Korea Payroll & Tax API › income-tax-from-tax-base

South Korea comprehensive income tax from a tax base (gwase pyojun)

South Korea comprehensive income tax from a tax base (gwase pyojun): the 8-bracket 6-45% progressive table with deduction amounts, plus 10% local income tax, marginal and effective rates.

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

Input

Example request

curl -X POST https://api.kkuldogu.com/v1/income-tax-from-tax-base -H "content-type: application/json" \
  -d '{"taxBase":50000000}'

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, 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": "income-tax-from-tax-base",
  "input": {
    "taxBase": 50000000
  },
  "result": {
    "incomeTax": 6240000,
    "localIncomeTax": 624000,
    "total": 6864000,
    "marginalRatePct": 15,
    "effectiveRatePct": 13.7
  }
}

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