Adjustable-Rate Mortgage (ARM)
A mortgage with an interest rate that changes during the life of the loan according to movements in an index rate. Sometimes called AMLs (adjustable mortgage loans) or VRMs (variable-rate mortgages).
This loan has a rate that is recalculated once a year.
With this loan, the interest rate is recalculated every month. Compared to other options, the rate is usually lower on this ARM because the lender is only committing to a rate for a month at a time, so his vulnerability is significantly reduced.
Hybrid ARM (3/1 ARM, 5/1 ARM, 7/1 ARM)
These increasingly popular ARMS—also called 3/1, 5/1 or 7/1—can offer the best of both worlds: lower interest rates (like ARMs) and a fixed payment for a longer period of time than most adjustable rate loans. For example, a "5/1 loan" has a fixed monthly payment and interest for the first five years and then turns into a traditional adjustable-rate loan, based on then-current rates for the remaining 25 years. It's a good choice for people who expect to move (or refinance) before or shortly after the adjustment occurs.