{
  "name": "Japan",
  "id": "https://openinherit.org/v3/extensions/japan.json",
  "version": "1.0.0",
  "inherit": ">=3.0.0 <4.0.0",
  "maturity": "candidate",
  "extensionType": "geographic",
  "applicableJurisdictions": [
    "JP"
  ],
  "providesOwnProcedure": false,
  "compatibleWith": [],
  "legalSystems": [
    "civil_law"
  ],
  "maintainers": [
    {
      "name": "Testate Technologies",
      "organisation": "Testate Technologies Ltd",
      "role": "lead"
    }
  ],
  "lastVerified": "2026-03-26",
  "dataProvenance": "Japanese Civil Code (民法), Family Register Act (戸籍法), 2019 spousal residence right reform",
  "responsibleOrganisation": "Testate Technologies Ltd",
  "description": "Koseki records, iryubun claims, yōshi adoption, spousal residence right, isan bunkatsu, saishi succession, local will formalities.",
  "conformanceRules": [
    {
      "id": "jp-001",
      "code": "INHERIT_COMPLETENESS_FIELD_MISSING",
      "description": "Koseki (family register) record is recommended for Japanese estates",
      "check": "exists",
      "path": "x-inherit-japan.kosekiRecord",
      "severity": "warning"
    }
  ],
  "certifiedBy": "OpenInherit",
  "certificationDate": "2026-04-04",
  "successionCoverage": "comprehensive",
  "taxCoverage": "partial",
  "keyFeatures": "Forced heirship (iryubun), family court mediation, inheritance tax brackets, agricultural succession, relationshipCategory on IryubunClaim (spouse/child/lineal_ascendant/sibling), yoshi adoption → core kinship type mapping (futsu_yoshi/tokubetsu_yoshi), saishi custodial succession clarification",
  "legalTradition": "Civil law",
  "seeking": "",
  "tier": "core"
}