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About My Number System

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My Number System is an infrastructure for realizing a fairer and more equitable society by improving convenience for citizens and improving administrative efficiency as a foundation for the digital society. Information sharing among administrative agencies in My Number System makes it possible to omit attached documents in various administrative procedures.

Table of Contents

1. My Number

This is a 12-digit number assigned to all residents of Japan who have a certificate of residence. My Number is used for administrative procedures determined by laws and regulations or ordinance, such as social security system, tax system, and disaster response. My Number enables quick and accurate identification of individuals. In addition, by sharing information between administrative agencies in administrative procedures, the number of necessary attached documents will be reduced and administrative processing will become smoother, improving convenience for citizens. Furthermore, it will be possible to quickly provide necessary administrative support to those who need it.

2. Explanation of systems in My Number System

2.1. Information coordination

Information coordination is the exchange of information necessary for administrative procedures between administrative agencies using a dedicated network system (information provision network system).
This makes it possible for citizens and residents to omit the submission of documents for various administrative procedures.

Related Documentation

  • *For information on individual administrative procedures, please be sure to check the pamphlets, websites, etc. of each local government and administrative agency.

2. 2. public money receiving account Registry

Under this program, citizens can voluntarily register their bank accounts at financial institutions as accounts for receiving benefits and other benefits with the central government (Digital Agency).
Accounts that can be registered as a public money receiving account are a deposit account * 1 in the name of the individual and one account for each person * 2. For eligible benefits, etc., please see the Benefits and public money receiving account that can be received using the .

  • * 1 A deposit or savings account in the name of the individual.
    Deposits and savings accounts that can be registered with public money receiving account are only those in the name of the principal.
    For example, you cannot register a savings account in the name of a parent as a public money receiving account for a child.
  • * 2 One account per person
    Only one savings account per person can be registered with public money receiving account.

When registering a public money receiving account, please also read the Terms of Use for Registering Account Information and Using the Linkage System .

For details of the program, please refer to the public money receiving account Registry .

2.3. Deposit Account Numbering System

The My Number numbering system for deposit accounts is a system for reporting My Numbers to financial institutions.
By attaching My Number numbers to bank accounts, in the event of inheritance or disaster, the locations of bank accounts to which My Numbers have been attached can be confirmed at the service counter of a single financial institution.

  • *The public money receiving account Account Numbering Program is different from the public money receiving account Registry Program. Under the Digital Agency Registry Program, each citizen is required to register with the national government (Tokyo Metropolitan Government) one of their current accounts at financial institutions as an account for receiving benefits, etc.

For details of the program, please refer to the Deposit Account Numbering System .

3. My Number System Safety Measures

For My Number System security, in addition to institutional security measures (such as monitoring by identity verification and Personal Information Protection Commission), IT security measures (decentralized management of personal data, mechanisms that do not use the My Number itself for information linkage, etc.) are being taken.

3.1. Institutional safeguards

  • It is prohibited to collect or store personal information, including My Number, except for what is prescribed by law.
  • Personal Information Protection Commission, a third party organization, monitors and supervises whether specific personal information, including My Numbers, is being appropriately managed.
  • There are heavy penalties if you break the law.
  • When providing a My Number, it is mandatory to confirm the My Number and identity. Therefore, it is not possible to immediately impersonate the person to perform procedures using the My Number.
  • In , Mynaportal, the person can check the history of personal information exchanged between administrative agencies, etc.

Related Documentation

3.2. System safety measures

  • Personal information is not managed in a centralized manner. As in the past, each piece of information is managed in a decentralized manner, with pension information managed by pension offices and local tax information managed by municipalities.
  • When information is shared among government agencies, the My Number is not used directly, but a special code is used.
  • We restrict who has access to our systems and encrypt communications.

Related Documentation

Warnings Against My Number System Scams

Call centers, local governments, consumer affairs centers, etc. are receiving information on phone calls, e-mails, letters, and visits that attempt to obtain personal data or to engage in fraudulent solicitations taking advantage of My Number System.

4. Recent Efforts and Studies on My Number System

4.1. Initiatives

Expansion of administrative tasks for which My Number system can be used under the My Number Act and the Act for Partial Revision of the Residential Basic Book Act

In accordance with the Act Partially Amending the My Number Act and the Residential Basic Book Act promulgated on May 23, 2025, the number of administrative processes where My Number can be used will be expanded to improve the efficiency of administrative processes and the convenience of citizens.

  • Expand clerical work related to national qualifications for which My Number can be used (clerical work related to 44 qualifications including judicial scriveners, certified public accountants, veterinarians, and electricians).
  • Expand other administrative tasks for which My Number can be used (12 administrative tasks).
Related Information

Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures and the Act for Partial Revision of the Residential Basic Book Act (Act No. 38 of 2025)

4.2. Survey Research

Research (commissioned) on initiatives relating to "once-only" administrative procedures utilizing the Single Identification Number System in other countries

Similar to My Number System, some other countries have introduced the Identification Number System (hereinafter referred to as the "Common Number System") to identify specific individuals by using numbers, etc. assigned to individual citizens for the purpose of using them in administrative procedures, etc.

4.3. Relevant Information on My Number System

Materials and related information on the handling of My Number are posted.

Handling of My Number by financial institutions

  • *We post materials that were made before the inauguration of Digital Agency.

Provision of information by financial organizations (external link)

5. Frequently Asked Questions

For frequently asked questions, we have compiled the answers on the following page.