Self-Employment Tax Calculator
Estimate your Social Security and Medicare self-employment tax from your net business profit.
How the calculation works
Only 92.35% of your net profit counts as net earnings subject to self-employment tax, a built-in adjustment mirroring how an employer's share of payroll tax isn't taxed for W-2 employees. That amount is then taxed 12.4% for Social Security (capped at the annual wage base, $184,500 for 2026) plus 2.9% for Medicare (no cap), plus an extra 0.9% Additional Medicare Tax on net earnings above your filing status's threshold. Half of the total self-employment tax is deductible from your income tax, which this shows separately.
Formula
Net Earnings = Net Profit × 92.35%. Self-Employment Tax = min(Net Earnings, Social Security Wage Base) × 12.4% + Net Earnings × 2.9% + max(0, Net Earnings − Additional Medicare Tax threshold) × 0.9%.
Examples
$80,000 net profit, single
$11,303.64 self-employment tax ($5,651.82 deductible)
$200,000 net profit, single (above the Social Security wage base)
$28,234.30 self-employment tax ($14,117.15 deductible)
$300,000 net profit, single (above the Additional Medicare Tax threshold)
$31,605.90 self-employment tax, including $693.45 Additional Medicare Tax ($15,802.95 deductible)