What is an Adjustable Rate Mortgage (ARM)?
May 22nd, 2008 by admin
In an ARM (Adjustable Rate Mortgage), the interest rate is fixed for a period of time, after which it will periodically (annually or monthly) adjust up or down to some market index. Common indices in the U.S. include the Prime Rate, the London Interbank Offered Rate (LIBOR), and the Treasury Index (”T-Bill”). Other indexes like 11th District Cost of Funds Index, COSI, and MTA, are also available but are less popular. ARMs usually have an initial interest rate from 0.5% to 2% lower than the average 30-year fixed rate mortgage. The initial fixed rate period is followed by adjustment intervals. For example, a “3/1 ARM” is fixed at an initial low rate for the first 3 years, and then adjusts every year based on an index. Common ARMs are: 1/1, 3/1, 5/1, 7/1, and 10/1.



