How to Read a Mortgage Rate Benchmark
Published rate averages are not quotes. Knowing what each index measures stops you comparing numbers that are not comparable.
The headline mortgage rate you see quoted is an average produced by a specific methodology. Different indices measure different things, and they disagree.
Transaction-based indices
Some indices are built from actual locked loans on a lending platform. They reflect what borrowers genuinely agreed, update daily, and move with real activity — but they reflect the mix of borrowers using that platform.
Survey-based indices
Others are weekly surveys of a set of lenders in a set of markets. They are consistent over long histories, which makes them good for trend, but they are not transaction data and they lag.
Why the numbers differ
- Different credit profiles in the sample
- Different loan-to-value mixes
- Different points and fee assumptions baked into the quoted rate
- Different measurement dates
None of them is your rate
Your rate depends on credit score, loan-to-value, occupancy, property type, loan size and the lender's own pricing that day. An index is a benchmark for direction, not a quote for you.
How to use them properly
Track one index consistently for trend, and get real quotes for pricing. Comparing this week's survey average against last month's transaction index tells you nothing useful.
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General information for the Carolinas market, not legal, tax or investment advice. Rules differ by state and by situation — take professional advice before acting.