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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsMortgage bonds can amplify a rise in long-term Treasury yields, but they do not mechanically cause one. When rates rise, fewer homeowners refinance, so mortgage-backed securities (MBS) return principal more slowly and can become more sensitive to further rate changes. Investors who hedge that added exposure may sell or reposition Treasuries or adjust derivatives, adding pressure to yields. That feedback is conditional: the initial move can come from policy, inflation or other forces, and the scale of any mortgage-hedging effect varies.
Why mortgage bonds behave differently from Treasuries
A Treasury bond generally pays interest on a schedule and returns principal at maturity. A mortgage-backed security passes through payments from a pool of home loans. Homeowners pay down principal over time, but they can also repay early by selling a home or refinancing.
That early-payment option belongs to the borrower, not the MBS investor. When mortgage rates fall, refinancing can accelerate and principal may come back sooner, leaving investors to reinvest at lower yields. When rates rise, fewer borrowers have an incentive to replace older, lower-rate mortgages with new loans. Principal then tends to arrive more slowly, leaving investors exposed to the securities’ cash flows for longer. The uncertainty created by early repayment is called prepayment risk; the risk that repayment slows and a security’s expected life extends is extension risk. The New York Fed’s overview of mortgage-backed securities explains these features.
How the feedback loop can push yields higher
- Rates rise first. A change in expected monetary policy, inflation or other market conditions can lift Treasury yields and mortgage rates.
- Refinancing slows. Homeowners with mortgages below prevailing rates are less likely to refinance, so MBS principal payments slow.
- MBS duration extends. The expected cash flows stretch out, making the MBS portfolio more exposed to interest-rate changes than before.
- Investors adjust hedges. A holder seeking to keep interest-rate exposure near a target may sell or reposition other rate-sensitive assets, including Treasuries, or alter derivatives positions.
- Those flows can reinforce the move. If many investors make similar adjustments in a concentrated period, added selling pressure can raise longer-term yields. Higher rates can then further discourage refinancing and extend MBS cash flows again.
This is often discussed as convexity hedging: mortgage cash flows do not respond to rate changes in the same way as a bond with fixed payments, so investors may need to change their hedges as rates move. The effect depends on the size and timing of those adjustments; it is not an automatic, one-way trading rule for households.
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What the historical evidence does—and does not—show
A 1994 Federal Reserve Bank of New York study examined the rise in mortgage-security duration after monetary tightening earlier that year. The authors found that hedge and portfolio realignments appeared to affect short-run Treasury-market movements, particularly in 10-year securities. Their conclusion was qualified: Treasury hedging of MBS extension risk “may have magnified” the increase in long-term rates. It does not establish that mortgage hedging caused the entire move or that the same effect occurs at the same scale in every selloff. See “Mortgage Security Hedging and the Yield Curve”.
A separate Federal Reserve paper by Roberto Perli and Brian Sack found that implied volatility of the 10-year swap rate rose when prepayment risk in outstanding mortgages increased. The authors interpreted that as consistent with market expectations that hedging would amplify future rate movements. They said the amplification could be considerable but was generally expected to last only several months. That is evidence about expected market behavior, not a real-time estimate of how much MBS hedging contributes to Treasury yields in a particular episode. The paper is “Does Mortgage Hedging Amplify Movements in Long-term Interest Rates?”.
Why mortgage rates and Treasury yields can diverge
A mortgage rate is not simply a Treasury yield with a fixed amount added. Mortgage loans and MBS have different cash flows and risks from Treasuries. Mortgage pricing reflects the value of the borrower’s prepayment option, interest-rate volatility, refinancing costs and other market factors, in addition to the broader level of rates. A Treasury yield can rise without MBS hedging being the main driver; mortgage rates can also rise more or less than Treasury yields as mortgage-market spreads change.
The Dallas Fed’s review of 2022 describes this distinction in a specific episode: it identifies rising risk-free Treasury yields as the primary driver of mortgage-rate increases that year, with the cost of the prepayment option amplifying the rise. Its account puts the 10-year Treasury rate at about 1.6% at the start of 2022, around 4.2% at its late-October peak and almost 3.8% at year-end. Those are Treasury-rate observations for that period, not an estimate of the portion attributable to MBS hedging. Read the Dallas Fed analysis.
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What recent mortgage-spread figures mean
In a 2026 analysis, Boston Fed economist Paul S. Willen reports that expectations about future rates, interest-rate volatility and refinancing costs explain approximately 80% of variation in the analysis’s mortgage coupon-spread measure since 2006. That finding concerns this defined mortgage spread; it does not mean those factors, or MBS hedging alone, explain 80% of Treasury-yield changes.
| Period | Boston Fed coupon-spread measure |
|---|---|
| October 2021 | 46 basis points |
| October 2022 | 190 basis points |
| End of 2025 | 85 basis points |
These are the Boston Fed measure and observation dates reported in the 2026 analysis, not a general mortgage-versus-Treasury spread series or a current mortgage quote. The analysis also notes that the Treasury curve and factors such as volatility and refinancing costs changed over the period; the spread movements reflect the combined factors it models. See “Why Mortgage Rates Exceed Treasury Yields”.
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The mechanism is more relevant when refinancing incentives are changing, mortgage duration is shifting materially and many investors need to alter similar hedges at once. The impact also depends on market conditions and the instruments investors use. A change in MBS spreads is related context, but it is not itself proof of a Treasury-hedging feedback loop.
- Refinancing incentive: If rates rise well above the coupons on existing mortgages, refinancing may slow and extension risk can grow.
- Rate volatility: Greater uncertainty about rates can increase the value of the prepayment option and affect MBS pricing. The Dallas Fed’s 2022 review discusses this link.
- Refinancing costs and other spread drivers: Borrower costs and fixed-income-market conditions can move mortgage spreads independently of the size of Treasury hedge flows. The New York Fed’s “Understanding Mortgage Spreads” examines these factors.
- Concentration and timing: Hedge changes are more likely to affect market prices when flows are large relative to available liquidity and occur together. The historical studies support a possible amplification channel, not a universal effect.
For readers tracking markets, the practical distinction is between the original rate shock, the change in expected mortgage cash flows, any resulting hedge adjustment and the separate movement in mortgage spreads. These can interact, but a headline move in Treasury yields alone does not identify which channel mattered most.
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