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Additional principal payments
on a conventional fixed-rate mortgage reduce the principal
balance but don't reduce the required monthly payment. A
conventional mortgage is self-amortizing, meaning the monthly
payment covers both the interest expense and the repayment of
principal. Each monthly payment is split into two component
parts, interest expense and principal repayment.
Additional principal payments
change the dollar amounts going toward principal and interest in
subsequent mortgage payments, because lowering the outstanding
loan balance reduces the monthly interest expense. The payment
stays the same, but the amount going toward principal increases,
reducing the length of the loan and the total interest expense.
The table below shows a
comparison between a 30-year fixed-rate mortgage with no
additional principal payments, a mortgage with one lump-sum
additional principal payment and a mortgage where a small amount
is added to each monthly mortgage payment.
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|
Conventional 30-year fixed-rate mortgage |
One-time additional principal payment |
With monthly additional principal payment |
|
Loan amount: |
$ 150,000 |
$ 150,000 |
$150,000 |
|
Loan term (months): |
360 |
360 |
360 |
|
Interest rate: |
6.25% |
6.25% |
6.25% |
|
Mortgage payment: |
$ 923.58 |
$923.58 |
$923.58 |
|
Additional principal payment: |
$0 |
$1,000.00 |
$20.00 |
|
Total payments: |
$ 332,487 |
$327,130 |
$319,696 |
|
Interest expense: |
$ 182,487 |
$177,130 |
$169,696 |
|
Life of loan (months): |
360 |
354 |
339 |
|
Life of loan (years): |
30 |
29.5 |
28.25 |
In this example, a $1,000
one-time payment reduced the life of the loan by one-half of a
year and reduced interest expense by more than $5,000. Paying an
extra $20 per month shortened the loan by 1¾ years and saved
more than $12,000 in interest expense. Decide what you are able
to do in your monthly budget, and use the calculator to see how
it impacts your loan.
If your goal is a lower
monthly mortgage payment, additional principal payments won't
help. But if the goal is to pay off your loan early, it's easily
accomplished.
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