Tokyo debt rout jolts global bonds

Japan’s government bond market has become the centre of a global debt selloff as higher oil prices, stubborn inflation and expectations of tighter monetary policy push borrowing costs across major economies to levels not seen for years.

The sharpest pressure has fallen on long-dated Japanese government bonds, where the 30-year yield has climbed above 4 per cent, reaching a record since the maturity was introduced in 1999. The 10-year yield has also risen to around 2.8 per cent, its highest level in nearly three decades, marking a decisive break from the low-yield era that defined Japan’s markets for much of the post-deflation period.

The selloff has rippled across global debt markets. US Treasury yields have moved higher, with the 30-year yield testing levels above 5 per cent, while Germany’s benchmark bonds and UK gilts have also weakened. Bond prices move inversely to yields, meaning the surge in yields reflects heavy selling by investors who are demanding greater compensation for inflation, fiscal risk and uncertain central bank policy.

Rising oil prices are the immediate catalyst. Brent crude has moved above $100 a barrel as geopolitical tensions in the Middle East disrupt energy flows and heighten concerns over import costs for major economies. For Japan, which relies heavily on imported energy, the oil shock carries a particularly direct inflationary threat. A weaker yen has amplified the impact, increasing the local-currency cost of fuel, food and other imported goods.

Japan’s inflation backdrop has become more difficult for policymakers. Consumer prices have remained above the Bank of Japan’s 2 per cent target for an extended period, while corporate goods prices have shown persistent pressure from energy, raw materials and logistics costs. Investors are now pricing in a greater chance that the central bank will raise interest rates again, possibly as early as its next policy meetings, after years of extraordinary accommodation.

Fiscal concerns are adding to the strain. Tokyo is preparing additional spending to cushion households and businesses from rising fuel and utility costs, but fresh borrowing could worsen concerns over debt sustainability. Japan’s public debt is already among the highest in the developed world, making long-term bond investors more sensitive to any increase in issuance. The prospect of larger supply has hit demand for longer maturities, where insurers, pension funds and banks traditionally played a stabilising role.

The Bank of Japan faces a delicate balance. Raising rates too quickly could unsettle growth and worsen losses in bond portfolios held by financial institutions. Moving too slowly could allow inflation expectations to become entrenched and place further pressure on the yen. The central bank has already scaled back its dominance of the bond market compared with the period of yield-curve control, leaving prices more exposed to market forces.

Global investors are also reassessing the role of government bonds as a safe asset. During earlier market shocks, US Treasuries, German Bunds and Japanese government bonds often rallied as investors sought protection. The current episode is different because the shock is inflationary rather than deflationary. Higher energy prices reduce household purchasing power, raise business costs and complicate the task of central banks that had hoped to cut rates or keep policy steady.

The selloff has implications beyond financial markets. Higher sovereign yields raise funding costs for governments already facing pressure from defence spending, ageing populations, energy subsidies and climate-related investment. They also affect mortgage rates, corporate borrowing and equity valuations. Technology shares and other growth-sensitive assets tend to come under pressure when long-term yields climb, because future earnings are discounted more heavily.

Japan’s shift is especially important because its low yields long encouraged domestic investors to buy overseas bonds. As yields rise at home, insurers and pension funds have less incentive to take currency risk abroad, potentially reducing demand for US and European debt. That repatriation effect could intensify volatility in global markets if Japanese institutions continue to rebalance portfolios.