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Mart402 Japan Retirement Income Tax Calculator
x402
Mart402 Japan Retirement Income Tax Calculator is a paid API for AI agents from mart402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-01).
Calculates Japan retirement income tax using official deduction schedules, short-term/officer exceptions, exact withholding rounding, and resident tax split
Price / call$0.02
Success—
StatusUnknown
How this service works
Japan retirement income tax: deduction by years of service, half-taxation with short-term/officer exceptions, exact withholding rounding (1-yen floor), resident tax 6+4 percent split. $0.02/call.
Output
Returns the computed retirement income deduction based on years of service, the taxable portion of the retirement payout (applying half-taxation and short-term/officer rules where applicable), the precise withholding income tax (rounded to the 1-yen floor), and the resident tax broken down into the 6% prefectural and 4% municipal components.
Example use cases
HR payroll system retirement payout
“Our employee is retiring after 28 years of service and will receive a ¥18,000,000 lump-sum retirement allowance — what are the exact income tax and resident tax amounts to withhold, including the 6 and 4 percent resident tax split?”
Short-tenure officer retirement tax check
“A company officer is leaving after only 4 years and getting a ¥8,500,000 retirement payout. What's the Japanese retirement income tax including the short-term officer exception and exact 1-yen floor rounding?”
Financial planning for retirement lump sum
“I'm about to retire from my Japanese employer after 40 years and will receive ¥35,000,000. How much income tax and resident tax will be deducted from my retirement allowance under Japan's NTA rules?”
Technical details
Endpoint
POSThttps://mart402.com/v1/jp-retirement-tax?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise, NTA-compliant Japan retirement income tax calculations including the correct deduction schedule by years of service, half-taxation rule, short-term and officer exceptions, and exact 1-yen floor withholding rounding with resident tax split — especially when building Japanese HR, payroll, or financial planning systems that must match official tax authority output.
Side effects
- Missing required fields (payout_yen or years_of_service) returns a 400 validation error
- Negative or zero years_of_service may return an error or degenerate deduction
- Extremely large payout_yen values may exceed expected ranges
- Non-numeric inputs result in schema validation failure
- Edge cases for exactly 5 or 20 years of service boundary thresholds may need careful review
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payout_yen | number | |
| years_of_service | number |
Tags
x402
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