💰Mortgage & Financing
Index (ARM)
Definition
The benchmark interest rate used to calculate adjustable-rate mortgage (ARM) adjustments. Common indices include SOFR (Secured Overnight Financing Rate), Prime Rate, or Treasury rates. Your ARM rate = Index + Margin.
Example
If SOFR is 4.8% and your ARM margin is 2.5%, your fully indexed rate is 7.3%. Rate caps may prevent you from reaching this rate immediately at reset.