Bond sell-off deepens on Iran shock

U. S. Treasuries fell across the curve after President Donald Trump used a televised address to harden his stance on Iran, unsettling investors who had been looking for signs of de-escalation and instead got a warning of heavier military action that sent oil prices sharply higher and revived fears of another inflation pulse through the global economy.

The move in government debt reflected a quick reassessment of the inflation outlook. Brent crude climbed to around $108 a barrel and U. S. crude moved above $106 after Trump said the United States would keep up attacks on Iran and “finish the job”, while offering no clear timetable for a ceasefire or reopening of disrupted energy routes. Higher oil fed directly into concerns that central banks, especially the Federal Reserve, may have less room to cut rates than markets had hoped only weeks ago.

That combination of geopolitics and price pressure hit bond markets at a sensitive moment. Investors had already been weighing the inflationary effect of higher fuel costs, tighter shipping conditions and supply disruptions linked to the Iran conflict. Trump’s prime-time remarks removed some of the optimism that had been building after earlier comments suggesting operations could wind down. Instead, the speech pointed to a longer confrontation, prompting traders to mark down Treasuries and push yields higher. Reuters’ global markets analysis described the reaction as a broad reversal in sentiment, with stocks sold, the dollar supported and U. S. debt weakened as investors reduced risk exposure before a holiday-thinned trading period.

The bond sell-off matters beyond Wall Street because Treasury yields shape borrowing costs across the U. S. economy. Mortgage rates have already climbed, with the average contract rate on a 30-year mortgage rising to 6.57%, the highest since August, according to Mortgage Bankers Association data reported by Reuters. That rise has come as investors scale back expectations for monetary easing and price in the risk that an energy-driven inflation shock will keep policy tighter for longer. Housing, one of the most rate-sensitive parts of the economy, is beginning to feel the strain at what is usually a key period for buyers and sellers.

Oil has become the clearest transmission channel from the battlefield to financial markets. Traders are not only responding to the immediate jump in crude prices but also to the wider threat to shipments through the Strait of Hormuz, one of the world’s most important energy corridors. Reuters reported that the International Energy Agency has warned supply disruption could begin hitting Europe more visibly in April as earlier-arranged deliveries run out. Analysts have also pointed to growing anxiety over maritime security after attacks linked to the conflict affected tanker traffic in the Gulf. The result is a market that is treating each political signal from Washington and Tehran as a direct input into inflation pricing.

Central bankers have begun acknowledging that shift. Federal Reserve Governor Lisa Cook said last week that the balance of risks has moved towards inflation because of the Iran war, even as the labour market remains in focus. Her comments were notable because they underlined how quickly the policy conversation has changed. Before the conflict intensified, the debate had centred more squarely on slowing growth and the possibility of rate relief. Now the risk of higher oil, transport costs and imported price pressures is complicating that outlook.

The concern is not confined to the United States. The Bank of England said this week that the Iran war has increased threats to financial stability, describing the energy shock as a significant negative supply event. In Germany, leading economic institutes cut their growth forecasts and raised inflation projections, citing higher oil and gas prices tied to the conflict. Former Bank of Japan official Nobuyasu Atago also warned that policymakers in Tokyo may be underestimating the economic damage from supply-chain disruption and focusing too narrowly on inflation alone. Those warnings point to a broader fear now taking hold in global markets: not just higher prices, but the prospect of stagflation-like conditions if energy costs remain elevated while output weakens.

For investors, that creates an unusual tension around Treasuries. U. S. government debt is normally treated as a haven in times of war, yet this episode has shown that haven demand can be blunted when the shock itself threatens to reignite inflation. Reuters reported that even the dollar’s safe-haven rebound has looked fragile, with strategists arguing its appeal has been dulled by policy uncertainty and rising yields. Treasuries, too, have struggled to attract the kind of sustained buying that might usually accompany a military crisis, precisely because the conflict is being read as an oil shock first and a flight-to-safety event second.