Japan's National Tax Agency began operating KSK2, its next-generation integrated tax management system, on September 24, replacing a core platform that had operated for about 25 years. The system consolidates individual and corporate information through My Number personal IDs and corporate numbers, and uses artificial intelligence to detect improper tax filings. Tax firm Progo said cryptocurrency transactions are becoming a focus of AI-based reviews, with officials able to compare annual exchange trading reports, bank deposit and withdrawal records, and information shared through the Common Reporting Standard with overseas tax authorities. Progo also said social-media posts describing crypto profits could be checked against filed tax returns.