# Mart402 Japan Net Salary Calculator

> 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

## Facts

- Endpoint: POST https://mart402.com/v1/jp-payroll-net?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-net-salary-calculator-538f6b6b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WMZXWiUPs46jcRbDS57To

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-net-salary-calculator-538f6b6b -d '<json body>'
```

Example prompt: What's my estimated take-home pay if my annual gross salary is ¥7,500,000 with a ¥1,200,000 bonus, I'm 34 years old, and I live in Tokyo?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "age": {
   "type": "number"
  },
  "prefecture": {
   "type": "string"
  },
  "annual_bonus_yen": {
   "type": "number"
  },
  "annual_gross_yen": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mart402-japan-net-salary-calculator-538f6b6b/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)