Cost determination refers to the systematic process of calculating the total cost of production and the cost per unit of output in a manufacturing process. When goods are produced through continuous or repetitive operations, especially in industries like chemicals, textiles, paper, cement, oil refining, and food processing, the process costing method is used. The procedure for ascertaining process cost ensures accurate cost measurement at each stage of production.
Meaning of Process Cost Determination
Process cost determination is the method of collecting, recording, classifying, and allocating costs incurred in each stage (process) of production. Since production passes through multiple processes, each process is treated as a separate cost centre. The cost of each process is calculated independently and then transferred to the next process until the finished product is obtained.
The main objective is to find:
- Total cost of each process
- Cost per unit of output in each process
- Total cost of finished goods
Procedure for Ascertaining Process Cost
The procedure of cost determination in process costing involves several well-defined steps. These steps ensure accurate calculation and proper cost control.
1. Identification of Processes
The first step is to identify all the processes involved in production. Each stage of production is treated as a separate cost centre.
For example, in a textile mill:
- Spinning
- Weaving
- Dyeing
- Finishing
Each of these is considered a separate process.
This step is important because all costs will be collected and analyzed process-wise.
2. Collection of Cost Data
After identifying processes, the next step is to collect all relevant cost data for each process. Costs are classified into:
(a) Direct Materials
Raw materials directly used in a particular process.
(b) Direct Labour
Wages of workers directly engaged in the process.
(c) Direct Expenses
Other direct costs like power, fuel, and machine hire charges.
(d) Indirect Costs (Overheads)
Indirect expenses such as factory rent, depreciation, supervision, and maintenance.
All these costs are recorded in a Process Cost Sheet.
3. Preparation of Process Accounts
A separate Process Account is prepared for each process. It is a ledger account that records all costs incurred and units processed.
Each Process Account has two sides:
- Debit side: Costs incurred
- Credit side: Units transferred to next process or finished goods
Format:
- Opening Work-in-Progress (if any)
- Input materials
- Labour cost
- Overheads
- Normal loss adjustment (if any)
This helps in determining the total cost of each process.
4. Treatment of Input Materials
Materials may be introduced in different ways:
(a) At the Beginning of Process
Raw materials are added at the start, and total cost is assigned to all units.
(b) At Different Stages
Some materials may be added midway, and cost is adjusted accordingly.
Proper recording of material input ensures accurate cost calculation per unit.
5. Treatment of Output and Transfer of Costs
Once a process is completed, its output is transferred to the next process at cost. The transferred cost becomes the input cost of the next process.
For example:
- Output of Process A → Input of Process B
- Output of Process B → Input of Process C
This continues until the final product is obtained.
6. Treatment of Normal Loss
In most production processes, some loss of material is unavoidable. This is called normal loss.
Normal loss is:
- Expected and unavoidable
- Not separately costed to units produced
- Usually absorbed by good units
Formula:
Normal Loss = Input Units × Normal Loss Percentage
The cost of normal loss is borne by good units, increasing their cost per unit.
7. Treatment of Abnormal Loss
If loss occurs beyond the expected level, it is called abnormal loss.
Characteristics:
- Not part of normal production
- Due to inefficiency, accidents, or machine breakdown
- Treated separately in costing
Abnormal loss is:
- Debited to Abnormal Loss Account
- Valued at cost per unit
- Credited when scrap value is realized
This ensures that abnormal inefficiencies are not charged to production cost.
8. Treatment of Abnormal Gain
If actual loss is less than normal loss, the difference is called abnormal gain.
This occurs when production efficiency is higher than expected.
Abnormal gain is:
- Recorded in Abnormal Gain Account
- Valued at cost per unit
- Ultimately credited to Costing Profit and Loss Account
9. Calculation of Equivalent Units (for Work-in-Progress)
At the end of a period, there may be incomplete units known as work-in-progress (WIP).
To determine cost accurately, incomplete units are converted into equivalent units.
Equivalent units = Partially completed units × percentage of completion
This step ensures fair allocation of costs between completed and incomplete units.
10. Determination of Total Cost
After collecting all costs and making necessary adjustments for losses and WIP, total process cost is calculated as:
Total Cost = Direct Materials + Direct Labour + Direct Expenses + Overheads ± Adjustments
This total cost is recorded in the Process Account.
11. Calculation of Cost per Unit
The final step is to calculate cost per unit of output in each process.
Formula:
Cost per unit = Total process cost ÷ Number of units produced
If equivalent units are used, then:
Cost per equivalent unit = Total cost ÷ Equivalent production units
This helps in pricing decisions and cost control.
12. Transfer to Next Process or Finished Stock
The cost of output from one process is transferred to the next process or finished goods account. This continues until the final stage of production is reached.
At the final stage:
- Total cost of finished goods is determined
- Cost per unit is calculated for sales and valuation
Importance of Cost Determination in Process Costing
- Helps in determining accurate product cost
- Aids in pricing decisions
- Helps in cost control and reduction
- Identifies inefficiencies and wastage
- Useful for managerial decision-making
- Facilitates inventory valuation
Conclusion
The procedure for ascertaining process cost is a systematic method of collecting and allocating costs at each stage of production. It involves identifying processes, recording costs, preparing process accounts, handling normal and abnormal losses, calculating equivalent units, and finally determining cost per unit. This method ensures accurate cost measurement, better control over production expenses, and efficient management of large-scale continuous manufacturing industries.
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