Korea Payroll & Tax API › card-income-deduction
South Korea credit card income deduction for year-end settlement: deduction from credit, debit/cash, traditional market/transit and culture spending above 25% of salary, with limits and estimated tax saved.
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.
| Field | Type | Required | Description |
|---|---|---|---|
grossSalary | number | yes | Annual gross salary (KRW) |
children | integer | Number of children (raises the limit) | |
creditCard | number | Credit card spending (KRW) | |
debitCash | number | Debit card and cash-receipt spending (KRW) | |
traditionalMarketTransit | number | Traditional market and public transport spending (KRW) | |
cultureSports | number | Books, performances, cinema, gym spending (KRW) |
curl -X POST https://api.kkuldogu.com/v1/card-income-deduction -H "content-type: application/json" \
-d '{"grossSalary":50000000,"creditCard":15000000,"debitCash":5000000,"traditionalMarketTransit":800000,"cultureSports":300000}'Without payment this returns 402 with x402 payment requirements; an x402 client pays $0.05 USDC and retries.
{
"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": "card-income-deduction",
"input": {
"grossSalary": 50000000,
"creditCard": 15000000,
"debitCash": 5000000,
"traditionalMarketTransit": 800000,
"cultureSports": 300000
},
"result": {
"deduction": 2285000,
"estimatedTaxSaving": 377025,
"minimumSpend": 12500000,
"totalSpend": 21100000,
"baseLimit": 3000000,
"extraLimitUsed": 0
}
}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