US Borrowing Costs Hit Highest Level Since 2004

America's cost to borrow money for 30 years rose to 5.444% on September 24, 2026, the highest since 2004, as investors sold government IOUs around the world. Like higher mortgage rates for Washington, that makes US debt costlier and borrowing tougher globally. Investors are watching how long they will insist on higher pay to hold that long-term debt.