## Further Process or Not — Decision Rule

After the split-off point, management must decide whether to sell a joint product immediately or process it further. The decision rests on a simple incremental comparison.

### The Comparison Framework

Compare:

Extra Revenue earned after processing	vs	Extra Expenses incurred in processing
(Incremental Revenue)		(Incremental Cost)

### Decision Rules

1. If Incremental Revenue > Incremental Cost → Process further (it adds value)

2. If Incremental Revenue < Incremental Cost → Do NOT process further (sell at split-off)

3. If Incremental Revenue = Incremental Cost → Indifferent (either choice is acceptable)

### Key Principle

Joint costs incurred before the split-off point are irrelevant to this decision because they are sunk costs — they have been incurred regardless of the choice made after split-off. Only the incremental revenue and incremental cost after split-off matter.

### Incremental Revenue Formula

```

Incremental Revenue = Selling Price after further processing − Selling Price at split-off point

```

### Incremental Cost

Incremental cost includes all additional material, labour, and overhead costs incurred from split-off point until the product is ready for final sale.

Worked example

### Example 1

Example: Product X can be sold at split-off for ₹100/unit or processed further at a cost of ₹30/unit and sold for ₹140/unit.

Incremental Revenue = ₹140 − ₹100 = ₹40
Incremental Cost = ₹30
Since ₹40 > ₹30 → Process further (Net gain = ₹10/unit)

### Example 2

Example: Product Y sells at split-off for ₹50/unit. Further processing costs ₹25/unit and increases selling price to ₹70/unit.

Incremental Revenue = ₹70 − ₹50 = ₹20
Incremental Cost = ₹25
Since ₹20 < ₹25 → Do not process further (Net loss of ₹5/unit if processed)

⚠️ Common exam mistakes

Including joint costs (pre-split-off costs) in the comparison — these are sunk and irrelevant.
Comparing total revenue with total cost instead of incremental revenue with incremental cost.
Forgetting to subtract the split-off selling price from the final selling price when calculating incremental revenue.
Ignoring opportunity cost — if further processing uses capacity that could earn elsewhere, that should also be considered.
Assuming further processing is always profitable because the final selling price is higher.

Reference:

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Further Process or Sell at Split-Off Decision

Worked example

⚠️ Common exam mistakes