Jp Crypto Tax Rules

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io.github.kodandy/jp-crypto-tax-rulesv0.1.0

Machine-readable Japanese crypto-asset tax rules for AI agents: rules-as-code with citations, x402.

Crypto & Web3 Finance & Payments

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https://jp-crypto-tax-rules-62ko7b2uwa-an.a.run.app/mcp

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get_rule_pack

Scenario-curated bundle of full structured rules (statements, citations, parameters) for one use case: defi_staking | overseas_exchange | corporate_holding | transition_2028. Paid via x402: each call costs 0.05 USDC. This tool returns the HTTP 402 payment challenge (spec-conformant accepts list) for the pack resource. The 402 is real: settle it against /v1/packs/{scenario} with an X-PAYMENT header and the 200 response delivers the full pack body ({status:"settled", settlement, pack}) — payment buys the actual structured rules, not a receipt. Not tax advice. 一般的な税制情報の提供であり、個別の税務判断は税理士にご相談ください。

scenariostring, required

Scenario pack to retrieve: defi_staking | overseas_exchange | corporate_holding | transition_2028

This tool isn't marked read-only, so it may change something on the server or in an account you connected.

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Tools (4)

get_rule_pack

Argument	Type	Description
scenario*	string	Scenario pack to retrieve: defi_staking \| overseas_exchange \| corporate_holding \| transition_2028

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "scenario"
  ],
  "properties": {
    "scenario": {
      "enum": [
        "defi_staking",
        "overseas_exchange",
        "corporate_holding",
        "transition_2028"
      ],
      "type": "string",
      "description": "Scenario pack to retrieve: defi_staking | overseas_exchange | corporate_holding | transition_2028"
    }
  }
}

get_tax_parameters

FREE — returns structured tax parameters with per-value sources: progressive income tax brackets, resident tax and reconstruction surtax figures, the 2028-reform separate-taxation rate and loss-carryforward years, and the salary-filer filing threshold. Approximate reference values from public sources; not tax advice. 一般的な税制情報の提供であり、個別の税務判断は税理士にご相談ください。

Argument	Type	Description
tax_year	integer	Tax year for epoch annotation of pending-reform rules, e.g. 2026 or 2028

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "tax_year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 2000,
      "description": "Tax year for epoch annotation of pending-reform rules, e.g. 2026 or 2028"
    }
  }
}

get_tax_rule

FREE — returns one full structured rule: statement, exceptions, status, effective dates, machine tags and statutory citations (sources), served verbatim from the versioned rules corpus. Not tax advice. 一般的な税制情報の提供であり、個別の税務判断は税理士にご相談ください。

Argument	Type	Description
rule_id*	string	Rule id, e.g. jp.crypto.income.classification.individual

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "rule_id"
  ],
  "properties": {
    "rule_id": {
      "type": "string",
      "description": "Rule id, e.g. jp.crypto.income.classification.individual"
    }
  }
}

list_tax_rules

FREE — returns structured rules. Catalog of machine-readable Japanese crypto-asset tax rules (rules-as-code): titles, status (current / enacted_pending), effective dates and statutory citations, filterable by category, taxpayer and tax_year. tax_year resolves the current-vs-2028-reform epoch per rule (applies / pending_enforcement). Sources are public only (NTA FAQ, e-Gov statutes, MOF documents); not tax advice. 一般的な税制情報の提供であり、個別の税務判断は税理士にご相談ください。

Argument	Type	Description
category	string	Category filter: corporate \| cost_basis \| filing \| income_classification \| reform_2028 \| taxable_events
tax_year	integer	Tax year to resolve rule applicability, e.g. 2026 or 2028
taxpayer	string	Taxpayer filter: all \| corporate \| individual

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "category": {
      "type": "string",
      "description": "Category filter: corporate | cost_basis | filing | income_classification | reform_2028 | taxable_events"
    },
    "tax_year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 2000,
      "description": "Tax year to resolve rule applicability, e.g. 2026 or 2028"
    },
    "taxpayer": {
      "type": "string",
      "description": "Taxpayer filter: all | corporate | individual"
    }
  }
}