Calwarden

Self-Employment Tax Calculator

Estimate self-employment tax and optional income tax reserve from net business income using editable rates.

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Results

Total Tax Reserve
Self-Employment Tax$14,129.55
Income Tax Reserve$20,000.00
After-Reserve Income$65,870.45

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Assumptions

  • Rates are user-entered planning assumptions.
  • The estimate does not replace accounting, tax, payroll, legal, or marketplace-specific guidance.
  • Inputs are processed locally in the browser.

Sensitivity preview

Net Self-Employment Income -10%: Total Tax Reserve $30,716.59

Net Self-Employment Income Current: Total Tax Reserve $34,129.55

Net Self-Employment Income +10%: Total Tax Reserve $37,542.51

Formula: Self-employment tax = net income * SE taxable percent * SE tax rate. Total reserve adds net income * income tax reserve rate.

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About this Self-Employment Tax Calculator

Self-employed workers often need to reserve for both self-employment and income taxes. This calculator keeps the rates editable.

Who this calculator is for

  • Freelancers, founders, consultants, and small business operators.
  • Bookkeepers and finance teams doing quick planning checks.
  • Anyone comparing pricing, tax, payment, or marketplace assumptions.

When to use it

  • Model a planning scenario before changing pricing or workflow.
  • Compare best-case and conservative assumptions.
  • Turn business inputs into a transparent estimate.

How to use this calculator

  1. Enter your current or planned business assumptions.
  2. Adjust rates and fees to match your situation or provider.
  3. Review the primary result and supporting breakdown.

Key assumptions

  • Rates are user-entered planning assumptions.
  • The estimate does not replace accounting, tax, payroll, legal, or marketplace-specific guidance.
  • Inputs are processed locally in the browser.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

SE taxable income = net income x taxable percentage. SE tax = SE taxable income x SE tax rate. Total reserve optionally adds net income x income tax reserve rate.
Self-employment tax = net income * SE taxable percent * SE tax rate. Total reserve adds net income * income tax reserve rate.

Inputs explained

Revenue and volume

The sale, customer, invoice, or workload amount being modeled.

Rates and fees

Editable percentages, flat fees, or tax rates used in the estimate.

Costs

Direct expenses, platform fees, labor, support, or other assumptions that reduce profit or take-home pay.

Understanding your results

Estimated total reserve is a planning amount. Your filing result can differ because of deductions, credits, thresholds, and entity structure.

Example scenarios

Planning example

$100,000 net income with editable SE and income tax reserve rates shows separate self-employment and income-tax reserve amounts.

Key Features

  • Instant Calculation
  • Private & Secure
  • Mobile Optimized

Tips & Best Practices

  • Run a conservative scenario before making pricing decisions.
  • Use current payment processor or marketplace fee schedules when applicable.
  • Revisit assumptions when costs, volume, or tax rates change.

Frequently Asked Questions

Is this tax or legal advice?
No. This is a planning estimate. Enter your own rates and review the result with a qualified professional before making tax, legal, payroll, or entity decisions.
Is my business data stored?
No. The calculator runs locally in your browser and does not upload your inputs.