Korea Payroll & Tax API › rent-increase-limit

South Korea legal cap on rent increases at renewal

South Korea legal cap on rent increases at renewal: 5% for housing leases, and 5% for commercial leases whose converted deposit (deposit + monthly rent x 100) is within the regional threshold (Seoul 900M, overconcentration areas and Busan 690M, other metropolitan cities 540M, elsewhere 370M).

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

Input

Example request

curl -X POST https://api.kkuldogu.com/v1/rent-increase-limit -H "content-type: application/json" \
  -d '{"type":"commercial","deposit":100000000,"monthlyRent":3000000,"region":"seoul"}'

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": "rent-increase-limit",
  "input": {
    "type": "commercial",
    "deposit": 100000000,
    "monthlyRent": 3000000,
    "region": "seoul"
  },
  "result": {
    "capApplies": true,
    "capPct": 5,
    "convertedDeposit": 400000000,
    "regionThreshold": 900000000,
    "maxDeposit": 105000000,
    "maxMonthlyRent": 3150000,
    "maxDepositIncrease": 5000000,
    "maxMonthlyRentIncrease": 150000
  }
}

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