Adjustable-rate
mortgages (ARMs) differ from fixed-rate mortgages
in that the interest rate and monthly payment can
change over the life of the loan. ARMs also generally
have lower introductory interest rates vs. fixed-rate
mortgages. Before deciding on an ARM, key factors
to consider include how long you plan to own the property,
and how frequently your monthly payment may change.
Why
choose an adjustable-rate mortgage?
The low initial interest rates offered by ARMs make
them attractive during periods when interest rates
are high, or when homeowners only plan to stay in
their home for a relatively short period. Similarly,
homebuyers may find it easier to qualify for an
ARM than a traditional loan. However, ARMs are not
for everyone. If you plan to stay in your home long-term
or are hesitant about having loan payments that
shift from year-to-year, then you may prefer the
stability of a fixed-rate mortagage.
Components
of adjustable-rate mortgages
Adjustable-rate mortgages have three primary componeàå%»
an index, margin, and calculated interest rate.
- Index
The interest rate for an ARM is based on an index
that measures the lender's ability to borrow money.
While the specific index used may vary depending
on the lender, some common indexes include U.S.
Treasury Bills and the Federal Housing Finance
Board's Contract Mortgage Rate. One thing all
indexes have in common, however, is that they
cannot be controlled by the lender.
- Margin
The margin (also called the "spread")
is a percentage added to the index in order to
cover the lender's administrative costs and profit.
Though the index may rise and fall over time,
the margin usually remains constant over the life
of the loan.
- Calculated
interest rate
By adding the index and margin together, you arrive
at the calculated interest rate, which is the
rate the homeowner pays. It is also the rate to
which any future rate adjustments will apply (rather
than the "teaser rate," explained below).
Adjustment
periods and teaser rates
Because the interest rate for an ARM may change
due to economic conditions, a key feature to ask
your lender about is the adjustment period--or how
often your interest rate may change. Many ARMS have
one-year adjustment periods, which means the interest
rate and monthly payment is recalculated (based
on the index) every year. Depending on the lender,
longer adjustment periods are also available.
An
ARM can also have an initial adjustment period based
on a "teaser rate," which is an artificially
low introductory interest rate offered by a lender
to attract homebuyers. Usually, teaser rates are
good for 6 months or a year, at which point the
loan reverts back to the calculated interest rate.
Remember, too, that most lender will not use the
teaser rate to qualify you for the loan, but instead
use a 7.5% interest rate (or calculated interest
rate if it is lower).
Rate
caps
To protect homebuyers from dramatic rises in the
interest rate, most ARMs have "caps" that
govern how much the interest rate may rise between
adjustment periods, as well as how much the rate
may rise (or fall) over the life of the loan. For
example, an ARM may be said to have a 2% periodic
cap, and a 6% lifetime cap. This means that the
rate can rise no more than 2% during an adjustment
period, and no more than 6% over the life of the
loan. The lifetime cap almost always applies to
the calculated interest rate and not the introductory
teaser rate.
Payment
caps and negative amortization
Some ARMs also have payment caps. These differ from
rate caps by placing a ceiling on how much your
payment may rise during an adjustment period. While
this may sound like a good thing, it can sometimes
lead to real trouble.
For
example, if the interest rate rises during an adjustment
period, the additional interest due on the loan
payment may exceed the amount allowed by the payment
cap--leading to negative amortization. This means
the balance due on the loan is actually growing,
even though the homeowner is still making the minimum
monthly payment. Many lenders limit the amount of
negative amortization that may occur before the
loan must be restructured, but it's always wise
to speak with your lender about payment caps and
how negative amortization will be handled.