President Trump’s portable mortgage push may let you keep your 3% rate — experts say it might backfire. What to do now

A new Yahoo Finance feature highlights insights from Penn IUR Co-Director and Wharton professor Susan Wachter, who notes that allowing homeowners to carry ultra-low mortgage rates (many below 4%) to new properties could unlock long-stalled housing mobility.

But the policy is not without risk. While portability may encourage existing homeowners to sell, it could also drive up demand—and prices—without meaningfully improving affordability or access for first-time buyers.

As Wachter’s perspective underscores, interventions in the housing finance system must balance mobility with market stability.

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