In: Finance
You plan to withdraw $80,000 per year for 30 years after you retire at age 65. You are age 25 now and want to make one deposit at end of each year for 40 years then stop depositing after 40 deposits. To accumulate enough funds to afford the 30 withdrawals, you are presented with 2 options. First is an investment with 8% annual return and second one with 6% annual return. What is the difference between the annual deposit amount of the two options?
With annual return, r = 8%
Step 1: The value of the retirement corpus as of age 65
PMT = 80,000
n = 30
r = 8%
The value of the retirement corpus as of age 65 is $900,622.6675
Step 2: Annual deposit required
FV = The value of the retirement corpus as of age 65
FV = $900,622.6675
n = 40
r = 8%
Annual deposit required with 8% annual return is $3,476.5489476379
Now, we will repeat the same process with annual return of 6%
Step 1: The value of the retirement corpus as of age 65
PMT = 80,000
n = 30
r = 6%
The value of the retirement corpus as of age 65 is $1,101,186.4921333333
Step 2: Annual deposit required
FV = The value of the retirement corpus as of age 65
FV = $1,101,186.4921333333
n = 40
r = 6%
Annual deposit required with 8% annual return is $7,115.3560743036
The difference between the annual deposit amount of the two options is (7,115.3560743036 -3,476.5489476379) = $3,638.8071266657