The Bank of Japan (BOJ) on Friday added a new name to its list of worries: artificial intelligence. In its semiannual financial system report, the central bank said AI could become a fresh stress point for Japan's banks and markets, both through AI-powered cyberattacks and through a potential retreat by foreign "shadow banking" lenders that could jolt Japanese markets.
The warning comes as the BOJ keeps raising interest rates. Last month it lifted its benchmark rate to 1.25%, the highest level in 31 years, and it has signaled it may keep tightening to make sure inflation stays near its 2% target. Higher rates are generally good for banks' lending margins, but they also test the system in new ways.
What the BOJ is watching
In its report, the BOJ said it does not currently see major imbalances in Japan's financial system. But it flagged several pressure points that could emerge as rates rise.
One is property. Home and commercial real estate prices have been climbing faster in Japan's three biggest metropolitan areas, supported by higher construction costs, labor shortages, and demand from foreign buyers. That trend has continued even after the BOJ's rate hikes, and the central bank is monitoring whether it could turn into a bubble.
Another is the market channel. The BOJ highlighted that if expectations for AI-related investment cool, global investors could quickly cut risk. The pullback would likely be led by foreign non-bank financial institutions (NBFIs)—such as private credit funds and private equity firms—and could spill over into Japanese stocks, which have benefited from AI enthusiasm.
That matters because Japanese banks still hold significant equity portfolios. If share prices fall, banks can suffer mark-to-market losses, which eat into their capital buffers and internal risk limits. That, in turn, can make them more cautious about lending, even before actual loan losses appear.
The cyber risk angle
The BOJ also pointed to a newer threat: generative AI lowers the cost of launching cyberattacks. A major incident at one bank could quickly spread and become a system-wide problem, the central bank warned.
This is not just a technology issue. For investors, it means that a single cyber event could ripple through the financial system, affecting confidence and potentially triggering broader market moves.
What it means for investors
For everyday investors, the BOJ's report is a reminder that the financial system is interconnected. The central bank is essentially pointing to a balance-sheet amplifier: if AI enthusiasm fades and Japanese equities drop, banks' equity holdings can lose value, forcing them to tighten credit or pull back from riskier activities.
That dynamic matters more in a tightening cycle, when funding costs are rising and supervisors are watching lending behavior closely. A de-risking move led by foreign NBFIs could spill into Japan through share prices and then through tighter domestic financial conditions, especially in the property-heavy metro areas the BOJ is monitoring.
For now, the BOJ sees no immediate crisis. But its warning highlights how a single technology trend—AI—can create both opportunities and vulnerabilities. Investors with exposure to Japanese stocks or banks should keep an eye on how AI-related sentiment evolves, as well as on any signs of stress in the property market.
The BOJ's report also comes as Japan's economy shows mixed signals. While core inflation has climbed back above the BOJ's 2% target, factory growth has cooled to a seven-month low as demand softens. That combination makes the central bank's path forward a delicate balancing act.
For those following Japanese markets, the key takeaway is that the BOJ is not just watching inflation and wages—it is also watching how financial markets and bank balance sheets interact. The next few months will show whether the AI-driven rally in Japanese stocks can hold, and whether banks can navigate the risks the central bank has flagged.
