Question 1

What is key rate duration in mortgage finance?

Accepted Answer

Key rate duration measures how the value of a mortgage or mortgage-backed security (MBS) changes when a single point on the yield curve shifts by one basis point (0.01%), while all other points remain unchanged. Unlike standard duration (which assumes a parallel shift across the entire yield curve), key rate duration isolates the sensitivity to specific maturities: the 2-year rate, 5-year rate, 10-year rate, and 30-year rate. This is important for mortgage valuation because: mortgage prepayment rates are influenced by different parts of the yield curve, and a steepening or flattening yield curve affects mortgage values differently than a parallel shift.

Question 2

Why is key rate duration important for Florida real estate finance?

Accepted Answer

For Florida real estate professionals and investors: key rate duration helps explain why mortgage rates don’t always move in lockstep with the Federal Reserve’s short-term rate changes. Mortgage rates are most sensitive to the 10-year Treasury rate (because most mortgages are prepaid within 7-10 years). When the yield curve steepens (short rates fall, long rates rise), mortgage rates may increase even if the Fed cuts rates. When the curve flattens or inverts, mortgage rates may fall relative to short-term rates. Understanding key rate duration helps: borrowers time their mortgage rate locks, investors evaluate MBS portfolio risk, and lenders price their mortgage products accurately.

Question 3

How does prepayment risk affect key rate duration for Florida mortgages?

Accepted Answer

Prepayment risk is the dominant factor: when interest rates fall, borrowers refinance (prepay) their mortgages, shortening the effective duration. When rates rise, prepayments slow and duration extends. This is called "negative convexity." Key rate duration captures this by showing: at low rates, the mortgage’s key rate duration is concentrated at shorter maturities (because prepayments are expected sooner), and at high rates, the key rate duration shifts to longer maturities (because prepayments are expected to slow). For Florida specifically: the state’s active refinancing market (driven by rising property values and population growth) means prepayment risk is particularly relevant, and key rate duration analysis helps investors and lenders manage this risk.

Key Rate Duration

Key Rate Duration in Mortgage Finance

How It Works

Florida Real Estate Impact

Prepayment Risk

Related Terms

Barnes Walker Real Estate Finance

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