by In Process Costing, Output at each stage rarely equals the input quantity fed into the process, since manufacturing involves evaporation, spillage, chemical reaction, or scrap generation. When actual output falls below the expected or normal output, the shortfall is termed a process loss, which may be normal (inherent, unavoidable, anticipated in advance) or abnormal (arising from inefficiency, accidents, or unusual conditions). Conversely, when actual output exceeds normal expectations, the surplus is called abnormal gain. Correctly identifying and accounting for these losses and gains is essential, as they directly affect the cost per unit charged to good production and the valuation of closing work-in-progress.
1. Normal Process Loss
Normal process loss is the unavoidable loss that occurs during normal production due to evaporation, shrinkage, wastage, or other technical reasons. It is expected under normal operating conditions and is therefore treated as a part of the cost of good production. The normal loss quantity is credited to the Process Account at its scrap value, if any. The value of normal loss is deducted from the total process cost before calculating the cost per good unit. Thus, normal loss does not normally create a separate loss to be transferred to the Profit and Loss Account.
Accounting Entry:
| Particulars | Treatment |
|---|---|
| Normal Loss | Credited to Process A/c |
| Scrap Value | Credited to Process A/c |
| Cost Effect | Absorbed by Good Output |
| Formula | Cost per unit = (Process Cost − Scrap Value) ÷ Expected Output |
2. Abnormal Process Loss
Abnormal process loss occurs when the actual loss exceeds the normal expected loss. It may arise due to inefficient production, accidents, defective materials, machine breakdown, or other unusual circumstances. The quantity of abnormal loss is transferred to the Abnormal Loss Account and is valued at the cost per unit of good production. The amount is subsequently transferred to the Profit and Loss Account, unless it is recovered through insurance or another source. This treatment ensures that abnormal losses do not unnecessarily increase the cost of normal production.
Accounting Entry:
| Particulars | Treatment |
|---|---|
| Abnormal Loss | Transferred to Abnormal Loss A/c |
| Abnormal Loss A/c | Debited |
| Process A/c | Credited |
| Final Treatment | Transferred to Profit and Loss A/c |
| Formula | Abnormal Loss = Actual Loss − Normal Loss |
3. Abnormal Process Gain
Abnormal process gain arises when the actual loss is less than the normal expected loss. In such a situation, the actual output is higher than the expected output. The excess output is treated as abnormal gain and transferred to the Abnormal Gain Account. The gain is valued at the applicable process cost per unit. The Abnormal Gain Account is then transferred to the Profit and Loss Account. This treatment separately identifies the benefit arising from better than expected production performance.
Accounting Entry:
| Particulars | Treatment |
|---|---|
| Abnormal Gain | Transferred to Abnormal Gain A/c |
| Process A/c | Debited |
| Abnormal Gain A/c | Credited |
| Final Treatment | Transferred to Profit and Loss A/c |
| Formula | Abnormal Gain = Normal Loss − Actual Loss |
4. Normal Loss with Scrap Value
Normal loss may have a scrap value that can be recovered by selling the waste material. The scrap value is credited to the Process Account because it represents an amount recovered from the normal loss. The remaining process cost is then distributed over the expected good output. This reduces the effective cost of production. For example, if normal loss is 100 units and each unit has a scrap value of ₹2, the Process Account is credited by ₹200. Therefore, scrap value of normal loss is considered while determining the cost per unit of good output.
Formula:
Cost per Good Unit = (Total Process Cost − Scrap Value of Normal Loss) ÷ Expected Good Output
