By-Products & Joint Products: Definitions, Allocation, Profitability

Key Definitions and Differences

1. Joint Products vs. By-Products

classDiagram
    class JointProduct {
        +Produced simultaneously
        +High relative sales value
        +Primary focus of production
        +Example: Crude oil → Petrol, Diesel, Lubricants
    }
    class ByProduct {
        +Produced incidentally
        +Low relative sales value
        +Secondary to main product
        +Example: Wheat bran from flour milling
    }
    JointProduct --> "Produced together" ByProduct : "Same process"

2. How Joint Products Work: A Nepali Tea Factory Example

Scenario: A tea factory in Ilam processes 10,000 kg of green tea leaves into:

• Product A (High-grade tea leaves): 8,000 kg (sold at Rs. 500/kg)
• Product B (Tea dust): 2,000 kg (sold at Rs. 100/kg)

Total Production Cost: Rs. 3,000,000

Step-by-Step Cost Allocation Using Net Realizable Value (NRV) Method

1. Calculate Total Sales Value:

   • Tea leaves: $8,000\times 500=\text{Rs. }4,000,000$
   • Tea dust: $2,000\times 100=\text{Rs. }200,000$
   • Total NRV = Rs. 4,200,000

2. Allocate Joint Costs:

   • Tea leaves allocation: $\frac{4,000,000}{4,200,000}\times 3,000,000=\text{Rs. }2,857,143$
   • Tea dust allocation: $\frac{200,000}{4,200,000}\times 3,000,000=\text{Rs. }142,857$

3. Calculate Profit per Product:

   • Tea leaves profit: $4,000,000-2,857,143=\text{Rs. }1,142,857$
   • Tea dust profit: $200,000-142,857=\text{Rs. }57,143$

3. Cost Allocation Methods Compared

4. By-Products: The "Scrap Value" Approach

Scenario: A flour mill in Kathmandu produces 10,000 kg of wheat flour and generates 500 kg of wheat bran (sold at Rs. 20/kg).

• Total joint cost: Rs. 800,000

Step-by-Step Allocation

1. Deduct By-Product Revenue from Joint Cost:

   • By-product revenue: $500\times 20=\text{Rs. }10,000$
   • Adjusted joint cost for flour: $800,000-10,000=\text{Rs. }790,000$

2. Allocate Remaining Cost to Main Product:

   • Flour cost: Rs. 790,000 (since by-product is negligible).

5. Real-World Applications in Nepal

Example 1: Nepali Paper Industry (Joint Products)

• Products: Newsprint, Cardboard, Waste Paper
• Allocation Method: NRV (since cardboard and waste paper require further processing).
• Why? Cardboard is sold at a lower price than newsprint, but both contribute to revenue.

Example 2: Tea Industry (Joint Products)

• Products: High-grade tea leaves, Tea dust, Tea stems
• Allocation Method: Physical Quantity (if tea dust and stems are sold in bulk) or NRV (if further processed into tea bags).
• Why? Tea dust is often repackaged and sold at a premium, justifying NRV.

Example 3: Wheat Flour Mills (By-Products)

• By-Product: Wheat bran (used as animal feed)
• Treatment: Deduct from joint cost (since bran has minimal value).
• Why? Bran is sold at a very low price (Rs. 20/kg), so it’s treated as scrap.

6. Advantages and Disadvantages of Joint/By-Product Accounting

Advantages

✅ Accurate Profit Measurement: Ensures no product is over/under-costed. ✅ Better Decision-Making: Helps in pricing and resource allocation. ✅ Tax Compliance: Follows accounting standards (e.g., IAS 2 for inventories). ✅ Waste Reduction: Encourages selling by-products (e.g., wheat bran as animal feed).

Disadvantages

❌ Complex Calculations: Requires multiple allocation methods. ❌ Subjectivity: NRV method depends on future sales estimates. ❌ Overhead Costs: Allocating joint costs may not reflect true profitability.

7. Worked Example: Nepali Sugar Mill (Joint Products)

Given:

• Joint Cost: Rs. 5,000,000
• Output:
  • Sugar: 50,000 kg (sold at Rs. 40/kg)
  • Molasses: 10,000 kg (sold at Rs. 10/kg)

Method: Sales Value at Split-off

1. Calculate Total Sales Value:

   • Sugar: $50,000\times 40=\text{Rs. }2,000,000$
   • Molasses: $10,000\times 10=\text{Rs. }100,000$
   • Total = Rs. 2,100,000

2. Allocate Joint Cost:

   • Sugar cost: $\frac{2,000,000}{2,100,000}\times 5,000,000=\text{Rs. }4,761,905$
   • Molasses cost: $\frac{100,000}{2,100,000}\times 5,000,000=\text{Rs. }238,095$

3. Profit Calculation:

   • Sugar profit: $2,000,000-4,761,905=\text{(Loss of Rs. }2,761,905)$ ⚠️ Issue: This suggests sugar is unprofitable, which may not be true if further processing costs are ignored. Solution: Use NRV method instead.

Exam Tip: How to Score Full Marks

1. Define Clearly:

   • Joint product = primary output with high sales value.
   • By-product = secondary output with low sales value.

2. Show All Steps in Allocation:

   • Always write the formula and calculations (e.g., NRV method).
   • Example:

     | Product | Quantity (kg) | Selling Price (Rs/kg) | Total Sales Value (Rs.) |
     |---------|---------------|-----------------------|-------------------------|
     | Tea     | 8,000         | 500                   | 4,000,000               |
     | Dust    | 2,000         | 100                   | 200,000                 |
     | **Total** | **10,000**    |                       | **4,200,000**           |
     

3. Compare Methods:

   • If asked, explain why NRV is better than physical quantity (e.g., "NRV accounts for further processing costs").

4. Real-World Link:

   • Always relate to Nepali industries (tea, paper, sugar, flour).
   • Example answer starter:

     "In the Nepali tea industry, joint cost allocation using NRV ensures that high-value tea leaves are not underpriced while accounting for the revenue from tea dust."

5. Common Mistakes to Avoid:

   • ❌ Ignoring further processing costs (if applicable).
   • ❌ Miscounting quantities (e.g., adding instead of dividing).
   • ❌ Forgetting to deduct by-product revenue from joint costs.

Final Checklist for Exam Questions

Visual Summary:

flowchart TD
    A["Joint Products"] --> B["Allocate Costs Using:<br/>1. Sales Value<br/>2. Physical Quantity<br/>3. NRV<br/>4. Constant GM%"]
    B --> C["Calculate Profit per Product"]
    C --> D["Decision:<br/>- Pricing<br/>- Resource Allocation<br/>- Tax Reporting"]
    E["By-Products"] --> F["Deduct Revenue from Joint Cost"]
    F --> G["Allocate Remaining Cost to Main Product"]