Mortgage Rate Lock-In Persists, Ultralow Rate Holders Unmoved

The U.S. housing market experienced a slowdown in its gradual thaw at the beginning of 2026, primarily due to a persistent "rate lock-in" effect. In the first quarter of 2026, approximately 49.9% of all outstanding mortgages in the U.S. were still held at rates of 4% or lower. Specifically, 19.5% of these mortgages were secured at ultralow rates of 3% or below, a figure that showed negligible change from the end of 2025, according to Realtor.com's economic research team. This indicates that a significant portion of homeowners are disinclined to sell or refinance, preferring to retain their historically low borrowing costs rather than face current market rates hovering around 6.5% or higher.

Conversely, the share of outstanding loans with rates at 6% or higher saw a modest increase of 0.1 percentage points in the first quarter of 2026, reaching 22.1%. This growth momentum was slower compared to the previous year. Realtor.com senior economist Hannah Jones attributed this stabilization to a brief period in February 2026 when mortgage rates dipped below the 6% benchmark. However, rates surged again due to geopolitical events, including a conflict between the U.S. and Iran, which led to rising oil prices and heightened inflation concerns. Jones explained that this environment likely allowed well-qualified buyers to secure mortgages below 6%, contributing to an increase in the share of mortgages between 5% and 6% and a plateauing of loans above 6%.

The distribution of mortgage rates across other brackets also showed minimal shifts between the fourth quarter of 2025 and the first quarter of 2026. The segment of mortgages with rates above 5% increased by only 0.3 percentage points, while the share of loans with rates between 3% and 5% decreased by 0.3 percentage points quarter over quarter. The sustained prevalence of low-rate mortgages and the slow growth of high-rate mortgages serve as clear indicators of the entrenched nature of the rate-lock bottleneck. This situation suggests that existing homeowners, particularly those with COVID-era rates, see no immediate need or opportunity to move, further constraining housing market activity.