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).
Annual ARM
This loan has a rate that is recalculated once a year.
Monthly ARM
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.

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