Why Does the Mortgage Spread Matter?

The mortgage spread is the difference between the 30-year fixed mortgage rate and the 10-year Treasury yield. Because mortgages are typically held or refinanced within a 10-year window, the 10-year Treasury serves as the baseline “risk-free” rate that investors use to price mortgage-backed securities (MBS).

Historically, this spread averages around 170 basis points (1.70%). When the spread widens beyond this average, it often signals market volatility, inflation fears, or economic uncertainty causing lenders to demand a higher risk premium. Conversely, a narrow spread can indicate a highly favorable environment for home buyers to lock in a mortgage.