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Mart402 Japan Net Salary Calculator
x402
Mart402 Japan Net Salary 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).
Converts annual gross salary to Japanese take-home pay by computing social insurance premiums, income tax (with reconstruction surtax), and resident tax using official NTA and Kyokai-Kenpo FY2026 tables
Price / call$0.02
Success—
StatusUnknown
How this service works
Japan net salary calculator for AI agents: annual gross to take-home pay (social insurance + income tax incl. reconstruction surtax + resident tax with adjustment credit). Exact NTA Beppyo-5 table, official Kyokai-Kenpo FY2026 rates, cited primary sources, deterministic. $0.02/call.
Output
Returns a structured JSON breakdown of the employee's annual and monthly net take-home pay, itemized social insurance premiums (health, pension, employment), income tax with reconstruction surtax computed via NTA Beppyo-5 table, resident tax with adjustment credit applied using official Kyokai-Kenpo FY2026 rates, and total deductions — all deterministic and traceable to cited primary sources.
Example use cases
Offer letter net pay estimate
“I'm about to accept a job offer in Japan with an annual gross of ¥9,000,000 and a ¥1,500,000 bonus. I'm 29 and would be living in Kanagawa — what would my actual monthly take-home pay look like after all taxes and social insurance?”
HR payroll modeling for new hire
“We're onboarding a 42-year-old employee in Osaka with an annual gross of ¥6,800,000 and no bonus. Can you compute their expected net salary so we can put accurate numbers in the employment contract?”
Relocation financial planning
“I'm considering relocating to Japan and want to know how much I'd actually take home. My gross would be ¥12,000,000 per year with a ¥2,000,000 annual bonus, I'm 38 years old, and I'd be based in Aichi prefecture.”
Technical details
Endpoint
POSThttps://mart402.com/v1/jp-payroll-net?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, auditable Japan-specific net salary computation grounded in official government tables (NTA Beppyo-5, Kyokai-Kenpo FY2026) rather than approximations. Prefer it over generic tax calculators when accuracy for Japanese social insurance tiers, reconstruction surtax, and prefecture-level resident tax with adjustment credit is required. Ideal for HR tools, offer-letter generators, relocation planning agents, and payroll auditing workflows.
Side effects
- Missing required annual_gross_yen field returns a 400 validation error
- Invalid prefecture string not matching a Japanese prefecture returns an error
- Age outside valid range for social insurance calculations may return an error or note
- Malformed request body returns 400 bad request
- Network timeout returns 5xx and should be retried
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| age | number | |
| prefecture | string | |
| annual_bonus_yen | number | |
| annual_gross_yen | number |
Tags
x402
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