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US MBA Purchase Index Falls for Two Consecutive Weeks, Surging Mortgage Rates Hit Housing Demand Hard

2026-10-15

Core Overview: According to the latest data provided by DataTrack, the US MBA Purchase Index in Q4 2026 (as of October 9) was 139.3, a significant drop from the previous 145.1. This marks the second consecutive week of decline for the index, dropping to a recent relative low. Against the backdrop of climbing market interest rates, buying momentum in the US housing market is facing a severe test.

Key Details: Observing the market breakdown data, the 30-year fixed mortgage rate has recently surged to 7.5%, marking the highest level since November 2023. Faced with high funding costs, homebuyers are turning to adjustable-rate mortgages (ARM) in order to lower their initial monthly payments. Currently, the share of ARMs in total mortgage applications has climbed to 10.5%, hitting a new high since October 2025.

In-Depth Attribution: Regarding the rapid cooling of homebuying intentions, Joel Kan, MBA's Vice President and Deputy Chief Economist, pointed out that the recent rise in US Treasury yields has directly pushed up mortgage rates. The sharp jump in borrowing costs has significantly worsened housing affordability for potential buyers. This has forced many end-user and investment buyers to temporarily exit the market, subsequently causing a significant shrinkage in overall mortgage applications.

Outlook and Risks: In the short term (1-2 months), as mortgage rates remain stubbornly high, existing and new home sales will continue to face pressure, and the housing market is expected to fall into a cooling period of shrinking volumes and wait-and-see attitudes. In the medium term (3-6 months), the key catalysts lie in the Federal Reserve's subsequent moves and inflation trends. If long-term Treasury yields can smoothly retreat, deferred housing demand is expected to be released; conversely, if the timing of interest rates peaking is delayed, it will pose the greatest risk to the housing market's recovery.

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