Adjustable-Rate Mortgage (ARM) (ARM)

A mortgage that does not have a fixed interest rate. The rate changes during the life of the loan based on movements in an index rate, such as the rate for Treasury securities or the Cost of Funds Index. ARMs usually offer a lower initial interest rate than fixed-rate loans. The interest rate fluctuates over the life of the loan based on market conditions, but the loan agreement generally sets maximum and minimum rates. When interest rates increase, generally your loan payments increase; and when interest rates decrease, your monthly payments may decrease. For more information on ARMs, see the Consumer Handbook on Adjustable-Rate Mortgages.

A variable or flexible rate mortgage with an interest rate that varies according to the financial index it is based upon. To limit the borrower's risk, the ARM may have a payment or rate cap. See also: cap.

A mortgage loan that does not have a fixed interest rate. During the life of the loan the interest rate will change based on the index rate. Also referred to as adjustable mortgage loans (AMLs) or variable-rate mortgages (VRMs).

A mortgage loan that allows the interest rate to be changed, usually based on an established index, at specific intervals over the maturity of the loan.

A mortgage that does not have a fixed interest rate. The rate changes during the life of the loan based on movements in an index rate, such as the rate for Treasury securities or the Cost of Funds Index. ARMs usually offer a lower initial interest rate than fixed-rate loans. The interest rate fluctuates over the life of the loan based on market conditions, but the loan agreement generally sets maximum and minimum rates. When interest rates increase, generally your loan payments increase; when interest rates decrease, your monthly payments may decrease.

An adjustable rate mortgage is a long-term loan you use to finance a real estate purchase, typically a home.

Unlike a fixed-rate mortgage, where the interest rate remains the same for the term of the loan, the interest rate on an ARM is adjusted, or changed, during its term.

The initial rate on an ARM is usually lower than the rate on a fixed-rate mortgage for the same term, which means it may be easier to qualify for an ARM. You take the risk, however, that interest rates may rise, increasing the cost of your mortgage. Of course, it's also possible that the rates may drop, decreasing your payments.

The rate adjustments, which are based on changes in one of the publicly reported indexes that reflect market rates, occur at preset times, usually once a year but sometimes less often. Typically, rate changes on ARMs are capped both annually and over the term of the loan, which helps protect you in the case of a rapid or sustained increase in market rates.

However, certain ARMs allow negative amortization, which means additional interest could accumulate on the outstanding balance if market rates rose higher than the cap. That interest would be due when the loan matured or if you want to prepay.

A mortgage that does not have a fixed interest rate. The rate changes during the life of the loan based on movements in an index rate, such as the rate for Treasury securities or the Cost of Funds Index. ARMs usually offer a lower initial interest rate than fixed-rate loans. The interest rate fluctuates over the life of the loan based on market conditions, but the loan agreement generally sets maximum and minimum rates. When interest rates increase, generally your loan payments increase; and when interest rates decrease, your monthly payments may decrease.

a mortgage loan with an interest rate that is subject to change and is not fixed at the same level for the life of the loan. These types of loans usually start off with a lower interest rate but can subject the homeowner to payment uncertainty when the rate adjusts.