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Why Mortgage REITs Can Underperform When Interest Rates Change

Mortgage REITs face mismatches among asset yields, borrowing costs and hedges. Learn why rate moves can affect earnings, book value and liquidity in different ways.

By TheFinanceBase Team 4 min read
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Mortgage REITs can underperform when interest rates change because their mortgage investments, borrowing costs and hedges do not adjust in sync. Rising rates can squeeze income and reduce asset values; falling rates can speed up mortgage repayments and leave the REIT reinvesting at lower yields. Hedges may offset some benchmark-rate moves, but they do not eliminate mortgage-spread, prepayment, liquidity or credit risks.

How a mortgage REIT is exposed to rate changes

A mortgage REIT (mREIT) invests in mortgages or mortgage-backed securities (MBS) and often finances those assets with borrowings. Its results therefore depend on both sides of the balance sheet: what its assets earn and what it pays to finance them.

If borrowing costs rise faster than income from existing fixed-rate assets, the net interest spread—the difference between asset income and funding costs—can narrow. That can pressure earnings. At the same time, higher market yields can reduce the value of existing mortgage securities and lower book value, or the estimated value of assets minus liabilities. The timing and size of these effects vary with the REIT’s assets, financing, hedges and management decisions. Dynex Capital’s 2024 Form 10-K describes the potential for rate mismatches, lower MBS values and lower book value during rising-rate periods.

Why rising and falling rates create different mortgage risks

Mortgage borrowers can usually repay or refinance early. That option changes when a mortgage-backed security returns principal, so its cash flows—and effective duration, or sensitivity to rate changes—are less predictable than those of a bond with fixed payment dates.

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When rates rise

Refinancing becomes less attractive, so borrowers tend to prepay more slowly. The securities can then remain outstanding longer than expected, just as their market values may be falling. This extension risk can leave an mREIT holding lower-value assets for longer and create a mismatch with shorter-term financing or hedges.

When rates fall

More borrowers may refinance, returning principal sooner. If an mREIT bought securities at a premium, faster repayment can accelerate the loss of that premium; the REIT may also need to reinvest returned principal at lower yields. As a result, falling rates do not guarantee better performance.

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This asymmetry is often called negative convexity: mortgage prices may gain less when rates fall than comparable fixed-cash-flow bonds would, while the expected life of the mortgages can lengthen when rates rise. The borrower’s prepayment option is the reason for the effect.

Why hedges can leave important risks uncovered

Mortgage REITs may use financial hedges to offset selected interest-rate exposures, but hedge results depend on what is hedged, how much protection is in place, and how the hedge is adjusted. Some strategies target book value, others may be intended to reduce earnings volatility, and a hedge can be partial or less effective for smaller rate moves. It is not a guarantee against losses.

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Hedges tied to benchmark rates may not track mortgage-security prices closely. Mortgage spreads—the additional yield investors demand over benchmark rates—can widen, or liquidity can deteriorate, even when a hedge offsets part of a benchmark-rate move. That mismatch is spread or basis risk.

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 describes AGNC’s strategy, not necessarily every mREIT’s hedge design.

How leverage and liquidity can amplify a market move

Because mREITs often use secured borrowing, a decline in collateral values or tighter financing availability may create pressure to provide more collateral or reduce borrowing, depending on contracts and market conditions. If liquidity is insufficient, a company may have to sell assets. Selling into a weak market can turn paper losses into realized losses and further reduce the assets available to support financing.

This is a possible stress pathway, not an automatic result of every rate change. Invesco Mortgage Capital’s 2025 Form 10-K discusses liquidity risk and possible asset sales under extreme conditions.

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Why one mortgage REIT may react differently from another

“Mortgage REIT” covers portfolios with different assets and risks. Agency-backed MBS, non-agency securities, whole loans and commercial mortgages do not have identical rate, prepayment or credit exposures. A rate-driven decline in asset value should not be confused with credit losses from borrowers or properties that fail to meet obligations.

PennyMac Mortgage Investment Trust distinguishes rate sensitivity in agency and senior non-agency MBS from credit sensitivity in subordinate and credit-linked investments in its 2025 Form 10-K. That distinction illustrates why portfolio composition matters when explaining an individual REIT’s performance.

What to compare when assessing rate sensitivity

For a useful comparison, review each company’s latest filings rather than assuming that sector-wide rate moves affect all mREITs alike.

  • Assets: Identify the mix of agency MBS, non-agency securities, whole or commercial loans, and credit-linked holdings.
  • Funding: Check borrowing types, maturities, repricing terms and reliance on secured financing.
  • Leverage and liquidity: Consider how much borrowing supports the portfolio and what collateral or liquidity pressures could arise in a market shock.
  • Hedges: Look at which exposures are hedged, hedge duration, and residual spread, basis, prepayment and extension risks.
  • Scenario assumptions: Treat sensitivity tables as estimates based on a specified portfolio date and model assumptions, not forecasts. Invesco describes a static-portfolio analysis using assumed parallel yield-curve shifts and constant asset and financing spreads in its 2025 Form 10-K.

These disclosures can help explain potential exposures, but they do not establish a current ranking or predict future returns. Company-specific sensitivity results should be read with their measurement date and assumptions attached.

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Why there is no single rate-change outcome for the sector

Rising rates can weigh on funding spreads, mortgage values and expected asset life; falling rates can accelerate repayments and lower reinvestment yields. But a REIT’s actual outcome depends on its portfolio, financing, leverage and hedge choices. Neither direction guarantees underperformance—or outperformance—for every mortgage REIT.

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