Japan will implement the OECD's Crypto-Asset Reporting Framework (CARF) starting January 1, 2026, as part of its efforts to enhance crypto tax compliance. The framework mandates crypto-asset service providers in Japan to identify the tax residence of users, collect self-certifications, and report certain transactions involving non-residents. This information will be shared with foreign tax authorities under existing treaties, with the first reports due by April 30, 2027. The new regulations aim to prevent crypto-assets from being used to conceal taxable activities, particularly in cross-border transactions. Users conducting transactions with covered service providers from 2026 must submit self-certifications, including their name, address, and tax identification number. The initiative reflects Japan's commitment to international tax cooperation and increased transparency in the crypto sector.