Global bond markets have experienced a dramatic selloff in March, losing more than $2.5 trillion in value as the escalating conflict between the United States and Iran fuels fears of stagflation, according to Bloomberg. The sharp decline marks the largest monthly loss in over three years, upending expectations that debt would remain a safe haven amid geopolitical turmoil.
Bonds, which typically gain in times of international tension, are tumbling as surging oil prices accelerate inflation and erode the value of fixed payments from debt. Kathryn Rooney Vera, chief market strategist at StoneX Group Inc., told Bloomberg Television that markets are beginning to price in “a stagflationary impulse manifested very soon,” adding that prolonged conflict could push oil prices even higher.
Based on a Bloomberg index, the total market value of government, corporate, and securitized debt has dropped to $74.4 trillion from nearly $77 trillion at the end of February. This 3.1 percent decline is on track to become the steepest monthly fall since September 2022, when the Federal Reserve was implementing an aggressive cycle of interest-rate hikes. Sovereign debt has been particularly hard hit, with a Bloomberg index of government bonds falling 3.3 percent in March, while corporate bonds have lost 3.1 percent.
In the United States, Treasury yields have surged to multi-month highs after three consecutive weeks of losses, as investors anticipate that the Federal Reserve may be compelled to raise rates to rein in inflation. Across Asia, government bond yields in India, Japan, and South Korea have climbed, reflecting rising concerns about the broader impact of the conflict on global finance. In the Pacific region, Australia’s 10-year yields hit their highest level since 2011, while New Zealand saw its 10-year yields reach peaks not seen since May 2024.
The selloff intensified after US President Donald Trump threatened attacks on Iranian power plants unless Iran reopened the Strait of Hormuz, a critical oil shipping route. In response, Iran warned it would close the waterway “completely” if provoked, heightening fears of a broader disruption to global energy supplies.
Market strategists say central banks may be forced to respond with tighter monetary policy, even in the face of slowing growth. Analysts at BNP Paribas noted that the Fed could signal potential rate hikes at its April policy meeting if energy prices remain elevated and unemployment rates remain steady. Meanwhile, European Central Bank Governing Council member Joachim Nagel indicated that the ECB might need to consider raising rates as soon as next month if inflationary pressures intensify due to the conflict.
Trinh Nguyen, senior economist at Natixis in Hong Kong, said that higher inflationary pressures are constraining central banks’ options. “Some will be forced to hike into a down growth cycle to arrest inflation and also FX depreciation,” Nguyen said, underscoring the delicate balance policymakers face between controlling inflation and supporting economic growth.
While equities have experienced far larger losses, with roughly $11.5 trillion wiped out globally, the bond market collapse has drawn attention because debt is traditionally viewed as a stabilizing asset during crises. Investors now face the dual challenge of rising yields and geopolitical uncertainty, with the potential for long-term implications for both sovereign and corporate debt markets.
The March downturn illustrates how quickly conflict-driven risks can ripple through financial markets, destabilizing instruments once considered safe and forcing global policymakers to weigh difficult trade-offs between inflation control and economic support. Bloomberg analysts warn that continued volatility in oil prices and escalating geopolitical tensions could prolong the bond market turbulence well into the second quarter.
