Mortgage rates recently dipped close to 6%, a meaningful psychological and economic threshold for both borrowers and lenders. That move has been closely tied to the GSEs’ announcement of roughly $200 billion in mortgage-backed securities purchases, which helped tighten MBS spreads and pull conventional mortgage rates lower. While that development has sparked comparisons to the Federal Reserve’s MBS buying during the pandemic, today’s environment and its implications for credit unions, looks very different.
The key distinction is that the GSEs are not acting as a policy tool in the way the Fed did in 2020 and 2021. When the Fed was purchasing MBS, it was intentionally suppressing mortgage rates as part of a broad economic stimulus effort. Those MBS purchases were price-insensitive and open-ended along with buying treasuries at the same time, which pushed mortgage rates well below levels justified by fundamentals. Today’s GSE activity, by contrast, is finite, yield-sensitive and driven by balance-sheet mechanics rather than a mandate to stimulate housing demand. Also, to note, the GSEs will likely have to hedge their MBS holdings so they will be selling rates at the same time that they are buying MBSs.
That difference matters. It explains why mortgage rates can move lower without signaling a return to ultra-low rates. GSE buying has improved market technicals and tightened spreads, but it has not eliminated interest-rate risk, volatility or prepayment concerns for investors. As a result, mortgage rates remain more responsive to Treasury yields and broader market conditions than they were during the QE era.
Lower rates are helping refinancers more than homebuyers
While rates below 6% grab headlines, the immediate impact is showing up more in refinancing activity than in home purchase demand. Roughly one-quarter of outstanding conventional mortgages are now considered “in the money” for refinancing, with the share even higher for more recent vintages. For borrowers who took out loans over the past three years, this rate move represents a real opportunity to reduce monthly payments, validating the idea that many borrowers were willing to “date the rate” while waiting for better conditions.
However, lower rates have not meaningfully solved the affordability challenge for homebuyers. Even modest home price appreciation can quickly offset the benefit of a 25-basis-point decline in mortgage rates. With housing supply still constrained, especially in existing homes, renewed demand risks pushing prices higher rather than unlocking significantly more transactions. In that sense, today’s rate rally improves household cash flow more than it expands housing accessibility.
Housing supply remains the binding constraint
Mortgage-rate lock-in continues to limit resale inventory, even as rates fall. Many homeowners who locked in historically low rates earlier in the decade would still face a substantial increase in monthly payments if they moved today. While accumulated home equity can soften that impact for some households, it has not been enough to meaningfully increase turnover.
New construction offers an alternative, but it remains insufficient to meet demand on a national scale. Builder confidence is still weak, housing starts have slowed and new-home supply is concentrated geographically. Importantly, builders have relied heavily on incentives such as rate buydowns, which means a decline in mortgage rates does not automatically translate into a surge in new supply. Without a meaningful increase in inventory, lower rates risk reinforcing price pressures rather than resolving affordability constraints.
What this means for MBS spreads and mortgage rates going forward
The GSE purchase program has clearly tightened MBS spreads, helping conventional mortgage rates break through an important threshold. That support is real, but it is also limited. Unlike during QE, spreads are still being set by return-oriented investors who require compensation for volatility, convexity and extension risk. As a result, spreads can tighten further, but they are unlikely to revisit the extreme levels seen during the pandemic.
For mortgage rates, this suggests a more balanced outlook. GSE demand can cushion volatility and improve execution, but it does not cap rates in the way Fed buying once did. Mortgage rates are likely to remain range-bound, sensitive to Treasury movements and prone to periods of volatility, particularly as refinancing activity picks up and prepayment expectations adjust.
What credit unions should take away
For credit unions, this environment rewards realism and discipline. The recent decline in rates creates opportunities, particularly in refinancing and selective MBS investments, but it does not mark a return to a policy-driven housing boom. Mortgage pricing, hedging and pipeline management matter more in a market where rates are no longer artificially suppressed.
Agency MBS remain high-quality, capital-efficient assets, but performance will depend on entry points and structure selection rather than broad market tailwinds. On the lending side, lower rates may help members improve cash flow without materially increasing housing supply, reinforcing the importance of thoughtful balance-sheet positioning.
The bottom line is that the GSEs’ MBS purchases are supportive, not stimulative. This is a market being nudged by fundamentals, not overridden by policy. For credit unions, understanding that distinction is critical to navigating mortgage strategy in 2026.
Important Disclosures:
"Catalyst" is a brand name for the financial services business conducted by Catalyst Corporate Federal Credit Union ("Catalyst"), both directly and through its subsidiaries, including CUSOURCE, LLC, d/b/a Catalyst Strategic Solutions ("CSS"). Balance sheet management services and asset liability management services are offered through CSS, a SEC registered investment adviser. CSS is a separate entity from Catalyst and all investment decisions are made independently by CSS employees. Neither Catalyst nor CSS provide its clients with legal, tax or accounting advice.