Why is a sub-4% mortgage an asset right now?

A loan rate held well under what lenders are quoting today functions like a financial asset, since it lowers the true cost of keeping the home compared with buying it again at current rates. That gap is part of why some owners are choosing to rent out a home rather than sell it. Anyone assuming that loan through a sale, where eligible, also inherits real payment savings. Weigh that advantage against your own plans with your lender before deciding what to do with the house.