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DEFINITION of 'ARM Index'. The benchmark interest rate to which an adjustable rate mortgage is tied. An adjustable rate mortgage's interest rate consists of an index value plus a margin. The index underlying the adjustable rate mortgage is variable, while the margin is constant. There are several popular indexes used for different types of adjustable rate mortgages. This is also referred to as the fully indexed interest rate.
1 Historical performance of 16 mortgage ARM indexes: Detailed Comparison Chart. 2  ARM Index Variability Table for the most recent 12 months. 3  The number of times mortgage (ARM) indexes' movement changed direction during each calendar year. 4  National Monthly Average Mortgage Rates (FHLMC, HSH, FHFB).