Understanding Mortgage Rates: Beyond the Fed Rate
With all the recent discussion around housing affordability and the Federal Funds Rate (Fed Rate), it’s important to clarify a common misconception: Fed Rates are not the primary drivers of mortgage rates.
What Really Drives Mortgage Rates?
Mortgage rates are influenced mainly by the Treasury Constant Maturity (TCM) - referred to as long-term yield rates - based on 10-year or 30-year U.S. Treasury bonds. These yields serve as a benchmark for mortgage rates because they reflect market expectations for future growth and inflation, making them a more accurate indicator than the Fed Rate.
Fed Rate vs. Long-Term Yield
- Fed Rate: Impacts short-term lending between banks and has minimal direct effect on long-term mortgage rates.
- TCM (Long-Term Yield): Represents returns on long-term government bonds and is closely tied to mortgage rate movements.
Market Dynamics
Mortgage rate changes often occur weeks before a Fed Rate adjustment because markets anticipate economic conditions in advance. Factors such as market demand, inflation expectations, and overall economic outlook are already priced in. The chart below highlights the correlation between Fed Rates, 10-year TCM, and 30-year Fixed Rate Mortgage (FRM).
Reference: https://www.hsh.com/indices/does-the-federal-funds-rate-affect-mortgage-rates.html
For example, in September 2024, the Fed Rate decreased, yet both the 10-year TCM and 30-year Fixed Rate Mortgage (FRM) increased during that period. Prior to the Fed Rate cut, TCM and FRM had already declined in anticipation of improved market conditions, showing that long-term yields are a leading indicator.
Key Takeaway
When discussing mortgage rates, remember that long-term yield rates - not Fed Rates - are the true drivers of mortgage loans. Many commentators overlook this distinction when talking about affordability. As a buyer, seller, or renter, it’s crucial to work with real estate professionals who understand these dynamics and can provide accurate, data-driven guidance.
Why Choose Realsophy Real Estate?
At Realsophy Real Estate, led by Sophia Georges, Broker/Owner/M.B.A., our team stays deeply informed about housing market trends and economic analysis. We combine personal, professional, and educational expertise to help you make the best decisions for buying, selling, investing, or renting.
If you’re planning your next move - whether purchasing a home, starting a business, or building wealth through real estate - Realsophy Real Estate is your trusted source for insight and strategy.
November 17, 2025
by Sophia Georges
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