hard · Asset-Backed Securities

An ABS waterfall has sequential OC release: overcollateralization steps down on scheduled dates ONLY if (i) the OC target is met and (ii) a cumulative-loss trigger and a delinquency trigger are both passing. Consider a month where the OC actual exceeds target and the cumulative-loss trigger passes, but the rolling delinquency trigger fails. The structure pays senior interest, then senior principal to target, then — if all release conditions pass — releases the OC surplus to the residual; otherwise surplus is trapped as additional senior principal.

What is the correct cash-flow consequence this month, and its effect on senior WAL?

  1. The release is blocked, so the surplus turbos into senior principal, shortening senior WAL relative to a clean-release month
  2. The release proceeds because OC and the loss trigger pass, and a delinquency-only failure does not block a release once OC is above target
  3. The surplus is split: half released to the residual and half trapped, since only one of two triggers failed
  4. The surplus is held in the reserve account rather than applied to senior principal, leaving senior WAL unchanged this month

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