and Outputs
Labels and ordering follow the active Self-Employment Tax calculator configuration. Annual rates and the wage base are governed data rather than user-overridable assumptions.
| Field | Format | Meaning | Interpretation |
|---|---|---|---|
| Net Business Profitinput | Currency | Net business profit subject to Schedule SE before the regular-method 92.35% adjustment. | Combine and adjust business income as required before using the calculator; losses and zero are not accepted by this simplified interface. |
| Schedule SE Taxoutput | Currency | The sum of the calculated Social Security and regular Medicare components. | Additional Medicare Tax is excluded. The displayed amount is rounded independently to a whole dollar using half-up rounding. |
| Deductible Halfoutput | Currency | One-half of the unrounded calculated Schedule SE tax. | This is an adjustment used in income-tax calculations, not a reduction of the Schedule SE tax output itself. |
| Social Security Taxoutput | Currency | The Social Security rate applied to adjusted earnings up to the current effective wage base. | Assumes no W-2 Social Security wages, tips, or railroad compensation have used any of the base. |
| Medicare Taxoutput | Currency | The regular Medicare rate applied to all adjusted earnings. | Medicare has no wage-base cap here; Additional Medicare Tax is excluded. |
- Field
- Net Business Profitinput
- Format
- Currency
- Meaning
- Net business profit subject to Schedule SE before the regular-method 92.35% adjustment.
- Interpretation
- Combine and adjust business income as required before using the calculator; losses and zero are not accepted by this simplified interface.
- Field
- Schedule SE Taxoutput
- Format
- Currency
- Meaning
- The sum of the calculated Social Security and regular Medicare components.
- Interpretation
- Additional Medicare Tax is excluded. The displayed amount is rounded independently to a whole dollar using half-up rounding.
- Field
- Deductible Halfoutput
- Format
- Currency
- Meaning
- One-half of the unrounded calculated Schedule SE tax.
- Interpretation
- This is an adjustment used in income-tax calculations, not a reduction of the Schedule SE tax output itself.
- Field
- Social Security Taxoutput
- Format
- Currency
- Meaning
- The Social Security rate applied to adjusted earnings up to the current effective wage base.
- Interpretation
- Assumes no W-2 Social Security wages, tips, or railroad compensation have used any of the base.
- Field
- Medicare Taxoutput
- Format
- Currency
- Meaning
- The regular Medicare rate applied to all adjusted earnings.
- Interpretation
- Medicare has no wage-base cap here; Additional Medicare Tax is excluded.
Methodology
The regular method first multiplies entered net business profit by 92.35%. If that adjusted amount is below $400, all four outputs are zero.
Here N is entered net business profit and A is the amount used for the Schedule SE component calculations.
B is the current effective Social Security wage base. The cap is applied after the 92.35% adjustment; regular Medicare tax applies without that cap.
Full precision is retained through all calculations. Total tax, deductible half, Social Security tax, and Medicare tax are then rounded independently to whole dollars using half-up rounding.
Assumptions and Limitations
Model assumptions
- The entered amount is net profit subject to Schedule SE.
- The regular 92.35% method applies.
- No wages or tips have consumed the Social Security base.
- The current effective governed annual values apply.
Limitations
- There is no tax-year selection or annual-value override.
- Only regular Social Security and Medicare components are modeled.
- The calculator does not determine whether income is subject to Schedule SE.
- Each displayed whole-dollar output is rounded independently.
Selected Sources
- Topic No. 554, Self-Employment Tax
Internal Revenue Service · Retrieved August 10, 2026
The regular 92.35% method, $400 net-earnings threshold, Social Security and Medicare rates, uncapped regular Medicare treatment, deductible half, and existence of Additional Medicare Tax. It does not determine whether a user’s income is subject to Schedule SE.
Reviewed August 10, 2026
- Contribution and Benefit Base
Social Security Administration · Retrieved June 30, 2026
The current governed Social Security contribution and benefit base and the self-employment Social Security rate. It does not support the calculator’s zero-W-2-wages assumption or a user-specific tax result.
2026 contribution and benefit base