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Mart402 Japan Consumption Tax Calculator
x402
Mart402 Japan Consumption Tax 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).
Computes Japan consumption tax with per-rate invoice rounding, qualified invoice (T+13) field validation, simplified taxation, and the 20% special rule for taxable periods overlapping 2023-10-01 through 2026-09-30
Price / call$0.01
Success—
StatusUnknown
How this service works
Japan consumption tax: per-rate invoice rounding (one rounding per rate), qualified invoice (T+13) field validation, simplified taxation, 20-percent special (taxable periods that include a day 2023-10-01..2026-09-30). $0.01/call.
Output
Returns computed Japan consumption tax amounts with per-rate rounding applied (one rounding per rate), qualified invoice (T+13) field validation results, simplified taxation figures where applicable, and an indicator of whether the 20% special rule applies for taxable periods overlapping October 1 2023 through September 30 2026.
Example use cases
Qualified invoice tax compliance check
“I'm issuing a Japanese qualified invoice (registered number T+13) for taxable sales of ¥3,200,000 excluding tax, for the period October 1 2023 to September 30 2024. Can you compute the consumption tax with per-rate rounding and validate the qualified invoice fields?”
Simplified taxation for small business
“We're a small Japanese business using the simplified taxation method. Our taxable period is April 1 2024 to March 31 2025, and taxable sales excluding tax are ¥45,000,000 yen. Can you calculate our consumption tax liability?”
20% special rule period check
“My company's taxable period runs from July 1 2025 to June 30 2026 — does the 20-percent special JCT rule apply? Please calculate our consumption tax for taxable sales of ¥8,750,000 excluding tax.”
Technical details
Endpoint
POSThttps://mart402.com/v1/jp-consumption-tax?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need Japan-specific consumption tax computation that handles the complexity of the 2023 qualified invoice system (invoice registration number T+13), per-rate rounding rules required by the new invoice regime, simplified taxation method for eligible small businesses, and the transitional 20% special rule for periods touching October 2023 to September 2026. Prefer this over generic tax or accounting APIs that lack Japan JCT-specific rounding and qualified invoice validation logic.
Side effects
- Invalid or missing taxable_period_start or taxable_period_end dates returns a validation error
- Negative or non-numeric taxable_sales_excl_yen causes a schema validation failure
- Unknown or unsupported mode value returns an error indicating valid modes
- Taxable period entirely outside the special-rule window returns result without 20% special rule fields
- Malformed request body returns HTTP 400 with field-level error details
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mode | string | |
| taxable_period_end | string | |
| taxable_period_start | string | |
| taxable_sales_excl_yen | number |
Tags
x402
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