# Self Employment Tax Calculator — REST API endpoint `self-employment-tax-calculator`

Return the yearly self-employment tax bill for the USA (SE tax: Social Security, Medicare, additional Medicare, plus federal income tax), Türkiye (Bağ-Kur premium plus income tax), or KKTC (social security plus income tax after the personal allowance), with taxable income, quarterly payment, effective rate, and net income after tax. Tax years 2024 and 2025.

- Category: finance
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/self-employment-tax-calculator/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/api/self-employment-tax-calculator/
- Same tool on the other surface: https://findutils.com/mcp/self-employment-tax-calculator/

## Call the endpoint (verified example)

```bash
curl -X POST https://api.findutils.com/api/tools/self-employment-tax-calculator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "country": "usa",
    "tax_year": "2025",
    "gross_income": 100000,
    "business_expenses": 20000,
    "filing_status": "single"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/self-employment-tax-calculator
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `country` | string (usa \| turkey \| kktc) | no | Tax system: usa, turkey, or kktc. Default: turkey. |
| `tax_year` | string (2024 \| 2025) | no | Tax year. Default: 2025. |
| `gross_income` | number | yes | Gross self-employment income for the year. |
| `business_expenses` | number | no | Deductible business expenses. Default: 0. |
| `filing_status` | string (single \| married_joint \| married_separate \| head_of_household) | no | USA only. Default: single. |
| `other_income` | number | no | USA only: other taxable income (W-2, interest). Default: 0. |
| `use_standard_deduction` | boolean | no | USA only: use the standard deduction. Default: true. |
| `itemized_deductions` | number | no | USA only: itemized deductions when not using the standard one; the larger of the two is applied. Default: 0. |
| `bagkur_tier` | string (minimum \| custom) | no | Türkiye only: minimum declared base, or custom. Default: minimum. |
| `bagkur_has_discount` | boolean | no | Türkiye only: 5-point discount for regular payers (29.5% instead of 34.5%). Default: true. |
| `custom_bagkur_base` | number | no | Türkiye only: monthly declared base when bagkur_tier is custom; clamped to the legal range. |

Example arguments (verified):

```json
{
  "country": "usa",
  "tax_year": "2025",
  "gross_income": 100000,
  "business_expenses": 20000,
  "filing_status": "single"
}
```

OpenAPI 3.1 spec: https://findutils.com/api/openapi.json · Interactive docs: https://findutils.com/api/docs/

## Also an MCP tool

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Then ask the client to call `findutils:self_employment_tax_calculator`. Full MCP reference: https://findutils.com/mcp/self-employment-tax-calculator/

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