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The Complete Guide to Inheritance Disputes & Succession in Japan for Expats – Process, Taxes, Wills & Interpreter Support 2026–2027

By Makoto Matsuo – Founder, Osaka Language Solutions

If you’re an expat in Japan — or planning to move here long-term — the thought of inheritance, succession, or a family dispute over assets can feel daunting. What happens to property in Japan when someone passes away? How does Japanese inheritance tax work for foreigners with global assets? What if there’s no will, or a will from your home country? And what happens if heirs disagree — especially when some live abroad and don’t speak Japanese?

These are real, high-stakes questions, and the answers are often more complicated than people expect because of Japan’s unique mix of historical traditions (koseki system, ie legacy), modern tax rules (high progressive rates, 10-year tail), and procedural requirements (mandatory registration, mediation-first).

As someone born and raised in Osaka, I’ve helped many expats in Kansai navigate inheritance matters — from simple property transfers after a parent’s death to complex cross-border disputes involving Japanese real estate, overseas accounts, and blended families. I’ve seen the stress of tight deadlines (3 months to renounce, 10 months for tax filing), the confusion over koseki documents, and the relief that comes when accurate interpretation and clear guidance are in place.

This guide is my complete, transparent resource for understanding inheritance disputes and succession in Japan in 2026–2027 — especially for expats. We’ll cover the historical evolution of Japanese succession law, statutory shares & forced heirship, governing law & conflict of laws, will types & validity, procedural steps (from death to distribution), taxation (including the 10-year rule), dispute resolution (mediation & adjudication), and why professional interpreter support is often essential for being heard and achieving fair outcomes.

Japan’s system is strict, protective of close relatives, and increasingly digital — but with preparation and the right support, you can manage assets, minimize tax exposure, and resolve disputes efficiently.

Let’s start with the historical genesis and evolutionary trajectory of Japanese succession law — it explains why koseki still matters, why forced heirship (iryūbun) exists, and how the system shifted from patriarchal household transfer to modern individual rights.

Historical Genesis and the Evolutionary Trajectory of Japanese Succession Law

Inheritance and succession in Japan are not just legal procedures — they carry deep historical weight that still shapes how assets are distributed, taxes are calculated, and disputes are resolved in 2026–2027. For expats, this history explains why the koseki (family registry) system remains central, why forced heirship (iryūbun) protects close relatives so strongly, and why foreign wills or assets often trigger complex cross-border rules.

As someone born and raised in Osaka, I’ve seen how these historical layers affect real families in Kansai — from simple property transfers after a parent’s passing to heated disputes when foreign heirs and Japanese assets collide. The system is strict and protective, but with understanding and the right interpreter support, you can navigate it without unnecessary stress or cost.

Here’s the clear historical progression — from feudal customs to the modern individual-focused framework — so you can see why Japanese succession law works the way it does today.

Pre-Meiji & Feudal Era (Before 1868): Localized Customs & Household Authority

Before the Meiji Restoration, inheritance was governed by local customs and social class (samurai, farmers, merchants). There was no unified national law:

• Samurai families often practiced primogeniture — eldest son inherited headship (katoku sōzoku) and all property to preserve lineage and military duty.
• Farmers/artisans: More flexible — land divided among children or passed to adopted heirs if no sons.
• Merchants: Wealth often split equally or used for business continuity.

The koseki (family register) originated in the 7th–8th century Ritsuryō codes for taxation and conscription, but it was not yet a national succession tool. No forced heirship existed — the household head had wide discretion.

Meiji Era (1868–1945): Centralization & the Ie System

The Meiji government needed a modern, unified state to renegotiate unequal treaties. They imported French/German civil law but adapted it to Japanese values.

Key developments:

• 1872: Nationwide koseki system formalized — every family registered under one head.
• 1898 Meiji Civil Code: Codified the ie (household) system.
  • Household head (koshu) controlled inheritance, marriage, residence.
  • Primogeniture dominant — eldest son inherited headship and most property.
  • Women/younger children had minimal rights.
  • Succession focused on transferring household authority, not individual wealth.

This era blended Western civil law with Confucian hierarchy — creating a system where family continuity trumped individual rights.

Post-War Revolution (1945–1948): From Household to Individual

After WWII, the Allied Occupation forced democratization. The 1947 Constitution (Article 24) guaranteed gender equality and individual dignity, abolishing the ie system’s legal force.

1948 Civil Code revision (still the foundation in 2026):

• Nuclear family model: Spouses + unmarried children.
• Equal inheritance rights for all children (regardless of gender/birth order).
• Surviving spouse always inherits alongside other heirs.
• Forced heirship (iryūbun) introduced — certain relatives cannot be fully disinherited.
• Universal succession: Heirs automatically inherit all rights/debts at death.

This shift transformed inheritance from patriarchal household transfer to equitable distribution of individual wealth.

Late 20th–Early 21st Century: Modern Adjustments

• 2013: Eliminated discrimination against illegitimate children (previously half-share).
• 2020: Holograph will storage system at Legal Affairs Bureau — simplifies probate.
• 2024: Mandatory inheritance registration for real estate (to solve “owner-unknown” land crisis).
• 2026–2027: Ongoing digital reforms (e-registration, My Number linkage) + joint custody implications for minor heirs.

Why This History Still Matters for Expats in 2026–2027

• Koseki legacy: Japanese heirs use koseki to prove lineage — expats must provide equivalent foreign documents (birth/marriage/death certificates + apostille/translation).
• Forced heirship (iryūbun): Close relatives (spouse, children, parents) have reserved shares — you cannot fully disinherit them even with a will.
• Universal succession: Heirs inherit debts too — careful renunciation (within 3 months) needed if liabilities exceed assets.
• Cross-border complexity: Japanese law for real estate in Japan; national law for movables (often) — creates “scission” issues.

Reassurance from Osaka Japan’s succession law has evolved from rigid household control to a balanced, individual-focused system that protects close family while allowing testamentary freedom. It is strict — especially on tax and registration deadlines — but predictable and fair. With proper wills, accurate translations, and interpreter support for mediation or tax filings, expats can plan effectively and resolve disputes without unnecessary conflict or cost.

The next section covers the architecture of statutory inheritance — heir ranks, spouse’s share, forced heirship (iryūbun), and how the system excludes or includes different relatives.

The Architecture of Statutory Inheritance and the Hierarchy of Heirs

Once someone passes away in Japan, the inheritance process begins automatically — there is no need for a court to “grant” probate in the same way as in many common-law countries. This is called universal succession: at the moment of death, all rights, assets, and liabilities pass directly to the heirs by operation of law. The Japanese Civil Code then provides a clear, rigid framework for determining who inherits what when there is no will (intestate succession) — and it protects certain close relatives through forced heirship (iryūbun) even when a will exists.

For expats, this structure can feel unfamiliar and restrictive compared to systems that allow complete testamentary freedom. Understanding the hierarchy of heirs, spouse’s share, statutory portions, and reserved rights is essential — especially if you have assets in Japan, blended families, or heirs living abroad.

Here’s the practical breakdown of how statutory inheritance works in 2026–2027 — including who is included/excluded, how shares are calculated, and why interpreter support is often critical during mediation or family discussions.

1. The Basic Principle: Universal Succession & Automatic Transfer

• At the exact moment of death, heirs immediately and automatically inherit all rights and duties attached to the estate — assets (real estate, bank accounts, stocks), debts, liabilities.
• No court order is required for the transfer itself (unlike probate in the US/UK).
• Heirs can later renounce (sōzoku hōki) or accept with reservation (gentei shōnin) within 3 months if debts exceed assets.
• If no action is taken, acceptance is presumed.

Expats note: This means foreign heirs automatically inherit Japanese real estate — but they must register the transfer (mandatory since 2024) to avoid fines.

2. Hierarchy of Statutory Heirs (When No Will Exists)

The Civil Code ranks heirs in order of priority. Higher ranks exclude lower ones entirely.

Heir Ranking & Shares (2026–2027)

Key definitions:

• Children: Includes biological, legally adopted, and affiliated (non-marital but legally recognized by father).
• Per stirpes substitution: If a child predeceases the decedent, their descendants (grandchildren) inherit their share. This applies in Rank 1 and (limited) Rank 3.
• Spouse: Always included alongside other ranks — never excluded unless they renounce.

Expats note: If all heirs are foreign and live abroad, the process still requires Japanese documentation (koseki equivalents + apostille/translation) — interpreter support is essential for coordinating with Japanese banks/Legal Affairs Bureau.

3. Forced Heirship – The Legally Reserved Portion (Iryūbun)

Even with a valid will, certain close relatives cannot be completely disinherited. They have a reserved portion (iryūbun) — a minimum guaranteed share they can claim if the will or lifetime gifts infringe on their rights.

Reserved Portions (2026–2027)

How it works:

• Claim must be made within 1 year of learning about the inheritance and the infringement.
• Since 2013 reforms, iryūbun claims are usually settled in cash (not specific assets), avoiding fragmented property ownership.
• Siblings have no protection — they can be fully excluded by will.

Expats note: If you have Japanese heirs (spouse, children), you cannot disinherit them completely — even with a foreign will. Interpreter support is crucial when explaining this to family or during mediation.

4. Practical Implications for Expats

• No will: Statutory shares apply automatically — spouse and children usually split 50/50.
• With will: You can adjust shares, but cannot reduce reserved heirs below iryūbun minimum.
• Debts: Heirs inherit liabilities — renunciation within 3 months protects against negative estates.
• Cross-border: Japanese law governs real estate in Japan; national law often governs movables (scission effect) — creates dual-system complexity.

Reassurance from Osaka The hierarchy and forced heirship rules are strict — but they are clear and protective of close family, which aligns with Japan’s cultural emphasis on family welfare. For expats, the main challenges are documentation (koseki equivalents, translations) and deadlines (3 months renunciation, 10 months tax filing). With accurate interpretation during family discussions or mediation, and early planning (notarized will, choice-of-law clause), you can ensure your wishes are respected while minimizing conflict and tax exposure.

The next section covers conflict of laws and the expat paradigm — which country’s law governs, renvoi/boomerang effects, and how to use Article 37 to choose Japanese law for simplicity.

Conflict of Laws and the Expat Paradigm

One of the most confusing — and potentially costly — aspects of inheritance and succession in Japan for expats is figuring out which country’s law actually governs the estate. This is not a minor detail: the wrong assumption can mean your will is partially invalid, your heirs face double taxation, real estate in Japan gets frozen for months, or a foreign judgment is ignored by Japanese banks and the Legal Affairs Bureau.

In 2026–2027, Japan’s conflict-of-laws rules (private international law) are clear and codified — but they interact in ways that often surprise foreigners accustomed to more flexible systems. The key statute is the Act on General Rules for Application of Laws (Hōrei, Act No. 78 of 2006, as amended), especially Article 36.

As someone who has helped many expats in Kansai coordinate cross-border inheritance (Japanese property + overseas accounts, foreign wills + Japanese heirs), I can tell you: early understanding of these rules + accurate interpretation during family discussions or tax filings prevents most problems.

Here’s the practical breakdown of how conflict of laws works for expats — which law applies, the renvoi/boomerang effect, how to choose Japanese law via Article 37, and why interpreter support is often essential when dealing with multiple legal systems.

1. Default Rule: Article 36 – National Law of the Decedent

Core principle: “Succession is governed by the national law of the decedent at the time of death.”

• If the deceased is a Japanese national: Japanese law governs the entire estate (worldwide assets).
• If the deceased is a foreign national: The law of their country of citizenship applies (in theory).

This sounds simple — but it quickly becomes complicated because of scission (splitting) in many foreign systems.

2. The Renvoi & Scission Boomerang Effect

Most common-law countries (US states, UK, Canada, Australia) use scission for inheritance:

• Movable property (bank accounts, stocks, cash): Governed by law of the decedent’s domicile at death.
• Immovable property (real estate): Governed by the law of the place where the property is situated (lex rei sitae).

How this creates the “boomerang” in Japan:

• Article 36 points to foreign national law (e.g., US state law).
• That state law says: “Real estate in Japan is governed by Japanese law.”
• Result: Japanese law “boomerangs” back and applies to Japanese real estate anyway.

Real expat examples (Kansai 2026):

• American citizen domiciled in Osaka dies owning Tokyo apartment + US bank account:
  • US law (scission) → Japanese law for apartment → Japanese Civil Code applies.
  • US law for bank account → US state law applies.
• British citizen with habitual residence in Japan dies:
  • UK law often refers immovable property back to Japan → Japanese law for Japanese real estate.

Interpreter role: Essential when coordinating with foreign lawyers or explaining boomerang effects to Japanese banks/Legal Affairs Bureau — prevents misunderstandings about which law controls what.

3. Article 37 – Choice of Japanese Law (The Expat Escape Valve)

Foreign nationals with habitual residence in Japan can proactively choose Japanese law to govern their entire succession — overriding the default national-law rule.

How to do it:

• Make the choice explicitly in a will.
• Example clause (translated): 「私は日本に常居所を有する外国人であるため、私の相続については日本法を準拠法として選択する。」 (Translation: “As a foreign national habitually resident in Japan, I hereby choose Japanese law as the governing law for my succession.”)

Benefits for expats:

• Unifies the estate under one law — no scission/boomerang confusion.
• Simplifies registration, tax filing, and distribution in Japan.
• Japanese banks and Legal Affairs Bureau process everything faster and with less documentation.

When to use Article 37:

• You have significant Japanese assets (real estate, bank accounts).
• You have heirs in Japan or plan to leave assets here.
• You want to avoid proving foreign law to Japanese authorities (costly, time-consuming).

Interpreter role: Critical when drafting/reviewing the choice-of-law clause — ensures accurate translation and cultural/legal understanding.

4. Multiple Nationalities & Habitual Residence Rules

Multiple nationalities:

• If one nationality is Japanese → Japanese law always governs (priority rule).
• If multiple foreign nationalities → Law of the country of habitual residence applies.
• If no clear habitual residence → Law of the country with closest connection (birth, long-term residence, family ties).

Habitual residence (jūsho):

• Not just visa status — actual center of life (family, work, home).
• Courts look at length of stay, intent to remain, family ties.

Expats note: Long-term residents (10+ years) are often deemed habitually resident in Japan — triggering Japanese law even without Article 37 choice.

Reassurance from Osaka Conflict of laws sounds intimidating — but Japan’s rules are predictable and increasingly expat-friendly. The boomerang effect protects Japanese assets under familiar law. Article 37 gives you the power to unify everything under Japanese rules if that simplifies things. With a properly drafted will (notarized preferred), accurate translations, and interpreter support for cross-border coordination, you can avoid most traps and ensure your estate is handled smoothly.

The next section covers testamentary dispositions — types of wills in Japan, formal requirements, validity under the Hague Convention, and the 2020 holograph storage system.

Testamentary Dispositions: Wills in Japan

Making a will in Japan is one of the most powerful ways for expats to ensure your wishes are respected after death — especially when you have assets in Japan, heirs abroad, or a blended family. Japan’s rules are flexible, practical, and surprisingly expat-friendly — thanks to the Hague Convention on the Form of Wills (1961), which Japan has ratified.

As someone born and raised in Osaka who has helped many expats in Kansai draft and register wills, I can tell you: a properly made will simplifies succession, minimizes tax exposure, and avoids disputes. Without one, statutory inheritance (50/50 split to spouse/children) applies automatically — which may not match your intentions.

Here’s the complete, up-to-date guide to testamentary dispositions (wills) in Japan for 2026–2027 — types, formal requirements, validity, the 2020 storage system, and why interpreter support is often essential when drafting or registering.

1. Types of Wills Recognized in Japan

Japan’s Civil Code recognizes three ordinary will types — each with different formalities, security, and convenience levels.

Holograph Will (Jihitsu Shōsho – Handwritten Will)

• Requirements: Entirely handwritten (no typing or stamps), dated (year/month/day), signed, and sealed with your registered inkan (personal seal).
• Advantages: Simple, no witnesses or notary needed, completely private.
• Disadvantages: Must be submitted to Family Court for probate (ken’in) after death — time-consuming (months), requires all heirs’ notification.
  • Risk of loss, forgery, or formal errors (e.g., missing date).
• 2020 Storage System: You can voluntarily store it at Legal Affairs Bureau for ¥3,900 — exempt from probate if properly registered.
  • Foreign-language holograph wills must be accompanied by Japanese translation when stored.

Notarized Will (Kōsei Shōsho – Notarial Will)

• Requirements: Dictated to a notary public in presence of two witnesses. Notary drafts official document, reads it aloud, all sign/seal.
• Advantages: Highest security — stored at Notary Office and Ministry of Justice. No probate needed — immediately executable after death.
• Disadvantages: Requires notary appointment and witnesses (cost ¥40,000–¥100,000).
• Best for expats: Most recommended — especially for complex estates or cross-border heirs.

Sealed Notarized Will (Himitsu Shōsho – Secret Notarial Will)

• Requirements: You sign/seal the document, place in envelope, seal it, present to notary + two witnesses who stamp envelope (contents remain secret).
• Advantages: Contents private until death. No probate needed.
• Disadvantages: Formal errors inside envelope can invalidate it. Less common.

2. Validity of Wills Under the Hague Convention

Japan is a signatory to the Hague Convention on the Form of Wills (1961) — giving expats flexibility.

A will is valid as to form if it complies with any one of:

• Law of the place where made
• Law of your nationality (at making or death)
• Law of your domicile or habitual residence (at making or death)
• Law of the place where real estate is situated (for that property)

Practical implication for expats:

• You can make a will in your home country under your national law — it will be recognized in Japan if it meets Hague form requirements.
• Or make a Japanese will under Japanese law for simplicity (especially if you have Japanese real estate).

Tip: Notarized will under Japanese law is safest for Japanese assets — no need to prove foreign law to banks/Legal Affairs Bureau.

3. Choosing Japanese Law via Article 37 (Optional but Powerful)

Foreign nationals with habitual residence in Japan can explicitly choose Japanese law for their entire succession (Article 37).

• Must be stated in the will.
• Unifies estate under Japanese rules — avoids scission/boomerang confusion.
• Simplifies registration, tax filing, and distribution in Japan.

Example clause (translated): 「私は日本に常居所を有する外国人であるため、私の相続については日本法を準拠法として選択する。」 (As a foreign national habitually resident in Japan, I choose Japanese law to govern my succession.)

Interpreter role: Essential when drafting/reviewing choice-of-law clause — ensures accurate translation and legal understanding.

4. Practical Tips for Expats Making a Will in Japan

1. Choose the right type:
   • Notarized (kōsei shōsho): Most secure and recommended for expats.
   • Holograph + storage: Cheaper but riskier without storage.
2. Include key provisions:
   • Executor (shiyūnin) — appoint trusted person (Japanese resident preferred).
   • Choice of law (Article 37 if desired).
   • Guardianship for minor children if applicable.
3. Handle cross-border assets:
   • Japanese law for Japanese real estate.
   • Home-country law for movables (if no Article 37 choice).
   • Coordinate with lawyer in home country.
4. Costs & timelines
   • Notarized will: ¥40,000–¥100,000 (notary + witnesses).
   • Holograph storage: ¥3,900.
   • Certified translation: ¥5,000–¥15,000 per page.

Interpreter role: Critical when drafting/reviewing with notary or lawyer — ensures your wishes are accurately reflected and culturally appropriate.

Reassurance from Osaka Making a will in Japan is simpler than most expats think — especially with the Hague Convention and Article 37 options. A notarized will under Japanese law is the safest choice for Japanese assets — it bypasses probate and simplifies everything for your heirs. With accurate translation and interpreter support, you can ensure your intentions are clear and respected, giving your family peace of mind.

The next (and final) section covers the procedural lifecycle from death to asset distribution — deadlines, registration requirements, tax filing, and how to prepare your heirs.

The Procedural Lifecycle: From Death to Distribution

The moment someone passes away in Japan, inheritance begins automatically — there is no need for a court to “open” the estate or appoint an executor in the same way as in many common-law systems. This universal succession principle means heirs immediately inherit all rights, assets, and liabilities. From that point, a strict procedural lifecycle unfolds with tight deadlines, mandatory registrations, tax filings, and — if heirs disagree — mediation-first resolution in Family Court.

For expats, this process can feel overwhelming because of language barriers, cross-border documentation, the koseki system, and the 2024–2027 mandatory registration rules. But it is predictable, and with preparation (especially a notarized will and accurate translations), most estates are distributed smoothly.

Here’s the complete step-by-step lifecycle — from death to final distribution — including key deadlines, required actions, tax obligations, and how interpreter support makes everything clearer and faster in 2026–2027.

1. Immediate Post-Death Actions (First 7–14 Days)

Key steps:

• Obtain death certificate (shibō todoke) from hospital/doctor → submit to municipal office within 7 days for koseki update.
• Locate will (if any) — check safety deposit box, notary office, or Legal Affairs Bureau (if stored since 2020).
• Notify financial institutions — freeze bank accounts to prevent unauthorized access.
• Secure property — change locks if needed, arrange insurance continuation.

Expats note: If the deceased was foreign, provide equivalent foreign death certificate + certified Japanese translation + apostille.

Interpreter role: Helpful when dealing with municipal office or banks — ensures accurate submission and communication.

2. Heir Identification & Renunciation Period (First 3 Months)

Identify all heirs:

• Use koseki records (Japanese nationals) or equivalent foreign documents (birth/marriage/death certificates + apostille/translation).
• Banks/Legal Affairs Bureau require proof of heirship.

Renunciation or qualified acceptance:

• Heirs have 3 months from knowing about inheritance to:
  • Renounce (sōzoku hōki) — if debts exceed assets.
  • Accept with reservation (gentei shōnin) — limit liability to inherited assets.
• If no action → full acceptance presumed.

Expats note: Foreign heirs often need interpreter support to understand deadlines and consequences — missing the 3-month window can expose you to unlimited debt liability.

3. Mandatory Inheritance Registration (Real Estate – 2024–2027 Deadlines)

Since April 1, 2024, heirs must register inherited real estate ownership.

Deadlines:

• New inheritances (after April 1, 2024): Within 3 years of knowing about inheritance.
• Pre-2024 inheritances: Catch-up deadline March 31, 2027.
• Fines for non-compliance: Up to ¥100,000.

Process:

• Shihō-shoshi (judicial scrivener) usually handles.
• Submit to Legal Affairs Bureau (Homukyoku).
• “Declaration-by-heir” option allows one heir to register even if others disagree.

Expats note: Foreign heirs need certified translations of foreign documents. Interpreter helps coordinate with shihō-shoshi and bureau.

4. Inheritance Tax Filing & Payment (Within 10 Months)

Who files: Heirs (individually or jointly). Deadline: 10 months from death — strict, extensions rare. Tax office: Local tax office where deceased resided (e.g., Izumiotsu Tax Office in Osaka).

Calculation basics:

• Aggregate estate value → subtract debts/funeral costs → subtract basic exemption (¥30M + ¥6M per heir).
• Apply progressive rates (10%–55%).
• Spousal credit: Often reduces spouse’s tax to zero (up to ¥160M or statutory share).

Expats note: Worldwide assets taxed if decedent/heir is long-term resident (10+ years in last 15). Interpreter essential for tax office meetings and return filing.

5. Division of Assets (If Heirs Disagree – Mediation-First)

No agreement → File Petition for Conciliation in Family Court (mandatory mediation).

• Mediation committee (judge + two mediators) facilitates agreement.
• Success rate ~50–60%.
• If agreed → Chōtei Chōsho (mediation record) issued — binding, used for registration/transfers.
• If failed → Adjudication (judge decides) or litigation (rare).

Expats note: Interpreter mandatory for mediation — ensures your position is accurately conveyed, especially on cross-border assets or cultural differences.

6. Final Distribution & Closing

• Bank accounts: Present chōtei chōsho or adjudication order + proof of heirship.
• Real estate: Register transfer at Legal Affairs Bureau (shihō-shoshi).
• Stocks/investments: Transfer via broker with court documents.
• Debts: Paid from estate before distribution.

Reassurance from Osaka The lifecycle is strict — but it’s logical and protective. Deadlines (3 months renunciation, 10 months tax, 3 years registration) are firm, but manageable with early planning. A notarized will + Article 37 choice of Japanese law + certified translations dramatically simplifies everything. With professional interpreter support during mediation, tax filings, or bank interactions, foreign heirs can be fully heard and protected — ensuring fair, timely distribution.

If you’re in Kansai (Osaka or nearby) and dealing with inheritance, succession planning, or a dispute — reach out.

Schedule your free LRAF consultation — 30–45 minutes to review your situation, explain deadlines and requirements in your language, and match you with a Kansai-fluent interpreter experienced in inheritance mediation, tax filings, and document translation.

You don’t have to face this alone. With clear preparation and the right support, you can protect your family’s future and resolve matters smoothly.

Makoto Matsuo
Founder/CEO & President
Osaka Language Solutions
Osaka, Kansai, Japan

References

1. Civil Code of Japan (Act No. 89 of 1896, major revisions 1947–2026). Ministry of Justice, Japan. https://www.japaneselawtranslation.go.jp/en/laws/view/3494/en
2. Act on General Rules for Application of Laws (Hōrei, Act No. 78 of 2006, amended 2018–2025). Ministry of Justice, Japan. https://www.japaneselawtranslation.go.jp/en/laws/view/3783/en
3. Real Property Registration Act (Act No. 123 of 2004, mandatory inheritance registration amendments 2024). Ministry of Justice, Japan. https://www.moj.go.jp/EN/MINJI/m_minji07_00004.html
4. National Tax Agency (NTA). “Inheritance Tax Guide for Foreigners – 2026 Overview.” Tokyo: NTA, 2026. https://www.nta.go.jp/english/taxes/others/02/15003.htm
5. Japan Legal Support Center (Houterasu). “Inheritance & Succession Procedures – Multilingual Guide.” 2026. https://www.houterasu.or.jp/en/
6. Legal Affairs Bureau (Homukyoku). “Holograph Will Storage System (2020–2026).” 2026. https://www.moj.go.jp/homu/homu05_00001.html
7. Hague Conference on Private International Law. “Convention on the Form of Testamentary Dispositions (1961).” https://www.hcch.net/en/instruments/conventions/full-text/?cid=41
8. Ministry of Justice, Japan. “Mandatory Inheritance Registration & Change-of-Name/Address Rules (2024–2027).” 2024–2026. https://www.moj.go.jp/EN/MINJI/m_minji07_00004.html
9. Mirai Tokyo Legal. “Inheritance Law in Japan – Expat Guide.” 2026. https://mirai-tokyo-legal.com/en/inheritance-law-in-japan/
10. Osaka Language Solutions Proprietary Analyses (2025–2026). Interpreter support experiences in Kansai inheritance mediation, tax filings, and cross-border succession cases for expats.