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Principles of Accounting, Volume 2: Managerial Accounting

3.1 Explain Contribution Margin and Calculate Contribution Margin per Unit, Contribution Margin Ratio, and Total Contribution Margin

Principles of Accounting, Volume 2: Managerial Accounting3.1 Explain Contribution Margin and Calculate Contribution Margin per Unit, Contribution Margin Ratio, and Total Contribution Margin
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  1. Preface
  2. 1 Accounting as a Tool for Managers
    1. Why It Matters
    2. 1.1 Define Managerial Accounting and Identify the Three Primary Responsibilities of Management
    3. 1.2 Distinguish between Financial and Managerial Accounting
    4. 1.3 Explain the Primary Roles and Skills Required of Managerial Accountants
    5. 1.4 Describe the Role of the Institute of Management Accountants and the Use of Ethical Standards
    6. 1.5 Describe Trends in Today’s Business Environment and Analyze Their Impact on Accounting
    7. Key Terms
    8. Summary
    9. Multiple Choice
    10. Questions
    11. Exercise Set A
    12. Exercise Set B
    13. Thought Provokers
  3. 2 Building Blocks of Managerial Accounting
    1. Why It Matters
    2. 2.1 Distinguish between Merchandising, Manufacturing, and Service Organizations
    3. 2.2 Identify and Apply Basic Cost Behavior Patterns
    4. 2.3 Estimate a Variable and Fixed Cost Equation and Predict Future Costs
    5. Key Terms
    6. Summary
    7. Multiple Choice
    8. Questions
    9. Exercise Set A
    10. Exercise Set B
    11. Problem Set A
    12. Problem Set B
    13. Thought Provokers
  4. 3 Cost-Volume-Profit Analysis
    1. Why It Matters
    2. 3.1 Explain Contribution Margin and Calculate Contribution Margin per Unit, Contribution Margin Ratio, and Total Contribution Margin
    3. 3.2 Calculate a Break-Even Point in Units and Dollars
    4. 3.3 Perform Break-Even Sensitivity Analysis for a Single Product Under Changing Business Situations
    5. 3.4 Perform Break-Even Sensitivity Analysis for a Multi-Product Environment Under Changing Business Situations
    6. 3.5 Calculate and Interpret a Company’s Margin of Safety and Operating Leverage
    7. Key Terms
    8. Summary
    9. Multiple Choice
    10. Questions
    11. Exercise Set A
    12. Exercise Set B
    13. Problem Set A
    14. Problem Set B
    15. Thought Provokers
  5. 4 Job Order Costing
    1. Why It Matters
    2. 4.1 Distinguish between Job Order Costing and Process Costing
    3. 4.2 Describe and Identify the Three Major Components of Product Costs under Job Order Costing
    4. 4.3 Use the Job Order Costing Method to Trace the Flow of Product Costs through the Inventory Accounts
    5. 4.4 Compute a Predetermined Overhead Rate and Apply Overhead to Production
    6. 4.5 Compute the Cost of a Job Using Job Order Costing
    7. 4.6 Determine and Dispose of Underapplied or Overapplied Overhead
    8. 4.7 Prepare Journal Entries for a Job Order Cost System
    9. 4.8 Explain How a Job Order Cost System Applies to a Nonmanufacturing Environment
    10. Key Terms
    11. Summary
    12. Multiple Choice
    13. Questions
    14. Exercise Set A
    15. Exercise Set B
    16. Problem Set A
    17. Problem Set B
    18. Thought Provokers
  6. 5 Process Costing
    1. Why It Matters
    2. 5.1 Compare and Contrast Job Order Costing and Process Costing
    3. 5.2 Explain and Identify Conversion Costs
    4. 5.3 Explain and Compute Equivalent Units and Total Cost of Production in an Initial Processing Stage
    5. 5.4 Explain and Compute Equivalent Units and Total Cost of Production in a Subsequent Processing Stage
    6. 5.5 Prepare Journal Entries for a Process Costing System
    7. Key Terms
    8. Summary
    9. Multiple Choice
    10. Questions
    11. Exercise Set A
    12. Exercise Set B
    13. Problem Set A
    14. Problem Set B
    15. Thought Provokers
  7. 6 Activity-Based, Variable, and Absorption Costing
    1. Why It Matters
    2. 6.1 Calculate Predetermined Overhead and Total Cost under the Traditional Allocation Method
    3. 6.2 Describe and Identify Cost Drivers
    4. 6.3 Calculate Activity-Based Product Costs
    5. 6.4 Compare and Contrast Traditional and Activity-Based Costing Systems
    6. 6.5 Compare and Contrast Variable and Absorption Costing
    7. Key Terms
    8. Summary
    9. Multiple Choice
    10. Questions
    11. Exercise Set A
    12. Exercise Set B
    13. Problem Set A
    14. Problem Set B
    15. Thought Provokers
  8. 7 Budgeting
    1. Why It Matters
    2. 7.1 Describe How and Why Managers Use Budgets
    3. 7.2 Prepare Operating Budgets
    4. 7.3 Prepare Financial Budgets
    5. 7.4 Prepare Flexible Budgets
    6. 7.5 Explain How Budgets Are Used to Evaluate Goals
    7. Key Terms
    8. Summary
    9. Multiple Choice
    10. Questions
    11. Exercise Set A
    12. Exercise Set B
    13. Problem Set A
    14. Problem Set B
    15. Thought Provokers
  9. 8 Standard Costs and Variances
    1. Why It Matters
    2. 8.1 Explain How and Why a Standard Cost Is Developed
    3. 8.2 Compute and Evaluate Materials Variances
    4. 8.3 Compute and Evaluate Labor Variances
    5. 8.4 Compute and Evaluate Overhead Variances
    6. 8.5 Describe How Companies Use Variance Analysis
    7. Key Terms
    8. Summary
    9. Multiple Choice
    10. Questions
    11. Exercise Set A
    12. Exercise Set B
    13. Problem Set A
    14. Problem Set B
    15. Thought Provokers
  10. 9 Responsibility Accounting and Decentralization
    1. Why It Matters
    2. 9.1 Differentiate between Centralized and Decentralized Management
    3. 9.2 Describe How Decision-Making Differs between Centralized and Decentralized Environments
    4. 9.3 Describe the Types of Responsibility Centers
    5. 9.4 Describe the Effects of Various Decisions on Performance Evaluation of Responsibility Centers
    6. Key Terms
    7. Summary
    8. Multiple Choice
    9. Questions
    10. Exercise Set A
    11. Exercise Set B
    12. Problem Set A
    13. Problem Set B
    14. Thought Provokers
  11. 10 Short-Term Decision Making
    1. Why It Matters
    2. 10.1 Identify Relevant Information for Decision-Making
    3. 10.2 Evaluate and Determine Whether to Accept or Reject a Special Order
    4. 10.3 Evaluate and Determine Whether to Make or Buy a Component
    5. 10.4 Evaluate and Determine Whether to Keep or Discontinue a Segment or Product
    6. 10.5 Evaluate and Determine Whether to Sell or Process Further
    7. 10.6 Evaluate and Determine How to Make Decisions When Resources Are Constrained
    8. Key Terms
    9. Summary
    10. Multiple Choice
    11. Questions
    12. Exercise Set A
    13. Exercise Set B
    14. Problem Set A
    15. Problem Set B
    16. Thought Provokers
  12. 11 Capital Budgeting Decisions
    1. Why It Matters
    2. 11.1 Describe Capital Investment Decisions and How They Are Applied
    3. 11.2 Evaluate the Payback and Accounting Rate of Return in Capital Investment Decisions
    4. 11.3 Explain the Time Value of Money and Calculate Present and Future Values of Lump Sums and Annuities
    5. 11.4 Use Discounted Cash Flow Models to Make Capital Investment Decisions
    6. 11.5 Compare and Contrast Non-Time Value-Based Methods and Time Value-Based Methods in Capital Investment Decisions
    7. Key Terms
    8. Summary
    9. Multiple Choice
    10. Questions
    11. Exercise Set A
    12. Exercise Set B
    13. Problem Set A
    14. Problem Set B
    15. Thought Provokers
  13. 12 Balanced Scorecard and Other Performance Measures
    1. Why It Matters
    2. 12.1 Explain the Importance of Performance Measurement
    3. 12.2 Identify the Characteristics of an Effective Performance Measure
    4. 12.3 Evaluate an Operating Segment or a Project Using Return on Investment, Residual Income, and Economic Value Added
    5. 12.4 Describe the Balanced Scorecard and Explain How It Is Used
    6. Key Terms
    7. Summary
    8. Multiple Choice
    9. Questions
    10. Exercise Set A
    11. Exercise Set B
    12. Problem Set A
    13. Problem Set B
    14. Thought Provokers
  14. 13 Sustainability Reporting
    1. Why It Matters
    2. 13.1 Describe Sustainability and the Way It Creates Business Value
    3. 13.2 Identify User Needs for Information
    4. 13.3 Discuss Examples of Major Sustainability Initiatives
    5. 13.4 Future Issues in Sustainability
    6. Key Terms
    7. Summary
    8. Multiple Choice
    9. Questions
    10. Thought Provokers
  15. Financial Statement Analysis
  16. Time Value of Money
  17. Suggested Resources
  18. Answer Key
    1. Chapter 1
    2. Chapter 2
    3. Chapter 3
    4. Chapter 4
    5. Chapter 5
    6. Chapter 6
    7. Chapter 7
    8. Chapter 8
    9. Chapter 9
    10. Chapter 10
    11. Chapter 11
    12. Chapter 12
    13. Chapter 13
  19. Index

Before examining contribution margins, let’s review some key concepts: fixed costs, relevant range, variable costs, and contribution margin. Fixed costs are those costs that will not change within a given range of production. For example, in the current case, the fixed costs will be the student sales fee of $100. No matter how many shirts the club produces within the relevant range, the fee will be locked in at $100. The relevant range is the anticipated production activity level. Fixed costs remain constant within a relevant range. If production levels exceed expectations, then additional fixed costs will be required.

For example, assume that the students are going to lease vans from their university’s motor pool to drive to their conference. A university van will hold eight passengers, at a cost of $200 per van. If they send one to eight participants, the fixed cost for the van would be $200. If they send nine to sixteen students, the fixed cost would be $400 because they will need two vans. We would consider the relevant range to be between one and eight passengers, and the fixed cost in this range would be $200. If they exceed the initial relevant range, the fixed costs would increase to $400 for nine to sixteen passengers.

Variable costs are those costs that vary per unit of production. Direct materials are often typical variable costs, because you normally use more direct materials when you produce more items. In our example, if the students sold 100 shirts, assuming an individual variable cost per shirt of $10, the total variable costs would be $1,000 (100 × $10). If they sold 250 shirts, again assuming an individual variable cost per shirt of $10, then the total variable costs would $2,500 (250 × $10).

Contribution margin is the amount by which a product’s selling price exceeds its total variable cost per unit. This difference between the sales price and the per unit variable cost is called the contribution margin because it is the per unit contribution toward covering the fixed costs. It typically is calculated by comparing the sales revenue generated by the sale of one item versus the variable cost of the item:

Contribution Margin equals Sales minus Variable Costs.

In our example, the sales revenue from one shirt is $15 and the variable cost of one shirt is $10, so the individual contribution margin is $5. This $5 contribution margin is assumed to first cover fixed costs first and then realized as profit.

As you will see, it is not just small operations, such as the accounting club scenario provided in Why It Matters, that benefit from cost-volume-profit (CVP) analysis. At some point, all businesses find themselves asking the same basic questions: How many units must be sold in order to reach a desired income level? How much will each unit cost? How much of the sales price from each unit will help cover our fixed costs? For example, Starbucks faces these same questions every day, only on a larger scale. When they introduce new menu items, such as seasonal specialty drinks, they must determine the fixed and variable costs associated with each item. Adding menu items may not only increase their fixed costs in the short run (via advertising and promotions) but will bring new variable costs. Starbucks needs to price these drinks in a way that covers the variable costs per unit and additional fixed costs and contributes to overall net income. Regardless of how large or small the enterprise, understanding how fixed costs, variable costs, and volume are related to income is vital for sound decision-making.

A picture of the inside of a Starbucks store showing shelves of items for sale.
Figure 3.2 Starbucks. Large corporations like Starbucks use cost-volume-profit analysis to make decisions about their products and services to ensure that they are maximizing their revenues. (credit: modification of “StarbucksVaughanMills” by “Raysonho”/Wikimedia Commons, CC0)

Understanding how to use fixed costs, variable costs, and sales in CVP analyses requires an understanding of the term margin. You may have heard that restaurants and grocery stores have very low margins, while jewelry stores and furniture stores have very high margins. What does “margin” mean? In the broadest terms, margin is the difference between a product or service's selling price and its cost of production. Recall the accounting club’s T-shirt sale. The difference between the sales price per T-shirt and the purchase price of the T-shirts was the accounting club’s margin:

Sales Price $15 less Cost of T-Shirt 10 equals Margin of $5.

Recall that Building Blocks of Managerial Accounting explained the characteristics of fixed and variable costs and introduced the basics of cost behavior. Let’s now apply these behaviors to the concept of contribution margin. The company will use this “margin” to cover fixed expenses and hopefully to provide a profit. Let’s begin by examining contribution margin on a per unit basis.

Unit Contribution Margin

When the contribution margin is calculated on a per unit basis, it is referred to as the contribution margin per unit or unit contribution margin. You can find the contribution margin per unit using the equation shown in Figure 3.2.

Per Unit Sales Price minus Variable Cost per Unit equals Contribution Margin per Unit.

It is important to note that this unit contribution margin can be calculated either in dollars or as a percentage. To demonstrate this principle, let’s consider the costs and revenues of Hicks Manufacturing, a small company that manufactures and sells birdbaths to specialty retailers.

Hicks Manufacturing sells its Blue Jay Model for $1100 and incurs variable costs of $20 per unit. In order to calculate their per unit contribution margin, we use the formula in Figure 3.2 to determine that on a per unit basis, their contribution margin is:

Hicks Manufacturing Blue Jay Model: Sales Price Per Unit $100 minus Variable Cost per Unit 20 equals Contribution Margin per Unit $80.

This means that for every Blue Jay model they sell, they will have $80 to contribute toward covering fixed costs, such as rent, insurance, and manager salaries. But Hicks Manufacturing manufactures and sells more than one model of birdbath. They also sell a Cardinal Model for $75, and these birdbaths incur variable costs of $15 per unit. For the Cardinal Model, their contribution margin on a per unit basis is the $75 sales price less the $15 per unit variable costs is as follows:

Hicks Manufacturing Cardinal Model: Sales Price Per Unit $75 minus Variable Cost per Unit 15 equals Contribution Margin per Unit $60.

This demonstrates that, for every Cardinal model they sell, they will have $60 to contribute toward covering fixed costs and, if there is any left, toward profit. Every product that a company manufactures or every service a company provides will have a unique contribution margin per unit. In these examples, the contribution margin per unit was calculated in dollars per unit, but another way to calculate contribution margin is as a ratio (percentage).

Contribution Margin Ratio

The contribution margin ratio is the percentage of a unit’s selling price that exceeds total unit variable costs. In other words, contribution margin is expressed as a percentage of sales price and is calculated using this formula:

Contribution Margin Ratio equals Contribution Margin per Unit divided by Sales Price per Unit.

For Hicks Manufacturing and their Blue Jay Model, the contribution margin ratio will be

$80 Contribution Margin per Unit divided by $100 Sales Price per Unit equals $0.80.

At a contribution margin ratio of 80%, approximately $0.80 of each sales dollar generated by the sale of a Blue Jay Model is available to cover fixed expenses and contribute to profit. The contribution margin ratio for the birdbath implies that, for every $1 generated by the sale of a Blue Jay Model, they have $0.80 that contributes to fixed costs and profit. Thus, 20% of each sales dollar represents the variable cost of the item and 80% of the sales dollar is margin. Just as each product or service has its own contribution margin on a per unit basis, each has a unique contribution margin ratio. Although this process is extremely useful for analyzing the profitability of a single product, good, or service, managers also need to see the “big picture” and will examine contribution margin in total across all products, goods, or services.

Your Turn

Margin at the Kiosk

You rent a kiosk in the mall for $300 a month and use it to sell T-shirts with college logos from colleges and universities all over the world. You sell each T-shirt for $25, and your cost for each shirt is $15. You also pay your sales person a commission of $0.50 per T-shirt sold in addition to a salary of $400 per month. Construct a contribution margin income statement for two different months: in one month, assume 100 T-shirts are sold, and in the other, assume 200 T-shirts are sold.

Solution

Pertinent Information Per Unit, Contribution Margin Income Statement 100 Units Sold, and Contribution Margin Income Statement 200 Units Sold (respectively): Sales Price (revenue) $25, 2,500, 5,000; Variable Cost 15.50, 1,550, 3,100; Contribution Margin 9.50, 950, 1,900; Fixed Costs: Kiosk Rent 300 and Salary 400, 700, 700; Net Operating Income –, $250, 1,200.

Total Contribution Margin

This “big picture” is gained by calculating total contribution margin—the total amount by which total sales exceed total variable costs. We calculate total contribution margin by multiplying per unit contribution margin by sales volume or number of units sold. This approach allows managers to determine how much profit a company is making before paying its fixed expenses. For Hicks Manufacturing, if the managers want to determine how much their Blue Jay Model contributes to the overall profitability of the company, they can calculate total contribution margin as follows:

Hicks Manufacturing Blue Jay Model, For the Month Ended April, 2019. Units Sold 500 times Contribution Margin per Unit $80 equals Total Contribution Margin $40,000.

For the month of April, sales from the Blue Jay Model contributed $36,000 toward fixed costs. Looking at contribution margin in total allows managers to evaluate whether a particular product is profitable and how the sales revenue from that product contributes to the overall profitability of the company. In fact, we can create a specialized income statement called a contribution margin income statement to determine how changes in sales volume impact the bottom line.

To illustrate how this form of income statement can be used, contribution margin income statements for Hicks Manufacturing are shown for the months of April and May.

In April, Hicks sold 500 Blue Jay Models at $100 per unit, which resulted in the operating income shown on the contribution margin income statement:

Hicks Manufacturing Contribution Margin Income Statement, For the Month Ended April 2019. Sales (500 units at $100 per unit) $50,000 less Variable Cost (500 units at $20 per unit) 10,000 equals Contribution Margin 40,000. Subtract the Fixed Costs of 23,000 to get Operating Income of $17,000.

In May, 750 of the Blue Jay models were sold as shown on the contribution margin income statement. When comparing the two statements, take note of what changed and what remained the same from April to May.

Hicks Manufacturing Contribution Margin Income Statement, For the Month Ended May 2019. Sales (750 units at $100 per unit) $75,000 less Variable Cost (750 units at $20 per unit) 15,000 equals Contribution Margin 60,000. Subtract the Fixed Costs of 23,000 to get Operating Income of $37,000.

Using this contribution margin format makes it easy to see the impact of changing sales volume on operating income. Fixed costs remained unchanged; however, as more units are produced and sold, more of the per-unit sales price is available to contribute to the company’s net income.

Before going further, let’s note several key points about CVP and the contribution margin income statement. First, the contribution margin income statement is used for internal purposes and is not shared with external stakeholders. Secondly, in this specialized income statement, when “operating income” is shown, it actually refers to “net operating income” without regard to income taxes. Companies can also consider taxes when performing a CVP analysis to project both net operating income and net income. (The preparation of contribution margin income statements with regard to taxes is covered in advanced accounting courses; here, we will consider net income as net operating income without regard to taxes.)

Regardless of whether contribution margin is calculated on a per-unit basis, calculated as a ratio, or incorporated into an income statement, all three express how much sales revenue is available to cover fixed expenses and contribute to profit. Let’s examine how all three approaches convey the same financial performance, although represented somewhat differently.

You will recall that the per-unit contribution margin was $80 for a Hicks Blue Jay birdbath. When Hicks sold 500 units, each unit contributed $80 to fixed expenses and profit, which can be verified from April’s income statement:

April total contribution margin $40,000, Per unit contribution margin $80. Total Contribution Margin divided by Per Unit Contribution Margin equals Number of Units Sold equals $40,000 divided by 80 equals 500 units.

Now, let’s use May’s Contribution Margin Income Statement as previously calculated to verify the contribution margin based on the contribution margin ratio previously calculated, which was 80%, by applying this formula:

Total Sales times Contribution Margin Ratio equals Total Contribution Margin. May Total Sales $75,000, Contribution Margin Ratio 80 percent. $75,000 times 0.80 equals $60,000.

Regardless of how contribution margin is expressed, it provides critical information for managers. Understanding how each product, good, or service contributes to the organization’s profitability allows managers to make decisions such as which product lines they should expand or which might be discontinued. When allocating scarce resources, the contribution margin will help them focus on those products or services with the highest margin, thereby maximizing profits.

The Evolution of Cost-Volume-Profit Relationships

The CVP relationships of many organizations have become more complex recently because many labor-intensive jobs have been replaced by or supplemented with technology, changing both fixed and variable costs. For those organizations that are still labor-intensive, the labor costs tend to be variable costs, since at higher levels of activity there will be a demand for more labor usage. For example, assuming one worker is needed for every 50 customers per hour, we might need two workers for an average sales season, but during the Thanksgiving and Christmas season, the store might experience 250 customers per hour and thus would need five workers.

However, the growing trend in many segments of the economy is to convert labor-intensive enterprises (primarily variable costs) to operations heavily dependent on equipment or technology (primarily fixed costs). For example, in retail, many functions that were previously performed by people are now performed by machines or software, such as the self-checkout counters in stores such as Walmart, Costco, and Lowe’s. Since machine and software costs are often depreciated or amortized, these costs tend to be the same or fixed, no matter the level of activity within a given relevant range.

In China, completely unmanned grocery stores have been created that use facial recognition for accessing the store. Patrons will shop, bag the purchased items, leave the store, and be billed based on what they put in their bags. Along with managing the purchasing process, inventory is maintained by sensors that let managers know when they need to restock an item.

In the United States, similar labor-saving processes have been developed, such as the ability to order groceries or fast food online and have it ready when the customer arrives. Another major innovation affecting labor costs is the development of driverless cars and trucks (primarily fixed costs), which will have a major impact on the number of taxi and truck drivers in the future (primarily variable costs). Do these labor-saving processes change the cost structure for the company? Are variable costs decreased? What about fixed costs? Let’s look at this in more detail.

When ordering food through an app, there is no need to have an employee take the order, but someone still needs to prepare the food and package it for the customer. The variable costs associated with the wages of order takers will likely decrease, but the fixed costs associated with additional technology to allow for online ordering will likely increase. When grocery customers place their orders online, this not only requires increased fixed costs for the new technology, but it can also increase variable labor costs, as employees are needed to fill customers’ online orders. Many stores may move cashier positions to online order fulfillment rather than hiring additional employees. Other stores may have employees fill online grocery orders during slow or downtimes.

Using driverless cars and trucks decreases the variable costs tied to the wages of the drivers but requires a major investment in fixed-cost assets—the autonomous vehicles—and companies would need to charge prices that allowed them to recoup their expensive investments in the technology as well as make a profit. Alternatively, companies that rely on shipping and delivery companies that use driverless technology may be faced with an increase in transportation or shipping costs (variable costs). These costs may be higher because technology is often more expensive when it is new than it will be in the future, when it is easier and more cost effective to produce and also more accessible. A good example of the change in cost of a new technological innovation over time is the personal computer, which was very expensive when it was first developed but has decreased in cost significantly since that time. The same will likely happen over time with the cost of creating and using driverless transportation.

You might wonder why a company would trade variable costs for fixed costs. One reason might be to meet company goals, such as gaining market share. Other reasons include being a leader in the use of innovation and improving efficiencies. If a company uses the latest technology, such as online ordering and delivery, this may help the company attract a new type of customer or create loyalty with longstanding customers. In addition, although fixed costs are riskier because they exist regardless of the sales level, once those fixed costs are met, profits grow. All of these new trends result in changes in the composition of fixed and variable costs for a company and it is this composition that helps determine a company’s profit.

As you will learn in future chapters, in order for businesses to remain profitable, it is important for managers to understand how to measure and manage fixed and variable costs for decision-making. In this chapter, we begin examining the relationship among sales volume, fixed costs, variable costs, and profit in decision-making. We will discuss how to use the concepts of fixed and variable costs and their relationship to profit to determine the sales needed to break even or to reach a desired profit. You will also learn how to plan for changes in selling price or costs, whether a single product, multiple products, or services are involved.

Think It Through

Deciding Between Orders

You are evaluating orders from two new customers, but you will only be able to accept one of the orders without increasing your fixed costs. Management has directed you to choose the one that is most profitable for the company. Customer A is ordering 500 units and is willing to pay $200 per unit, and these units have a contribution margin of $60 per unit. Customer B is ordering 1,000 units and is willing to pay $140 per unit, and these units have a contribution margin ratio of 40%. Which order do you select and why?

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