Self-employment tax (SECA) is the Social Security and Medicare bill when there is no W-2 employer splitting FICA. IRS Topic 554: 15.3% on 92.35% of net earnings. 12.4% Social Security up to the $184,500 2026 OASDI base. 2.9% Medicare with no cap.
The page default is already written: $50,000 → $7,064.78. The leftover most $60,000 Schedule C years need is the same formula on this profit.
On $60,000 net earnings:
- Taxable base = $60,000 × 92.35% = $55,410
- Social Security = 12.4% × $55,410 = $6,870.84
- Medicare = 2.9% × $55,410 = $1,606.89
- SECA total = $8,477.73
That is not income tax. The stacked take-home leftover (SECA plus Form 1040) lives on self-employment take-home vs W-2. QBI does not cut this line: $80,000 SECA is $11,303.64.
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Hub: United States calculators.
This engine stops at Topic 554. It does not subtract the half-SE-tax adjustment on Form 1040, add the 0.9% Additional Medicare Tax, or withhold income tax. Quarterly 1040-ES is a payment calendar, not this total. Estimate, not tax advice.
Direct answer: $60,000 → $8,477.73
- Taxable base = $60,000 × 0.9235 = $55,410
- Social Security = $55,410 × 0.124 = $6,870.84
- Medicare = $55,410 × 0.029 = $1,606.89
- Total = $8,477.73
- $50,000 leftover = $7,064.78. $80,000 leftover = $11,303.64
taxableBase = 92.35% × netEarnings
socialSecurity = 12.4% × min(taxableBase, $184,500)
medicare = 2.9% × taxableBase
totalSECA = socialSecurity + medicare
Three leftover profits, same formula
| Net earnings | Taxable base | Social Security | Medicare | SECA |
|---|---|---|---|---|
| $50,000 | $46,175 | $5,725.70 | $1,339.08 | $7,064.78 |
| $60,000 | $55,410 | $6,870.84 | $1,606.89 | $8,477.73 |
| $80,000 | $73,880 | $9,161.12 | $2,142.52 | $11,303.64 |
All three sit under the $184,500 Social Security base, so nothing here is Medicare-only. The 12.4% still applies to the full taxable base.
What this is not
- Employee FICA. A W-2 on $60,000 shows 7.65% on the stub. The other 7.65% is the employer half. SECA is both halves on 92.35%. FICA on a $2,000 check.
- The 0.9% Additional Medicare line. That statute needs wages (or SE income) over a filing-status threshold. Joint $400,000 → $1,350.
- A raise vs a $50,000 year. $8,477.73 is the tax on $60,000, not a rate change.
It is the SECA piece on $60,000 net. Quarterly estimates also cover income tax. Safe-harbor leftover: prior-year tax $10,000 → $1,000 a quarter.
No. Section 199A cuts taxable income for income tax. It does not cut SECA. The $80,000 leftover still pays $11,303.64.
The half-SE-tax adjustment is an income-tax deduction. It does not shrink this $8,477.73 SECA total. This engine leaves that line off.