Why did Treasury yields hit multi-decade highs?
Long-term U.S. yields climbed to levels not seen in decades as Hormuz risk and oil near $91 pushed mortgage and loan costs higher for families.
Borrowing costs just moved back into territory families have not seen in a generation.
CNBC reported Tuesday morning that a global government-bond sell-off pushed long-term yields to multi-decade highs after the U.S.-Iran deal window closed without a breakthrough. At 7:38 a.m. ET, the 30-year U.S. Treasury yield was up almost 3 basis points to 5.335%, the highest level since 2002. The 20-year yield hit a post-2006 high, and the 10-year yield was last seen at 4.748%, its highest since 2007.
Those are not abstract bond-desk ticks. Lenders use the 10-year Treasury as a guidepost for mortgages, auto loans, and business credit. When that yield climbs, monthly payments climb with it. Associated Press reported Monday that the 10-year yield had already risen to 4.72% from 4.68% late Friday, and from 3.97% before the war with Iran. AP also said the average long-term U.S. mortgage rate has jumped near its highest level in a year.
Oil is the accelerant. AP said Brent crude rose 2.7% on Monday to $90.87 a barrel and was higher again early Tuesday near $91.35, with U.S. crude around $85. Higher fuel costs feed inflation fears, bond investors demand higher yields, and shelter and credit get more expensive for families who never trade a bond.
Overnight news did not break the loop. AP reported that a projectile hit a ship sailing out of the Strait of Hormuz early Tuesday, damaging the engine room and causing a crew casualty, according to the British military's UK Maritime Trade Operations center. Iranian parliamentary speaker Mohammad Bagher Qalibaf said Tehran would keep its grip on the waterway until Washington meets conditions including lifting the blockade, releasing frozen assets, ending oil sanctions, and ending military operations.
The pressure is global. CNBC said Germany's 10-year bund yield was at a 15-year high, France's was at its highest since 2008, and Japan's 10-year yield rose to 2.941%, topping a 40-year high from the spring. AP said the S&P 500 fell 0.5% on Monday as oil accelerated. CNBC said U.S. futures were lower again Tuesday. Home Depot beat second-quarter expectations but kept full-year guidance unchanged in what CFO Richard McPhail called "frozen housing market" conditions, with customers still worried about inflation and fuel.
What would change the story is simple: a durable Hormuz reopening that pulls oil lower, clearer cooling in long-term inflation expectations, or several sessions of falling 10-year and 30-year yields. Until then, long-term money got more expensive again, and families pay that bill through mortgages, car loans, and the cost of keeping a business open.