
True "prime" loans are 45% of the money - and by definition, since they are "conforming" can't have IO/neg-am features.
so what's at risk is the other 55%, and only 12% of the money is in Jumbos.
Neg-Am and IO as % of total $ = 21.6%
Subprime - 4.6%
Alt-A - 12.4%
Jumbo - 4.6%
Prime - 0%
Personally, I would argue that Option-ARM and IO loans are less susceptible to payment default than straight ARMs. A 10 year IO loan locks in a pretty low payment for a long time. The owner may end up under water on the property, but are they are less likely to walk away because they cannot make the payment. I think the riskiest loans are the 2/28 sub prime ARMs, which we are seeing reset right now. I doubt you will see default rates as high as we are seeing on these loans for any other class of lending.