US borrowing costs hit fresh highs over inflation fears

Borrowing costs in the United States reached an all-time high on Tuesday, as Middle East strikes drove up oil prices and heightened worries about inflation. The effective interest rate on borrowing over a decade reached 4.79%, the highest since January 2025, due to oil prices exceeding $92 a barrel. These global bond market movements impact the rates at which the U.S. government borrows money, and affect mortgage, car loan, and credit card interest rates too.

This surge in borrowing costs comes amid fears that inflation has been persistently high for five years, prompting the Federal Reserve to consider raising interest rates. Governor Michael Barr warned that if inflation does not cool down, decisive rate hikes may be necessary. Fed Chairman Kevin Warsh echoed this sentiment, stating that policymakers would have to act if they were not confident that cost-of-living pressures were easing for Americans.

Inflation has been a source of concern for both the Federal Reserve and global investors, leading to increased bond yields as investors demand higher returns for bearing inflation risks. Governments borrow by selling bonds, promising to repay with interest, and bond investors demand higher yields when inflation is high or expected to rise.

The U.S. national debt has surpassed $40tn, a two-decade doubling under both Trump and Biden administrations, and 30-year mortgage rates have hit a one-year high of almost 6.7% as a result of these rising borrowing costs.