Lesson 8.2: Absorption and Marginal Costing

Introduction

Welcome to Lesson 8.2 of Foundation Accounting! In this lesson, we will explore two crucial costing methods: absorption costing and marginal costing. Understanding these methods is essential for making informed financial decisions in businesses.

Learning Objectives

• Understand marginal cost and contribution, and the marginal-costing approach.
• Learn about absorption costing: allocating, apportioning and absorbing overheads.
• Know the overhead absorption rates and the treatment of over- and under-absorption.
• Comprehend how to reconcile profit under marginal and absorption costing.
• Identify when each approach is appropriate.

Hook

Imagine you're running a lemonade stand. You need to decide how much to charge for each glass. Should you include all your costs or just the variable costs? This lesson will help you make that decision!

Understanding Marginal Costing

Marginal costing focuses on the costs that change with the level of output, known as variable costs. The marginal cost is the additional cost incurred to produce one more unit of a product. Let's break this down further.

Marginal Cost and Contribution

1. Marginal Cost: This is calculated as:

$$\text{Marginal Cost} = \frac{\Delta \text{Total Cost}}{\Delta \text{Output}}$$

For example, if producing 10 glasses of lemonade costs $10 and producing 11 costs $11, the marginal cost is:

$$\frac{11 - 10}{11 - 10} = \frac{1}{1} = 1$$

So, the marginal cost of producing one more glass is $1.

1. Contribution: This refers to how much each unit sold contributes to covering fixed costs and generating profit. It's calculated as:

$$\text{Contribution} = \text{Selling Price} - \text{Variable Cost}$$

If you sell each glass for $3 and it costs $1 to make, the contribution per glass is:

$$3 - 1 = 2$$

This means each glass sold contributes $2 towards your fixed costs and profit.

The Marginal-Costing Approach

This approach is beneficial when making short-term decisions. For instance, if lemonade sales are slow one day, you might consider reducing the price to sell more. Remember that marginal costing ignores fixed costs when determining the cost of products sold, which simplifies decision-making regarding pricing and production.

Understanding Absorption Costing

Absorption costing, on the other hand, takes all manufacturing costs into account, including both fixed and variable costs. Let's dive deeper into this method.

Allocating, Apportioning, and Absorbing Overheads

1. Allocating Overheads: This means assigning direct costs to specific products. For example, if you spent $500 on lemonade ingredients specifically for a batch, you would allocate that cost directly to that batch.

1. Apportioning Overheads: Apportionment involves distributing common costs (not directly tied to any product) across different products. For instance, if your stand’s rent is $200 and you sell lemonade and cookies, you might choose to split this cost based on sales percentages.

$$\text{Apportioned Rent} = \text{Total Rent} \times \frac{\text{Sales of Product}}{\text{Total Sales}}$$

1. Absorbing Overheads: Absorption means spreading the total costs across all units produced. The overhead absorption rate can be calculated using:

$$\text{Overhead Absorption Rate} = \frac{\text{Total Overheads}}{\text{Total Units Produced}}$$

If your total overheads are $500 and you produce 100 units, your overhead absorption rate is:

$$\frac{500}{100} = 5$$

So, $5 of each unit's cost covers overheads.

Over- and Under-Absorption

When the actual overheads differ from absorbed overheads, you encounter over-absorption or under-absorption.

• Over-Absorption occurs when absorbed overheads exceed the actual overheads. This can be beneficial as it indicates better resource utilization.
• Under-Absorption occurs when actual overheads exceed absorbed overheads. This situation requires scrutiny as it reflects inefficiency.

Reconciling Profit: Marginal vs. Absorption Costing

Understanding both costing methods allows you to reconcile profits effectively. Here’s how:

1. Calculate Profit using Marginal Costing:

$$\text{Profit} = \text{Total Contribution} - \text{Fixed Costs}$$

1. Calculate Profit using Absorption Costing:

$$\text{Profit} = \text{Revenue} - \text{Total Cost (including absorbed overheads)}$$

As a rule of thumb, profit reported under absorption costing can be higher because some of the fixed costs are absorbed into inventory, whereas under marginal costing, all fixed costs are deducted from the contribution.

When to Use Each Approach

• Use Marginal Costing when making short-term operational decisions, like pricing or production levels.
• Use Absorption Costing for financial reporting and inventory valuation, especially for external reporting requirements.

Conclusion

In this lesson, we've explored two vital costing methods in accounting: marginal and absorption costing. Understanding these concepts enables you to evaluate costs effectively, make informed pricing decisions, and assess business profitability. As you advance in your studies, keep these concepts in mind, as they will play a crucial role in your financial acumen!

Study Notes

• Marginal costing focuses on variable costs and is used for short-term decisions.
• Contribution is calculated as Selling Price minus Variable Cost.
• Absorption costing includes all manufacturing costs and is used for financial reporting.
• Overhead absorption rates help allocate costs to units produced.
• Over-absorption occurs when absorbed costs are more than actual costs, under-absorption when the opposite is true.