How do I calculate self-employment tax on a Schedule C net profit?

Question

AcadiFi · Accepted Answer

Five steps.

1. Start with Schedule C net profit: 75,000 dollars.
2. Multiply by 0.9235 to get net earnings from self-employment: 75,000 times 0.9235 equals 69,262.50.
3. Apply the Social Security portion of 12.4 percent up to the wage base. For 2024 the wage base is 168,600 dollars. Since 69,262.50 is below the base, the full 12.4 percent applies: 69,262.50 times 0.124 equals 8,588.55.
4. Apply the Medicare portion of 2.9 percent with no cap: 69,262.50 times 0.029 equals 2,008.61.
5. Add the two for total SE tax: 8,588.55 plus 2,008.61 equals 10,597.16, which rounds to about 10,597 dollars.

```mermaid
flowchart TD
  A["Schedule C net 75,000"] --> B["x 0.9235 = 69,262.50"]
  B --> C["SS 12.4%: 8,588.55"]
  B --> D["Medicare 2.9%: 2,008.61"]
  C --> E["Total SE tax 10,597.16"]
  D --> E
  E --> F["Above-the-line deduction for half: 5,299"]
```

Additional Medicare of 0.9 percent kicks in above 200,000 single or 250,000 joint, but those thresholds are based on combined wages and net earnings.

Your client also gets an above-the-line deduction for half of the SE tax on Schedule 1, line 15, which adjusts the AGI. The most common mistake is computing the tax on the gross profit before the 0.9235 step, which overstates the tax by about 8.3 percent.

How do I calculate self-employment tax on a Schedule C net profit?

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