Self Employment Tax Calculator API

POST https://api.findutils.com/api/tools/self-employment-tax-calculator/execute

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.

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Request body

application/json

country

string optional

Tax system: usa, turkey, or kktc. Default: turkey. One of usa · turkey · kktc.
tax_year

string optional

Tax year. Default: 2025. One of 2024 · 2025.
gross_income

number required

Gross self-employment income for the year.
business_expenses

number optional

Deductible business expenses. Default: 0.
filing_status

string optional

USA only. Default: single. One of single · married_joint · married_separate · head_of_household.
other_income

number optional

USA only: other taxable income (W-2, interest). Default: 0.
use_standard_deduction

boolean optional

USA only: use the standard deduction. Default: true.
itemized_deductions

number optional

USA only: itemized deductions when not using the standard one; the larger of the two is applied. Default: 0.
bagkur_tier

string optional

Türkiye only: minimum declared base, or custom. Default: minimum. One of minimum · custom.
bagkur_has_discount

boolean optional

Türkiye only: 5-point discount for regular payers (29.5% instead of 34.5%). Default: true.
custom_bagkur_base

number optional

Türkiye only: monthly declared base when bagkur_tier is custom; clamped to the legal range.

Example arguments

Verified

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

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"
  }'

const response = await fetch('https://api.findutils.com/api/tools/self-employment-tax-calculator/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"country":"usa","tax_year":"2025","gross_income":100000,"business_expenses":20000,"filing_status":"single"}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/self-employment-tax-calculator/execute",
    json={"country":"usa","tax_year":"2025","gross_income":100000,"business_expenses":20000,"filing_status":"single"},
)
data = response.json()

$ch = curl_init('https://api.findutils.com/api/tools/self-employment-tax-calculator/execute');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS => '{"country":"usa","tax_year":"2025","gross_income":100000,"business_expenses":20000,"filing_status":"single"}',
    CURLOPT_RETURNTRANSFER => true,
]);
$data = json_decode(curl_exec($ch), true);

Also an MCP tool

Call self_employment_tax_calculator from Claude, Cursor or any MCP client. Same arguments, same output.

https://mcp.findutils.com

MCP reference

Rate limit: 60 a minute, per IP
Auth: None
REST id: self-employment-tax-calculator
MCP name: self_employment_tax_calculator
Category: Finance
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

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