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Worked example

Self-Employment Tax Example for a Freelance Designer

Rina, a fictional freelance designer, expects $108,000 of business receipts, $28,000 of deductible business expenses, and $45,000 of Social Security-covered W-2 wages. She is building a cash reserve for the payroll-tax component of freelance profit. This is an illustrative 2026 scenario, not personal tax advice.

8 minute read · 2026 U.S. federal tax

Follow the numbers

Apply the net-earnings factor

Net business profit becoming adjusted self-employment earnings and then splitting into Social Security and Medicare tax components.
  1. 1Determine net profit
  2. 2Apply the net-earnings factor
  3. 3Split Social Security and Medicare
Apply the net-earnings factor is the editorial focus of this worked example.
Visual summary: Net business profit becoming adjusted self-employment earnings and then splitting into Social Security and Medicare tax components. This page highlights: Apply the net-earnings factor.

The planning question behind the numbers

Rina, a fictional freelance designer, expects $108,000 of business receipts, $28,000 of deductible business expenses, and $45,000 of Social Security-covered W-2 wages.

She is building a cash reserve for the payroll-tax component of freelance profit. The filing-status context is Filing status is not an input to this calculator, and every tax value uses the 2026 production calculation.

Scenario profile

She is building a cash reserve for the payroll-tax component of freelance profit.

Rina, a fictional freelance designer, expects $108,000 of business receipts, $28,000 of deductible business expenses, and $45,000 of Social Security-covered W-2 wages.

Filing status is not an input to this calculator

Prepared inputs, grouped by role

Business records

  • $108,000 gross self-employment income
  • $28,000 deductible business expenses

Tax context

  • 2026 tax year
  • $45,000 Social Security wages
  • income-and-expenses method
A fictional planning profile keeps the calculation concrete without implying personal advice.
Visual summary: Rina, a fictional freelance designer, expects $108,000 of business receipts, $28,000 of deductible business expenses, and $45,000 of Social Security-covered W-2 wages. Filing-status context: Filing status is not an input to this calculator. Inputs: 2026 tax year; $108,000 gross self-employment income; $28,000 deductible business expenses; $45,000 Social Security wages; income-and-expenses method.

Inputs the fictional taxpayer has prepared

The scenario uses the same inputs accepted by the calculator. No deduction, credit, basis amount, or eligibility conclusion is created inside the example.

  • 2026 tax year
  • $108,000 gross self-employment income
  • $28,000 deductible business expenses
  • $45,000 Social Security wages
  • income-and-expenses method

Follow the calculation from input to result

TaxArith passes the fixture through calculateSelfEmploymentTax. The values below use the site’s production formatting.

Production calculation journey

Values are generated by calculateSelfEmploymentTax.

calculateSelfEmploymentTax

  1. 1. Net profit$80,000.00
  2. 2. Adjusted net earnings$73,880.00
  3. 3. Social Security tax$9,161.12
  4. 4. Medicare tax$2,142.52
  5. 5. Deductible employer-equivalent portion$5,651.82
  6. 6. Estimated self-employment tax$11,303.64
Covered wages use part of the Social Security wage base, but Medicare tax continues on the modeled self-employment earnings.
Visual summary: Net profit: 80000; Adjusted net earnings: 73880; Social Security tax: 9161.12; Medicare tax: 2142.52; Deductible employer-equivalent portion: 5651.820000000001; Estimated self-employment tax: 11303.640000000001

Covered wages use part of the Social Security wage base, but Medicare tax continues on the modeled self-employment earnings.

Change one input and watch the consequence

If supported business expenses rise to $38,000 while receipts stay fixed:

Base case versus one changed input

If supported business expenses rise to $38,000 while receipts stay fixed

Base case

Estimated self-employment tax

$11,303.64

One-input change

Alternative self-employment tax

$9,890.69
Numeric change−$1,412.96

If supported business expenses rise to $38,000 while receipts stay fixed

Only expenses that are genuinely deductible belong in the input; the scenario shows sensitivity, not a recommendation to create spending.
Visual summary: Estimated self-employment tax: 11303.640000000001. Alternative self-employment tax: 9890.685.

Only expenses that are genuinely deductible belong in the input; the scenario shows sensitivity, not a recommendation to create spending.

Before you use the estimate

  • Recreate the example only with records that support your own inputs.
  • Keep the same filing status and tax year when comparing the published numbers.
  • Change one material input at a time and read the full breakdown.
  • Review the stated limitations before using the estimate.

Where this estimate stops

  • This is self-employment tax only. It omits federal income tax, Additional Medicare Tax, quarterly-payment requirements, and business-deduction eligibility.
  • The fictional facts illustrate production logic and do not establish eligibility, filing treatment, or a recommended action for any reader.

Sources and references

Only the primary federal sources used for the rules discussed in this guide are listed here.

  • Self-employment tax: Social Security and Medicare taxes

    Internal Revenue Service · The general net-earnings, Social Security, Medicare, and deductible-half framework.

  • 2026 Schedule SE

    Internal Revenue Service · Draft—verify the final version before filing. The 2026 Schedule SE structure and year-specific amounts reflected in the project model; this document was draft when reviewed.

TaxArith provides illustrative 2026 U.S. federal tax estimates for general information. It is not tax, legal, financial, or investment advice and does not prepare or file a return. Results depend on the accuracy and completeness of the submitted facts.