With the Federal Reserve's first interest rate cut of the year on Sept. 17 — and the expectation of two more by the end of the year — where are mortgage rates heading long-term? Mortgage interest rates are determined by many factors, not just the fed funds rate. A primary factor is the 10-year Treasury yield. At Yahoo Finance, we’ve designed a five-year mortgage rate forecast, built on a 10-year yield correlation, that provides some insight. Read more: The best mortgage lenders right now Mortgage rates ...