Good credit terms are engineered, not granted.
Credit enhancement is the quiet machinery of borrowing. When a town, a lender, or a pool of ordinary loans comes to market, something usually stands behind the promise to pay: collateral beyond the debt, a class of investors who agree to take losses first, a reserve of cash, a bank’s standby letter, an insurer’s policy. Those supports are what this site is about.
The purpose is practical. A borrower who can show a stronger promise borrows more cheaply, reaches investors who could not otherwise buy its paper, and keeps access to the market when conditions turn. The supports do not make a weak asset sound; they decide, in advance and in writing, who absorbs trouble when it comes.
The mechanisms divide into two families. Internal supports are built into the structure of the deal itself: overcollateralization, subordination, excess spread, reserve accounts. External supports are bought from an outside party: letters of credit, surety bonds, guarantees, and cash collateral held with a third bank.
These pages are working notes, kept in plain language. They explain how each support operates, what it protects against, and where its protection stops. They are general explanation for the interested reader; they are not an offer, a recommendation, or advice about any particular security or borrower.
Start with the primer, then read the two family documents in either order. Questions and corrections are welcome at the address on this letterhead.
The desk at Enhancement.Credit
From the notebook
The supports, numbered
- 1OvercollateralizationPledging more than is owed
- 2SubordinationJunior money absorbs loss first
- 3Excess spreadInterest margin held as cushion
- 4Reserve accountsCash set aside against shortfall
- 5Letters of creditA bank’s standby promise to pay
- 6Surety bonds and guaranteesAn outside party stands behind the debt
Working notes
Municipal bond insurance
A city that carries an insurer’s policy on its bonds offers holders two promises instead of one: its own, and the insurer’s undertaking to keep scheduled payments coming if the city cannot. The holder’s first look is still at the city; the policy matters on the day the city falls short.
Guaranteed mortgage pass-throughs
A pool of home loans can be passed through to certificate holders with a guarantee of timely payment standing over the pool. Individual borrowers still miss payments; the guarantee absorbs those misses so the certificate holder’s cash flow keeps its schedule.
Senior and subordinated classes
An asset-backed deal is commonly sold in ordered classes. The senior class is paid first and charged losses last; the junior classes accept the reverse in exchange for a higher coupon. The ordering itself is the enhancement, and it is written into the deal documents.
The shelf
What Credit Enhancement Is – the primer: the lender’s-eye view of risk and the two families of support. Document I
Internal Supports – overcollateralization, subordination, excess spread, and reserve accounts. Document II
External Supports – letters of credit, surety bonds, guarantees, and cash collateral. Document III
Enhancement.Credit
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