July 10, 2000, Reviewed October 16, 2007
Adding an amount to the monthly payment equal to 1/12 of the payment,
and making payments biweekly, both result in making the equivalent of 13
payments a year. But the first will pay off a little earlier because the
extra payments begin sooner.
"I'm considering converting my mortgage to a biweekly payment plan.
Would I do as well if I simply increased the amount of my monthly
payment?"
You'd do better.
For example, the monthly payment on a $100,000 8% loan for 30 years is
$733.77. On a biweekly payment plan, you'd pay half this amount every
two weeks, or 26 payments over a year. This is the equivalent of one
extra monthly payment -- 13 instead of 12. You'd pay off your loan in
277 months, rather than 360 and save $44,160 in interest payments.
Alternatively, divide your monthly payment by 12, and add that amount
($61.15) to your payment every month. The new payment would be $794.92.
Over the year, you would pay an extra $733.77, the same as with the
biweekly. But the loan would pay off in 275 months and you would save
$45,906 in interest.
Why the difference? With a biweekly, it takes a year before additional
payments are made to your principal. Only then do you begin saving on
interest. It takes a year for biweekly payments to add up to an extra
payment. During that year, your money accumulates in an account on which
you receive no interest. If, however, you increase the monthly payment,
principal is reduced by an extra $61.15 starting in the first month, and
interest savings begin in the second month.
You can test this with calculator 2a,
Mortgage Prepayment Calculator: Extra Monthly Payments. To test the
biweekly, add an extra payment equal to the regular monthly payment,
annually beginning in month 12. To test an equivalent increase in
monthly payment, add an extra payment equal to 1/12 of the regular
monthly payment, monthly beginning in month 1.