Adjustable rate mortgage (ARMS) is a new and complex mortgage method in the United States. Its interest rate can vary with the standard financial index. Changes in interest rates can have an impact on the number of monthly payments, loan terms, outstanding loan balances or the combination of the above. In terms of mortgage, it is possible to limit the amount of interest or the amount of permitted changes in payments on a regular or cumulative basis, also known as a variable rate mortgage.