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How do you calculate Accounting Rate of Return (ARR)?

4:22 PM UTC · December 12, 2024 · 11 min read
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James Lee

Certified financial planner helping individuals achieve long-term wealth goals.

How do you calculate Accounting Rate of Return (ARR)?
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Understanding the Accounting Rate of Return (ARR)

The Accounting Rate of Return (ARR) is a capital budgeting method used to estimate the profitability of an investment. It’s a straightforward calculation that provides a percentage return expected from an investment or asset over its lifetime. While it doesn’t consider the time value of money, it’s a useful tool for quickly comparing different investment opportunities. Let's dive into what ARR is, why businesses use it, and how to calculate it.

What is the Accounting Rate of Return (ARR)?

Defining ARR: A Simple Explanation

The Accounting Rate of Return (ARR) is the percentage rate of return expected on an investment or asset, compared to the initial investment's cost. It helps in gauging the profitability of a project by dividing the average annual profit by the initial investment. Essentially, it answers the question: "What percentage return can I expect annually from this investment?"

Why Businesses Use ARR

Businesses use ARR for several reasons, most notably for quickly comparing the profitability of different projects. It is particularly useful in the initial screening phase of capital budgeting. According to Investopedia, companies use ARR to decide on investments or acquisitions by determining the expected rate of return of each project. It’s a simple metric that doesn’t require complex calculations, making it a convenient tool for initial assessments.

The Formula for Calculating Accounting Rate of Return

Breaking Down the ARR Formula

The basic formula for calculating ARR is:

ARR = Average Annual Profit / Average Investment

This formula uses the average annual profit generated by an investment and divides it by the average investment cost. Let's break down each component to understand how to calculate them.

How to Calculate Average Annual Profit

The average annual profit is calculated by summing up all profits over the investment period and then dividing by the number of years. This gives you the average profit generated by the investment each year. For example, if a project generates a total profit of $500,000 over 5 years, the average annual profit would be $100,000 ($500,000 / 5).

How to Calculate Average Investment

The average investment is typically calculated as the average of the initial investment and the salvage value (or book value at the end of the asset's useful life). The formula is:

Average Investment = (Initial Investment + Salvage Value) / 2

If there is no salvage value, the average investment is simply the initial investment divided by 2. For instance, if a machine costs $200,000 initially and has a salvage value of $20,000, the average investment would be $110,000 (($200,000 + $20,000) / 2).

Step-by-Step Guide to Calculating ARR

Here’s a step-by-step guide to calculating the Accounting Rate of Return:

Step 1: Calculate the Total Profit

First, determine the total profit expected from the investment over its entire life. This involves adding up all the revenues and subtracting all the costs.

Step 2: Determine the Average Annual Profit

Divide the total profit by the number of years of the investment to obtain the average annual profit.

Step 3: Calculate the Average Investment

Calculate the average investment by adding the initial investment to the salvage value (if any) and dividing by 2.

Step 4: Apply the ARR Formula

Finally, divide the average annual profit by the average investment to get the ARR. Multiply the result by 100 to express it as a percentage.

ARR Calculation Example

Let’s illustrate ARR with a couple of examples:

Example 1: Calculating ARR with Consistent Annual Profit

Suppose a company invests $500,000 in a project that is expected to generate a consistent annual profit of $100,000 over 5 years. There is no salvage value.

  1. Total Profit: $100,000/year * 5 years = $500,000
  2. Average Annual Profit: $500,000 / 5 years = $100,000
  3. Average Investment: ($500,000 + $0) / 2 = $250,000
  4. ARR: $100,000 / $250,000 = 0.40 or 40%

So, the ARR for this project is 40%.

Example 2: Calculating ARR with Varying Annual Profit

Consider a project with an initial investment of $300,000 and the following profits over 4 years: Year 1: $60,000, Year 2: $80,000, Year 3: $70,000, and Year 4: $90,000. The salvage value is $50,000.

  1. Total Profit: $60,000 + $80,000 + $70,000 + $90,000 = $300,000
  2. Average Annual Profit: $300,000 / 4 years = $75,000
  3. Average Investment: ($300,000 + $50,000) / 2 = $175,000
  4. ARR: $75,000 / $175,000 = 0.4286 or 42.86%

In this case, the ARR is approximately 42.86%.

Accounting Rate of Return vs. Required Rate of Return

Defining the Required Rate of Return (RRR)

The Required Rate of Return (RRR), also known as the hurdle rate, is the minimum return an investor expects to receive from an investment to compensate for the risk involved. It is a benchmark against which the profitability of an investment is measured. According to Investopedia, the RRR is the minimum acceptable return for an investment, which is influenced by an investor's risk tolerance.

Key Differences Between ARR and RRR

While ARR is a measure of an investment's expected profitability, RRR is the minimum return an investor will accept. ARR is calculated based on accounting profits, while RRR is often determined using models like the Capital Asset Pricing Model (CAPM) or the dividend discount model. ARR is a straightforward percentage, while RRR is a benchmark that varies based on risk and investor expectations.

How to Use Both ARR and RRR in Decision Making

When evaluating a project, the ARR should be compared to the RRR. If the ARR is greater than or equal to the RRR, the project is considered acceptable. If the ARR is lower than the RRR, the project should typically be rejected. For instance, if the ARR of a project is 15%, and the RRR is 12%, the project is likely to be a good investment.

Advantages of Using the Accounting Rate of Return

Simplicity and Ease of Calculation

One of the main advantages of ARR is its simplicity. The formula is easy to understand and calculate, making it accessible to a wide range of users. This allows for quick assessments of investment opportunities without the need for complex financial modeling.

Quick Comparison of Project Profitability

ARR enables a quick and easy comparison of the profitability of different projects. By expressing returns as a percentage, it’s simple to rank projects and identify those that offer the highest expected returns. This makes it a useful tool for quickly prioritizing investment options.

Usefulness in Initial Screening of Projects

ARR is particularly useful in the initial screening phase of capital budgeting. It helps filter out projects that are unlikely to meet the required return, allowing companies to focus on the most promising opportunities. This saves time and resources by quickly identifying potentially non-profitable ventures.

Disadvantages and Limitations of the Accounting Rate of Return

Ignoring the Time Value of Money

A significant limitation of ARR is that it ignores the time value of money. This concept acknowledges that money available today is worth more than the same amount in the future due to its earning potential. According to the Corporate Finance Institute, ARR assumes that accounting income in future years has the same value as income in the current year, which is not accurate.

Failure to Account for Cash Flow Timing

ARR does not consider the timing of cash flows. It treats all profits equally, regardless of when they are received. Projects that generate more cash flow early on may be more valuable than projects with delayed cash flows, but ARR doesn't reflect this difference. This lack of cash flow timing consideration can lead to suboptimal investment decisions.

Not Considering Long-Term Project Risks

ARR does not account for the increased risk associated with long-term projects. Longer projects often carry higher uncertainty and potential risks, which are not factored into the ARR calculation. This can result in overestimating the profitability of long-term investments.

Reliance on Accounting Profits

ARR relies on accounting profits, which can be subject to manipulation and accounting practices. Unlike cash flows, accounting profits may not accurately reflect the true economic performance of a project. This can lead to distorted results and potentially flawed decision-making.

How Depreciation Affects the Accounting Rate of Return

The Impact of Depreciation on ARR

Depreciation is an accounting method that spreads the cost of an asset over its useful life. It affects ARR because it reduces the reported profit, which in turn reduces the ARR. Depreciation is treated as an expense, and therefore, it lowers the annual profit used in the ARR calculation. According to Investopedia, depreciation reduces the value of an asset or profit of a company, thus lowering the return of an investment or project.

Decision Rules for Using the Accounting Rate of Return

When to Accept a Project Based on ARR

A project is generally accepted if its ARR is equal to or greater than the company's required rate of return (RRR). This ensures that the project is expected to generate a return that meets or exceeds the minimum acceptable level for the company. If ARR is below the RRR, the project should typically be rejected.

Comparing Multiple Projects Using ARR

When comparing multiple projects, the project with the highest ARR is generally preferred, provided that its ARR is also equal to or greater than the RRR. This rule helps in prioritizing projects that offer the highest expected profitability. However, it's essential to consider other factors alongside ARR, such as the project's risk profile and alignment with strategic goals.

ARR vs. IRR: Key Differences

Understanding Internal Rate of Return (IRR)

The Internal Rate of Return (IRR) is another capital budgeting metric that calculates the discount rate at which the net present value (NPV) of all cash flows from a project equals zero. It represents the expected rate of return on an investment. Unlike ARR, IRR considers the time value of money. If you want to learn more about IRR, check out our guide on IRR.

Why IRR is a Discounted Cash Flow Method

IRR is a discounted cash flow method because it takes into account the time value of money by discounting future cash flows back to their present value. This makes IRR a more sophisticated tool for evaluating investments than ARR, which does not consider the timing of cash flows.

Contrasting ARR and IRR

The primary difference between ARR and IRR is that ARR is a non-discounted cash flow method, while IRR is a discounted cash flow method. ARR is simpler to calculate but does not consider the time value of money, whereas IRR is more complex but provides a more accurate assessment of an investment's profitability by considering the timing of cash flows. ARR is best for quick, initial assessments, while IRR is more appropriate for detailed analysis.

Conclusion: Is ARR a Useful Tool?

Summarizing the Strengths and Weaknesses of ARR

The Accounting Rate of Return is a useful tool for quickly evaluating project profitability due to its simplicity and ease of calculation. It allows for easy comparison between different projects and is beneficial for initial screening. However, its major weaknesses include ignoring the time value of money, failing to account for cash flow timing, and not considering long-term project risks.

The Importance of Using ARR in Conjunction with Other Tools

While ARR can provide a quick snapshot of a project’s potential return, it should not be used in isolation. It is essential to use ARR in conjunction with other capital budgeting tools, such as the Net Present Value (NPV) and Internal Rate of Return (IRR), to gain a more comprehensive and accurate assessment of a project’s viability. For instance, you can explore the concept of Profitability Index which is another financial tool for evaluating investments. Using a combination of these tools will provide a more balanced view, helping in making better financial decisions.


Key Takeaways

  • The Accounting Rate of Return (ARR) is a simple method for assessing project profitability by dividing the average annual profit by the average investment.
  • ARR does not consider the time value of money or cash flow timing, making it less accurate than discounted cash flow methods like IRR.
  • ARR is most useful for quick, initial comparisons of projects but should be used with other financial tools for detailed analysis.
  • Depreciation reduces the ARR by lowering the annual profit, and the ARR should always be compared to the Required Rate of Return (RRR) before accepting a project.
  • While ARR has limitations, it remains a valuable tool for its simplicity and ease of use in the initial stages of investment evaluation.