Korea Payroll & Tax API › net-pay

South Korea take-home pay for an employee

South Korea take-home pay for an employee: monthly net salary after national pension, health and long-term care insurance, employment insurance, and withheld income tax (2026 NTS simplified withholding table) plus local income tax.

Price: $0.01 USDC per call over REST (x402 on Base, no API key). MCP: free as net_pay at https://api.kkuldogu.com/mcp. Basis year: 2026.

Input

Field	Type	Description
`annualSalary`	number	Gross annual salary (KRW)
`monthlySalary`	number	Gross monthly salary; overrides annualSalary (KRW)
`nonTaxable`	number	Monthly non-taxable allowances, e.g. meal allowance; default 200000 (KRW)
`dependents`	integer	Dependents for withholding, including self; default 1
`children8to20`	integer	Children aged 8-20 among dependents; default 0
`severanceIncluded`	boolean	Annual salary includes severance (divided by 13); default false

Example request

curl -X POST https://api.kkuldogu.com/v1/net-pay -H "content-type: application/json" \
  -d '{"annualSalary":50000000,"dependents":2,"children8to20":1}'

Without payment this returns 402 with x402 payment requirements; an x402 client pays $0.01 USDC and retries.

Example response

{
  "basisYear": 2026,
  "currency": "KRW",
  "disclaimer": "For reference only, not legal or tax advice. Uses official 2026 Korean rates and the same formulas as the kkuldogu.com calculators; actual payroll, NHIS/NPS notices and tax settlement can differ.",
  "source": "https://kkuldogu.com",
  "tool": "net-pay",
  "input": {
    "annualSalary": 50000000,
    "dependents": 2,
    "children8to20": 1
  },
  "result": {
    "grossMonthly": 4166666,
    "taxableMonthly": 3966666,
    "netMonthly": 3625276,
    "netAnnual12": 43503312,
    "totalDeductions": 541390,
    "deductions": {
      "nationalPension": 188380,
      "healthInsurance": 142600,
      "longTermCare": 18730,
      "employmentInsurance": 35690,
      "incomeTax": 141810,
      "localIncomeTax": 14180
    }
  }
}

For reference only, not legal or tax advice. Uses official 2026 Korean rates and the same formulas as the kkuldogu.com calculators; actual payroll, NHIS/NPS notices and tax settlement can differ. · Calculators for people (Korean): kkuldogu.com · API home · llms.txt · OpenAPI