FAQ: About My Number System｜Digital Agency

This page provides FAQs about the My Number System. My Number is a 12-digit identification number assigned to all residents, used for administrative procedures including social security, taxation, and disaster response. The system enables efficient information exchange between institutions and improves citizen convenience and administrative efficiency. Before its introduction, each agency managed personal information using different numbers such as resident registry codes and pension numbers, requiring time-consuming manual identification during inter-agency information exchanges. The common numbering system resolves this inefficiency.