Japanese Banks: The Flight from JGBs as the BOJ Withdraws

As the BOJ scales back its government bond purchases, Japanese commercial banks hesitate to step in—a strain that threatens the stability of Japan's sovereign financing.

The Fact

The BOJ continues its gradual reduction of JGB (Japanese government bonds) purchases as part of its monetary normalization—a pro-hike consensus confirmed in its Summary of Opinions of June 24, 2026. Japanese commercial banks, theoretically the natural buyers to fill this gap, are largely hesitant to increase their exposure. The reason is mechanical: anticipating further BOJ rate hikes means accepting growing unrealized losses on a long-duration bond portfolio. Japan carries a public debt of 260% of GDP that must be refinanced at rising costs.

Our Analysis

This structural paradox—the BOJ is stepping back while banks are not stepping in—creates upward pressure on long-term JGB yields. A breach of the 2% threshold on the 10-year JGB would force the Treasury to offer higher yields to refinance debt, leading to massive unrealized losses in Japanese bank balance sheets. For global markets, this is a warning signal: long-term JGB yields are a catalyst for unwinding the JPY carry trade (

), with a risk of contagion to global risk assets if the movement accelerates.

To Watch

• 10-year JGB yield (critical threshold: 2%)
• Monthly JGB purchase statistics by commercial banks (BOJ)
• Next BOJ meeting: July 2026