[Japan Implements Crypto-Asset Reporting Framework (CARF) to Promote Transaction Information Sharing] Starting January 1, 2026, Japan will officially implement the Crypto-Asset Reporting Framework (CARF) issued by the Organisation for Economic Co-operation and Development (OECD) to facilitate the sharing of crypto-asset transaction information among tax authorities worldwide. This mechanism has been introduced through Japan's tax reform, with the National Tax Agency releasing a user guide by December 2025 and promoting preparatory work for information collection by exchanges. As a result, Japanese crypto exchange Coincheck notified users on January 6 to submit information such as their 'tax residency country.' Other exchanges will also gradually carry out related procedures. Users who opened accounts before the end of 2025 must submit their information by December 31, 2026. New users opening accounts from 2026 onward will need to complete the declaration at the time of account opening. Late or false declarations may result in legal penalties.