Korea Payroll & Tax API › retirement-income-tax

South Korea retirement income tax on a severance payment

South Korea retirement income tax on a severance payment: service-year deduction, converted-pay deduction, national and local tax, and the reduced tax if received as an IRP pension.

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

Input

Example request

curl -X POST https://api.kkuldogu.com/v1/retirement-income-tax -H "content-type: application/json" \
  -d '{"severancePay":30000000,"startDate":"2018-03-02","lastWorkDate":"2026-10-31"}'

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": "retirement-income-tax",
  "input": {
    "severancePay": 30000000,
    "startDate": "2018-03-02",
    "lastWorkDate": "2026-10-31"
  },
  "result": {
    "severancePay": 30000000,
    "taxableServiceYears": 9,
    "retirementIncomeTax": 264000,
    "localIncomeTax": 26400,
    "totalTax": 290400,
    "netSeverance": 29709600,
    "effectiveRatePct": 1,
    "taxIfPaidAsIrpPension10y": 203280,
    "breakdown": {
      "serviceYearDeduction": 13000000,
      "convertedPay": 22666666.666666668,
      "convertedPayDeduction": 16800000,
      "taxBase": 5866666.666666668,
      "convertedTax": 352000.00000000006
    }
  }
}

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