Translating Today’s Benefits to the Future Suppose you want to know how much money you would have in 5 years if you placed $5,000 in the bank today at an interest rate of 6% compounded annually. future value of a one-time investment. The future value is the accumulated amount of your investment fund at the end of a specified period.

This is an exercise that involves the use of compound interest. Compound interest - Situation where you earn interest on the original investment and any interest that has been generated by that investment previously. Earn interest on your interest First year: $5,000(1+.06) = $5,300 Second year: $5,300(1+.06) = $5,618 Third year: $5,618(1+.06) = $5,955.08 Fourth year: $5,955.08(1+.06) = $6,312.38 Fifth year: $6,312.38(1+.06) = $6,691.13

Effect of Compound Interest

Formula: FV = PV(1 + r)n Compounding Factors: r = interest rate divided by the compounding factor (yearly r / compounding factor) n = number of compounding periods (yearly n * compounding factor) PV = Present Value of your investment Compounding Factors: Yearly = 1 Quarterly = 4 Monthly = 12 Daily = 365

Please note that I will always report r’s and n’s as yearly numbers You will need to determine the compounding factor All of your terms must agree as to time. If you are taking an action monthly (like investing every month), then r and n must automatically be converted to monthly compounding. If you are rounding in time value of money formulas, you need AT LEAST four (4) numbers after the zeros (0) r = .08/12 r=0.006667 (not 0.0067 or 0.007 or etc.)

Yearly compounding PV = 5000 r = .06 n = 5 FV = $5,000(1.06)5 = $6,691.13 Monthly compounding r = (.06/12) = .005 n = 5(12) = 60 FV = $5,000(1+.005)60 = $6,744.25

Implications… _____ frequency of compounding = ___ FV _____ length of investment = ____ FV _____ interest rate = _____ FV

How do the calculations change if the investment is repeated periodically? Suppose you want to know how much money you would have in 24 years if you placed $500 in the bank each year for twenty-four years at an annual interest rate of 8%. future value of a periodic investment or future value of an annuity (stream of payments over time) = FVA

The formula is... where PV = the Present Value of the payment in each period r = interest rate divided by the compounding factor n = number of compounding periods

Let’s try it… $500/year, 8% interest, 24 years, yearly compounding PV = 500 r = .08 n = 24 = 500 (66.7648) = $33,382.38

Let’s try it again… $50/month, 8% interest, 5 years, monthly compounding PV = 50 r = (.08/12) = .006667 n = 5(12) = 60

= 50 (73.4769) = $3673.84 Try again with n=120 FVA=$9147.30

More Practice You have a really cool grandma who gave you $1,000 for your high school graduation. You invested it in a 5-year CD, earning 5% interest. How much will you have when you cash it out if it is compounded yearly? How much will you have if it is compounded monthly? How much will you have if it is compounded daily?

Yearly Compounding 1000(1+.05)5 =$1276.28 Monthly Compounding r = (.05/12) = .004167 n = 5(12) = 60 1000(1+.004167)60 =$1283.36 Daily Compounding r = (.05/365) = .000136986 n = 5(365) = 1825 1000(1+.000136986)1825 =$1284.00

Some more practice... You have decided to be proactive for the future, and will save $25 a month. At the end of 10 years, how much will you have saved, if you earn 8% interest annually? Monthly Compounding FVA = PV = $25 a month r = (.08/12) = .006667 n = (10)(12) = 120 FVA = $4573.65