The ongoing war with Iran is significantly increasing the cost of borrowing for Americans, impacting everyday expenses. Mortgage rates, which had fallen below 6% in late February to 5.98%, climbed to 6.37% after the conflict began, adding over $36,000 to the total cost of a $500,000 home loan over 30 years. This rise is largely attributed to increased yields on 10-year US Treasuries, influenced by investor concerns over inflation and potential war-related government spending. While auto loan rates have not seen immediate significant increases, higher Treasury yields suggest they may remain elevated. Credit card rates, already above 19%, are unlikely to decrease soon as traders anticipate the Federal Reserve holding interest rates steady due to inflation fears fueled by rising energy costs.