Job Costing: Concepts and Applications

Distinguishing Job Costing from Process Costing

Job costing and process costing are two fundamental methods used to assign costs to products in manufacturing. Understanding their differences is essential for selecting the appropriate costing system for a business.

• Process Costing: Used for mass production of identical units through uniform production steps. Costs are averaged across all units produced.

• Job Costing: Used for unique, custom-ordered products or small batches. Each product or batch is treated as a separate "job." Examples include custom-home builders, high-end jewelers, and accounting firms.

• Key Difference: Job costing tracks costs for individual jobs, while process costing averages costs over many units.

Flow of Production and Tracing Costs

The flow of inventory in a manufacturing system involves tracking materials and labor as they move through production. Direct materials and direct labor are traced to specific jobs, while manufacturing overhead is allocated.

• Production Schedule: Management decides which batches to produce, including custom orders and stock inventory.

• Bill of Materials: Lists all raw materials needed for a job.

• Raw Materials Record: Tracks inventory details for each item.

• Job Cost Record: Tracks all direct materials, direct labor, and allocated overhead for each job.

Tracing Direct Materials and Labor

• Materials Requisition: Used to request materials for a job.

• Labor Time Record: Tracks hours worked and labor costs for each job.

Manufacturing Overhead: Allocation and Calculation

Computing Predetermined Manufacturing Overhead Rate

Manufacturing overhead (MOH) includes indirect costs that must be allocated to jobs. The allocation process involves estimating costs and selecting a cost driver.

• Step 1: Estimate total MOH costs for the coming year.

• Step 2: Select an allocation base (cost driver) and estimate its total usage.

• Step 3: Calculate the predetermined MOH rate:

• Step 4: Allocate MOH to jobs based on the predetermined rate:

Job Cost Records and Business Decisions

Using Job Cost Records

Job cost records provide detailed information for management to make informed decisions.

• Reduce future job costs

• Assess and compare profitability

• Pricing and discount decisions

• Bidding for custom orders

• Preparing financial statements

Sustainability and Job Costing

Job cost records help manufacturers track resources and assess environmental impact, employee involvement, and future disposal considerations.

Non-Manufacturing Costs

• Include R&D, design, marketing, distribution, and customer service

• Assigned to products for internal decision making only

Overallocated and Underallocated Manufacturing Overhead

Definitions and Corrections

At period end, actual MOH may differ from allocated MOH, resulting in underallocation or overallocation.

• Underallocated: Actual MOH > Allocated MOH

• Overallocated: Actual MOH < Allocated MOH

Correcting Cost of Goods Sold:

• If jobs are undercosted, increase Cost of Goods Sold by the underallocated amount.

• If jobs are overcosted, decrease Cost of Goods Sold by the overallocated amount.

Journal Entries in Job Costing

Flow of Costs and Example Entries

Journal entries record the movement of costs through the manufacturing plant, from purchasing raw materials to closing overhead accounts.

• Purchase of raw materials

• Use of direct and indirect materials

• Use of direct and indirect labor

• Incurring other MOH costs

• Allocating MOH to jobs

• Completion and sale of jobs

• Operating expenses

• Closing MOH

Job Costing in Service Firms

Assigning Costs and Billing Clients

Service firms use job costing to bill clients, tracing direct costs and allocating indirect costs.

• Direct Costs: Professional labor traced to client jobs

• Indirect Costs: Operating expenses allocated using a predetermined rate

• Billing: Add profit markup to total job cost

Robotic Process Automation (RPA) in Job Costing

Role and Benefits of RPA

RPA uses software bots to automate repetitive, rule-based tasks in job costing, improving accuracy and efficiency.

• Automates bill of materials creation, inventory updates, labor posting, MOH allocation, and job completion marking

• Reduces errors and frees employees for value-added activities

• Suitable for tasks with high volume, structured data, and costly consequences for errors

Data Analytics: Using Excel Pivot Tables

Analyzing Job Cost and Profitability Data

Excel pivot tables are powerful tools for summarizing and analyzing job cost data, allowing managers to view aggregated information by model, plant, or other attributes.

• Summarizes and cross-tabulates data

• Allows sorting, filtering, and rearranging data

• Quick and simple to produce

Steps to Create a Pivot Table

1. Start with a data set with descriptive column headings

2. Select any cell, click Insert tab, then PivotTable icon

3. Build the table by dragging fields to Rows, Values, and Columns