Portable mortgages are an idea that makes sense...maybe. The concept is simple. You get a home loan at a 30-year fixed rate. If you lock-in when rates are low, you keep that rate for the life of the loan and transfer the loan to a new property.
Borrowers would love it because it makes them feel that the loan they "earned" stays with them forever. Secondary markets (the ultimate purchaser of most loans) and banks, won't love this idea.
Portable mortgages are available in Canada. E-Trade Financial experimented with this loan product in 2003. They charged borrowers a rate premium of .375% to guarantee that portability. That means that if the "market rate" was 5.5% in 2003, the borrowers who optioned to take the portable mortgage, received a rate of 5.875%.
The rate premium was charged to appease the secondary markets by providing them the extra money to hedge the interest rate risk. The interest-rate risk for the investors could be hedged through mortgage derivatives or a collared options strategy. I'm not exactly certain how that strategy will work so I'm asking Pat Kitano to comment; he was a capital markets guy on Wall Street (I was a consumer markets guy) so he might have an interesting take for us money geeks.
What are some of the problems ?