# The Internal Rate of Return _ FFM Foundations in Financial Management _ Foundations in Accountancy _ Students _ ACCA _ ACCA Global

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• 8/12/2019 The Internal Rate of Return _ FFM Foundations in Financial Management _ Foundations in Accountancy _ Students

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5/6/2014 The internal rate of return | FFM Foundations in Financial Management | Foundations in Accountancy | Students | ACCA | ACCA Global

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Home > Students > Foundation Level Student Journey > Qualification resources > Foundation-level qualifications >Certified Accounting Technician (CAT) Qualification > FFM Foundations in Financial Management > Technical articles

THE INTERNAL RATE OF RETURN

Study guide references E3(g), (h) and (i) refer explicitly to the Internal Rate of Return (IRR). Not only do

candidates need to be able to perform the calculation, they need to be able to explain the concept of IRR,

how the IRR can be used for project appraisal, and to consider the merits and problems of this method of

investment appraisal. In short, IRR can be examined in both a written or calculation format, within either

section A or section B of the exam.

When this topic is examined, candidates have historically not performed very well, showing a lack of

understanding of how the calculation works and what the IRR is.

WHAT IS THE IRR?

The IRR can be defined as the discount rate which, when applied to the cash flows of a project, produces

a net present value (NPV) of nil. This discount rate can then be thought of as the forecast return for the

project. If the IRR is greater than a preset percentage target, the project is accepted. If the IRR is less

than the target, the project is rejected.

Considering the definition leads us to the calculation. The IRR uses cash flows (not profits) and more

specifically, relevant cash flows for a project. To perform the calculation, we need to take the cash flows of

a project and calculate the discount factor that would produce a NPV of zero.

If the cash flows of a normal (cash outflow followed by a series of cash inflows) project are taken and

discounted at different discount rates, it will be possible to plot the following graph:

The discount rates used are on the x-axis, and the NPV (\$) is on the y-axis. As you can see, the graph is

a smooth curve, which crosses the x-axis. It is this point that we need to calculate the discount rate, which

has produced a NPV of zero this is the IRR.

CALCULATION

It would be very time consuming to calculate the NPV of a project for many different discount factors and

then plot the graph and estimate where the graph crosses the x-axis. Instead, there is a short cut using

the formula:

In order to use the formula then, we need to take the cash flows of the project and discount them twice

once using a discount rate a%, and once using a discount rate b%. If we plot these results on a graph it

would be as follows:

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5/6/2014 The internal rate of return | FFM Foundations in Financial Management | Foundations in Accountancy | Students | ACCA | ACCA Global

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We know that the line joining these two points should be a curve, but the formula approximates the curve

with a straight line and so calculates the point at which a straight line crosses the x-axis and is therefore

the IRR:

The estimation is most accurate if one NPV used in the formula is positive and the other one is negative.

So if a candidate chooses a discount factor and calculates the NPV of the project which turns out to be

negative, a lower discount rate should be chosen for the next discounting so that there is a possibility of

obtaining a positive NPV. However, within an exam situation, if a candidate ends up with two positive or

two negative NPVs, do not waste time calculating a third. Put the values you have into the formula and

complete the calculation; no marks will be lost.

Let us put some figures in. A project has an immediate cash outflow of \$7,000, and then cash inflows of

\$4,000 in years 1 and 2.

If we take the cash flows and discount them at 5% and 20%, the following results are gained. Note that in

an exam situation a candidate could choose any discount rate to start with. In choosing the second

discount rate, though, remember what was said above about trying to gain one positive and one negative

NPV.

If these results are substituted into the formula:

Thus, the IRR is estimated to be 9.9%. This is the return that is forecast for the project. If the target return

was 6%, then the project would be accepted; if the target return was 15%, then the project would be

rejected.

As the cash inflows for the project are an annuity, there is actually a short cut that we can take for thecalculation.

Let's set up the cash flows as an annuity:

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5/6/2014 The internal rate of return | FFM Foundations in Financial Management | Foundations in Accountancy | Students | ACCA | ACCA Global

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For the discount factor (r%) to be the IRR, the NPV must be equal to zero. The table must look as follows:

Looking at the present value column, we can see that (7,000) + 4,000x AF 1-2@r% = 0

Rearranging this gives 7,000/4,000 = AF1-2@r%

ie 1.75 = AF1-2@r%

Looking in the annuity tables, the rate with a two-year annuity closest to 1.75 is 9%.

While this answer is slightly different form the first answer gained, this is because we are always

estimating the IRR, and different estimation methods will give slightly different answers. Either method

would gain full marks in an exam context.

WRITTEN ASPECTS

Candidates need to be able to explain the advantages and disadvantages of the IRR method of project

appraisal.

If the decision was made purely on IRR, both projects would be ranked the same, and no decision could

be made. However, looking at the size of the projects, Project 1 is larger and will generate greater cash

flow and therefore profits for the organisation.

If only IRR 1 was calculated, then the project would be rejected as the target is higher, but if IRR 2 was

calculated, the project would be accepted. So when a project has twoIRRs, there is ambiguity as to

whether the project should be accepted or not.

The method takes account of the time value of money, whereas approaches such as payback do not.

The method uses cash flows, which are real, rather than profits, which can be affected/manipulated by differentaccounting policies.The method gives a result that is easy for management to understand and in terpret a percentage to be comparedto a target.

The method assumes that the net cash inflows generated through the project life will be reinvested to earn the samereturn as the IRR, but this may not be possible in real life.The method ignores the rela tive size of the investments. Consider the following projects, both of which have an IRRof 8%:

When looking at the graphs ea rlier, it was stated that we were considering a normal project. If the project has non-

conventional cash flows for example, cash outflow, inflow and then outflow it may be possible to calculate twoIRRs. This can be shown graphically:

Problems arise if an organ isation is trying to decide between mutually exclusive projects. This is when anorganisation has two or more projects to choose between, and they can only undertake one. Let's say that we haveProject A and Project B. The cash flows for these projects have been d iscounted at various discount rates and thefollowing graph drawn:

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Last updated: 24 Jul 2013

On an IRR basis, Project B should be chosen as the IRR is higher. Butwhat if the organisation actually

had a cost of capital of x%? We can see that Project A actually has the higher NPV at this point, and

therefore Project A would increase the wealth of the shareholders by a greater amount, and should be

chosen. So, with mutually exclusive projects, the IRR method can result in the wrong decision being