U.S. credit downgrade, Trump tax bill shake global bond markets

Global bond markets are reeling under mounting fiscal concerns as investors flee long-duration debt following a fresh U.S. credit downgrade and renewed anxiety over President Donald Trump’s sweeping tax proposal. The result is a broad-based selloff shaking markets from Washington to Tokyo and Berlin.
The latest catalyst is Moody’s recent downgrade of the U.S. sovereign credit rating, which coincided with the unveiling of Trump’s much-anticipated tax bill — a plan expected to add an eye-watering $3 trillion to $5 trillion to the U.S. deficit over the next decade. Together, these developments have triggered panic in the bond market, with yields on U.S. Treasurys and other major global bonds soaring.

The benchmark 30-year U.S. Treasury yield broke above 5% for a second consecutive day, hitting 5.088%, its highest since late 2023. The 10-year yield jumped more than 15 basis points this week alone. Analysts say this is being driven by a rapid repricing of long-term fiscal risk.

“Markets do not find Trump’s ‘big, beautiful tax bill’ beautiful at all. Treasurys were beaten up in an ugly sell-off,” Vishnu Varathan of Mizuho Securities commented. Adding fuel to the fire is the recent exodus from U.S. assets — a trend that began in April and has now spread across global markets. This time, investors aren’t fleeing into other developed markets as safe havens. Instead, they are pulling back from bonds altogether.

Japanese bonds, long viewed as a conservative refuge, are also seeing aggressive selloffs. Japan’s 40-year government bond yield spiked to a record 3.689%, while the 30-year yield hovered at 3.187%. The 10-year yield surged 9 basis points to 1.57% this week.

A major factor in Japan’s bond turmoil is structural. Regulatory shifts have reduced the need for Japanese life insurers to hold long-term bonds, weakening a key pillar of demand. Meanwhile, the Bank of Japan is signaling a tightening stance, placing additional pressure on yields.

In Europe, German bunds are under strain as well. The 30-year bund yield has risen by over 12 basis points, with 10-year yields climbing 6 basis points. The bond rout in Germany has been exacerbated by the removal of the country’s fiscal “debt brake” and increasing military spending — signs of a broader move away from austerity across the continent.

“The common thread across all these markets is a growing unease with worsening fiscal trajectories,” said Rong Ren Goh, Portfolio Manager at Eastspring Investments. “Investors are reassessing the term premium required to hold long-dated bonds.”

The sell-off reflects a fundamental shift in how investors view government debt. With inflation fears still simmering and budget deficits ballooning, longer-dated bonds — once a staple in conservative portfolios — are being dumped in favor of cash or shorter-term debt.

Steve Sosnick, Chief Strategist at Interactive Brokers, summed it up: “Investors don’t really have much love for long-duration bonds right now.”

Interestingly, bonds in India and China have largely avoided the rout. The 10-year bond yields in both countries edged slightly lower this week. Analysts attribute this to the relatively insular nature of their markets, backed by strong domestic demand and capital controls that shield them from global volatility.

“Foreign investors and global factors are far less relevant determinants for their respective yield curves,” said Philip McNicholas of Robeco.

With Washington’s fiscal path in question, geopolitical instability simmering, and major economies drifting from their long-held monetary policies, global bond markets appear to be entering a new era of uncertainty.

Unless confidence in long-term fiscal responsibility is restored, analysts warn that this bond market volatility may be just the beginning.