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Adjustable Rate Mortgage
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An
adjustable rate mortgage (ARM), variable rate mortgage or floating
rate mortgage is a mortgage loan where the interest rate on the note
is periodically adjusted based on an index. This is done to ensure
a steady margin for the lender, whose own cost of funding will usually
be related to the index. Consequently, payments made by the borrower
may change over time with the changing interest rate (alternatively,
the term of the loan may change). This is not to be confused with
the graduated payment mortage, which offers changing payment amounts
but a fixed interest rate. Other forms of mortgage loan include interest
only mortgage, fixed rate mortgage, negative amortization mortgage,
and balloon payment mortgage. Adjustable rates transfer part of the
interest rate risk from the lender to the borrower. They can be used
where unpredictable interest rates make fixed rate loans difficult
to obtain. The borrower benefits if the interest rate falls and loses
out if interest rates rise. Adjustable rate mortgages are characterized
by their index and limitations on charges (caps). In many countries,
adjustable rate mortgages are the norm, and in such places, may simply
be referred to as mortgages. |
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Index used on ARM's
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All
adjustable rate mortgages have an adjusting interest rate tied to
an index.
Five common indices in the United States are:
(1) 11th District Cost of Funds Index (COFI)
(2) London Interbank Offered Rate (LIBOR)
(3) 12-month Treasury Average Index (MTA)
(4) Constant Maturity Treasury (CMT)
(5) National Average Contract Mortgage Rate Bank Bill Swap Rate (BBSW)
In some countries, banks may publish a prime lending rate which is
used as the index. The index may be applied in one of three ways:
directly, on a rate plus margin basis, or based on index movement.
A directly applied index means that the interest rate changes exactly
with the index. In other words, the interest rate on the note exactly
equals the index. Of the above indices, only the contract rate index
is applied directly.[1] To apply an index on a rate plus margin basis
means that the interest rate will equal the underlying index plus
a margin. The margin is specified in the note and remains fixed over
the life of the loan. For example, a mortgage interest rate may be
specified in the note as being LIBOR plus 2%, 2% being the margin
and LIBOR being the index. The final way to apply an index is on a
movement basis. In this scheme, the mortgage is originated at an agreed
upon rate, then adjusted based on the movement of the index. Unlike
direct or index plus margin, the initial rate is not tied to any index;
only the adjustments are tied to an index. |
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Reason for ARM's
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many countries, banks or similar financial institutions are the primary
originators of mortgages. For banks that are funded from customer
deposits, the customer deposits will typically have much shorter terms
than residential mortgages. If a bank were to offer large volumes
of mortgages at fixed rates but to derive most of its funding from
deposits (or other short-term sources of funds), the bank would have
an asset-liability mismatch: in this case, it would be running the
risk that the interest income from its mortgage portfolio would be
less than it needed to pay its depositors. In the United States, some
argue that the savings and loan crisis was in part caused by this
problem, that the savings and loans companies had short-term deposits
and long-term, fixed rate mortgages, and were caught when Paul Volcker
raised interest rates in the early 1980s. To avoid this risk, many
mortgage originators will sell or securitize their mortgages. Banking
regulators pay close attention to asset-liability mismatches to avoid
such problems, and place tight restrictions on the amount of long-term
fixed-rate mortgages that banks may hold (in relation to their other
assets). In this perspective, banks and other financial institutions
offer adjustable rate mortgages because it reduces risk and matches
their sources of funding. For the borrower, adjustable rate mortgages
may be less expensive, but at the price of higher risk borne by the
borrower. In 'most' situations, short-term borrowing is less expensive
than long-term borrowing, due to the slope of the yield curve. If
rates are expected to rise, however, or the yield curve is sloped
down (long-term money is less expensive than short-term money) borrowers
may end up paying more over the life of the mortgage loan. |
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