Introduction

If your client has assets in Japan, handling inheritance is rarely a straightforward extension of common law probate practice. Japanese succession operates under a fundamentally different legal structure, particularly in relation to governing law, documentation, and asset transfer procedures.

Foreign lawyers often encounter unexpected obstacles—such as rejection of documents, delays in bank procedures, or difficulties in proving heirship—when dealing with Japanese institutions.

This article provides a practical checklist for foreign lawyers handling Japanese inheritance matters and highlights the key points where coordination with Japanese counsel becomes essential.

Step 1: Confirm the Applicable Law and Identify Legal Heirs

Under the Act on General Rules for Application of Laws, inheritance is generally governed by the national law of the deceased. Therefore, determining the applicable law is the first step.

If the deceased was a Japanese national, Japanese inheritance law will generally apply. If the deceased was a foreign national, the law of that nationality applies, although renvoi may result in the application of Japanese law.

Once the governing law is identified, legal heirs must be determined. Japanese law recognizes statutory heirs such as spouses, children, parents, and siblings.

A distinctive feature of Japanese practice is the koseki (family register) system. The koseki records family relationships and is the primary evidence used to establish heirship.

In practice, Japanese authorities will not proceed without proper family register documentation.

Step 2: Prepare Documentation and Understand Procedural Requirements

After identifying heirs, the next step is preparing the necessary documentation.

Japanese institutions typically require:

Certified copies of family registers (koseki)
Death certificates
Identification documents of heirs
A will, if applicable
An agreement among heirs regarding asset division

For foreign heirs, additional requirements may include notarization, apostille authentication, and Japanese translations.

Japanese institutions apply strict formal requirements. Even minor discrepancies in names or dates may result in rejection.

Early coordination with Japanese counsel is often critical to avoid delays.

Step 3: Understand the Absence of Probate

Japan does not have a comprehensive probate system. Heirs automatically succeed to the assets and liabilities upon death.

Estate administration is generally handled privately by the heirs, who must agree on the distribution of assets.

If no agreement is reached, the matter is referred to the Japanese family court for conciliation or adjudication.

Disputes significantly extend the timeline and increase complexity.

Step 4: Coordinate with Japanese Institutions

Japanese banks, registries, and authorities operate under strict compliance standards.

Common challenges include:

Requests for additional documentation
Difficulties in accepting foreign documents
Strict identity verification procedures

Even legally valid documents may not be accepted if they do not meet institutional practices.

Coordination with professionals familiar with Japanese procedures is often necessary.

Step 5: Identify When Local Counsel Is Required

While some aspects appear administrative, many cases require legal judgment, including:

Conflict-of-laws issues
Application of foreign law
Disputes among heirs
Complex asset structures

Foreign lawyers should consider involving Japanese counsel when:

Multiple jurisdictions are involved
The governing law is unclear
Heirs cannot travel to Japan
Real estate or substantial assets are involved
Documentation is complex

Conclusion

Handling Japanese inheritance cases requires more than legal knowledge. It requires understanding procedural practice and institutional expectations.

For foreign lawyers, early coordination with Japanese professionals is essential to ensure efficient and reliable administration of cross-border estates.