For approximately 3.8 million foreign nationals residing in Japan (end of 2024) and Japanese nationals holding overseas assets, international inheritance is a complex area involving multiple legal systems and tax regimes. This article addresses practical issues facing foreign residents, international couples, and Japanese with overseas assets.
Framework: Determining Applicable Law
Article 36 of the Act on General Rules for Application of Laws
Japan's private international law (Act on General Rules for Application of Laws, Article 36) provides that inheritance is governed by the deceased's national law — a "unified principle" approach.
| Deceased's nationality | Applicable law |
|---|---|
| Japanese | Japanese law |
| Single foreign nationality | National law of that country |
| Dual nationality (including Japanese) | Japanese law |
| Dual nationality (excluding Japanese) | Habitual residence law or closest-connection law |
| Stateless | Habitual residence law |
Renvoi Issues
Foreign law may designate Japanese law as the applicable law — known as renvoi. Japan's Act on General Rules Article 41 recognizes renvoi, frequently causing Japanese law to apply circularly.
Typical case: A US national resident in Japan with Japan-located real estate and bank accounts: - Japanese law view: US law applies (Art. 36, deceased's national law) - US (common law) view: movables = domicile (Japan) law, real estate = lex situs (Japan) law - → Renvoi causes Japanese law to apply
Conflict with Split Principle (Common Law)
Unified vs. Split Principle
| Principle | Adopting countries | Mechanism |
|---|---|---|
| Unified | Japan, Germany, France, Switzerland | Single law governs all assets |
| Split | Common law (UK, US, Australia, Canada), China | Movables = domicile law; real estate = lex situs |
Practical Conflict Patterns
Case 1: UK husband × Japanese wife, residing in Japan, UK real estate, Japan bank accounts - Japan view: UK law applies overall → UK view: real estate = UK law, movables = Japan law (habitual residence) - Renvoi triggered → Japanese law (bank) + UK law (real estate) operate in parallel
Case 2: US permanent residents × US national couple, residing in Japan, all assets in Japan - Japan view: US law applies → US view: movables = Japan law, real estate = Japan law → renvoi means all Japanese law - Separate US Probate proceedings may still be required if US assets exist
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Scope of International Inheritance Tax
Japanese inheritance tax law operates independently from civil applicable law, determining tax scope by the parties' status.
| Category | Deceased | Heir | Taxable scope |
|---|---|---|---|
| Resident unlimited taxpayer | Japan resident | Japan resident | Worldwide assets |
| Non-resident unlimited taxpayer | Japan residence history / special permanent residents | Japan residence history etc. | Worldwide assets |
| Limited taxpayer | Non-resident | Non-resident | Japan-located assets only |
Issues Specific to Foreign Residents
Permanent residents and Special Permanent Residents are typically "resident unlimited taxpayers," meaning worldwide assets are subject to Japanese inheritance tax (foreign tax credit available).
Mid-to-long-term residents (work visa, etc.) who have resided in Japan for 10 years or less may exclude overseas assets from Japanese inheritance tax — the "10-year residency rule" introduced in the 2017 reform.
Practical Procedures
Japan-Located Asset Processing
Regardless of the deceased's nationality, disposition of Japan-located real estate, bank accounts, and securities requires Japanese procedures.
| Asset | Required documents |
|---|---|
| Real estate | Inheritance registration (Legal Affairs Bureau), certified heir-determination documents per deceased's national law (Apostille/consular authentication) |
| Bank accounts | Bank inheritance procedures (death certificate, heir-determination documents, estate division agreement) |
| Listed shares | Brokerage inheritance procedures (similar) |
Proof of foreign law typically requires a "Certificate of Applicable Law" or legal-heir certificate from the relevant embassy — documentation often takes 2-6 months.
Relationship with Probate
Japan has no probate system — heirs directly conduct inheritance procedures. For deceased nationals of the US, UK, Australia, etc., probate proceeds in the home country while Japanese assets can be directly inherited — parallel proceedings in both jurisdictions.
International Wills
Applicable Law for Will Formalities
Japan adopts the Act on the Law Applicable to the Form of Wills (1962, Hague Convention based). A will is valid in Japan if it satisfies any of:
- Law of place of execution
- Testator's national law
- Testator's domicile law
- Testator's habitual residence law
- (For real estate) Lex situs
Self-Written vs. Notarized Will — International Validity
Notarized wills offer formal clarity and are more readily recognized abroad after translation and authentication. Self-written wills, while valid if formalities are met, may require additional procedures for foreign authority recognition.
Case Studies
Case 1: Korean Special Permanent Resident's Inheritance
Deceased: Korean special permanent resident (3rd generation in Japan), 60 years Japan residence, Japan real estate and bank accounts, modest assets at Korean koseki location.
- Applicable law: Korean Civil Code (Art. 36, deceased's national law)
- Korean inheritance rules: Surviving spouse 1.5 + child 1.0 ratio (differs from Japanese Civil Code)
- Procedure: Korean family relation certificate, Korean Civil Code based heir certificate → Japan real estate registration and bank closures
- Tax: Resident unlimited taxpayer, worldwide assets taxed
Case 2: US Expatriate's Accidental Death
Deceased: US national, work visa, 5 years Japan stationed, Japan bank account, primary assets in US.
- Applicable law: US law (deceased's national law — state law applies, e.g., NY)
- US side: US court probate proceedings (Executor appointment, debt settlement, distribution)
- Japan side: Japan bank account closed via US Executor authenticated documents
- Tax: Limited taxpayer (Japan residence 10 years or less excludes overseas assets); only Japan-located assets subject to Japanese tax
Case 3: International Couple's Succession
Deceased: Japanese husband, UK national wife, jointly-owned UK real estate, Japan-based husband's account, dual-national child.
- Husband (Japanese) death: Japanese law applies (Art. 36), but UK real estate also requires UK probate (split principle)
- Solution approach: Prepare a will valid under both UK and Japanese law (notarized international will), or use lifetime gift/trust to circumvent
When Lawyer Involvement is Essential
Deceased Side (Lifetime Planning)
- Will preparation: Internationally valid notarized will, executor designation
- Lifetime gifts/trusts: International inheritance tax optimization, family trust utilization
- Nationality/domicile choice: Naturalization, permanent residency, long-term residency impact assessment
Heir Side (Post-Death Response)
- Applicable law determination: Art. 36 + renvoi analysis, proof of foreign applicable law
- Heir determination under foreign law: Equivalent of family register documents, authentication (Apostille/consular)
- International inheritance tax filing: Double taxation avoidance (foreign tax credit), filing deadline management (10 months from death)
- Overseas asset processing: Coordination with local lawyers/legal scriveners, probate management
Conclusion
International inheritance involves intersecting civil law + tax law + procedural law across Japan and foreign jurisdictions. With ~3.8 million foreign residents and increasing case volume year over year, this is a growing practice area.
Immediate steps (foreign residents): - Prepare a notarized will (validity verified under both Japanese and home country law) - List of assets in both home country and Japan - Pre-prepare heir-determination documents (home country family register equivalent) - Confirm Japanese inheritance tax taxpayer classification
For international inheritance, wills, and inheritance tax matters, consult a lawyer experienced in international inheritance practice (ideally English/home language capable).
