Global Bond Sell-Off Spreads! Japan 10-Year Government Bond Yield Surges to Highest Level Since 1996

After Japan’s bond market reopened following a long weekend, it was immediately swept up in the global bond selloff wave. On Thursday, Japan’s 10-year government bond yield surged to its highest level since August 1996, rising in tandem with U.S. Treasury yields to multi-decade highs, signifying a historic, synchronized repricing across the world’s major bond markets.

The yield on Japan’s 10-year government bonds rose by 10 basis points to 3.075% on Thursday, while the 5-year yield climbed 9.5 basis points to 2.37%, with yields rising across all maturities. Meanwhile, the U.S. 10-year Treasury yield also climbed to a near 19-year high, Japan’s 30-year bond yield rose nearly 7 basis points to 4.134%, and the 5-year yield set a new record high at 2.345%.

This wave of selling was driven by a combination of factors: the rebound in oil prices stoked inflation concerns, stronger-than-expected U.S. economic data reinforced expectations of ongoing rate hikes by the Federal Reserve, and weak demand for a $70 billion 5-year U.S. Treasury auction directly pushed up yields. After a three-day holiday, the Japanese bond market reopened under immense pressure, with the decline particularly sharp.

U.S. Bond Selloff as the Catalyst

The core force behind this recent global bond market turbulence comes from the United States. According to UOB’s research report, a combination of rebounding oil prices, stronger-than-expected U.S. PMI data, and weak demand for the $70 billion 5-year U.S. Treasury auction drove the 5-year U.S. yield above 5%, lifting yields across the Treasury curve to near 20-year highs.

Strong economic data has prompted the market to reassess the Federal Reserve’s monetary policy outlook, with expectations for short-term rate cuts by the Fed further diminishing and longer-term rates coming under pressure. This trend rapidly transmitted to global sovereign bond markets, with Japan’s bond market among the most affected.

Bank of Japan Rate Hike Signals Add Double Pressure

The pressure on Japan’s bond market is not merely external. Last Friday, the Bank of Japan raised its benchmark interest rate and hinted at possible further tightening of monetary policy, but failed to provide clearer guidance on the pace of future actions, leaving traders generally disappointed.

This stance placed dual pressures on Japanese government bond yields: firstly, market expectations for further rate hikes by the Bank of Japan continued to mount; secondly, Japan was hit by spillover shocks from the global repricing of long-term borrowing costs. The combination of these forces led to a concentrated wave of selling upon the market's reopening after the holiday.

It’s noteworthy that, according to Bloomberg, earlier this month, Japan’s benchmark borrowing costs had already risen to their highest levels in three decades following U.S. Treasury Secretary Scott Bessent’s public remarks urging Tokyo and the Bank of Japan to support the weak yen. The latest yield spike suggests Japan’s bond market is in the midst of its most severe period of rising rates in many years.

Fiscal Concerns Intensify Market Worries

Beyond monetary policy considerations, the outlook for Japan’s government spending is also unsettling investors. The Japanese government is reportedly considering setting its medium-term defense budget target at 3.5% of GDP, in line with NATO and other U.S. allies’ standards. This has intensified concerns over Prime Minister Sanae Takaichi’s broader spending plans.

Under the dual pressures of persistent inflation and expectations of fiscal expansion, investors are demanding higher risk premiums to hold Japanese government bonds, further fueling this selling wave. The continued rise in yields implies Japan’s future debt financing costs will increase significantly, bringing renewed market attention to debt sustainability issues.

Analysts believe the simultaneous sharp rise in both Japanese and U.S. bond yields marks a systemic repricing of long-term borrowing costs in the world’s major economies.

Japan’s bond market is distinctive in that for a long time, it served as a crucial anchor for the global low interest rate environment. As Japanese government bond yields accelerate higher, some global asset allocation strategies reliant on yen carry trades now face renewed scrutiny, potentially driving increased market volatility.