Japan

Legal Framework

Japan's AI Promotion Act (Act No. 53 of 2025) was enacted on 28 May 2025 and fully in force from 1 September 2025. It creates an AI Strategic Headquarters chaired by the Prime Minister and requires an AI Basic Plan. The government can collect information on and investigate cases where rights are infringed and give guidance, advice and public announcements to businesses, which must endeavour to cooperate with government measures. The Headquarters adopted guidelines on ensuring appropriate AI research, development and use on 19 December 2025. The Cabinet approved the first AI Basic Plan on 23 December 2025 and a second plan on 14 July 2026. The July 2026 plan says agentic AI makes risks considerably more complex, citing cascading failures, unclear responsibility and autonomous cyberattacks. It commits to rules for government use of AI agents, to safety and security guidelines from the AI Safety Institute that cover agentic AI, and to continuous review of the AI Act and related rules. On 31 March 2026 MIC and METI published version 1.2 of the AI Guidelines for Business, which defines an AI agent as an AI system that senses its environment and acts autonomously to achieve specific goals and adds guidance on agents and physical AI. The Diet passed amendments to the APPI on 10 July 2026 (promulgated 17 July 2026). They drop the consent requirement for sharing personal data used only to create statistical information, including AI development that qualifies as statistics creation, provided the parties publish set details and sign a written agreement, and add surcharges equal to the gains from serious violations. Most provisions take effect within two years of promulgation. The Copyright Act explicitly allows AI training on copyrighted data. The DAORAI research project explores legal frameworks for autonomous organizations. Sources: https://www8.cao.go.jp/cstp/ai/ai_act/ai_act.html ; https://www8.cao.go.jp/cstp/ai/ai_hou_gaiyou_en.pdf ; https://www8.cao.go.jp/cstp/ai/ai_plan/aiplan_20260714.pdf ; https://www.soumu.go.jp/main_sosiki/kenkyu/ai_network/02ryutsu20_04000019.html ; https://www.ppc.go.jp/files/pdf/260717_kaiseihounitsuite.pdf

Key Laws & Regulations

• ◆AI Promotion Act (Act No. 53 of 2025)
• ◆AI Basic Plan (Cabinet decision 14 July 2026; first plan 23 December 2025)
• ◆AI Guidelines for Business v1.2 (MIC/METI, 31 March 2026)
• ◆Copyright Act (amended for AI training)
• ◆Act on the Protection of Personal Information (APPI), amended July 2026

Business Formation

KK (Kabushiki Kaisha) or GK (Godo Kaisha) are standard entity types. GK offers LLC-like flexibility suitable for tech startups. Japan's Web3 national strategy encourages token-based governance structures.

Tax Implications

National CIT of 23.2% plus local enterprise and inhabitant taxes bring effective rate to approximately 30%. Crypto taxation is complex, with corporate holdings taxed on unrealized gains, though reforms are underway.