The 30-year U.S. Treasury yield reached 5.34 percent in mid-August, a level last seen in 2007 before the global financial crisis, before pulling back to around 5.17 percent. The move reflects a broad repricing of sovereign debt across the world's largest economies, driven by three converging forces: ballooning government deficits, Middle East conflict pushing energy prices higher, and growing investor doubt that any major government will bring spending under control.
The structural driver is debt accumulation that predates the current cycle by nearly two decades. Public debt has grown around the world since the 2008-2009 financial crisis, according to Frederik Ducrozet, head of macroeconomic research at Pictet. The Covid pandemic, the start of the Iran war and trade wars produced a series of shocks requiring massive spending responses, each leaving governments with higher baseline debt than before.
U.S. government debt topped $40 trillion for the first time this month—double the total from 10 years ago. Debt-service costs have expanded in direct proportion, consuming budget capacity that would otherwise fund other spending. As Washington issues more bonds to cover wider deficits, the global pool of buyers demands higher yields to absorb the supply.
Europe shows the same pattern with country-specific amplification. Germany's benchmark 10-year bund yields around 3.22 percent, a rate not seen since 2011. France, where the government is managing spending cuts ahead of next year's presidential election, shows a 10-year OAT yield of 4.05 percent—the highest since 2008 and well above the 3.5 percent level at the start of this year. Even countries that usually tighten their belts, like Germany, are now seeing their deficits climb, according to Charlotte de Montpellier, an economist at ING.
Japan, which spent years with yields near zero while fighting deflation, has joined the global reset. The 10-year Japanese government bond yield jumped to nearly 2.9 percent from 2.1 percent in February—a move of roughly 80 basis points in under seven months. For a market long anchored to zero, the shift represents a fundamental change in the cost of Japanese sovereign borrowing.
The competition for capital extends beyond governments. Technology companies are borrowing heavily to fund artificial intelligence infrastructure, putting them in direct competition with sovereign issuers for the same global fixed-income pool. Governments are now competing among themselves to attract capital, which forces each to offer higher rates than they otherwise would. The AI borrowing wave adds a private-sector dimension to that competition.
Yields on bonds already trading in the secondary market effectively set the floor for what governments pay on new issuance. When the 30-year Treasury trades at 5.17 percent, Washington cannot expect to issue new 30-year debt at a materially lower rate. The same dynamic applies across European capitals. France's OAT yield rising from 3.5 percent to 4.05 percent since January means the French government is paying significantly more to roll over maturing debt and fund any new borrowing.
U.S. Treasuries have historically commanded a premium from global investors as the world's default safe-haven asset, allowing Washington to borrow at rates below what comparable deficits would imply elsewhere. That premium is now compressing. The 30-year yield at 5.17 percent sits well above the levels that prevailed for most of the post-2008 period, suggesting the market is reassessing how much of a safety discount Treasuries deserve as debt loads grow.
The counterargument to sustained high yields rests on central bank action. If the Federal Reserve responds to slowing growth by cutting rates, long-end yields would likely follow. But stubbornly high inflation—partly a product of energy price increases tied to the Middle East conflict—has narrowed the Fed's room to ease. European central banks face the same bind: services inflation in the eurozone has not retreated to target, and lower energy costs remain contingent on a conflict that shows no sign of resolution.
The 10-year French OAT at 4.05 percent and the 10-year German bund at 3.22 percent mark a visible break from the post-2012 European low-rate era that followed the eurozone debt crisis. During that crisis, peripheral European spreads over German bunds blew out. Now, even the core—France and Germany—trades at rates that a decade ago would have been considered stress levels. The 80-basis-point gap between the French and German 10-year yields reflects investors' judgment that French fiscal consolidation is behind schedule, with a presidential election next year limiting the government's appetite for cuts.
