Korea Payroll & Tax API › vehicle-tax

South Korea annual vehicle tax (jadongchase) for a private passenger car

South Korea annual vehicle tax (jadongchase) for a private passenger car: per-cc rate by engine displacement, 30% local education tax, age reduction from the 3rd year (5% a year, up to 50%), flat amount for electric cars, and the 2026 annual-prepayment discount.

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

Field	Type	Description
`displacementCc`	number	Engine displacement in cc; not needed for electric
`vehicleAgeYears`	integer	Vehicle age counted from first registration, 1 = first year; default 1
`electric`	boolean	Battery electric car (flat 100,000 plus education tax); default false
`prepayMonth`	0 \| 1 \| 3 \| 6 \| 9	Month of annual prepayment (1, 3, 6 or 9) for the 5% discount on the remaining period; 0 = no prepayment (default)

Example request

curl -X POST https://api.kkuldogu.com/v1/vehicle-tax -H "content-type: application/json" \
  -d '{"displacementCc":1998,"vehicleAgeYears":5,"prepayMonth":1}'

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, tax or financial advice. Computed from South Korean statutes and standard formulas as of 2026; reliefs, exemptions and special cases not shown in the result are not modeled, and rules may have changed. Confirm with the relevant office, court, lender or a professional before acting.",
  "source": "https://kkuldogu.com",
  "tool": "vehicle-tax",
  "input": {
    "displacementCc": 1998,
    "vehicleAgeYears": 5,
    "prepayMonth": 1
  },
  "result": {
    "annualTotal": 441550,
    "vehicleTax": 339660,
    "localEducationTax": 101890,
    "perCcRate": 200,
    "ageReductionPct": 15,
    "perHalfYear": 220770,
    "prepayDiscount": 20200,
    "annualTotalAfterPrepay": 421350
  }
}

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