# Mart402 Japan Retirement Income Tax Calculator

> 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

## Facts

- Endpoint: POST https://mart402.com/v1/jp-retirement-tax?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mart402-japan-retirement-income-tax-calculator-49dddd19
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O8MZW_gahi-FScVvM2mgU

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mart402-japan-retirement-income-tax-calculator-49dddd19 -d '<json body>'
```

Example prompt: Calculate the retirement income tax for a Japanese employee receiving a ¥25,000,000 retirement payout after 32 years of service — include the deduction, withholding tax, and the resident tax split between the 6% and 4% portions.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "payout_yen": {
   "type": "number"
  },
  "years_of_service": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mart402-japan-retirement-income-tax-calculator-49dddd19/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mart402.com](https://www.zero.xyz/host/mart402.com/llms.txt)