Tumbling global government bonds puts yields on brink of 4%, highest level in nearly 20 years

Global government bonds have lost about 2.4% in 2026, following a 6.8% gain in 2025, according to the Bloomberg index. This worsening bond sell-off has pushed the average yield on global debt to within a few basis points of 4%, a level not seen since 2007. Yields on Bloomberg’s Global Aggregate Treasuries index surged eight basis points to 3.99% on Wednesday, September 23.

The U.S. Treasuries have been a significant driver of these losses due to strong economic data, persistent inflation, and mounting fiscal concerns, which suggest interest rates will remain elevated for a longer period. The sell-off could raise borrowing costs for governments, businesses, and households, making stocks less appealing as higher yields erode the value of future corporate earnings.

A recent five-year U.S. debt auction ranked as one of the weakest in data since 2018, reflecting the rising cost of servicing around $40 trillion in debt. While inflation remains high and sticky in many regions, labor markets are tight for various reasons, and economies are still growing well, according to Amy Xie Patrick, a money manager at Pendal Group.

She believes bonds are behaving rationally given these economic fundamentals. The pressure on global bonds spread to Asia, with yields on policy-sensitive Australian government debt rising 13 basis points to 5.07%, its highest since May 2011, and New Zealand's two-year yields climbing as much as 17 basis points to just under 4%.

In Japan, the 10-year yield hit its highest since 1996 after the market reopened from a three-day break and caught up with the global sell-off. Strategists at JPMorgan Chase and KKR anticipate further rises in U.S. yields as energy-driven inflation, heavy government borrowing, and the risk of additional central-bank tightening persist.

U.S. five-year yields topped 5% on Wednesday for the first time since 2007, while 10-year yields jumped the most since the April 2025 Liberation Day tariff shock. Strong economic data and surging oil prices prompted traders to increase their bets on further Federal Reserve tightening, with swaps now reflecting three quarter-point hikes over the next year and significant hedging for a fourth.

A $70 billion five-year Treasury auction on Wednesday drew the highest yield since 2006. While short-dated bonds may appear cheap, investors like Damien Loh, chief investment officer at Ericsenz Capital, advise against trading against the market's momentum and price action. Risk-averse investors may prefer yield-curve steepeners such as 2s10s or 5s30s as a better risk-reward trade.

Rising volatility is further dampening sentiment, making investors more hesitant to enter the market even as higher yields make bonds more attractive. The ICE BofA MOVE Index, which gauges US bond market swings, climbed to its highest level since March. Fixed income investors generally favor higher yields but are cautious about the stability of these yields, fearing a "falling knife" scenario.