Mortgage REITs can underperform when interest rates change because the mortgage assets they own, the borrowing used to finance them, and their hedges do not respond at the same speed or in the same way. Rising rates can increase funding costs and reduce asset values; falling rates can speed up mortgage repayments and leave the REIT reinvesting at lower yields. Hedges can reduce some benchmark-rate exposure, but they do not eliminate mortgage-spread, prepayment, liquidity, or credit risks.
How interest-rate changes reach a mortgage REIT
A mortgage REIT earns income from mortgage-related assets and commonly uses borrowings to finance them. The gap between asset income and financing costs is its net interest spread. If borrowing costs rise before yields on existing fixed-rate assets adjust, that spread can narrow and pressure earnings. Dynex Capital describes this mismatch as a risk to earnings, mortgage-backed securities values, and book value during rising-rate periods in its 2024 Form 10-K.
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The effect is not identical across companies. Asset mix, funding terms, leverage, hedges, and management decisions all influence how quickly income and costs change. A rate increase is therefore not, by itself, enough to predict whether a particular mortgage REIT will underperform.
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Why mortgage assets can lose value or behave unexpectedly
Borrowers can prepay or refinance
Unlike a conventional bond with a fixed repayment schedule, a mortgage-backed security’s cash-flow timing depends partly on borrower behavior. Homeowners may repay early, often by refinancing when rates fall, or keep their loans longer when rates rise. That borrower option changes the expected life of the security just as market yields are changing.
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Falling rates can limit gains
When rates fall, borrowers may refinance or pay off mortgages faster. The investor receives principal back sooner and may have to reinvest it at lower prevailing yields. Faster prepayments can also accelerate the amortization of premiums paid for mortgage assets, affecting income and returns.
Rising rates can extend asset duration
When rates rise, refinancing becomes less attractive and prepayments may slow. The mortgage assets then remain outstanding longer than expected, potentially extending their duration while their market value is falling. This combination of price sensitivity and changing cash-flow timing is often described as negative convexity: the security’s rate sensitivity can worsen as rates move against it.
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Invesco Mortgage Capital’s 2025 Form 10-K discusses prepayment, extension, spread, and liquidity risks as distinct factors affecting results and book value.
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A mortgage REIT may use interest-rate derivatives or other positions to offset some changes in benchmark rates. But a hedge is not necessarily a matched offset to the value of mortgage securities: benchmark rates and mortgage-market spreads can move differently, and borrower prepayments can alter the assets’ duration after a hedge is established. Hedges may also be partial, adjusted over time, or designed to address earnings sensitivity rather than book value.
AGNC Investment Corp. states in its 2025 Form 10-K: “Our hedging strategies are generally not designed to protect our net book value from spread risk, which as a levered investor in mortgage-backed securities is the inherent risk we take that the spread between the market yield on our investments and the benchmark interest rates linked to our interest rate hedges fluctuates.” This is AGNC’s description of its strategy, not a universal statement about all mortgage REITs.
AGNC also discloses that it may choose not to fully hedge rate, prepayment, or extension risk, and that hedges intended for larger market moves may be less effective for smaller changes. A hedge can reduce one exposure while leaving others intact.
Spread changes and leverage can amplify losses
Mortgage-security prices respond not only to benchmark yields but also to mortgage spreads—the additional yield investors demand for holding mortgage assets rather than comparable benchmark securities—and to market liquidity. If mortgage spreads widen, mortgage assets can fall in value even when a benchmark-rate hedge offsets part of a rate move. This mismatch is often called spread or basis risk.
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Leverage magnifies the effect of asset-price moves on a REIT’s equity and book value. Mortgage REITs commonly use secured financing, so a fall in collateral values or a tightening in financing availability can increase liquidity pressure. Depending on contract terms and market conditions, a company may need to provide additional collateral or sell assets. Invesco describes asset sales as a possible response under extreme liquidity conditions; that does not mean every rate move triggers a margin call or forced sale.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Mortgage REITs do not all have the same rate and credit risks
Agency mortgage-backed securities and credit-oriented mortgage investments carry different mixes of risk. Agency securities are primarily exposed to interest rates, prepayments, spreads, and financing conditions; non-agency securities and loans may also expose investors to borrower defaults and property-credit performance. PennyMac Mortgage Investment Trust distinguishes rate sensitivity in agency and senior non-agency mortgage-backed securities from credit sensitivity in subordinate and credit-linked investments in its 2025 Form 10-K.
Consequently, an underperforming mortgage REIT may be facing credit deterioration, spread widening, financing pressure, or a combination of these—not just a change in interest rates. Attribution requires looking at the actual portfolio and the company’s risk disclosures.
How to compare two mortgage REITs’ rate exposure
- Asset mix: Identify agency MBS, non-agency securities, whole loans, commercial loans, and credit-linked investments; these holdings do not share one risk profile.
- Funding structure: Check borrowing types, maturities, repricing terms, and reliance on secured financing. Funding costs need not move in lockstep across companies.
- Leverage and liquidity: Review how much borrowing supports the portfolio and what collateral or liquidity pressures the company describes under stress.
- Hedge design: Look at which exposures are hedged, how hedge duration compares with asset duration, and which spread, basis, prepayment, or extension risks remain.
- Scenario assumptions: Treat rate-sensitivity tables as model estimates, not forecasts. Invesco’s filing describes a static-portfolio analysis using assumed parallel yield-curve shifts and constant asset and financing spreads; actual portfolios and market conditions can change.
There is no single broadly comparable sector statistic that establishes how much all mortgage REITs will gain or lose for a given rate move. Company sensitivity tables apply to a specific issuer, portfolio date, scenario, and set of assumptions; they should not be generalized to the sector.
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