# Mart402 Japan Bonus Net Pay Calculator

> Mart402 Japan Bonus Net Pay Calculator is a paid API for AI agents from mart402.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Calculates net take-home pay for a Japanese bonus after deducting social insurance premiums and withholding tax using official bonus rate tables, given the previous month's post-SI salary.

## Facts

- Endpoint: POST https://mart402.com/v1/jp-bonus-net?utm_source=zero.xyz
- Price: $0.01/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-bonus-net-pay-calculator-f5c8ff6d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i9jTU7S3QkfKaEb5ilPf9

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-bonus-net-pay-calculator-f5c8ff6d -d '<json body>'
```

Example prompt: I'm getting a ¥500,000 bonus this month in Tokyo — my previous month's salary after social insurance was ¥280,000. Can you work out how much I'll actually take home after social insurance premiums and withholding tax?

## When to prefer this

Use this endpoint when you need a deterministic, officially-sourced Japanese bonus net pay calculation for any prefecture. Prefer it over general payroll APIs when you specifically need Japanese bonus tax rules (not monthly salary), and over LLM-based estimates when you need exact, citable figures derived from official statutory tables.

## Known failure modes

- Missing required field bonus_yen or previous_month_after_si_yen returns validation error
- Invalid or unrecognized prefecture string may cause lookup failure or fallback to default rate
- Non-positive or zero bonus amount may return an error or zero-deduction result
- Very large bonus amounts near edge cases of the rate table may produce unexpected bracket results
- Network timeout or service unavailability returns HTTP 5xx

## How this service works

Japan bonus net pay: social insurance premiums and withholding tax from the official bonus rate table (needs previous-month salary). Deterministic, cited sources. $0.01/call.

## Output

Returns a deterministic breakdown of the bonus net pay: gross bonus, social insurance premium deductions (health insurance, pension, employment insurance), withholding tax computed from the official Japanese bonus rate table, and final net take-home amount — all in yen, with cited regulatory sources.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "bonus_yen": {
   "type": "number"
  },
  "prefecture": {
   "type": "string"
  },
  "previous_month_after_si_yen": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mart402-japan-bonus-net-pay-calculator-f5c8ff6d/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)