In previous posts, we discussed the trends in Ginnie Mae MBS issuance by loan purpose. Recall that the decision to buy a loan out of a Ginnie pool rests with the servicer. As such, this decision is dependent in part on environmental factors that impact the profitability of this action, notably the interest rate. As loans get bought out at par, there is a greater incentive to purchase loans out of pools and get them into reperforming status when rates are low than when they are high. This relationship can be clearly seen in the following graphs:
Analyzing trends in market performance requires two things, 1) a lot of data, and, 2) a deep understanding of the structure of markets. We recently came across a good example of this with relative delinquency rates between GNM and GSE pools. In this post, we look at the dynamics of the two categories of reperforming mortgage loans.
Investors have spent many years building models of prepayment speeds for mortgage pools based on a variety of characteristics such as loan size and underwriting characteristics. However, institutional factors can come into play as well. One that comes to mind is the difference in program structure between conventional and government loans. For the conforming market, the issuer is a GSE, while for government programs, it is the servicer. In both categories, when a loan becomes seriously delinquent, it can be bought out of the pool at par, amounting to a prepayment. The difference is that for the case of conforming loans, it is the quasi-public GSEs that perform this function, while for government programs, the decision is up to private sector entities. In the first case, there are overarching policy goals that weigh on decisions about the disposition of loans in delinquency, while in the second case, these decisions are based on financial considerations.
One way to test this is to look at buyouts over the interest rate cycle. Below find a chart containing the shares of reperforming loans in new issuance for FHA, VA and the GSEs. These are loans that have been previously bought out of pools and then reissued into new pools. There can be a substantial lag between the buyout and re-issuance.