www.digital.go.jp/policies/mynumber_faq_09

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よくある質問：預貯金口座付番制度について｜デジタル庁

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https://www.digital.go.jp/policies/mynumber_faq_09

About this page

This page provides FAQs about the deposit account assignment system with My Number. The system allows account holders to voluntarily register their My Number with financial institutions, enabling confirmation of accounts during inheritance or disasters. All financial institutions are eligible, requiring a My Number card for registration. Assignment is voluntary and never mandatory. The system differs from the public payment account registration system. Registration does not transmit income or asset information to the government. Multiple institutions can be registered simultaneously through the Deposit Insurance Corporation.