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It's all about the interest.
To help calculate monthly
payments for loans based on different interest rates, lenders long
ago developed what are known as "amortization
tables." These tables also make it fairly easy to calculate
how much money of each payment is interest, and how much goes towards
the principal balance.
For example, let's calculate the principle
and interest for the very first monthly payment of a 30-year, $100,000
mortgage loan at
7.5 percent interest. According to the amortization tables, the monthly
payment on this loan is fixed at $699.21.
The first step is to calculate
the annual interest by multiplying $100,000 x .075 (7.5 %). This
equals $7,500, which we then divide
by 12 (for the number of months in a year), which equals $625.
If
you subtract $625 from the monthly payment of $699.21, we see that:
$625 of the first payment is interest
$74.21 of the first payment goes towards the principal
Next, if we subtract $74.21 (the first principal payment) from the
$100,000 of the loan, we come up with a new unpaid principal balance
of $99,925.79. To determine the next month's principal and interest
payments, we just repeat the steps already described.
Thus, we now
multiply the new principal balance (99,925.79) times the interest
rate (7.5%) to get an annual interest payment of $7,494.43.
Divided by 12, this equals $624.54. So during the second month's
payment:
$624.54 is interest
$74.67 goes towards the principal.
Note: In Canada, payments are compounded semi-annually instead of
monthly.
Equity
As you can see from the above example, even though you pay a lot
of interest up front, you're also slowly paying down the overall
debt. This is known as building equity. Thus, even if you sell a
house before the loan is paid in full, you only have to pay off the
unpaid principal balance--the difference between the sales price
and the unpaid principle is your equity.
In order to build equity faster--as well as save money on interest
payments--some homeowners choose loans with faster repayment schedules
(such as a 15-year loan).
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