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The bank account numbering system under the Account Management Act was expanded on April 1, 2025. With the individual’s consent, it links a My Number to bank deposit accounts, mainly to simplify procedures during inheritance and disasters.

Materials

Main benefits:

Simpler procedures for inheritance and disasters

  • Assigning a My Number to accounts makes it easier during inheritance or disasters to locate deposit accounts held at multiple financial institutions and obtain related information.
  • The material explicitly says that during inheritance or a disaster, users can locate deposit accounts and receive information about them. (From “Material 2”)
  • Publicity material similarly explains that numbering an account at a financial institution enables users to identify numbered accounts during inheritance or disasters. (From “Material 1”)

Linking multiple accounts through My Number

  • With the individual’s consent, a My Number can be assigned at once to deposit accounts at multiple institutions through a financial institution or Myna Portal.
  • The material says that, subject to consent, multiple deposit accounts can be numbered at once through financial institutions and Myna Portal. (From “Material 2”)
  • The diagram shows how to notify multiple institutions of a My Number via Myna Portal or a financial institution’s counter. (From “Material 2”)

Addressing concerns

Voluntary participation

  • Reporting a My Number to a financial institution is voluntary, not mandatory.
  • The Digital Agency website explicitly states that reporting a My Number to financial institutions is voluntary. (From “Expansion of the Bank Account Numbering System | Digital Agency”)

Privacy considerations

  • Reporting a My Number does not directly allow the government to ascertain assets. Financial institutions do not report deposit balances to the government merely because a My Number was submitted.
  • The material explains in Q&A form that a financial institution will not notify the government of account balances merely because a My Number was reported. (From “Material 2”)
  • It also explains that the government has always been able to check account information only when conducting legally authorized inquiries necessary for social security means testing or taxation. (From “Material 2”)
  • Account details are not stored on the My Number Card, and temporary suspension is available if it is lost or stolen. (From “Material 2”)

Start date

  • The Account Management Act system begins in Reiwa 7 (2025), on April 1.
  • The opening of the material prominently says, “Starts April 1, Reiwa 7!” (From “Material 3”)

Procedure: How can I register?

  • Subject to consent, an individual can request through a financial institution or Myna Portal that a My Number be assigned to multiple deposit accounts at once.
  • Registration—requesting assignment of a My Number—appears possible through the following methods.
    • Financial institution counter: Bring a My Number Card to the counter and report the number for the account. It is planned that one institution’s counter will enable users to identify their numbered deposit accounts.
    • Myna Portal: Users will be able to request assignment of a My Number to accounts at multiple institutions at once. However, as of April 2 11:47 it was apparently not ready. The toll-free service advised using a financial institution counter or asking again later.

Important points

  • Account Management Act system: The system for assigning My Numbers to deposit accounts.
  • Benefits of My Number assignment: It simplifies inheritance and disaster procedures and enables consolidated confirmation of multiple accounts.
  • Myna Portal: It is planned to enable account-numbering procedures through the online My Number service.
  • Difference from the Public Money Receiving Account Registration System: The bank account numbering system facilitates information checks during inheritance and disasters; it differs from registering with the government an account for receiving benefits.
  • The Digital Agency website clearly explains the difference between the two systems. (From “Bank Account Numbering System | Digital Agency”)
  • Importance of updating addresses: If an address or other information registered with an institution is outdated, numbering may fail, so updating it beforehand is recommended.
  • The material warns that if an address registered with a financial institution has not been updated, the account may not be recognized as belonging to the person and a My Number cannot be assigned. (From “Material 2”)
  • Contact: The My Number general toll-free number (0120-95-0178) is listed for inquiries about the system and this matter. (From “Material 2”)

Conclusion

Beginning on April 1, 2025, the Account Management Act system uses My Numbers to manage deposit-account information centrally and reduce the burden of procedures in emergencies such as inheritance and disasters. Reporting a My Number is voluntary, and privacy has been considered. Users should confirm and update information registered with their financial institutions.

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