In cost accounting, overheads refer to indirect costs that cannot be directly traced to a specific product, job, or service. These include expenses such as factory rent, indirect labor, depreciation of machinery, power, and maintenance costs. Since these costs are essential for production but cannot be directly assigned, they must be distributed among different cost units. This process is known as absorption of overheads.
Overhead absorption is the method of assigning or charging overhead costs to products, jobs, or processes on a systematic and rational basis. The main objective is to ensure that each product or job bears a fair share of indirect costs so that total cost and profitability can be correctly determined.
Meaning and Importance of Overhead Absorption
Overhead absorption refers to the process of recovering overhead costs from cost units by using predetermined rates. It ensures that indirect costs are included in the total cost of production along with direct materials and direct labor.
The importance of overhead absorption lies in the following aspects:
- It helps in determining accurate product cost.
- It ensures fair pricing of products and services.
- It aids in cost control and managerial decision-making.
- It provides a basis for budgeting and performance evaluation.
- It helps in comparing profitability among different jobs or products.
Without proper absorption of overheads, cost statements would be incomplete and misleading, leading to incorrect pricing and poor financial decisions.
Steps in Overhead Absorption
The process of absorbing overhead into products or jobs generally involves the following steps:
1. Collection and Classification of Overheads
The first step is to collect all overhead costs and classify them into appropriate categories such as production overhead, administrative overhead, and selling and distribution overhead.
2. Allocation and Apportionment
Overheads are then either allocated directly to cost centers or apportioned on a suitable basis among different departments. Allocation is done when a cost can be directly assigned, while apportionment is used when costs are shared.
3. Reapportionment (Secondary Distribution)
Service department costs are redistributed to production departments since only production departments are involved in manufacturing goods.
4. Determination of Absorption Base
A suitable basis is selected for absorbing overheads. Common bases include direct labor hours, machine hours, direct labor cost, or units produced.
5. Computation of Overhead Absorption Rate
A predetermined overhead rate is calculated to charge overheads to products or jobs.
6. Absorption into Cost Units
Finally, overheads are applied to jobs or products based on the chosen rate and actual activity level.
Methods of Overhead Absorption
Different methods are used for absorbing overheads depending on the nature of production and industry practices.
1. Direct Material Cost Percentage Method
In this method, overheads are absorbed as a percentage of direct material cost. It is simple but less accurate because material cost may not reflect overhead consumption.
2. Direct Labor Cost Percentage Method
Here, overheads are absorbed as a percentage of direct labor cost. This method assumes a direct relationship between labor cost and overheads.
3. Direct Labor Hour Rate Method
Overheads are charged based on labor hours worked. This method is more accurate when labor is a key factor in production.
4. Machine Hour Rate Method
This method is used in industries where machinery plays a major role. Overheads are charged based on machine running hours.
5. Prime Cost Percentage Method
Overheads are absorbed as a percentage of prime cost (direct materials + direct labor). It provides a broader cost base.
6. Blanket Overhead Rate
A single overhead rate is used for the entire factory. It is suitable for small firms but may lead to inaccurate cost allocation in large organizations.
7. Departmental Overhead Rate Method
Each department has its own overhead rate based on its cost structure. This method improves accuracy and is widely used in large industries.
Overhead Absorption in Job and Process Costing
Job Costing
In job costing, overheads are absorbed for each specific job. Each job is treated as a separate cost unit, and overheads are applied based on estimated rates such as labor hours or machine hours. For example, in a printing press or construction company, overheads are allocated to each individual job order.
Process Costing
In process costing, overheads are absorbed by each production process or department. The total overheads are divided among units produced in a process over a period of time. This is common in industries like chemicals, textiles, and food processing.
Predetermined Overhead Rate
Since actual overheads cannot be known in advance, companies use a predetermined overhead rate (POHR) to apply overheads during production. It is calculated as:
POHR = Estimated Overhead Cost / Estimated Activity Base
This rate is applied to actual production activity to absorb overheads into cost units. At the end of the period, differences between actual and absorbed overheads are adjusted.
Over-Absorption and Under-Absorption of Overheads
Over-Absorption
Over-absorption occurs when the amount of overhead absorbed is greater than the actual overhead incurred. This leads to an overstatement of profit.
Under-Absorption
Under-absorption occurs when the absorbed overhead is less than the actual overhead incurred. This results in understating the cost and overstatement of profit.
Causes
- Incorrect estimation of overheads
- Inefficient production planning
- Seasonal fluctuations in production
- Use of inappropriate absorption rates
Treatment
Over- or under-absorbed overheads are adjusted in cost accounts by transferring them to the costing profit and loss account or carrying forward to the next period.
Advantages of Overhead Absorption
- Accurate Product Costing: It ensures that all costs are included in product pricing.
- Better Pricing Decisions: Helps management set competitive and profitable prices.
- Cost Control: Identifies overhead-heavy areas for improvement.
- Fair Cost Distribution: Ensures each product bears its fair share of overhead.
- Performance Evaluation: Helps compare departmental efficiency.
Limitations of Overhead Absorption
Despite its usefulness, overhead absorption has certain limitations:
- Estimation Errors: Predetermined rates may not reflect actual costs accurately.
- Arbitrary Bases: Selection of absorption base may be subjective.
- Complexity in Large Firms: Multiple departments make calculations complicated.
- Time Lag Issues: Actual overheads differ from absorbed overheads, requiring adjustments.
- Less Precision in Modern Industries: Traditional methods may not suit advanced automated systems.
Conclusion
The absorption of overheads is a vital aspect of cost accounting that ensures indirect costs are properly assigned to products, jobs, or processes. By using systematic methods such as labor hour rates, machine hour rates, and departmental overhead rates, businesses can achieve accurate product costing and better financial control. Although it involves certain limitations due to estimation and allocation challenges, overhead absorption remains essential for pricing decisions, cost control, and profitability analysis. In modern competitive industries, improving the accuracy of overhead absorption methods is crucial for effective managerial decision-making and long-term sustainability.
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