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jp-crypto-tax-rules

io.github.kodandy/jp-crypto-tax-rules
Crypto & Web3 Legal & Compliance Public & reachable MCP 2025-11-25

What this MCP does

Provides structured, cited Japanese crypto-asset tax rules, parameters, effective dates, and scenario-specific rule packs.

Capabilities

Tools

4 tools
get_rule_pack
Curated scenario rule pack (x402 metered)
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。
Input schema 
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['scenario'], 'properties': {'scenario': {'enum': ['defi_staking', 'overseas_exchange', 'corporate_holding', 'transition_2028'], 'type': 'string', 'description': 'Scenario pack to retrieve: defi_staking | overseas_exchange | corporate_holding | transition_2028'}}}
get_tax_parameters
Japanese tax parameters (brackets, rates, thresholds)
FREE — returns structured tax parameters with per-value sources: progressive income tax brackets, resident tax and reconstruction surtax figures, the 2028-reform separate-taxation rate and loss-carryforward years, and the salary-filer filing threshold. Approximate reference values from public sources; not tax advice. 一般的な税制情報の提供であり、個別の税務判断は税理士にご相談ください。
Input schema 
{'type': 'object', '$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
Full structured rule record (rule_id lookup)
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。
Input schema 
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['rule_id'], 'properties': {'rule_id': {'type': 'string', 'description': 'Rule id, e.g. jp.crypto.income.classification.individual'}}}
list_tax_rules
List structured Japanese crypto tax rules
FREE — returns structured rules. Catalog of machine-readable Japanese crypto-asset tax rules (rules-as-code): titles, status (current / enacted_pending), effective dates and statutory citations, filterable by category, taxpayer and tax_year. tax_year resolves the current-vs-2028-reform epoch per rule (applies / pending_enforcement). Sources are public only (NTA FAQ, e-Gov statutes, MOF documents); not tax advice. 一般的な税制情報の提供であり、個別の税務判断は税理士にご相談ください。
Input schema 
{'type': 'object', '$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'}}}
History

Recent tool changes

Added
get_rule_pack
Sept. 17, 2026, 12:42 p.m.
Added
get_tax_parameters
Sept. 17, 2026, 12:42 p.m.
Added
get_tax_rule
Sept. 17, 2026, 12:42 p.m.
Added
list_tax_rules
Sept. 17, 2026, 12:42 p.m.
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