Government bond yields surged across major markets on Tuesday, with borrowing costs in Japan and the United Kingdom reaching multi-decade highs as renewed hostilities in the Middle East pushed energy prices higher and revived concerns that inflation could remain elevated.

The selloff extended across the United States, Europe and Asia, highlighting a growing challenge for central banks and governments already grappling with persistent price pressures, large fiscal deficits and heavy borrowing needs.

The U.S. 10-year Treasury yield rose 3 basis points to 4.788%, its highest level in 20 months. The move came after Federal Reserve Chair Kevin Warsh’s hawkish comments last week reinforced expectations that U.S. interest rates may need to remain higher for longer, particularly if inflation fails to move decisively toward the Fed’s 2% target.

Japan saw one of the sharpest moves. The benchmark 10-year Japanese government bond yield climbed more than 6 basis points to 3%, a level not seen since 1996. The two-year yield also reached 1.81%, its highest since 1995.

The increase marks a significant shift for Japan, where government bond yields spent years at exceptionally low levels as the Bank of Japan maintained ultra-loose monetary policy. The rise now reflects expectations that the central bank may need to continue raising rates as underlying inflation approaches its 2% objective.

In Britain, the 10-year gilt yield jumped more than 9 basis points to 5.234%, its highest since June 2008. The 30-year yield also climbed 9 basis points to 5.886%, its highest since March 1998.

German 10-year Bund yields, a key benchmark for eurozone borrowing costs, rose more than 3 basis points to 3.355%, a fresh 52-week high. The two-year Bund yield reached 2.950%, its highest since July 2024, while France’s two-year borrowing cost rose to its highest level since April 2024.

The synchronized rise in yields is significant because it indicates that investors are demanding greater compensation to hold government debt across economies, rather than the pressure being confined to one country’s fiscal or monetary outlook.

Oil Shock Adds to Inflation Concerns

The latest bond selloff was intensified by renewed U.S.-Iran hostilities around the Strait of Hormuz, a critical route for global energy supplies.

Brent crude, the global benchmark, rose about 2.2% to $92.38 a barrel, while West Texas Intermediate gained 2.61% to $88.05. Higher energy prices can feed directly into consumer inflation while also increasing production and transportation costs across the economy.

The combination presents a difficult policy environment for central banks. Higher oil prices can keep inflation elevated when economic growth may be weakening, limiting the scope for policymakers to cut interest rates.

For bond investors, the concern is especially acute in the United States because inflation risks are emerging alongside a large federal deficit and substantial government borrowing requirements.

Treasury Secretary Scott Bessent sought to play down concerns about the rise in U.S. yields, saying Monday that the U.S. bond market remained “the best performing market” in the world. He also pointed to Fitch Ratings’ reaffirmation of its AA+ rating on U.S. government debt.

But Steve Englander, head of global G10 FX research and North America macro strategy at Standard Chartered, took a less sanguine view.

“I think ‘best performing’, as Bessent said, isn’t the same as well performing,” Englander told CNBC. “Everybody has a deficit problem. I don’t think there’s any reason to cheer.”

Englander said the prolonged Middle East conflict, combined with the impact of a Supreme Court tariff ruling that he estimated removed about 40% of additional tariff revenue, would keep pressure on the U.S. bond market.

Warsh Raises The Stakes for The Fed

The rise in Treasury yields also comes days after Warsh signaled that the Federal Reserve could raise interest rates if it fails to gain sufficient confidence that inflation is moving toward its 2% target.

At the Jackson Hole symposium on Friday, Warsh said the Fed would “have work to do” if underlying inflation was not moving toward its objective “clearly and at sufficient speed.” The comments marked his strongest indication so far that additional monetary tightening could be necessary. Markets have subsequently increased bets on a September rate hike.

Higher Treasury yields can weigh on equities by making bonds more attractive relative to stocks and increasing the discount rate applied to future corporate earnings. They can also raise financing costs for businesses and households, potentially slowing investment and consumption.

Gold Hit By Rising Yields

The global bond selloff also weighed heavily on gold. Spot gold fell 1.8% to $4,369.24 an ounce by 1003 GMT, its lowest level since August 19. U.S. gold futures declined 1.4% to $4,418.

Gold had climbed to a more than three-month high last week before dropping more than 3% on Friday following Warsh’s Jackson Hole remarks.

The relationship between gold and bond yields has become increasingly important. Higher Treasury yields increase the opportunity cost of holding gold, which does not generate interest income. Rising real yields can therefore weaken demand for the metal, particularly among institutional investors.

Saxo Bank analyst Ole Hansen said global bond yields were continuing to rise after Warsh’s hawkish comments, adding pressure to gold prices.

Other precious metals also fell, with silver down 2.8% at $64.64 an ounce, platinum declining 1.9% to $1,760.13 and palladium slipping 2.2% to $1,327.

Fiscal Pressure Compounds Monetary Risks

The bond selloff is occurring against a broader backdrop of rising government debt and fiscal deficits in major economies.

In the U.S., investors are assessing whether the Treasury can contain borrowing costs while financing a federal debt burden that has surpassed $40 trillion. In Britain, long-term yields are approaching levels that could increase the government’s debt-servicing costs and constrain fiscal policy.

The U.K. move also comes as Prime Minister Andy Burnham is reportedly considering legislation that would make it easier to bring struggling utilities into public ownership, according to The Guardian. The prospect of greater government involvement in the economy adds another dimension to investors’ assessment of Britain’s fiscal outlook.

For Japan, the rise in yields carries a different but equally important implication. The world’s most heavily indebted major economy is moving away from an era of near-zero interest rates, meaning higher borrowing costs could gradually increase the government’s debt-servicing burden.

The common thread across the major bond markets is that investors are confronting a combination of inflation risk, elevated energy prices, large fiscal deficits, and changing expectations for monetary policy.

That makes upcoming U.S. labor-market data particularly essential. Evidence of resilient employment alongside persistent inflation could strengthen the case for higher-for-longer interest rates and keep pressure on government bond yields upward. A deterioration in the labor market, however, could revive expectations for monetary easing and provide some relief to bonds.