Japan’s Bond Market Turmoil Puts BOJ in a Policy Vice

The Bank of Japan (BOJ) is navigating a precarious economic landscape as surging government bond yields threaten to derail its recent move toward policy normalization. Benchmark 10-year Japanese Government Bond (JGB) yields climbed to 1.917% on Thursday, marking their highest point since 2007. The pressure is even more pronounced further out on the curve, with 20-year yields reaching 2.936%—a level unseen since 1999—and 30-year yields hitting a record high of 3.436%.

This volatility follows the BOJ’s March 2024 decision to abandon its yield curve control and end its negative interest rate policy. However, with inflation persistently exceeding the 2% target for 43 consecutive months, the central bank faces a difficult dilemma: tighten rates further to combat inflation, or pause to prevent a deeper economic slowdown. The situation is complicated by Japan’s massive debt-to-GDP ratio, which sits at approximately 230%, the highest in the world.

Fiscal challenges are mounting as the government prepares a significant stimulus package to address the cost-of-living crisis. According to Julius Baer, the 11.7 trillion yen in new debt issuance planned to fund this budget is 1.7 times larger than previous allocations, raising serious questions about long-term fiscal sustainability.

While the market remains wary of a repeat of the August 2024 volatility—when a hawkish BOJ pivot and a U.S. economic scare triggered a 12.4% crash in the Nikkei—analysts suggest the current environment is distinct. The narrowing yield gap between Japan and the U.S. continues to discourage yen-funded carry trades, yet the risk remains that any aggressive intervention by the BOJ to cap yields could inadvertently weaken the yen and exacerbate imported inflation.