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What You Need to Know: Adjustable Rate Mortgages
Trying to decide what type of mortgage is right for you can be tricky business. So you may be wondering what is an adjustable rate mortgage? An adjustable rate mortgage or ARM, has an interest rate that is linked to an economic index. This means the interest rate, and your payments, adjust up or down as the index changes.
There are three things to know about adjustable rate mortgages: index, margin and adjustment period.
What is the index? The index is a guide that lenders use to measure interest rate changes. Common indexes used by lenders include the activity of one, three, and five-year Treasury securities. Each adjustable rate mortgage is linked to a specific index.
The margin is the lender's cost of doing business plus the profit they will make on the loan. The margin is added to the index rate to determine your total interest rate.
The adjustment period is the period between potential interest rate adjustments. For example, you may see a loan described as a 5-1. The first figure (5) refers to the initial period of the loan, or how long the rate will stay the same. The second number (1) is the adjustment period. This is how often adjustments can be made ... more

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