Korea Payroll & Tax API › job-offer-comparison

Compare a South Korean job offer with the current job on what actually matters

Compare a South Korean job offer with the current job on what actually matters: annual take-home pay including bonus (after 2026 social insurance and withholding tax), monthly take-home, and real hourly net pay once commuting time is counted. Assumes KRW 200,000 monthly non-taxable pay and 1 dependent.

Price: $0.05 USDC per call over REST (x402 on Base, no API key). MCP: paid-only — the MCP tool returns payment instructions. Basis year: 2026.

Input

Example request

curl -X POST https://api.kkuldogu.com/v1/job-offer-comparison -H "content-type: application/json" \
  -d '{"current":{"annualSalary":42000000,"annualBonus":2000000,"commuteMinutesPerDay":60},"offer":{"annualSalary":46000000,"commuteMinutesPerDay":100}}'

Without payment this returns 402 with x402 payment requirements; an x402 client pays $0.05 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": "job-offer-comparison",
  "input": {
    "current": {
      "annualSalary": 42000000,
      "annualBonus": 2000000,
      "commuteMinutesPerDay": 60
    },
    "offer": {
      "annualSalary": 46000000,
      "commuteMinutesPerDay": 100
    }
  },
  "result": {
    "annualNetDifference": 1547360,
    "salaryIncreasePct": 9.5,
    "realHourlyNetDifference": -513,
    "current": {
      "monthlyNetExcludingBonus": 3066300,
      "annualNetIncludingBonus": 38343440,
      "workAndCommuteHoursPerYear": 2346,
      "realHourlyNet": 16341
    },
    "offer": {
      "monthlyNetExcludingBonus": 3324243,
      "annualNetIncludingBonus": 39890800,
      "workAndCommuteHoursPerYear": 2520,
      "realHourlyNet": 15828
    }
  }
}

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