The American housing market received another blow in early October as the average rate on a 30-year fixed mortgage climbed to 7.49 percent, its highest level since November 2023. According to the Mortgage Bankers Association, the rate rose 19 basis points during the week ending October 2 and has now increased for seven consecutive weeks.

Mortgage rates had already been elevated while home prices remained near record levels, leaving prospective buyers squeezed from both directions. Mortgage applications fell 4.2 percent in the latest week, illustrating how quickly higher borrowing costs are discouraging consumers from purchasing or refinancing homes.

Rising mortgage rates likely means fewer Americans can afford to buy homes. A higher mortgage rate sharply increases the monthly payment on the same house. Recent estimates indicate that the rise in rates has added hundreds of dollars per month to payments on a typical $400,000 mortgage compared with rates a year earlier. Meanwhile, purchase mortgage applications have declined, and refinancing activity has collapsed because millions of existing homeowners already have mortgages at considerably lower rates.

That creates what economists sometimes call a ‘lock-in’ effect: homeowners with 3 or 4 percent mortgages hesitate to sell because buying another property could require financing at more than 7 percent. The result is fewer transactions and an increasingly stagnant market. The main reason mortgage rates have increased is the sharp rise in long-term U.S. Treasury yields. Mortgage rates generally move with the yield on the 10-year Treasury rather than directly with the Federal Reserve's short-term interest rate.

Investors have been demanding higher yields because of persistent inflation, rising government borrowing, and geopolitical instability. Higher oil and energy prices associated with the war involving Iran have added to inflation concerns, while stronger than expected economic data has made investors believe the Federal Reserve may need to keep monetary policy restrictive or raise rates further. The 10-year Treasury yield has climbed above 5 percent, reaching levels not seen in decades.

Borrowers entering the market now face difficult choices. Some are buying less expensive houses, making larger down payments, or delaying purchases altogether. Others are turning toward adjustable-rate mortgages, which offer lower introductory rates but expose borrowers to the possibility of higher payments later.

Adjustable-rate loans now represent more than 10 percent of applications, reflecting how desperate some buyers have become to lower initial borrowing costs. First time buyers are particularly vulnerable because they generally have less home equity or accumulated wealth available for large down payments.

The political implications of higher mortgage rates could be substantial as the November 3 midterm elections approach. Housing costs are part of a broader affordability problem involving food, energy, insurance, and other household expenses. A recent Reuters/Ipsos poll found President Donald Trump's approval rating at 32 percent, while cost-of-living concerns were among the strongest factors shaping voter dissatisfaction. Democrats currently lead Republicans among registered voters nationally, although individual congressional races remain much closer.

Mortgage rates alone are unlikely to determine the election. But if rates remain near or above 7 percent through Election Day, the housing affordability crisis could reinforce a broader perception that living standards are becoming more expensive. For Republicans, who control the White House heading into the midterms, that creates an especially serious political risk. Voters frequently punish the party in power when major household expenses are rising, regardless of how complicated the economic causes may be.