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Japan Social Insurance Premium Calculator (Kyokai-Kenpo FY2026)
x402
Japan Social Insurance Premium Calculator (Kyokai-Kenpo FY2026) is a paid API for AI agents from mart402.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).
Converts monthly remuneration to the official grade and computes health, nursing care, pension, and employment insurance premiums for all 47 Japanese prefectures using the FY2026 Kyokai-Kenpo table with official rounding.
Price / call$0.01
Success—
StatusUnknown
How this service works
Japan social insurance premiums: monthly remuneration to grade + health/care/pension/employment premiums from the official Kyokai-Kenpo FY2026 grade table, all 47 prefectures, official rounding. $0.01/call.
Output
Returns the employee's official Kyokai-Kenpo insurance grade determined from the monthly remuneration, plus itemized premium amounts (health insurance, nursing care insurance if age ≥ 40, welfare pension, and employment insurance), split into employee and employer shares, all computed with official rounding rules for the specified prefecture and FY2026 rate table.
Example use cases
Payroll deduction check for new hire
“We're onboarding a 35-year-old employee in Tokyo with a monthly salary of 320,000 yen — what will the health, pension, and employment insurance deductions be for FY2026?”
Nursing care premium for older employee
“Our employee is 62 years old, based in Aichi, and earns 450,000 yen per month. How much will the nursing care insurance premium be under the current Kyokai-Kenpo table?”
Employer cost planning across prefectures
“I'm comparing employer social insurance costs between Hokkaido and Kanagawa for a 40-year-old employee earning 500,000 yen a month — can you calculate the FY2026 premiums for both prefectures?”
Technical details
Endpoint
POSThttps://mart402.com/v1/jp-social-insurance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need accurate, official FY2026 Kyokai-Kenpo premium calculations for all 47 Japanese prefectures with correct grade mapping and rounding — especially for payroll auditing, HR onboarding cost estimation, or compliance checks. Prefer over manual lookups or generic payroll calculators that may not reflect current year rates or prefecture-specific health insurance variations.
Side effects
- Invalid or missing prefecture returns a 400 error
- Age outside valid range (e.g. negative) may cause a validation error
- Monthly remuneration below minimum or above maximum grade boundary may return boundary grade
- Missing required fields (age, prefecture, monthly_remuneration_yen) returns a 422 or 400 error
- Prefecture name must match expected format (English romaji or Japanese)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| age | number | |
| prefecture | string | |
| monthly_remuneration_yen | number |
Tags
x402
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