A to Z Costing Knowledge Glossary — Letter J
Investopedia-style costing concepts explained with formulas, practical examples, comparisons, and exam-focused teaching tips.
1 Job Costing
| Category | Costing Method |
|---|---|
| Best Used In | Unique, custom products or services |
| Key Formula | Job Cost = Direct Material + Direct Labour + Overhead Applied |
| Exam Importance | Very High |
Job Costing is a costing method used to determine the cost of a specific job, order, or batch of products where each job is distinct and can be identified separately.
It involves accumulating costs for each job, customer, or contract separately, often using a job cost sheet, and is applied in industries like printing, construction, shipbuilding, and custom manufacturing.
- Printing press (each order unique)
- Construction projects
- Custom machinery manufacturing
- Professional services (consulting, audit)
A printing company receives an order for 500 custom brochures. It collects direct material (paper, ink), direct labour (designer, printer), and applies overhead (machine depreciation, rent) using a predetermined rate, arriving at total job cost and unit cost.
Job #101: Direct material ₹20,000, direct labour ₹15,000, overhead applied ₹10,000 (at ₹50 per labour hour; 200 hours). Total job cost = ₹45,000. For 500 units, cost per unit = ₹90.
Cost per Unit = Total Job Cost / Number of Units in Job
- Identify the specific job or customer order.
- Trace direct materials and labour to the job using requisitions and time tickets.
- Allocate/apportion overheads to the job using a predetermined absorption rate.
- Sum all costs to get total job cost.
- Divide by quantity to get cost per unit; use for pricing and profitability analysis.
| Job Costing vs. Process Costing | Job costing for unique, separate jobs; process costing for continuous, homogeneous production. |
|---|---|
| Job Costing vs. Batch Costing | Batch costing is a variation of job costing for groups of identical units. |
2 Job Cost Sheet
| Category | Costing Record |
|---|---|
| Best Used In | Tracking costs for a specific job |
| Key Formula | Columnar record of all costs for a job |
| Exam Importance | High |
A Job Cost Sheet is a document used to accumulate and record all direct materials, direct labour, and applied overhead for a specific job or order.
It serves as a subsidiary ledger for the work-in-process account, providing detailed cost information for each job in process.
- Tracking costs by job number
- Determining total and unit cost for each job
- Billing customers on cost-plus contracts
When a job is started, a job cost sheet is opened. Material requisitions are charged to it, labour time tickets are posted, and overhead is applied using a rate. When complete, the total cost is summarized and transferred to finished goods.
Job #205: Direct materials ₹30,000, direct labour ₹20,000, manufacturing overhead applied ₹10,000. Total cost on job cost sheet = ₹60,000. The sheet shows detailed line items and dates of entry.
- Create a job cost sheet with job number and description.
- Record material costs from material requisition forms.
- Record labour costs from time tickets.
- Apply overhead using predetermined rate.
- Summarize total cost and compute unit cost if applicable.
| Job Cost Sheet vs. Cost Sheet | Cost sheet is for a period or product; job cost sheet is for a specific job. |
|---|---|
| Job Cost Sheet vs. Process Cost Report | Process cost report accumulates costs per process/department; job cost sheet per job. |
3 Job Card
| Category | Labour Time Record |
|---|---|
| Best Used In | Recording time spent by workers on specific jobs |
| Key Formula | No formula; record of job number, time, worker |
| Exam Importance | Medium |
A Job Card is a document used to record the time spent by a worker on a particular job, enabling accurate allocation of labour costs to that job.
It is a timekeeping record that identifies the worker, the job, and the hours worked, often used in conjunction with a clock card (attendance) to separate time by job.
- Job costing and batch costing
- Labour efficiency analysis
- Payroll and labour cost allocation
A worker moves between jobs during the day. For each job, a job card is filled with start and end times. At the end of the day, total hours are reconciled with the clock card to ensure accuracy.
Worker Ramesh worked 4 hours on Job A and 3 hours on Job B. Job cards for each show these times. Labour cost is allocated accordingly: Job A charged 4 hours, Job B charged 3 hours.
- Issue a job card for each job/operation.
- Worker records start and finish time for that job.
- Supervisor signs off on accuracy.
- Total hours per job are summarized.
- Use hours to allocate labour cost to jobs.
| Job Card vs. Clock Card | Clock card records total attendance; job card records time per job. |
|---|---|
| Job Card vs. Time Sheet | Time sheet may combine multiple jobs for a worker; job card is usually per job. |
4 Job Evaluation
| Category | Labour Costing / HR |
|---|---|
| Best Used In | Setting wage differentials, job grading |
| Key Formula | Job value determined by factors (skill, effort, responsibility) |
| Exam Importance | Low |
Job Evaluation is a systematic process of determining the relative worth of different jobs within an organization to establish fair wage structures and differentials.
It assesses job content (skills, responsibilities, effort, working conditions) rather than the job holder, providing a basis for equitable compensation.
- Designing salary structures
- Ensuring internal pay equity
- Industrial relations and collective bargaining
A company evaluates jobs using point factor method: machine operator scores higher than assembler due to skill requirement. This justifies higher wages for machine operators.
Job A (Accountant) scored 600 points, Job B (Clerk) 400 points. Salary bands are set based on point ranges, ensuring higher pay for higher-scored jobs.
- Select method (ranking, classification, point factor).
- Identify compensable factors (skill, effort, responsibility, conditions).
- Assign weights/points to factors.
- Evaluate each job against factors.
- Rank jobs and establish wage differentials.
| Job Evaluation vs. Performance Appraisal | Job evaluation evaluates the job, not the person; performance appraisal evaluates the individual’s performance. |
|---|---|
| Job Evaluation vs. Market Pricing | Market pricing sets wages by external market; job evaluation sets by internal equity. |
5 Joint Cost
| Category | Joint Product Costing |
|---|---|
| Best Used In | Cost allocation before split-off point |
| Key Formula | Joint cost = cost incurred up to split-off point |
| Exam Importance | High |
Joint Cost is the cost incurred in a single production process that yields multiple products simultaneously up to the split-off point, where products become separately identifiable.
Before the split-off point, costs cannot be traced to individual products; they are common to all joint products and must be allocated using a suitable basis.
- Oil refining (petrol, diesel, kerosene)
- Meat processing (various cuts)
- Dairy (cream, butter, skim milk)
A dairy processes raw milk into cream and skim milk. The cost of pasteurizing and separating is a joint cost; it is allocated to cream and skim milk based on their relative sales values or physical units.
Joint cost of processing raw milk up to split-off = ₹1,00,000. Output: cream 1,000 kg, skim milk 4,000 kg. If allocated by physical units (total 5,000 kg), cream gets ₹20,000, skim milk ₹80,000.
- Identify the split-off point in the production process.
- Accumulate all costs incurred up to that point.
- Choose an allocation basis (physical units, sales value, NRV).
- Allocate joint cost to each product accordingly.
- Use for inventory valuation and profitability analysis.
| Joint Cost vs. Common Cost | Common cost is broader, any shared cost; joint cost is specific to joint production. |
|---|---|
| Joint Cost vs. By-Product Cost | By-product cost is usually not allocated separately; by-product sales reduce joint cost. |
6 Joint Product
| Category | Joint Product Costing |
|---|---|
| Best Used In | Products from same process with significant value |
| Key Formula | Joint products have relatively equal importance and value |
| Exam Importance | Medium |
Joint Products are two or more products of significant value that are produced simultaneously from the same raw material or process up to the split-off point.
Unlike by-products, joint products have substantial sales value and are considered equally important, requiring allocation of joint costs.
- Petrol, diesel, and kerosene from crude oil
- Different grades of lumber from a log
- Various chemical products from a common process
An oil refinery produces petrol, diesel, and LPG. All are joint products with significant value; joint costs are allocated to each for inventory and pricing.
From 100 barrels of crude, output: petrol 60 barrels (sales value ₹3,000), diesel 30 barrels (₹2,000), LPG 10 barrels (₹1,000). All are joint products because each has significant sales value.
- Identify all outputs from the process.
- Assess their sales value and significance.
- Classify as joint products if all significant.
- Allocate joint costs accordingly.
- Use for profitability analysis.
| Joint Product vs. By-Product | By-product has minor value compared to joint product. |
|---|---|
| Joint Product vs. Main Product | Main product is the primary output; joint products are co-products of equal importance. |
7 Joint Product Costing
| Category | Costing Methodology |
|---|---|
| Best Used In | Allocating costs to joint products |
| Key Formula | Allocation methods: physical units, sales value, NRV |
| Exam Importance | Medium |
Joint Product Costing is the process of allocating joint costs to joint products using a systematic and equitable basis, such as physical quantity, sales value at split-off, or net realizable value.
Since joint costs are common, this costing method determines each product’s share of the total cost for inventory valuation, pricing, and financial reporting.
- Inventory valuation of joint products
- Cost of goods sold calculation
- Product profitability analysis
In oil refining, joint product costing allocates the cost of crude oil and processing to petrol, diesel, and LPG using their sales value at split-off, enabling accurate margin analysis for each fuel.
Joint cost ₹1,20,000. Products: A (400 units, sales value ₹80,000), B (600 units, sales value ₹40,000). Allocation by sales value: A gets 80,000/(80,000+40,000) × 1,20,000 = ₹80,000; B gets ₹40,000.
Allocation to Product = Joint Cost × (Sales Value of Product / Total Sales Value of All Joint Products)
- Determine total joint cost up to split-off.
- Measure sales value (or physical units, NRV) of each product at split-off.
- Compute total sales value (or total units).
- Calculate allocation ratio and multiply by joint cost.
- Allocate to each product for costing.
| Joint Product Costing vs. Process Costing | Process costing is for single product; joint product costing allocates costs to multiple products from same process. |
|---|---|
| Joint Product Costing vs. By-Product Accounting | By-product accounting credits sales to joint cost; joint product costing allocates cost to each. |
8 Joint Cost Allocation
| Category | Cost Allocation Method |
|---|---|
| Best Used In | Distributing joint costs to products |
| Key Formula | Various: Physical units, Sales value, NRV |
| Exam Importance | Medium |
Joint Cost Allocation is the process of assigning joint costs to joint products using a logical basis, so each product bears a proportionate share of the common costs.
It addresses the challenge of attributing common costs to multiple outputs, using methods like physical units, sales value at split-off, estimated net realizable value, or constant gross margin percentage.
- Financial reporting for joint products
- Inventory valuation
- Product profitability decisions
A meat processing company allocates joint cost to different cuts (steak, ribs, ground beef) based on their relative selling prices at split-off, ensuring each product’s cost reflects its market value.
Joint cost ₹50,000. Products X (1,000 kg, sales value ₹40,000), Y (500 kg, sales value ₹10,000). Allocation by sales value: X = 50,000 × 40,000/50,000 = ₹40,000; Y = ₹10,000.
- Choose a suitable allocation basis (sales value at split-off, physical units, NRV).
- Measure the basis for each product.
- Sum the bases across products.
- Compute allocation ratio for each.
- Multiply ratio by total joint cost to allocate.
| Joint Cost Allocation vs. Overhead Allocation | Overhead allocation uses cost drivers; joint cost allocation uses sales value or physical measures. |
|---|---|
| Joint Cost Allocation Methods | Physical units, sales value at split-off, NRV, constant gross margin. Each has different accuracy and purpose. |
9 Just-in-Time (JIT)
| Category | Inventory / Production Management |
|---|---|
| Best Used In | Minimizing inventory, improving efficiency |
| Key Formula | Inventory levels minimized to meet immediate demand |
| Exam Importance | High |
Just-in-Time (JIT) is a production and inventory management philosophy where materials are purchased and goods are produced only as needed, eliminating waste and reducing inventory holding costs.
JIT aims for zero or minimal inventory by synchronizing supply with demand, reducing lead times, and improving quality. It requires close coordination with suppliers and a stable production environment.
- Lean manufacturing companies
- Automotive assembly lines
- Reducing inventory carrying costs
- Improving cash flow through lower stock levels
Toyota uses JIT: parts arrive just before assembly, so inventory is minimal. This reduces storage costs, waste, and defects, but requires reliable suppliers and flexible processes.
A JIT system reduces average inventory from ₹10,00,000 to ₹2,00,000. Holding cost at 20% saves ₹1,60,000 per year. However, the company must manage supplier reliability and quick changeovers.
- Identify production flow and demand patterns.
- Establish pull-based production (kanban) instead of push.
- Reduce setup times and batch sizes.
- Develop close supplier relationships for frequent, small deliveries.
- Continuously improve to eliminate defects and waste.
| JIT vs. EOQ | EOQ calculates optimal order size for minimizing total cost; JIT aims for near-zero inventory, often ordering small frequent lots. |
|---|---|
| JIT vs. Traditional Inventory Management | Traditional holds buffer stock; JIT eliminates buffer and relies on perfect coordination. |
