Updated for the 2026-2027 CFA® Level I curriculum.
A residential mortgage is a loan secured by a home. Features important to securitization include fixed or adjustable rates, amortization, maturity, balloon payments, loan-to-value ratio, borrower credit, recourse, collateral quality, and the right or cost to prepay.
Quick Answer
A residential mortgage is a loan secured by a home. Features important to securitization include fixed or adjustable rates, amortization, maturity, balloon payments, loan-to-value ratio, borrower credit, recourse, collateral quality, and the right or cost to prepay.
Key Takeaways
The property secures the lender's claim.
Fixed-rate and adjustable-rate loans shift rate risk differently.
Amortization is the repayment schedule; maturity is the final due date.
Higher LTV means less borrower equity and collateral cushion.
Recourse determines whether the lender may pursue assets beyond the property.
Prepayment changes the timing of principal cash flows.
What You Need to Know for CFA Level I
Identify the underlying asset or structure.
Trace interest and principal cash flows.
State who receives payments and who absorbs losses.
Connect the structure to its main risks.
What Is a Residential Mortgage Loan?
A residential mortgage loan finances the purchase or refinancing of a home and is secured by a legal claim on the property. The borrower makes scheduled payments of interest and, in most structures, principal according to the terms of the loan.
The property serves as collateral. If the borrower defaults, the lender may enforce its rights against the property, subject to the mortgage contract and applicable law. Collateral improves recovery prospects but does not guarantee that the lender will recover the full outstanding balance.
For securitization, investors care about both the borrower's ability to repay and the loan features that determine when and how cash flows are received.
Fixed-Rate vs Adjustable-Rate Mortgages
The interest-rate structure determines whether the borrower's mortgage rate remains constant or changes over time.
Mortgage Type | Rate Structure | Borrower Effect | Cash Flow Effect |
|---|---|---|---|
Fixed-rate mortgage | Contractual interest rate remains unchanged | Payments are more predictable when the loan is fully amortizing | Interest cash flows are based on the same mortgage rate throughout the fixed-rate period |
Adjustable-rate mortgage | Interest rate resets according to stated terms | Payments may rise or fall when the mortgage rate resets | Future interest cash flows depend partly on the reset rate |
With a fixed-rate mortgage, the borrower is protected from increases in market interest rates on the existing loan. With an adjustable-rate mortgage, more of the effect of changing rates is passed through to the borrower through future payment resets.
The rate structure also affects refinancing incentives. When market mortgage rates fall below the rate on an existing fixed-rate loan, borrowers may have a stronger incentive to refinance and repay the original mortgage early.
Amortization, Maturity, and Balloon Features
Amortization describes how scheduled mortgage payments reduce the outstanding principal balance over time. Maturity is the date when the remaining loan balance must be repaid.
A fully amortizing mortgage is structured so that scheduled payments reduce the balance to zero by maturity. Each payment generally contains both interest and principal, with the outstanding balance declining over time.
A mortgage can also have an amortization period that is longer than its contractual maturity. In that case, scheduled payments do not reduce the balance to zero before maturity, leaving a balloon payment due at the end of the loan.
For exam questions, keep the distinction clear:
Amortization tells you how principal is scheduled to decline.
Maturity tells you when the loan becomes finally due.
Balloon payment is the remaining principal that must be paid at maturity when the loan has not fully amortized.
Loan-to-Value, Recourse, and Borrower Credit
Several features help assess how much protection the lender has if the borrower cannot make the required payments.
The loan-to-value ratio compares the outstanding mortgage balance with the value of the property securing the loan:
where:
LTV = loan-to-value ratio
Mortgage Balance = outstanding mortgage principal
Property Value = value of the mortgaged property
A higher LTV means the borrower has less equity relative to the property value and the lender has a smaller collateral cushion. A lower LTV provides more borrower equity to absorb a decline in property value before the mortgage balance exceeds the value of the collateral.
Borrower credit characteristics also matter because they affect the likelihood that scheduled payments will be made. Relevant factors can include income, payment history, and the borrower's overall ability to service the mortgage.
Recourse determines whether the lender may have a claim against the borrower beyond the mortgaged property. With recourse, the lender may be able to pursue other borrower assets after foreclosure if the collateral does not fully cover the obligation, subject to applicable law and contract terms.
Prepayment Features
Prepayment occurs when the borrower repays some or all of the mortgage principal earlier than scheduled. This can happen through refinancing, a property sale, or additional principal payments.
Mortgage contracts may differ in how freely borrowers can prepay. Some permit early repayment without a significant charge, while others may impose restrictions or prepayment penalties.
Prepayment matters to investors because it changes the timing of principal cash flows. Faster prepayment returns principal sooner than expected, while slower prepayment keeps principal outstanding longer. When residential mortgages are pooled into mortgage-backed securities, this uncertainty becomes a key source of prepayment risk.
Illustrative Example
A borrower takes a USD 320,000 mortgage on a USD 400,000 property. . The loan has fixed monthly payments, scheduled amortization, and a prepayment option. The 20% borrower equity provides a collateral cushion, but it does not remove credit or property-value risk.
Common Exam Traps
Confusing loan maturity with amortization
A long contractual maturity does not mean equal principal is repaid each period. Check whether payments amortize the balance, pay only interest for a period, or leave a balloon.
Reversing loan-to-value
LTV equals the loan balance divided by the property value, not the property's equity divided by its value. A USD 320,000 loan on a USD 400,000 home has an 80% LTV.
Assuming collateral removes default risk
The property supports recovery, but a decline in value, foreclosure costs, and time to sell can leave the lender with a loss.
Treating prepayment as scheduled amortization
A required monthly principal payment follows the contract; refinancing or an extra principal payment is unscheduled and changes the expected loan life.
Confusing the borrower's loan with an RMBS tranche
Loan terms describe obligations of one homeowner, while securitization pools many loans and distributes their cash flows to security holders.
Practice Question
A borrower has a USD 320,000 mortgage on a property worth USD 400,000. The loan-to-value ratio is:
20%
80%
125%
Correct Answer: Option B
Explanation: The loan-to-value ratio is .
Option A: The 20% figure represents the borrower’s equity as a percentage of property value, not the loan-to-value ratio.
Option C: The 125% figure reverses the required mortgage-balance-to-property-value calculation.
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FAQs About Residential Mortgage Loans
What mortgage features matter for securitization?
Rate type, amortization, maturity, LTV, borrower credit, recourse, collateral, and prepayment terms.
How is loan-to-value calculated?
Divide the current mortgage balance by the property value.
What is the difference between maturity and amortization?
Maturity is the final due date; amortization is the schedule for reducing principal.