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Mart402 Japan Bonus Net Pay Calculator
x402
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.
Price / call$0.01
Success—
StatusUnknown
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.
Example use cases
Employee bonus take-home estimate
“My company is paying me a ¥800,000 bonus and I'm based in Osaka. My take-home salary last month after social insurance was ¥320,000. What will my net bonus actually be after all the deductions?”
Payroll agent bonus slip generation
“I need to generate a net pay figure for our employee's ¥350,000 bonus — she's in Kanagawa prefecture and her previous month's post-social-insurance salary was ¥245,000. What does she take home?”
Bonus negotiation net impact check
“My employer offered me a ¥1,200,000 bonus and I live in Aichi. Last month I took home ¥410,000 after social insurance. How much of that bonus will actually land in my bank account?”
Technical details
Endpoint
POSThttps://mart402.com/v1/jp-bonus-net?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| bonus_yen | number | |
| prefecture | string | |
| previous_month_after_si_yen | number |
Tags
x402
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