Chapter 28 — Key Takeaways

The core claims

1. The money at the closing table was borrowed and had to be sold. Your employer funded \$365,750.00 on a warehouse line and repaid it by selling the loan within weeks. That single fact is why guidelines are treated as absolute and why an unsalable loan is a catastrophe rather than an inconvenience.

2. Fannie Mae and Freddie Mac buy loans. Ginnie Mae does not. The GSEs purchase, pool, securitize, guarantee, and publish the rulebook. Ginnie Mae buys nothing and issues nothing — it guarantees securities issued by approved private issuers and backed by government-insured or guaranteed loans.

3. Only Ginnie Mae carries the full faith and credit of the United States. Fannie and Freddie are shareholder-owned corporations under federal charter, in conservatorship under FHFA since September 2008, supported by Treasury agreements — which is not the same legal thing.

4. The borrower's note rate is not one number; it is a stack. Note rate minus servicing fee minus guarantee fee equals the pass-through rate paid to investors. The borrower never sees the pieces.

5. The TBA market lets a lender sell a security before the loans in it exist. A trade specifies agency, maturity, coupon, price, par amount, and settlement date — not which pools. That is the mechanism behind every forward rate lock you will ever take.

6. Servicing is a separate asset that moves opposite to bonds. A mortgage servicing right is worth more when rates rise (nobody prepays) and less when rates fall (everybody does). That is why originating and servicing are two businesses that fail in opposite weather.

7. Execution is a choice, and it is made in dollars. A whole loan sale is cash today; a securitized execution is less cash plus a booked servicing asset. Neither is right in the abstract, and the choice explains a surprising amount of your rate sheet.

8. Non-agency means the rulebook changes, not just the loan amount. Above the conforming limit or outside the agency box, whoever buys the loan writes the rules — and there are many of them, and they are not published in advance.

9. The rulebook is a price list. Every guideline in Part III, every disclosure in Part IV, and every adjustment in Chapter 29 exists because somebody several steps removed is deciding the terms on which their money will show up. Chapter 14's representations and warranties are the contractual form of it, enforced by a repurchase demand.

The key arithmetic

The coupon stack — the one formula to carry out of this chapter:

   note rate  −  servicing fee  −  guarantee fee  =  PASS-THROUGH RATE

   6.625%     −     0.250%      −     0.375%      =      6.000%
              [constructed teaching example; fees change — verify at the source]

Applied to the first payment on \$365,750.00, where interest is \$2,019.24:

Principal — \$322.70 in month one — is never carved. It passes through in full.

MSR conversion, both directions:

   basis points of balance  =  annual servicing fee %  ×  multiple
   0.250% × 4.5  =  1.125%  =  112.5 bps  =  $4,114.69 on $365,750

The counterintuitive rule of thumb:

Rates down → prepayments up → expected life short → MSR worth less Rates up → prepayments down → expected life long → MSR worth more And the moves are not symmetric: the downside is larger, because prepayment speeds can accelerate almost without limit while lock-in saturates.

The comparison to memorize

Key terms

Fannie Mae · Freddie Mac · Ginnie Mae · mortgage-backed security (MBS) · pool · pass-through rate · coupon · To-Be-Announced (TBA) market · guarantee fee (g-fee) · agency / non-agency · whole loan sale · servicing released / servicing retained · mortgage servicing right (MSR) · capital markets desk · document custodian

What you should be able to do Monday morning

Answer the question every borrower eventually asks — "who's going to own my loan?" — accurately, in sixty seconds, without frightening anybody. Then use the same chain to explain why the underwriter needs the letter of explanation, why the disclosure timing matters, and why their 706 score at 95% loan-to-value prices where it does. If a condition still feels arbitrary after you have walked the chain, you have found either an overlay worth escalating or a gap in your own understanding — and you now know how to tell which.