by Tanta on 6/18/2007 11:39:00 AM

Everybody's all fired up about this report this morning from Fannie Mae's Berson's Weekly Commentary. I'm not, frankly, sure why; the insight about prepayments (specifically, refinance options) and subprime loan performance is not exactly news. But it does include a nice chart, helpful for those who don't tend to think in terms of mortgage flows.




The pie on the left represents 2/28s closed in late 2003 to late 2004 (which gives them a first payment adjustment date in calendar year 2006). The pie on the right represents 2/28s closed in late 2004 to late 2005. The clear implication is that delinquency and default in the earlier vintage was mitigated by refinance (or home sale) opportunities that are sorely lacking in the later vintage.

One has to remember, though, that separating the vintages like this does not mean the two pie charts include two mutually-exclusive groups of borrowers. Because these are two sequential years and the loan type in question is a 2/28, it is likely that most of the refinances of the earlier vintage do not appear as new loans in the later vintage; they would appear in a "future" pie with a reset in 2008 (or later). The point, though, is that what you see in the left-hand pie, for instance, is a very big pile of refinances that were originated in 2006, a year notorious for wretched underwriting guidelines. The slowing of the prepayments in the right-hand pie suggests that that party's over, but it also clearly means that we still have a lot of loans that "rolled" to a new loan in 2006 and 2007 and that may or may not have an escape route in 2008 or 2009 when the next reset problem arises.