AQA A-Level Accounting (7127)

## Learning Outcomes

- Understand how **absorption costing** and **activity based costing (ABC)** are used to calculate a product cost for pricing
- Calculate a selling price using **cost-plus pricing** under both methods
- Distinguish clearly between **overhead absorption rates** and **cost driver rates**
- Explain why the same product can have a different selling price under absorption costing and ABC
- Avoid common errors such as confusing **mark-up** with **margin**
- Assess when absorption costing may be suitable and when ABC may improve pricing decisions

## AQA A-Level Accounting (7127) Syllabus

For the AQA A-Level Accounting (7127), you are expected to understand pricing decisions using absorption costing and activity based costing, with a focus on the following syllabus points:

- Know how to calculate the **total cost per unit** using absorption costing
- Know how to calculate the **total cost per unit** using activity based costing
- Calculate a **selling price** by applying a mark-up to cost
- Identify the difference between **traditional overhead absorption** and **ABC overhead attribution**
- Explain why different overhead treatments can lead to different selling prices
- Understand the difference between **mark-up on cost** and **margin on selling price**
- Assess the benefits and limits of absorption costing and ABC for pricing decisions

## Test Your Knowledge

_Attempt these questions before reading this article. If you find some difficult or cannot remember the answers, look more closely at that area during your revision._

1. How is an **overhead absorption rate** calculated?
2. What is the difference between **absorption costing** and **ABC** when pricing a product?
3. How do you calculate a selling price using a **25% mark-up** on cost?
4. Why might ABC produce a different selling price from absorption costing?
5. What is the difference between **mark-up** and **margin**?

## Introduction

Pricing decisions are a major part of management accounting. A business may produce a technically correct product cost, but if overheads are assigned badly, the selling price may be too high to compete or too low to recover costs properly.

In this topic, the exam focus is direct: calculate the product cost using either **absorption costing** or **activity based costing**, then use that figure to calculate the selling price. After the calculation, stronger answers explain what the figures mean and judge which method is more suitable for the business.

> **Key Term: absorption costing**
> A costing method that includes direct costs and absorbed production overheads in the total cost of a product.

### Pricing with absorption costing

Absorption costing is often called a **full cost** approach. It aims to include all production costs in the cost per unit.

The usual process is:

1. Identify direct costs per unit
2. Calculate the overhead absorption rate
3. Absorb production overhead into the product
4. Add direct costs and absorbed overhead to get total cost per unit
5. Apply the required mark-up to find selling price
   > **Key Term: overhead absorption rate (OAR)**
   > A rate used to charge production overheads to output, usually based on labour hours, machine hours or units.

The formula is:

$$
\text{OAR}=\frac{\text{Budgeted production overhead}}{\text{Budgeted activity level}}
$$

The absorbed overhead for a product is:

$$
\text{Overhead absorbed}=\text{OAR} \times \text{activity used}
$$

The total cost per unit under absorption costing is:

$$
\text{Direct materials}+\text{Direct labour}+\text{Direct expenses}+\text{absorbed production overhead}
$$

#### Worked example: absorption costing and selling price

A business makes Product P.

- Direct materials per unit = £18
- Direct labour per unit = £12
- Budgeted production overhead = £60,000
- Budgeted machine hours = 15,000
- Each unit uses 2 machine hours
- Mark-up = 25% on cost

Step 1: Calculate OAR

$$
\text{OAR}=\frac{£60,000}{15,000\text{ machine hours}}=£4 \text{ per machine hour}
$$

Step 2: Calculate absorbed overhead per unit

$$
2 \text{ machine hours} \times £4 = £8
$$

Step 3: Calculate total cost per unit

$$
£18 + £12 + £8 = £38
$$

Step 4: Calculate selling price using mark-up

$$
£38 \times 1.25 = £47.50
$$

So the **selling price = £47.50 per unit**.

> **Key Term: cost-plus pricing**
> A pricing method in which a profit mark-up is added to cost to calculate the selling price.

This method is simple and quick. It is often suitable where products are similar and overheads are fairly predictable.

> **Test Tip:** In calculation questions, label each step: OAR, overhead absorbed, total cost per unit, selling price. Clear workings earn marks even if the final figure is wrong.

#### Common student errors in absorption pricing

Students often:

- use the wrong activity base, such as labour hours instead of machine hours
- divide actual overhead by actual activity when the question expects a budgeted OAR
- add the mark-up wrongly, for example adding 25 instead of 25%
- price from prime cost only, missing absorbed overhead entirely

### Pricing with activity based costing

ABC still uses direct costs in the normal way, but overheads are treated differently. Instead of one broad basis such as labour hours, overheads are split into activities and then assigned using cost drivers.

This gives a more detailed product cost, especially when products use support activities in different ways.

> **Key Term: activity based costing (ABC)**
> A costing method that attributes overheads to products using activities and cost drivers.

The steps are:

1. Group overheads into **cost pools**
2. Identify a suitable **cost driver** for each pool
3. Calculate a cost driver rate
4. Attribute overheads to the product based on its use of each activity
5. Add direct costs to get total cost per unit
6. Apply mark-up to calculate selling price
   > **Key Term: cost pool**
   > A group of overhead costs collected for the same activity.
   >
   > **Key Term: cost driver**
   > The factor that causes an activity cost to change, such as number of setups, purchase orders or inspections.

The formula is:

$$
\text{Cost driver rate}=\frac{\text{Total cost pool}}{\text{Total quantity of cost driver}}
$$

#### Worked example: ABC and selling price

A business makes Product Q in batches of 100 units.

Direct costs per unit:

- Direct materials = £20
- Direct labour = £15

Production overhead cost pools:

- Setup costs = £24,000, driven by number of setups
- Inspection costs = £12,000, driven by number of inspections

Total annual driver volumes:

- Setups = 120
- Inspections = 240

Product Q usage:

- 3 setups
- 5 inspections
- Batch size = 100 units

Mark-up = 25% on cost

Step 1: Calculate setup cost driver rate

$$
\frac{£24,000}{120}=£200 \text{ per setup}
$$

Step 2: Calculate inspection cost driver rate

$$
\frac{£12,000}{240}=£50 \text{ per inspection}
$$

Step 3: Attribute overheads to the batch

Setup overhead:

$$
3 \times £200 = £600
$$

Inspection overhead:

$$
5 \times £50 = £250
$$

Total ABC overhead for batch:

$$
£600 + £250 = £850
$$

Step 4: Convert overhead to per-unit basis

$$
\frac{£850}{100 \text{ units}} = £8.50 \text{ per unit}
$$

Step 5: Calculate total cost per unit

$$
£20 + £15 + £8.50 = £43.50
$$

Step 6: Apply mark-up

$$
£43.50 \times 1.25 = £54.375
$$

So the **selling price = £54.38 per unit** if rounded to the nearest penny.

ABC gives a more detailed overhead charge because it reflects the actual support activity used by Product Q.

> **Test Tip:** In ABC questions, always calculate the overhead for the batch or product first, then divide by units if the question asks for a unit cost. Many students forget this final division.

#### Common student errors in ABC pricing

Students often:

- choose the wrong driver from the data
- forget to divide batch overhead by the number of units in the batch
- mix up direct costs with overhead costs
- use one combined driver rate instead of separate rates for each cost pool

### Absorption costing and ABC compared for pricing decisions

The exam often asks you to compare the selling prices produced by both methods. The direct costs may be the same, but the overhead treatment changes the unit cost.

Here is the key distinction:

| Feature                              | Absorption costing                             | ABC                              |
| ------------------------------------ | ---------------------------------------------- | -------------------------------- |
| Overhead basis                       | One broad basis, often labour or machine hours | Several activity-based drivers   |
| Simplicity                           | Easier                                         | More detailed                    |
| Accuracy where overheads are complex | Lower                                          | Higher                           |
| Best suited to                       | Similar products, simpler production           | Diverse products, high overheads |

If one product uses many setups, inspections or orders, ABC may show a much higher cost than absorption costing. That could lead to a higher selling price under the same mark-up.

#### Side-by-side mini comparison

Suppose a product has:

- Direct costs = £30
- Absorption overhead per unit = £6
- ABC overhead per unit = £10
- Mark-up = 20%

Absorption costing selling price:

$$
(£30 + £6) \times 1.20 = £43.20
$$

ABC selling price:

$$
(£30 + £10) \times 1.20 = £48.00
$$

The difference is entirely due to the overhead treatment.

This matters because the business may be:

- **undercosting** the product under traditional absorption costing
- charging too low a price
- making less profit than expected

Or the reverse may happen: absorption costing may overcost a product and produce an uncompetitive price.

### Mark-up and margin: a high-frequency exam trap

Many students lose marks here.

> **Key Term: mark-up**
> Profit expressed as a percentage of cost.
>
> **Key Term: margin**
> Profit expressed as a percentage of selling price.

If cost = £100 and mark-up = 25%:

$$
\text{Selling price} = £100 \times 1.25 = £125
$$

Profit = £25

Margin is:

$$
\frac{£25}{£125} \times 100 = 20\%
$$

So **25% mark-up is not the same as 25% margin**.

If a question gives a **margin** instead of a mark-up, the formula changes:

$$
\text{Selling price}=\frac{\text{cost}}{1-\text{margin \%}}
$$

Example with cost £100 and margin 20%:

$$
\frac{£100}{0.8}=£125
$$

#### Common student errors here

Students often:

- treat margin as if it were mark-up
- add margin directly to cost
- use selling price as the base for mark-up calculations

### How to structure an evaluative answer

For longer “assess” or “compare” questions, calculation alone is not enough.

Start with the **financial evidence**:

- total cost per unit under each method
- selling price under each method
- size of the difference
- likely effect on profitability or competitiveness

Then discuss **non-financial factors**:

- how complex the product range is
- whether overheads are high and varied
- how costly and time-consuming ABC would be to maintain
- whether customers would accept the higher price
- whether the market is competitive

Then explain **limitations** without being vague:

- absorption costing may be acceptable if products are similar and one driver explains most overheads
- ABC may be more accurate, but the benefit must exceed the cost of collecting detailed data
- even an accurate cost-based price may still be too high for the market

A strong judgement sounds like this: ABC is likely to improve pricing decisions if overheads are significant and products consume activities unevenly, but it should only be adopted if the extra accuracy is worth the extra administrative cost.

## Key Point Checklist

_This article has covered the following key knowledge points:_

- Absorption costing uses direct costs plus absorbed production overheads to calculate product cost
- The overhead absorption rate is budgeted overhead divided by budgeted activity
- Overhead absorbed equals OAR multiplied by the activity used by the product
- ABC uses cost pools and cost drivers to attribute overheads more precisely
- A cost driver rate is total cost pool divided by total driver quantity
- Under ABC, overheads are first attributed to the product or batch, then converted to a unit cost if needed
- Selling price under cost-plus pricing is based on cost plus a mark-up
- Mark-up is profit as a percentage of cost
- Margin is profit as a percentage of selling price
- The same mark-up percentage can produce different selling prices if absorption costing and ABC give different unit costs
- Absorption costing is simpler, but ABC may be more accurate where overheads are high and products are diverse
- In evaluative answers, use both numerical evidence and business context before giving a judgement

## Key Terms and Concepts

- absorption costing
- overhead absorption rate (OAR)
- cost-plus pricing
- activity based costing (ABC)
- cost pool
- cost driver
- mark-up
- margin


Absorption and activity based costing - Pricing decisions using both methods