by Greg Grube

Created on: January 06, 2007   Last Updated: March 19, 2010

Mortgage rates can either be fixed for the duration of your loan or can be adjustable. An adjustable rate mortgage is a loan that is set up with an interest rate that changes based on pre-determined criteria, primarily tied to the federal interest rate. If the interest rates are up, then your interest rate on your loan will be higher, if the interest rates are low then the interest rate on your loan will go down.

Adjustable rate mortgages (ARM's) are generally fixed interest rates for a period of time and then become adjustable. Generally speaking, the introductory interest rate for an ARM loan will be lower than a fixed rate mortgage. This is done in order to lower initial payments and allow people to take out larger mortgages, or give them smaller payments for the introductory period. This is attractive to people who may know that their income will be increasing over that period of time.

Whether or not to choose an ARM or a fixed rate mortgage has been debated for as long as there have been ARM's. Though people feel strongly in both camps, simple mathematics can assist you in determining which mortgage is best for you and your personality. Your personality? Yes. Some people are not comfortable with any uncertainty in their lives. The idea of having an uncertain mortgage payment in the future may cause them more stress than the money they are saving is worth. Therefore, factor your own comfort level into the equation.

Generally speaking, ARMs are 2, 3 or 5 years, though they can be longer or shorter. At the end of that period your interest rate will become variable unless you sell your home or refinance. If you think that the likelihood of your selling or refinancing within the period of the ARM is strong, than the lower interest rates of the ARM loan will be of great benefit to you. If you think it is unlikely that you will sell or refinance within that period, then you may not benefit from an ARM.
Bob and Robyn are a young married couple just starting out. Bob is in advertising sales and Robyn is a teacher. Bob is fairly confident that his income will continue to increase over the next several years as he works his way up to becoming an account executive. Robyn's income is more predictable and is on an upward trend. Being a young couple they do not have the finances for large mortgage payments.

Bob and Robyn are presented with two mortgage proposals for their $150,000 mortgage. Proposal one is a 30-year fixed rate mortgage at 6% and the other is a 5-year

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