What is a Discounted Payback Period?
The discounted payback period is a budgeting method that considers not only the number of years it takes for the company to recover its investment (after considering inflation, interest and other matters affected by the investment), but also the time value of money.
In using this method, each investor determines his/her own discounted payback period rule, making it a highly subjective method. In general, however, a short-term investor uses a short number of years, or even months, for his/her discounted payback period rules, while a long-term investor measures his/her rules in years, or even decades.
Some of the good characteristics of the Discounted Payback Period are:
- Adjusts for time value of money
- Consistent with the wealth maximization goal
- Assumes realistic reinvestment of intermediate cash inflow
The discounted payback period answers the limitations of the simple and traditional payback period method, which plainly considers only the time required for cumulative cash inflows to recover the cash outflows, or the investment of the project.
Let us consider, for example, Mr. Harold Beige's project. Leviste spends $80,000 on this project. The annual cash inflow is $20,000. The simple payback period is 4 years computed as $80,000 divided by $20,000.
As seen above, payback period does not consider the time value of money, because the said annual return is not discounted. In order to correct this, we use the discounted cash flow in calculating the payback period.
In using the discounted payback period on Mr. Beige's project, at a 7% interest rate, the $80,000 cash investment will actually be recovered after 4.85 years as computed below. In discounting the annual cash flows in the illustration, they are simply multiplied by their present value factors.
Year Annual Cash Flow Present Value Factor Discounted Cash Flow
- First year - $20,000 multiplied by .9346 $18,692
- Second Year- $20,000 multiplied by .8734 $17,468
- Third Year -$20,000 multiplied by ..8163 $16,326
- Fourth Year - $20,000 multiplied by .7629 $15,240
- Fifth Year - $20,000 multiplied by .7130 %14,260
At the end of the fourth year, the total discounted cash flows amounted to only $67,726 or $18,692 + $17,468 + $16,326 + $15,240 + $14,260, so an additional $12,274 on the fifth year is added to $67,726 in order to arrive at the amount equal to $80,000, the cash outlay of Leviste. .85 is obtained by dividing $67,726 over $80,000.
To summarize, therefore, the discounted payback of Mr. Beige's project is approximately 4.85 years, as opposed to 4 years under the simple payback. As the required rate of return increases, the distortion between simple payback and discounted payback grows. We can now prove that the discounted payback period method is the appropriate way of knowing how many years a company is able to recover its investment.