| In an Adjustable Rate Mortgage, the interest rate is fixed for a period of time, after which it will periodically (annually or monthly) adjust up or down to some market index. Common indices in the U.S. include the Prime Rate, the LIBOR, and the Treasury Index ("T-Bill"). Other indexes like 11th District Cost of Funds Index11th, COSI, and MTA, are also available but are less popular.
In Florida as in most other states, adjustable rates transfer part of the interest rate risk from the lender to the borrower, and thus are widely used where unpredictable interest rates make fixed rate loans difficult to obtain. Since the risk is transferred, lenders will usually make the initial interest rate of the ARM's note anywhere from 0.5% to 2% lower than the average 30-year fixed rate.
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