Why do sub-3% assumable mortgages matter?

A loan locked well below today's going rates is worth carrying forward instead of paying off, which is exactly why an assumable mortgage in that range draws serious buyer interest. Assuming that rate instead of originating a new loan can lower a buyer's monthly payment by a meaningful margin, which widens who can afford the home. Sellers holding one of these loans can lean on it as a genuine selling point in marketing. Confirm assumability with the loan servicer before advertising it that way.