Global sell-off in government bonds rattles investors

The math on government debt is getting uncomfortable, and bond markets are making sure everyone knows it. A sweeping global sell-off in government bonds has pushed long-term yields to levels not seen in more than a decade, raising borrowing costs for everyone from homebuyers in Ohio to sovereign treasuries in Tokyo.

The numbers are hard to ignore

US 10-year Treasury yields climbed to approximately 4.78%, the highest since January 2025. The 30-year Treasury yield pushed past 5.3%, a level the market hasn’t touched since 2007, back when the phrase “subprime mortgage” was just entering the public vocabulary.

The sell-off isn’t a US-only phenomenon. Japan’s 10-year government bond yield hit 3%, the highest since 1996, a striking move for a country that spent the better part of three decades fighting deflation. UK gilt yields surpassed 5.2%, a mark last seen in 2008. German and French long-term yields reached their highest points since 2011 and 2008 respectively.

A Bloomberg gauge tracking global government bond yields rose to 3.72%, the highest since mid-2008.

Two forces are doing most of the damage. First, oil prices surged above $90 per barrel in August amid escalating US-Iran military tensions, reigniting inflation fears that central banks had spent years trying to cool. Second, expectations have built that the Fed could raise rates again as early as September, a prospect that makes existing long-term bonds look less attractive almost immediately.

Why the bond market affects everything else

When 30-year Treasury yields exceed 5.3%, the ripple effects move fast. Mortgage rates track long-term Treasuries closely, so homebuyers face steeper monthly payments. Corporate borrowing becomes more expensive, which tends to compress profit margins and slow hiring. The discount rate used to value future earnings in equity markets rises, which mechanically pushes stock valuations lower, particularly in growth-oriented sectors like technology.

Real estate feels the pinch most acutely. Higher rates increase cap rates on commercial property, which pushes asset values down even when underlying business fundamentals haven’t changed.

Total US national debt surpassed $40 trillion by August 2026. At 4.78% on 10-year debt, the annual interest bill on that pile grows with every refinancing cycle. Net foreign private demand for US Treasuries fell to $16.6 billion in June 2026, suggesting overseas appetite for American debt is softening precisely when supply is increasing.

The US Treasury has responded by announcing it will double its long-bond buyback operations to at least $4 billion per operation, a move designed to provide some liquidity support to a market showing signs of stress.

What investors are actually doing about it

The instinct in a rising-yield environment is to shorten duration — hold bonds that mature sooner, so you’re not locked into today’s rates for decades. Short-duration bonds lose less value when yields rise because they reprice to current rates faster.

Japan’s yield spike is particularly significant because Japanese investors have historically been among the largest buyers of foreign bonds, including US Treasuries. When Japanese yields become more competitive domestically, some of that capital tends to stay home, reducing one of the traditional stabilizing forces in the Treasury market.

European yields rising to post-2008 levels create a similar dynamic. Higher yields at home mean less incentive to reach for return by buying US or emerging market debt, tightening financial conditions globally without the Fed or ECB having to do anything additional.

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