hard · Asset-Backed Securities asset-nuances

A FFELP student-loan ABS (loans carrying a ~97-98% federal guarantee) and a private student-loan ABS are otherwise similar. An analyst observes that the FFELP deal's senior notes are rated AAA with strikingly THIN hard credit enhancement, yet the rating agencies' primary modeled risk for that FFELP senior bond is not default loss at all.

What is that primary modeled risk, and why is it the binding constraint?

  1. Basis and reset risk between the underlying loans' SAP-formula yield and the bonds' floating coupon, because a sustained index mismatch can quietly erode excess spread even though the guarantee still covers principal default losses
  2. Maturity (extension) risk: borrower use of deferment, forbearance, and income-driven repayment can stretch cash flows past the bonds' legal final maturity, causing a technical default despite near-full principal recovery
  3. Reinvestment risk on the guarantee claim proceeds, because lump-sum claim payments arrive irregularly and must be reinvested at uncertain short-term rates before being fully passed through to noteholders each period
  4. Servicer-disruption risk, because preserving the federal guarantee requires strict due-diligence servicing standards, and a single procedural lapse can void the guarantee on the loans that were mishandled

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