Global Bond Yields Surge as Oil Prices Fuel Inflation Worries

Global bond yields surged Tuesday as renewed tension between the U.S. and Iran reinforced inflation expectations, which increased the prospect of interest-rate hikes in the coming months.

The 10-year U.S. Treasury yield rose to 4.798%, the highest since January 2025, according to LSEG data. The U.S. two-year Treasury yield rose to 4.369%, which would be its highest settlement also in 19 months, reflecting rising bets on an interest rate increase by the Federal Reserve in September.

One-year ahead U.S. inflation expectations, as measured by derivative markets, have crept up to 2.5% from less than 2% in the past couple of weeks, according to LSEG.

The 10-year Japanese government bond yield crossed 3% to hit a 30-year high. The 10-year German Bund yield reached 3.364%, unseen since 2011.

In the U.K., the 10-year gilt yield rose to 5.255%, its highest since 2008, while the 30-year gilt yield rose to levels unseen since 1998.

"Global bonds are facing a perfect storm of rising inflation fears, driven by higher energy prices, which are in turn raising rate hike expectations," Leon Ferdinand Bost, analyst at Metzler said. "At the same time, fiscal concerns are back at the forefront and together with heavy supply are weighing on the long end," he said.

The rise in yields followed Federal Reserve Chairman Kevin Warsh's message on Friday at the Jackson Hole symposium about unfinished work on fighting inflation.

"We must be confident that underlying inflation is moving to our objective, clearly and at sufficient speed. Otherwise, we have work to do," Warsh said.

Warsh's message caused investors to increase their expectations for the Federal Reserve to raise interest rates. Since then, oil prices have risen further after U.S. forces struck Iran for the first time in a month earlier this week, prompting Iranian retaliation.

Middle East tensions kept the price of Brent crude oil above $90 per barrel, with Brent trading 2.4% higher at $92.65.

"[The] bond rout deepens," said Christoph Rieger, head of rates and credit research at Commerzbank in a note.

Warsh provided clarity that bringing inflation back to target is his undisputable priority. U.S. money markets priced a 65% probability of a rate increase on Sept. 16, having priced around a one-third possibility prior to Warsh's speech on Friday, according to LSEG.