Korea Payroll & Tax API › gross-from-net

Reverse South Korea take-home pay

Reverse South Korea take-home pay: the gross monthly and annual salary needed to reach a target monthly net pay after 2026 social insurance and withheld income tax.

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	Required	Description
`targetNetMonthly`	number	yes	Desired monthly take-home pay (KRW)
`nonTaxable`	number		Monthly non-taxable allowances; default 200000 (KRW)
`dependents`	integer		Dependents including self; default 1
`children8to20`	integer		Children aged 8-20; default 0
`severanceIncluded`	boolean		Quote the annual salary with severance included (x13); default false

Example request

curl -X POST https://api.kkuldogu.com/v1/gross-from-net -H "content-type: application/json" \
  -d '{"targetNetMonthly":3000000}'

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": "gross-from-net",
  "input": {
    "targetNetMonthly": 3000000
  },
  "result": {
    "requiredAnnualSalary": 40956000,
    "grossMonthly": 3413000,
    "actualNetMonthly": 3000210,
    "socialInsurance": 312190,
    "incomeTaxAndLocal": 100600
  }
}

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