Banking Law in Japan

The Banking Act

The principal legislative framework for banking in Japan is the Banking Act (Ginkō Hō, Law No. 21 of 1927). Originally enacted in the late Taishō period, the Act has undergone fundamental revisions, most notably in 1981 (when it was substantially rewritten to align with international banking standards), 1998 (post-financial crisis reforms), and 2006 (consolidation of financial regulation). The Banking Act defines a bank as a person licensed by the Prime Minister (acting through the Financial Services Agency) to engage in deposit-taking, lending, and fund transfer services.

The Banking Act adopts a universal banking model in which licensed banks may engage in a broad range of financial activities, including securities intermediation, derivatives trading, and trust business, subject to appropriate risk management safeguards. However, the Act maintains a separation between banking and commerce: Article 12 prohibits a bank from holding more than 5% of the voting rights of a non-financial company (the “5% rule”), a provision designed to prevent the re-emergence of the zaibatsu-style industrial concentration that characterized pre-war Japan.

Types of Banks

Japanese banking law recognizes several categories of licensed banks. City banks (toshi ginkō) are the large, nationally operating banks, including the three “megabanks” — MUFG Bank, Sumitomo Mitsui Banking Corporation, and Mizuho Bank — formed through the mega-mergers of the early 2000s. Regional banks (chihō ginkō) operate within a single prefecture or region, and regional banks II (dai-ni chihō ginkō) are smaller institutions that originally were sōgō ginkō (mutual banks). Trust banks (shintaku ginkō) are licensed under both the Banking Act and the Trust Business Act and engage in asset management, custody, and fiduciary services.

The Banking Act also regulates online banks (netto ginkō), which are licensed under the same framework but operate without physical branches. Notable examples include Rakuten Bank and Sony Bank. The licensing requirements for online banks are identical to those for traditional banks, but the FSA applies modified supervisory approaches that focus on IT risk management and cybersecurity.

The Bank of Japan

The Bank of Japan (BOJ) (Nippon Ginkō) is the central bank, established under the Bank of Japan Act (Nippon Ginkō Hō, Law No. 89 of 1997). The 1997 Act, which entered into force in 1998, was a landmark reform that granted the BOJ formal independence from the government, modeled on the Bundesbank and the European Central Bank. The BOJ’s primary mandate is price stability, and its Policy Board determines the conduct of monetary policy through the uncollateralized overnight call rate and, since 2016, through yield curve control.

The 1997 Act also strengthened the BOJ’s supervisory role. The BOJ conducts on-site examinations (kōsa) of banks with which it has current account transactions, focusing on risk management, internal controls, and compliance. The BOJ coordinates with the FSA to avoid duplication, but the two bodies operate independently: the FSA is responsible for prudential regulation and licensing, while the BOJ focuses on financial system stability and payment and settlement systems.

The Financial Services Agency

The Financial Services Agency (FSA) (Kinyū Chō) is the integrated financial regulator, established in 1998 following the financial crisis. The FSA is an external bureau of the Cabinet Office, headed by a Commissioner and reporting to the Prime Minister. Unlike the US multi-agency model (Federal Reserve, OCC, FDIC, SEC) or the UK’s twin-peaks model (FCA and PRA), the FSA is a single integrated regulator responsible for banking, securities, insurance, and credit cooperatives.

The FSA’s supervisory approach is based on the “Better Regulation” framework, articulated in 2007 and periodically updated. The FSA emphasizes forward-looking, risk-based supervision, proportionality, and constructive dialogue with financial institutions. The FSA conducts on-site inspections (kensa) and off-site monitoring, publishes supervisory guidelines, and may impose administrative sanctions including business improvement orders, suspension of business, and revocation of license.

Capital Adequacy and Basel III

Japan implements the Basel III capital adequacy framework through FSA regulations and the Ministerial Ordinance on Capital Adequacy Requirements. The FSA requires internationally active banks to maintain a Common Equity Tier 1 (CET1) ratio of at least 4.5%, a Tier 1 capital ratio of at least 6%, and a total capital ratio of at least 8%, with additional buffers (capital conservation buffer, counter-cyclical buffer, and systemic risk buffers for G-SIBs). Domestic banks are subject to a total capital ratio of at least 4%.

Japan’s three megabanks are designated as Global Systemically Important Banks (G-SIBs) and are subject to higher loss absorbency requirements and enhanced supervisory expectations. The FSA’s capital adequacy regulations also incorporate the leverage ratio, the liquidity coverage ratio (LCR), and the net stable funding ratio (NSFR), consistent with the Basel Committee framework.

The Financial Instruments and Exchange Act

The Financial Instruments and Exchange Act (FIEA) (Kinyū Shōhin Torihiki Hō, Law No. 25 of 1948) is the principal statute regulating securities, derivatives, and financial instruments businesses. The FIEA was comprehensively revised in 2006 (the “Financial Instruments and Exchange Law Reform”) to consolidate the former Securities and Exchange Act and related statutes. Banks conducting securities business are subject to both the Banking Act and the FIEA, with the FSA as the consolidated regulator.

The FIEA introduced the concept of “financial instruments business” (kinyū shōhin torihiki gyō) as a unified regulatory category and established registration requirements, conduct-of-business rules, disclosure obligations, and insider trading prohibitions. The FIEA also provides the framework for Japan’s disclosure system (yūka shōken hōkokusho), requiring publicly traded companies to file annual and semi-annual securities reports.

Deposit Insurance and Resolution

The Deposit Insurance Act (Yokin Hoken Hō, Law No. 34 of 1971) establishes the Deposit Insurance Corporation of Japan (DICJ) as the deposit insurer and resolution authority. The DICJ insures deposits up to 10 million yen per depositor per institution, funded by premiums paid by member financial institutions. The DICJ also provides financial assistance for the resolution of failed banks through purchase-and-assumption transactions, bridge bank operations, and — as a last resort — payouts to insured depositors.

During the financial crisis of the 1990s and early 2000s, the government temporarily lifted the 10 million yen cap and provided blanket guarantees to maintain financial stability. This crisis also led to the establishment of the Financial Reconstruction Commission (1998–2001), which oversaw the recapitalization of the banking system through public funds. The Financial Function Strengthening Act (2004) provides a standing framework for capital injections into solvent but undercapitalized banks.

Cooperative Financial Institutions

Japanese law recognizes a distinct category of cooperative financial institutions that operate under separate statutes. Shinkin banks (shinyō kinko) are cooperative financial institutions regulated under the Shinkin Bank Act (Shinyō Kinko Hō), serving local communities and small and medium enterprises. Credit cooperatives (shinyō kumiai) operate under the Small and Medium Enterprise Cooperatives Act and are generally smaller. The Norinchukin Bank (Nōrin Chūō Kinko), established under the Agricultural and Fishery Cooperative Bank Act, serves as the central bank for agricultural, fishery, and forestry cooperatives.

These cooperative institutions are subject to FSA supervision but are governed by distinctive legal frameworks that reflect their member-owned, not-for-profit character. The 2020s have seen consolidation among Shinkin banks and credit cooperatives as the low-interest-rate environment puts pressure on margins.

FinTech Regulation

Japan has introduced targeted regulatory reforms to accommodate FinTech and digital financial services. The FIEA and Banking Act have been amended to permit electronic payment services (denshi kessai sābisu), including pre-paid payment instruments, fund transfer services (by non-bank licensed operators under the Fund Settlement Act), and crypto-asset exchange services under the FIEA. The FSA operates a regulatory sandbox and a FinTech innovation hub to support proof-of-concept testing.

The Act on Settlement (Kessai Hō, 2009, amended 2019) regulates electronic money and payment services, requiring registration for fund transfer operators and specifying consumer protection requirements. The FSA’s “FinTech Guidelines” (2017, revised 2022) provide interpretative guidance on how existing regulations apply to novel business models, including robo-advisory, crowdfunding, and blockchain-based financial services.

The Bad Loan Crisis and Its Legacy

The Japanese banking crisis of the 1990s was one of the most severe in modern financial history. Following the collapse of the asset-price bubble in 1990–1991, Japanese banks accumulated massive non-performing loans (NPLs), estimated at over 40 trillion yen at their peak. The government responded through a series of measures: the establishment of the Resolution and Collection Corporation (RCC) to purchase and collect NPLs; capital injections through the Deposit Insurance Corporation; the nationalization of failed banks (the Long-Term Credit Bank of Japan and Nippon Credit Bank); and the creation of the Financial Services Agency as a strengthened regulator.

The crisis left a lasting legacy on Japanese banking law, including the evolution of proactive supervisory practices, the development of the prompt corrective action framework (sōki kaisai keikaku), enhanced disclosure requirements, and the establishment of a systematic approach to bank resolution. Japan’s experience informed the development of the international framework for bank resolution adopted by the Financial Stability Board.

Conclusion

Japanese banking law is structured around the Banking Act, the Bank of Japan Act, and the FIEA, with the FSA as the integrated regulator. The system has evolved from the post-war licensed banking model to a sophisticated regulatory framework implementing Basel III, universal banking within firewalls, a robust deposit insurance and resolution system, and accommodating regulation for FinTech. The legacy of the 1990s banking crisis continues to shape supervisory philosophy, emphasizing early intervention, transparency, and systemic stability. Japan’s banking law framework is fully aligned with international standards while retaining distinctive features adapted to the structure of the Japanese financial system.