Self-Employment Tax Calculator

ANA›Life Services Authority›National Calculator Authority›Self-Employment Tax Calculator

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Self-Employment Tax Calculator

Estimate your self-employment (SE) tax liability and the deductible portion you can claim on your federal income tax return.

Net Self-Employment Income ($)

W-2 Wages / Other SS-Covered Income ($) (optional)

Calculate

### Results

Net SE Income SE Income Subject to Tax (92.35%) Social Security Wage Base Used Social Security Tax (12.4%) Medicare Tax (2.9%) Additional Medicare Tax (0.9%) Total SE Tax Deductible Portion (50% of SE Tax) Effective SE Tax Rate

function selFmt(n) { return '$' + n.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ','); } function selCalc() { var errEl = document.getElementById('sel-error'); var resEl = document.getElementById('sel-result'); errEl.style.display = 'none'; resEl.style.display = 'none';

var netIncome = parseFloat(document.getElementById('sel-net-income').value); var otherWages = parseFloat(document.getElementById('sel-other-wages').value) || 0;

// --- Validation --- if (isNaN(netIncome) || document.getElementById('sel-net-income').value.trim() === '') { errEl.textContent = 'Please enter your net self-employment income.'; errEl.style.display = 'block'; return; } if (netIncome 10000000) { errEl.textContent = 'Please enter a realistic income value (under $10,000,000).'; errEl.style.display = 'block'; return; }

// --- Constants (2024 tax year) --- var SS_WAGE_BASE = 168600; // Social Security wage base 2024 var SE_FACTOR = 0.9235; // 92.35% — net earnings multiplier (1 - 0.0765) var SS_RATE = 0.124; // 12.4% Social Security rate var MED_RATE = 0.029; // 2.9% Medicare rate var ADD_MED_RATE = 0.009; // 0.9% Additional Medicare Tax var ADD_MED_THRESH = 200000; // Additional Medicare threshold (single filer)

// --- Step 1: Net earnings subject to SE tax --- var seEarnings = netIncome * SE_FACTOR;

// --- Step 2: Social Security tax (capped at wage base) --- // Reduce available SS wage base by any W-2 wages already subject to SS var ssWageBaseRemaining = Math.max(0, SS_WAGE_BASE - otherWages); var ssEarnings = Math.min(seEarnings, ssWageBaseRemaining); var ssTax = ssEarnings * SS_RATE;

// --- Step 3: Medicare tax (no cap) --- var medTax = seEarnings * MED_RATE;

// --- Step 4: Additional Medicare Tax (0.9%) on combined income > $200,000 --- // Combined = SE earnings + other wages; tax applies to amount over threshold var combinedIncome = seEarnings + otherWages; var addMedTaxable = Math.max(0, combinedIncome - ADD_MED_THRESH); // Only the SE portion of the excess is taxed here (simplified Schedule SE approach) var sePortionOfExcess = Math.min(addMedTaxable, seEarnings); var addMedTax = sePortionOfExcess * ADD_MED_RATE;

// --- Step 5: Total SE tax --- var totalSETax = ssTax + medTax + addMedTax;

// --- Step 6: Deductible portion (50% of total SE tax) --- var deductiblePortion = totalSETax * 0.5;

// --- Step 7: Effective rate on net income --- var effectiveRate = netIncome > 0 ? (totalSETax / netIncome) * 100 : 0;

// --- Display --- document.getElementById('sel-r-net').textContent = selFmt(netIncome); document.getElementById('sel-r-subject').textContent = selFmt(seEarnings); document.getElementById('sel-r-ss-base').textContent = selFmt(ssEarnings); document.getElementById('sel-r-ss-tax').textContent = selFmt(ssTax); document.getElementById('sel-r-med-tax').textContent = selFmt(medTax); document.getElementById('sel-r-add-med').textContent = selFmt(addMedTax); document.getElementById('sel-r-total').textContent = selFmt(totalSETax); document.getElementById('sel-r-deduct').textContent = selFmt(deductiblePortion); document.getElementById('sel-r-rate').textContent = effectiveRate.toFixed(2) + '%';

resEl.style.display = 'block'; }

#### Formulas Used (IRS Schedule SE, 2024)

1. Net SE Earnings: SE Earnings = Net Income × 0.9235

2. Social Security Tax: SS Taxable = min(SE Earnings, max(0, $168,600 − W-2 Wages)) SS Tax = SS Taxable × 12.4%

3. Medicare Tax: Medicare Tax = SE Earnings × 2.9%

4. Additional Medicare Tax (if applicable): Combined Income = SE Earnings + W-2 Wages Add. Medicare Tax = max(0, Combined Income − $200,000) × 0.9%

5. Total SE Tax: Total SE Tax = SS Tax + Medicare Tax + Additional Medicare Tax

6. Deductible Portion: Deduction = Total SE Tax × 50%

7. Effective Rate: Effective Rate = Total SE Tax ÷ Net Income × 100

#### Assumptions & References

Based on 2024 tax year figures (IRS Schedule SE).
The 92.35% factor (1 − 7.65%) accounts for the employer-equivalent deduction before computing SE earnings — per IRS Publication 334.
Social Security wage base for 2024 is $168,600 (IRS Rev. Proc. 2023-34). Income above this cap is not subject to the 12.4% SS tax.
Medicare tax (2.9%) applies to all SE earnings with no cap.
Additional Medicare Tax (0.9%) applies to combined wages and SE income exceeding $200,000 (single) / $250,000 (married filing jointly) — this calculator uses the single-filer threshold. See IRS Form 8959.
The 50% deductible portion of SE tax is deducted on Schedule 1 (Form 1040), Line 15, reducing adjusted gross income.
References: IRS Schedule SE, IRS Publication 334, IRS Publication 505, IRC §1401, IRC §1402.

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