Job, process, and hybrid costing

Learning goals

• Select job, process, or hybrid costing from production facts.
• Apply predetermined overhead and trace cost through inventory accounts.
• Calculate equivalent units in a simplified process department.

Prerequisite check

Direct materials and direct labour are traced when economically feasible; overhead is allocated using a causal or benefit-based driver. Product cost flows from raw materials to work in process, finished goods, and cost of goods sold.

Vocabulary

• Job costing: accumulates costs for distinct customer jobs or batches.
• Process costing: averages costs over homogeneous units in continuous processes.
• Hybrid costing: combines process features with job/batch distinctions.
• Predetermined overhead rate (POHR): budgeted overhead divided by budgeted allocation base.
• Equivalent unit: amount of work expressed as completed whole units.

Core idea

The costing system should mirror how resources are consumed. A custom renovation needs job records; a chemical stream needs process averaging; a beverage line with common processing and flavour-specific batches may need both. The result supports inventory measurement and decisions only if the driver and production data are reliable.

Why this treatment makes sense

Waiting for actual annual overhead would delay job information and create unstable unit costs. Predetermined rates provide timely estimates, while year-end analysis of under- or overapplied overhead corrects the difference and improves future drivers.

A repeatable method

1. Map production flow and identify the cost object.
2. Trace direct materials and labour from source records.
3. Choose a budgeted overhead pool and causal allocation base.
4. Calculate POHR and apply it to actual activity.
5. For processes, reconcile physical units and compute equivalent units by component.
6. Assign costs to completed work and ending WIP.
7. Reconcile control accounts and investigate applied-versus-actual overhead.

Worked example

Kingston Exhibit Works budgets $720,000 manufacturing overhead and 24,000 machine hours. POHR = $30 per machine hour. Job 418 uses direct materials $18,000, direct labour $12,500, and 420 machine hours. Applied overhead = 420 × $30 = $12,600; total job cost = $43,100. For 100 display units, cost per unit = $431.

Entries: materials requisition debits WIP $18,000; labour debits WIP $12,500; applied overhead debits WIP and credits Manufacturing Overhead $12,600. Completion debits Finished Goods and credits WIP $43,100.

In a separate finishing process, 1,000 physical units are 60% complete for conversion; they represent 600 conversion equivalent units, showing why physical units alone are not enough for process costing.

Journal, ledger, and statement connection

Job sheets or department reports are subsidiary records for WIP. Materials tickets, time records, and machine data support debits; cost transfers move balances without creating new total cost. Unsold cost appears in inventory; sold cost enters COGS.

Common mistakes

• Using actual overhead divided by actual activity as though it were a predetermined rate.
• Applying overhead to budgeted rather than actual job activity.
• Treating beginning/ending WIP physical units as fully complete.
• Choosing a cost system based on industry name instead of production facts.

Guided practice

Budgeted overhead $450,000 and 30,000 labour hours give $15/hour. A job with $9,000 materials, $6,000 labour, and 300 labour hours costs $9,000 + $6,000 + $4,500 = $19,500.

Independent practice

Level 1 — choose: Identify the likely system for custom legal files, litres of paint, and standard bikes with customer-specific accessories.

Level 2 — job cost: POHR $24/machine hour; materials $15,000; labour $8,400; 350 machine hours; 60 units. Find total and unit cost.

Level 3 — process: Ending WIP has 2,000 units, materials 100% complete and conversion 35%. Find equivalent units for each component.

Self-check and solutions

Level 1: Job; process; hybrid, subject to the actual production design.

Level 2: Overhead $8,400; total $31,800; $530 per unit.

Level 3: Materials 2,000 equivalent units; conversion 700. Separate completion percentages are essential.

Retrieval practice

1. State the POHR formula.
2. What record supports WIP in job costing?
3. Why use equivalent units?

Answers: budgeted overhead/budgeted base; job cost sheet; to express incomplete work as completed-unit equivalents.

Exam-style application

Choose a system for a mixed production case, calculate and post one job, compute ending process equivalent units, and recommend one data control for labour or machine hours.

Lesson summary

Costing systems follow production economics, trace feasible direct costs, allocate overhead consistently, and reconcile operational records to inventory ledgers.