Job & Process Costing: Methods, Systems & Applications

TAKEAWAYS:

• Job costing tracks costs per unique product/service (e.g., custom furniture, Ncell SIM cards), while process costing averages costs across identical units (e.g., Daraz’s bulk T-shirts).
• Overhead allocation (using plant-wide or departmental rates) is critical—misallocation leads to pricing errors (e.g., a Kathmandu shop losing money on a "cheap" order).
• Equivalent units in process costing reconcile partially completed inventory (e.g., NTC’s cable production lines).
• Hybrid systems (e.g., restaurants combining job and process costing) exist when products share similarities but aren’t identical.
• Exam focus: Worked examples with T-accounts, journal entries, and cost reconciliation (beginning + current – ending = transferred costs).
• Real-world tie: Pathao’s ride pricing uses job costing for each trip, while its driver incentives use process costing for bulk fuel purchases.

1. Definitions & Core Concepts

Job Order Costing

Used when products/services are customized or produced in small batches. Costs are traced to specific jobs (e.g., a tailor’s sari, a bank’s loan processing).

Key Features:

• Unique identifiers: Each job has a job card (e.g., "Order #KTM-2024-001" for a Kathmandu wedding dress).
• Direct materials/labor: Easily traced (e.g., fabric for the sari, tailor’s hours).
• Overhead: Allocated using a predetermined rate (e.g., factory rent per labor hour).

Process Costing

Used for mass production of identical units (e.g., Daraz’s phone chargers, NTC’s cables). Costs are averaged across all units.

Key Features:

• No job cards: Costs flow through production departments (e.g., "Cutting," "Assembly").
• Equivalent units: Reconciles partially completed units (e.g., 500 cables 60% complete = 300 equivalent units).
• Weighted average vs. FIFO: Methods to handle beginning inventory.

2. How Job Costing Works: Step-by-Step

Step 1: Assign Direct Costs

• Direct Materials: Purchased and issued to jobs (e.g., 50 meters of silk for Order #KTM-2024-001).
• Direct Labor: Time sheets record hours per job (e.g., 10 hours at ₹500/hour = ₹5,000).

Step 2: Allocate Overhead

Predetermined Overhead Rate (POR): $$\text{POR}=\frac{\text{Estimated Overhead}}{\text{Estimated Activity Base}}=\frac{\text{₹500,000}}{\text{10,000 labor hours}}=₹50/\text{hour}$$ Example: Order #KTM-2024-001 uses 10 labor hours → ₹500 overhead.

Step 3: Complete Job Cost Sheet

Journal Entry:

3. How Process Costing Works: The Production Report

Step 1: Summarize Physical Flow

Assume Department A (Cutting) starts with:

• Beginning WIP: 1,000 units, 40% complete.
• Started: 5,000 units.
• Completed: 4,500 units.
• Ending WIP: 1,500 units, 30% complete.

Equivalent Units (EU): $$\text{EU}=\text{Completed}+(\text{Ending WIP}\times \text{Percentage})$$ $$\text{EU}=4,500+(1,500\times 0.30)=4,950\text{ units}$$

Step 2: Calculate Cost per EU

Cost Assignment:

• Completed Units: 4,500 × ₹30.30 = ₹136,350
• Ending WIP (30%): 1,500 × (₹30.30 × 0.30) = ₹13,635

4. Job vs. Process Costing: Comparison Table

5. Real-World Applications

Example 1: Pathao’s Ride Pricing (Job Costing)

• How it works: Each ride is a "job" with:
  • Direct costs: Driver’s time (₹200/hour), fuel (₹15/liter), vehicle depreciation.
  • Overhead: App maintenance, customer support (allocated per ride).
• Calculation: $$\text{Ride Cost}=(\text{Distance}\times ₹10/\text{km})+(\text{Time}\times ₹2/\text{min})+\text{Fixed Overhead (₹5/ride)}$$
• Why? Ensures profitability per trip while keeping prices competitive.

Example 2: Daraz’s Bulk Orders (Process Costing)

• How it works: Selling 10,000 identical phone cases.
  • Total cost: ₹500,000 (fabric, labor, packaging).
  • Cost per unit: ₹50 (₹500,000 ÷ 10,000).
• Equivalent Units: If 2,000 units are 50% complete at month-end: $$\text{EU}=8,000\text{ (completed)}+(2,000\times 0.50)=9,000\text{ units}$$ $$\text{Cost per EU}=\frac{₹500,000}{9,000}=₹55.56$$
• Pricing: Sell at ₹70/unit to cover costs + profit.

Example 3: NTC’s Cable Production (Hybrid System)

• Job Costing: Custom cable orders (e.g., for a corporate client) use job cards.
• Process Costing: Standard cables (e.g., 10,000 meters of 2.5mm² wire) use process costing.
• Overhead: Allocated based on machine hours (e.g., ₹20/hour for extruding).

6. Worked Example: Kathmandu Retail Shop

Scenario: Shree Ganesh Store makes custom wooden furniture. In May 2024:

• Direct Materials Purchased: ₹250,000 (wood, varnish).
• Direct Labor: ₹180,000 (carpenters, painters).
• Overhead: Rent ₹50,000, utilities ₹20,000, depreciation ₹30,000.
• Activity Base: 6,000 labor hours.
• Jobs Completed:
  • Job #KTM-001: 5 dining tables (20 labor hours each).
  • Job #KTM-002: 10 chairs (5 labor hours each).

Step 1: Calculate Predetermined Overhead Rate (POR)

$$\text{POR}=\frac{₹50,000+₹20,000+₹30,000}{6,000\text{ hours}}=₹16.67/\text{hour}$$

Step 2: Assign Costs to Jobs

Step 3: Journal Entries

Step 4: T-Accounts

7. Process Costing Example: NTC’s Cable Factory

Department: Extrusion

• Beginning WIP: 5,000 meters, 60% complete, costing ₹15,000.
• Started: 20,000 meters.
• Completed: 18,000 meters.
• Ending WIP: 7,000 meters, 40% complete.
• Current Period Costs: ₹60,000.

Step 1: Calculate Equivalent Units (EU)

$$\text{EU}=18,000\text{ (completed)}+(7,000\times 0.40)=20,800\text{ meters}$$

Step 2: Cost per EU

$$\text{Total Cost}=₹15,000\text{ (beginning)}+₹60,000=₹75,000$$ $$\text{Cost per EU}=\frac{₹75,000}{20,800}=₹3.60/\text{meter}$$

Step 3: Assign Costs

• Completed Units: 18,000 × ₹3.60 = ₹64,800
• Ending WIP: 7,000 × (₹3.60 × 0.40) = ₹10,080

Production Report:

8. Advantages & Disadvantages

9. Hybrid Costing Systems

Some businesses use both methods:

• Example: A restaurant
  • Job Costing: Custom birthday cakes (tracked per order).
  • Process Costing: Daily bulk meals (cost averaged per plate).

10. Exam Tip

What Examiners Want to See:

1. Clear distinction between job and process costing (use the comparison table).
2. Step-by-step calculations with T-accounts and production reports.
3. Real-world ties: Always relate to Nepali businesses (e.g., "How would Ncell apply job costing to VIP customer SIMs?").
4. Common pitfalls:
   • Forgetting to reconcile beginning + current – ending = transferred costs.
   • Misallocating overhead (e.g., using labor hours when machine hours are better).
5. Diagrams: Draw the accounting cycle (see below) and T-accounts for full marks.

flowchart TD
    A["Start\n(Purchase Materials)"] --> B["Record Direct Materials\nto WIP"]
    B --> C["Record Direct Labor\nto WIP"]
    C --> D["Allocate Overhead\nto WIP"]
    D --> E["Complete Jobs\nTransfer to Finished Goods"]
    E --> F["Sell Goods\nRecord Revenue & COGS"]
    F --> G["End\n(Closing Entries)"]

Key Formulas to Memorize:

• Predetermined Overhead Rate (POR): $\frac{\text{Estimated Overhead}}{\text{Estimated Activity Base}}$
• Equivalent Units (EU): $\text{Completed}+(\text{Ending WIP}\times \text{Percentage})$
• Cost per EU: $\frac{\text{Total Cost}}{\text{Total EU}}$

Final Note: Practice mixed problems (e.g., a shop using both job and process costing) to ace the exam. Always show your work—partial credit is given for correct steps!