When an Event of Default is declared and not cured within the permitted window, the trustee — acting on instruction from the Requisite Noteholders (typically ≥25% of the outstanding principal balance of the controlling class) — can accelerate the notes. Acceleration means all principal and accrued interest across every class becomes immediately due and payable. From that point, the deal is in enforcement mode.

Enforcement doesn't happen all at once. The indenture spells out an ordered set of remedies. The trustee first attempts collections acceleration — directing all collections to senior noteholder paydown in strict priority, halting reinvestment in the case of revolving pools. If collections alone are insufficient, the trustee can instruct the servicer to liquidate the collateral pool — selling assets in the secondary market. The proceeds are distributed down the waterfall exactly as in normal operations, except there is no more reinvestment and no equity residual until all notes are paid in full.

The legal mechanism matters enormously. In a true sale structure, the SPV's assets are not available to the originator's bankruptcy estate, so enforcement happens cleanly. In a pledged collateral structure (common in private credit warehouse facilities), the lender has a security interest over the collateral and takes possession via UCC foreclosure — a messier and potentially slower process. This is one reason why rated term deals nearly always use true sale: cleaner enforcement on default gives noteholders greater comfort and lowers the required credit enhancement.

The timing of recovery matters as much as the amount. A deal that recovers 90 cents on the dollar over 36 months returns far less in NPV terms than 85 cents in 12 months. Model assumptions about liquidation timing and recovery rates drive most of the stress scenario spread between investment-grade and non-investment-grade tranches.

Once a deal closes, the investor's job shifts from underwriting to surveillance. The question changes from "will this pool perform well enough to support the structure?" to "is it performing as expected, and are the structural protections intact?" Surveillance is the ongoing answer to that question.

The primary data source is the monthly investor report (also called the servicer report or trustee report). This document, produced by the servicer and certified by an officer, contains everything needed to run the waterfall, calculate covenant compliance, and assess pool health. The core sections are: (1) pool balance and composition, (2) collections and delinquencies, (3) waterfall calculation, (4) covenant compliance certificates, (5) reserve account balances.

Beyond the monthly report, sophisticated investors build their own surveillance models — spreadsheets or code that ingest report data, track metric trends, flag covenant proximity, and project forward scenarios. A deal that is "in compliance" today can breach a soft trigger in 3 months if CDR is rising at 0.3% per month — a model catches this; a simple reading of today's report does not.

Key metrics to track monthly: CNL ratio (cumulative net loss as % of original pool balance), delinquency ratio (30/60/90 day buckets), OC ratio (pool balance / note balance), payment rate (for revolving pools — monthly collections as % of pool), excess spread (yield minus cost of funding minus losses), and reserve account balance.

Trend analysis is more important than any single month's snapshot. A CNL ratio of 3.8% against a 7% trigger sounds safe — but if you plot the last 6 months, the picture changes:

At this trajectory (+0.3% CNL per month), the 7% soft trigger is ~10 months away. A sharp analyst flags this now — when there is still time to engage the originator on servicing improvements — not at month 10 when the trigger is imminent.

Rating agencies don't just assign a rating at closing — they monitor the deal throughout its life. This ongoing surveillance is contractually required by the indenture, which specifies that ratings must be maintained and that the issuer must provide the rating agency with monthly performance data. The rating agency's ongoing involvement creates both a protection (downgrade notices give investors advance warning) and an obligation (issuers must manage agency relationships and information flow carefully).

Typical monitoring triggers a formal Rating Review when: (1) performance metrics deteriorate significantly, (2) a structural event occurs (servicer replacement, trigger breach, EoD), or (3) the rating agency's own model assumptions change (e.g., new loss severity assumptions for the asset class). A Rating Review is placed "on watch for downgrade" — typically a 90-day window during which the agency requests updated information and may revise the rating.

A downgrade has direct economic consequences: some investors (insurance companies, pension funds) have rating-based mandates and must sell downgraded securities, creating forced selling pressure that can widen spreads. In revolving structures, a downgrade below a threshold can trigger early amortisation, forcing the deal into paydown mode. In warehouse facilities, a downgrade of the lender (not the deal) can trigger a commitment to find a replacement facility.

The key metric the rating agency monitors is whether the credit enhancement level is consistent with the current rating given the actual pool performance. If CNL is tracking above the assumed base case at the time of original rating, and CE has been eroding, the agency may determine the current tranche no longer supports an Aaa rating at the stress multiple applied at close.

Every ABS deal has a mechanism for early, orderly termination before the legal final maturity — the clean-up call. It's one of the most important economics provisions for the equity/certificate holder and often materially affects the IRR of the entire capital structure.

The clean-up call is a right (not an obligation) for the servicer, depositor, or certificate holder to redeem all outstanding notes once the pool balance has amortised below a specified threshold — typically 10% of the original pool balance. At that point, the remaining pool is small enough that the administrative costs of continuing to run the deal (trustee fees, servicer reporting, rating agency fees, legal compliance) may exceed the economic benefit of the remaining spread income.

To exercise the clean-up call, the calling party must purchase the remaining pool assets at par (or at market value if specified in the indenture) and use the proceeds to redeem all outstanding notes plus accrued interest. The deal is then terminated and wound down.

Why does this matter for IRR? Consider a deal where the pool has paid down to 9% of original balance and the remaining assets have a 3-year weighted average remaining term. Without the clean-up call, the certificate holder earns residual spread on a tiny pool for 3 more years — the cash flows are small and drag IRR down. With the clean-up call exercised, the certificate holder crystallises its position now, freeing capital for the next deal. The lift to IRR can be 50–200 basis points depending on the deal structure and timing.

The timing of when the pool crosses the 10% threshold determines whether the clean-up call is exercised at month 24, 36, or later. Faster prepayment (higher CPR) brings the threshold date forward, improving IRR for equity holders:

A private credit fund investing in ABS operates differently from a fixed income fund buying public securities. The fund participates across the capital structure — sometimes as note investor (providing capital), sometimes as originator partner (structuring the deal), sometimes as both. Each role creates different operational obligations that the fund's team must manage.

The key operational distinction is between warehouse phase and term-out phase. During the warehouse phase, the fund (or its lending vehicle) holds a portfolio of loans funded by a revolving credit facility from a bank. The fund's team manages the borrowing base daily — ensuring the portfolio meets the facility's eligibility criteria and advance rate calculations. A borrowing base deficiency must be cured within hours (typically same-day), either by adding eligible assets or repaying the facility. This is high-frequency operational work: daily data reconciliation, eligibility testing, advance rate recalculation.

At term-out, the warehouse loans are transferred into an SPV, notes are sold to investors, and the warehouse line is repaid. From this point, the fund's operational role shifts from daily borrowing base management to monthly surveillance reporting — reading investor reports, running covenant compliance checks, and managing the servicer relationship. This is lower frequency but higher analytical depth.

Funds that serve as the servicer on their own deals (common for specialty finance managers) have additional obligations: monthly data extraction from the loan management system, distribution of the investor report, certification by an authorised officer, waterfall calculation, and payment direction. A failure to certify the servicer report on time is a minor breach; an incorrect waterfall payment that short-changes a noteholder is a serious one.

Key operational metrics for a private ABS fund: borrowing base utilisation (warehouse capacity used vs. available), deal pipeline velocity (average time from warehouse origination to term-out), surveillance coverage (are all live deals being tracked monthly?), and operational exception rate (how often do servicer reports require manual correction?).