Investing - What's the Rule of 72?

Have you ever wondered how much some offunds.
your investments will be worth 10 years fromYou can even use this Rule in reverse. For
now? How about 20 years? You can easily figureexample, you are 38 years old, and you'd like to
it out without using a financial calculator. Just useknow how much you'd have to invest today to
the Rule of 72.retire a millionaire.
Let's say you invested $10,000 in a fixed annuityUsing the same Rule (assuming a retirement age
earning 6% a year. In 24 years, your assets willof 65, and an average annual return of 8%), here
be worth about $40,000. How does it work?is how it would work:
The Rule of 72: Divide the number 72 by theStep One: 72 divided by 8% would signify that
interest you earn, and it will give you the numberyour money would double every 9 years.
of years it will take for your money to double.Step 2: At age 65, you want your assets to be
Using the above example, 72 divided by 6 equalsworth $1,000,000, so...
12 years for doubling. Since there are twoStep 3: You work in reverse, going back 9 years
doubling periods in 24 years, the original $10,000for every doubling period.
would be worth $20,000 in 12 years, and $40,000$1,000,000 at age 65 (your goal)
in 24 years.$500,000 at age 56 (9 years earlier)
Using this same Rule, an investment earning 8%$250,000 at age 47,
would double in about 9 years, and a 12%$125,000 at age 38 (lump sum)
investment would double in 6 years.If you invest $125,000 at 8% until age 65 (before
You need to remember that a 6% interest ratetaxes), you would have about $1,000,000 at
in a Certificate of Deposit would not work as wellretirement. This amount would change, of course,
as a 6% annuity. A CD earning 6% would leaveif you invested more than $125,000, or if the
an investor approximately 4% after taxes. Theinterest were higher, or better still, you started
Rule of 72 would only apply to an after-tax yield.investing a little sooner than age 38.
A 6% annuity would be tax-deferred; therefore,Depending on your goals, and your age, you could
the entire 6% would be counted.retire earlier or later than age 65. You don't have
The Rule of 72 works best with fixedto invest a lump sum to retire comfortably. Just
investments, or those with a fairly stable return.have a goal, and a systematic investment plan,
Also, it only works if you reinvest your assets.and your retirement needs will be accomplished.
The Rule does not apply if you withdraw any