TOKYO — Japanese government bond yields rose Thursday, reflecting investor skepticism about the Bank of Japan's ability to contain persistent inflation. The 10-year JGB yield climbed three basis points to 0.98 percent, closing in on the 1.0 percent ceiling the BoJ defended earlier this year.
The BoJ has maintained ultra-loose monetary policy for years, anchored by negative interest rates and yield curve control. That stance was designed to break decades of deflation. Japan's core consumer price index registered 2.8 percent in June, the 18th consecutive month above the BoJ's 2 percent target — compared with a pre-pandemic average of 0.5 percent.
Under YCC, the BoJ actively buys JGBs to hold the 10-year yield near zero, with a flexible upper bound. That policy has suppressed borrowing costs and distorted price discovery. Current market pressure suggests the distortion is becoming untenable.
Traders at major U.S. and European funds are adding short positions in JGBs. "The BoJ's commitment to its current policy framework faces a serious challenge from persistent price pressures," said Anna Wong, head of fixed income research at Evercore ISI, whose firm holds a short JGB position.
BoJ Governor Kazuo Ueda has said the current inflation is primarily cost-push, driven by import prices rather than demand-driven wage growth. He has maintained the bank needs to see sustained wage increases before tightening further.
Market participants expect the BoJ to announce YCC adjustments at its Sept. 19-20 meeting — either widening the target band or abandoning the ceiling. Failure to act could trigger a sharper JGB selloff and a weaker yen.
Higher yields carry real fiscal consequences. Japan's debt-to-GDP ratio exceeds 260 percent, and domestic banks face duration risk on their extensive JGB holdings if yields continue rising.
The Japanese yen weakened to 148.5 against the U.S. dollar, falling 0.3 percent as the interest rate differential between Japan and major economies that have tightened aggressively continued to widen.
The spread between Japanese and U.S. 10-year Treasury yields has compressed to 340 basis points from 380 basis points a month ago, as rising JGB yields offset stable U.S. rates — a dynamic that reduces the yen carry trade's appeal and raises the cost of the BoJ's balance sheet defense.
A forced unwind of the BoJ's balance sheet would reprice global duration risk, and institutional investors from New York to London are positioning accordingly ahead of Sept. 19.
