10-Year Treasury Yield Above 4.3 Percent Pushes 30-Year Mortgage Rates Toward 7 Percent

Bond market pricing now embeds higher term premiums after the Treasury increased issuance to fund deficits exceeding 6 percent of GDP. Primary dealers absorbed larger auction sizes while foreign buyers reduced participation, forcing domestic rates higher without corresponding Fed balance-sheet expansion. Mortgage-backed securities spreads widened 12 basis points over the past month, transmitting the yield rise directly into borrower costs.

The Federal Open Market Committee minutes from September show participants viewed inflation risks as balanced only if labor-market cooling continues at the current pace. A 50-basis-point cut priced for December would still leave the policy rate above 4.25 percent, insufficient to offset the fiscal impulse. Households with adjustable-rate mortgages face immediate resets, while new fixed-rate borrowers absorb the full duration cost of elevated yields.

Savers gain from higher deposit and money-market returns that now exceed 5 percent, shifting capital away from housing toward short-duration instruments. Borrowers lose access to refinancing, extending the average mortgage duration and reducing housing turnover. This incentive shift favors banks holding floating-rate assets over originators dependent on volume.

Next data points are the October CPI release and the Treasury's quarterly refunding announcement. Either a hotter inflation print or larger-than-expected coupon supply would extend the selloff, locking mortgage rates above 7.5 percent into the first quarter of 2025.