May 10, 1999, revised February 5, 2004
" I consistently pay my mortgage payment two weeks early believing that
this will ultimately result in paying less interest over the life of the
loan. Is this a correct assumption?"
Sorry to have to disillusion you, but your assumption is wrong. The
systems used to keep track of amortized loans understand only one day of
the month -- the first. So whenever you pay, early or late, it is
recorded as if you had paid on the first. This means that you have been
giving the lender two weeks free use of your money. Borrowers who
consistently pay late but within the grace period of 15 days enjoy the
free use of the lender's money for up to 15 days. Virtue is not always
rewarded.
It doesn't have to be done this way, of course. Lenders could credit the
borrower the day a payment is received, as they do with deposits. Many
advantages would follow, including properly rewarding borrowers like you
who pay early, while penalizing those who systematically take advantage
of the grace period by paying late.
Simple interest mortgages work this way. They are good for people like
you, but bad for most other borrowers who are more likely to pay late
than early. See
What Are Simple Interest Mortgages?