Japan's 10-year government bond yield crossed the 3% threshold on Tuesday for the first time in three decades, a milestone that underscores the scale of the global sovereign debt sell-off. The yield, which has more than tripled in two years, reflects a combination of persistent inflation, fiscal concerns, and near-certain expectations that the Bank of Japan (BOJ) will raise interest rates again this month.
The move is not isolated to Tokyo. Global bond yields have climbed to their highest levels since 2008, with a Bloomberg gauge of government debt rising for a fourth consecutive day to 3.72%. Rising oil prices have stoked inflation worries, while Federal Reserve Chair Kevin Warsh's hawkish speech at Jackson Hole has increased the odds of a US rate hike. Thirty-year US Treasuries are enduring their worst run since 2006.
BOJ's tightening path
The immediate driver for the Japanese yield surge is monetary policy. The BOJ's benchmark rate currently stands at 1%, a level last seen 31 years ago, achieved through a series of gradual hikes: from 0.5% to 0.75% in December, and then to 1% in June. The central bank meets on 17 and 18 September, with markets pricing an 80% to 90% probability of a further increase to 1.25%. If realised, that would represent a 0.75 percentage point rise in just nine months.
Shorter maturities are also at extremes. The five-year yield is at a record high, while the two-year has reached a peak not seen in over three decades. The sell-off has been amplified by the fiscal expansionist agenda of Prime Minister Sanae Takaichi, who took office last October on a platform that investors have increasingly viewed as reckless.
Washington's push for faster hikes
US Treasury Secretary Scott Bessent used the G20 finance meeting in Asheville, North Carolina, to press Tokyo for faster rate hikes. "I have information that the market doesn't have, and it's my belief that the Japanese government and the BOJ will do the things that will lead to a stronger yen," he told reporters. When asked if he meant higher interest rates, Bessent replied: "I think the market is pricing that in now."
A day earlier, Bessent had expressed confidence that BOJ Governor Kazuo Ueda would "do the right thing" on monetary policy. According to Japanese public broadcaster NHK, Bessent told both Ueda and Finance Minister Satsuki Katayama that Japan's next move should be a rate hike, and urged Tokyo to signal that it is putting public finances on a sustainable footing.
However, Katayama's account of the meeting was more restrained. "We confirmed that an orderly yen exchange rate is essential for the stability of global financial markets, including those of the United States, and that the continued coordinated efforts of Japan and the United States contribute to achieving this shared objective," she said. Katayama insisted that monetary policy was not discussed, declined to comment on whether current yen levels are orderly, and referred to the joint intervention statement as "a very strong one and still lives."
A senior Japanese finance ministry official was blunter, stating that the BOJ sets policy according to Japan's economy, not Washington's directives.
Currency at the centre
The yen traded around 160 per dollar on Tuesday, a level that markets treat as the threshold for renewed intervention. The currency has strengthened about 3% after weakening to its softest since the rare joint US-Japan intervention in late July. Bessent described recent moves as not disorderly, suggesting that rate hikes, rather than intervention, are the preferred remedy.
For European readers, the developments in Tokyo carry broader implications. As rising bond yields across Europe already strain public finances, a sustained global sell-off could push borrowing costs higher in the eurozone and beyond. The BOJ's tightening, if it continues, may also affect global capital flows, with potential spillovers for European markets.
The G20 meeting in North Carolina has highlighted the growing coordination—and friction—between Washington and Tokyo on monetary policy. While Bessent's public statements are unusually direct, the Japanese side insists on its independence. The outcome of the BOJ's September meeting will be closely watched not only in Tokyo but in financial capitals worldwide.
