Internal and External Credit Enhancements
Because most mortgage-backed securities have higher credit quality collateral than non-mortgage ABS, many non-mortgage ABS offer credit enhancements to make their risk level more tolerable to investors.
Credit enhancement can be internal or external.
Internal Credit Enhancements
- Cash Reserve Accounts: ABS issuer sets aside a portion of the fees earned in the security underwriting process, so this cash is available to draw upon if necessary.
- Excess Servicing Spread Accounts: This spread creates an additional basis point buffer beyond the servicing fee between the gross weighted average coupon of the assets and weighted average coupon paid to ABS investors. This excess spread is deposited into an account and is available to draw upon if necessary.
- Overcollateralization: The value of the assets supporting an ABS is greater than the outstanding principal owed to bond investors. Therefore, in the event of a default, excess assets can be used to pay ABS investors.
- Senior/Subordinate Structure: More than one tranche is issued for the asset pool and in the event of a default; the subordinate tranches absorb losses before the senior tranches do.
External Credit Enhancements
Commonly, external credit enhancements are third party employed measures to back up the internal credit enhancements.
- For example, bond insurance could be purchased for the asset pool from an insurance company.
- Keep in mind that if the credit quality of the third party insurer or guarantor declines, then the credit quality of the ABS will decline as well.
- Collateralized Mortgage Obligations (CMO) and CMO Tranches
- Stripped MBS – Interest Only (IO) and Principal Only (PO)
- Residential Non-Agency MBS
- CMBS: Structure and Call Protection
- Amortizing Loans vs. Non-Amortizing Loans
- Overview of Asset Backed Securities (ABS)
- Internal and External Credit Enhancements
- Pay-through Structures: Prepayment Tranching vs. Credit Tranching
- Home Equity Loans (HEL) Backed Securities
- Manufactured Housing Backed Loans
- Auto Loans Backed Securities
- Student Loan Backed Securities (SLABS)
- SBA Loan Backed Securities
- Credit Card Receivable Backed Securities
- Collateralized Debt Obligations (CDOs) and Synthetic CDOs
- Cash Flow Yield, Nominal Spread, and Zero Volatility Spread for ABS/MBS
- Monte Carlo Simulation for ABS/MBS
- CFA Level 2: Fixed Income Part 2 – Introduction
- Duration and Convexity for ABS/MBS
- Mortgage Cash Flow Characteristics
- Choosing an Appropriate Spread for ABS/MBS
- Mortgage Pass-through Securities: Characteristics and Risks
- Cash Flows and Prepayment Risk
- Single Monthly Mortality (SMM) & Conditional Prepayment Rate (CPR)
- PSA Prepayment Benchmark
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