writes:
> Typical case - eg. prepaying $12000 on a mortgage now will save $10000
> in interest over the life of the mortgage. But why isn't this
> actually losing $2000? Is it any different than giving a bank $1.20
> today and getting back $1.00 in 10 years?
Your math isn't right. You are prepaying *principal* and as
a result will be paying less *interest*. You'd still pay the
principal in addition regardless of whether you pay it now or
later.
ie. if you prepay $12000 and save $10000 over the life of
the mortgage, you are paying $12000, period. If you didn't
prepay it, you'd pay $22000 over the life of that mortgage,
the same $12000 in principal *plus* the additional $10000.
What I find annoying about this kind of math is that, while
correct, it's less than half the picture. What they leave
out are opportunity cost and time-value-of-money.
What if, instead of prepaying that $12000, you use it for
something more urgent like, say, a more reliable car so
you can get to work with less hassle, repairs, lost time?
Or if you invested that $12000 in something with a higher
return than your rate of mortgage interest?
And re: time-value-of-money, saying $10000 over the "life
of the mortgage" is pretty meaningless. What's the rate
per *year*? Quick back of the envelope says that $12,000
amortized over 30 years at 4.6% annual incurs a total
cumulative interest paid of just over $10,000. The $10,000
number is nowhere near as important as the 4.6% number
and the standard documentation's insistence on highlighting
that less relevant number just irks me.
The other thing not necessarily discussed here is how the
prepayment affects your future payment schedule. It could
shorten the life of your mortgage, or it could lower your
monthly payments. In 99% of the case, a partial principal
prepayment like that goes to shorten the life of your
mortgage. That's great - you save on the interest over the
lifetime of the mortage, and you are done paying off your
loan a lot faster, but until the loan is paid off, it
doesn't lower your payments - in fact, your payments stay
the same and you simply have less liquidity since it's a
lot harder to get that money back out if you needed it
for something else.
--
David S. Meyers, CFP(R)
http://www.MeyersMoney.com
disclaimer: for educational purposes only. This is not financial advice.