Japan has officially implemented the Crypto-Asset Reporting Framework (CARF) from January 1, 2026, to combat cross-border tax evasion involving cryptocurrencies. Developed by the OECD, this framework mandates Japanese crypto exchanges, such as Coincheck, to collect and report users' tax residency information. Existing users must submit their tax residency details by December 31, 2026, while new users are required to provide this information upon account creation. Failure to comply or providing false information may result in legal penalties.