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An interest rate is the " rental " price of money. When a resource or asset is borrowed, the borrower pays interest to the lender for the use of it. The interest rate is the price paid for the use of money for a period of time. One type of interest rate is the yield on a bond .
When money is loaned the lender defers consumption (or other use of the money) for a specific period of time. The lender does this in exchange for an expected increase in future income. The expected increase in real income (relative to the amount loaned) is the real interest rate . Note that the real interest rate is calculated by adjusting the actual rate charged (known as the money or nominal interest rate ) to take inflation into account.
Mortgage loan types
There are many types of mortgage loans. The two basic types of amortized loans are the fixed rate mortgage (FRM) and adjustable rate mortgage (ARM).
In a FRM, the interest rate, and hence monthly payment, remains fixed for the life (or term) of the loan. In the US, the term is usually for 10, 15, 20, or 30 years. In the UK the fixed term can be as short as five years, after which the loan reverts to a variable rate (which makes the loan an ARM).
In an ARM, 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 US include the Prime Rate, the LIBOR, and the Treasury Index ("T-Bill"). Other indexes like COFI, COSI, and MTA, are also available but are less popular.