What it is
Mortgage rates are the interest lenders charge to lend you money to buy or refinance a home. Many people assume the Federal Reserve “sets” mortgage rates directly. It doesn’t. Long-term mortgage rates are shaped mainly by the bond market — specifically the 10-year Treasury yield and the pricing of mortgage-backed securities (MBS).
How it works
Most home loans don’t stay on a single lender’s books. They are packaged into mortgage-backed securities and sold to investors. What those investors are willing to pay for MBS determines what rate lenders can offer you.
- The 10-year Treasury as a benchmark. Fixed mortgages typically last far less than 30 years in practice (people sell or refinance), so their pricing tracks the 10-year Treasury yield (the return investors earn on the bond) rather than a 30-year bond. When Treasury yields rise, mortgage rates generally rise; when they fall, mortgage rates generally ease.
- MBS pricing adds a spread. Mortgage rates sit somewhat above the 10-year Treasury yield. The gap (the “spread”) reflects the extra risk investors take on with mortgages — mainly the risk that borrowers prepay. This spread widens or narrows with market conditions.
- Daily movement. Because bonds trade continuously, mortgage rates can move day to day, and occasionally even within a single day.
The Fed’s role (indirect)
The Federal Reserve sets the federal funds rate — a very short-term rate banks charge each other overnight. This influences short-term borrowing costs and, importantly, market expectations about inflation and growth.
- Mortgage rates respond to the Fed’s signals and the resulting bond-market reaction, not to the funds rate mechanically.
- Sometimes the Fed raises the funds rate and mortgage rates fall (or vice versa), because the bond market had already priced in the move or is reacting to the broader outlook.
- Freddie Mac’s Primary Mortgage Market Survey (PMMS) is a widely cited weekly gauge of average rates if you want a neutral reference point.
How to think about it
- Watch the 10-year Treasury yield as a leading indicator; mortgage rates tend to follow it.
- Treat headlines about “the Fed cutting rates” cautiously — the effect on mortgage rates is indirect and often already reflected in the market.
- Day-to-day rate noise matters less than the broader trend over weeks and months.
Bottom line
Mortgage rates follow the bond market — the 10-year Treasury yield plus an MBS spread — rather than being set directly by the Federal Reserve. Understanding this helps you read rate news more accurately: the question isn’t just “what did the Fed do,” but “how is the bond market pricing inflation, growth, and mortgage risk.”