Job Order Costing
Job order costing assigns manufacturing or service costs to distinct jobs, projects, customers, or contracts. It is most useful when each job is different enough that managers need to track materials, labor, and overhead separately.
Standards Note: Job order costing may support inventory valuation and cost of goods sold in accounting systems, but this page presents the topic as a managerial accounting study tool. The randomized examples simplify real systems and are intended for learning, planning, and analysis and external reporting.
How is Job Order Costing Used, and Why Study It?
Job order costing fits work where each job can be separately identified and traced. The system accumulates direct materials, direct labor, and applied manufacturing overhead on a job cost sheet.
| Management use | Job costing question | Decisioning |
|---|---|---|
| Pricing | What cost should be considered when quoting a job? | Use expected direct materials, direct labor, and applied overhead to support pricing decisions. |
| Cost tracking | What resources were used by this job? | Trace direct costs and apply overhead to monitor job performance. |
| Profitability review | Did the job generate enough revenue to cover assigned costs? | Compare job revenue with assigned job cost to evaluate margin. |
| Overhead control | Was manufacturing overhead applied above or below actual overhead? | Close or allocate overapplied or underapplied overhead and review overhead drivers. |
| Inventory flow | How do costs move from materials, labor, and overhead into WIP, finished goods, and COGS? | Track product costs through the accounting system until the job is sold. |
Core idea: Job order costing connects resource use to a specific job. Managers use the job cost sheet to assign cost, evaluate job profitability, support pricing, and review overhead application.
Key Terms: Definitions and Use
Job order costing depends on tracing direct costs to specific jobs and applying manufacturing overhead using a predetermined overhead rate. The key terms below emphasize how each term is used in a practical cost flow.
| Key term | Definition | Practical situation or guidance |
|---|---|---|
| Job order costing | A costing system that accumulates costs separately for each job, project, customer, or contract. | Use when jobs are customized or meaningfully different from one another, such as repair jobs, consulting projects, custom manufacturing, legal matters, or construction contracts. |
| Process costing | A costing system that averages costs across many similar units produced through repeated processes. | Use when units are homogeneous, such as food processing, chemical production, or bottling operations. |
| Operations costing | A hybrid costing approach using features of job order and process costing. | Use when products share common processing steps but also have customized materials, features, or batches. |
| Source document | A document that provides evidence for assigning costs to jobs or overhead. | Use to support job cost sheet entries, such as material requisition forms and labor time tickets. |
| Job cost sheet | A record that accumulates direct materials, direct labor, and applied manufacturing overhead for a specific job. | Use as the central cost record for pricing, billing, job profitability, and cost control. |
| Materials requisition form | A source document authorizing materials to be issued from inventory to production. | Use to charge direct materials to a job or indirect materials to Manufacturing Overhead. |
| Labor time ticket | A source document showing time worked by employees on jobs or indirect activities. | Use to charge direct labor to jobs and indirect labor to Manufacturing Overhead. |
| Manufacturing overhead | Indirect manufacturing costs that cannot be conveniently traced to specific jobs. | Use for factory costs such as indirect materials, indirect labor, utilities, maintenance, supervision, depreciation, and factory support. |
| Indirect materials | Materials used in production but not conveniently traced to a specific job. | Route through Manufacturing Overhead and charging directly to one job. |
| Cost driver | A factor that causes or is associated with overhead cost. | Use to select an overhead base, such as direct labor hours, machine hours, or direct labor cost. |
| Allocation base | The activity measure used to apply overhead to jobs. | Choose a base that reasonably explains why overhead costs are incurred. |
| Predetermined overhead rate | An estimated rate used to apply manufacturing overhead during the period. | Use because actual overhead is not fully known until the end of the period, but jobs need costs during the period. |
| Applied manufacturing overhead | Overhead assigned to jobs using the predetermined overhead rate and actual allocation base. | Add to Work in Process and the job cost sheet. Job cost uses applied overhead, not actual overhead. |
| Actual manufacturing overhead | Indirect manufacturing costs actually incurred during the period. | Accumulate in Manufacturing Overhead and compare to applied overhead at period end. |
| Underapplied overhead | Actual manufacturing overhead exceeds applied manufacturing overhead. | Usually increase Cost of Goods Sold at period end when the balance is closed to COGS. |
| Overapplied overhead | Applied manufacturing overhead exceeds actual manufacturing overhead. | Usually decrease Cost of Goods Sold at period end when the balance is closed to COGS. |
| Raw Materials Inventory | Inventory account containing materials before they are issued to production. | Credit this account when materials are requisitioned into production. |
| Work in Process Inventory | Inventory account containing costs of incomplete jobs. | Debit this account for direct materials, direct labor, and applied overhead while the job is in production. |
| Finished Goods Inventory | Inventory account containing completed but unsold jobs. | Debit this account when a job is completed and transferred out of Work in Process. |
| Cost of Goods Manufactured | The cost of jobs completed during the period. | Use when completed jobs are transferred from Work in Process to Finished Goods. Also called cost of goods completed in some contexts. |
| Cost of Goods Completed | Another label for the cost of jobs completed during the period. | Use as a synonym for cost of goods manufactured when the context emphasizes completed jobs. |
| Cost of Goods Sold | The cost of completed jobs that have been sold. | Recognize as an expense when finished goods are sold. Adjust for underapplied or overapplied overhead if closed directly to COGS. |
| Cost of Goods Manufactured Report | A report showing manufacturing costs added and the cost of goods completed. | Use to organize beginning WIP, current manufacturing costs, ending WIP, and COGM. |
Common Terminology
Some concepts are referred to using various terms. This table connects related terminology with shared concepts.
| Related terms | Practical meaning | Typical situation |
|---|---|---|
| Indirect manufacturing cost ↔ Manufacturing overhead | Factory costs that cannot be directly traced to one job. | Factory rent, indirect materials, maintenance, supervision, and utilities. |
| Assign ↔ Allocate ↔ Apply | Put cost onto a job, product, department, or account. | Applying overhead to Work in Process using the predetermined overhead rate. |
| Cost driver ↔ Allocation base ↔ Overhead base | The activity measure used to distribute overhead. | Direct labor hours, machine hours, or direct labor cost. |
| Overhead rate ↔ Burden rate | The rate used to apply overhead. | Estimated overhead divided by estimated allocation base. |
| Cost of Goods Manufactured ↔ Cost of Goods Completed | The cost of jobs finished during the period. | Transfer from Work in Process to Finished Goods. |
Key Formulas and Helpful Reminders
Job order costing formulas track the flow of manufacturing costs through Raw Materials, Work in Process, Finished Goods, and Cost of Goods Sold.
| Formula | Meaning | Practical situation |
|---|---|---|
| Predetermined Overhead Rate = Estimated Total Overhead ÷ Estimated Total Cost Driver | Estimated overhead rate used during the period. | Use before actual overhead is known so jobs can be costed throughout the period. |
| Applied Overhead = Predetermined OH Rate × Actual Cost Driver | Overhead assigned to jobs. | Use actual machine hours, direct labor hours, or another base used by the job. |
| Underapplied Overhead = Actual Overhead > Applied Overhead | Too little overhead was applied to jobs. | Increase Cost of Goods Sold if the balance is closed directly to COGS. |
| Overapplied Overhead = Actual Overhead < Applied Overhead | Too much overhead was applied to jobs. | Decrease Cost of Goods Sold if the balance is closed directly to COGS. |
| Direct Materials Used = Beginning Raw Materials + Purchases − Ending Raw Materials | Materials moved into production. | Use when raw materials inventory balances are provided. |
| Total Manufacturing Costs = Direct Materials Used + Direct Labor + Applied Manufacturing Overhead | Current manufacturing costs assigned to production. | Use applied overhead for job cost and COGM calculations unless the problem specifically asks for actual overhead analysis. |
| COGM = Beginning WIP + Total Manufacturing Costs − Ending WIP | Cost of jobs completed during the period. | Use when moving costs from Work in Process to Finished Goods. |
| COGS = Beginning Finished Goods + COGM − Ending Finished Goods | Cost of completed goods that were sold. | Use when moving costs from Finished Goods to the income statement. |
Helpful Reminders
- Actual direct materials and direct labor are added directly to Work in Process Inventory.
- Indirect manufacturing costs are added to Manufacturing Overhead.
- Manufacturing overhead is applied to Work in Process Inventory using the predetermined overhead rate and the actual cost driver.
- Any cost added to Work in Process Inventory should also appear on the job cost sheet.
- The cost of jobs transferred out of Work in Process and into Finished Goods is called Cost of Goods Manufactured or Cost of Goods Completed.
- Cost of Goods Sold is initially based on actual direct materials, actual direct labor, and applied manufacturing overhead.
- A debit balance in Manufacturing Overhead means overhead is underapplied and usually increases Cost of Goods Sold.
- A credit balance in Manufacturing Overhead means overhead is overapplied and usually decreases Cost of Goods Sold.
Cost Flow Memory Aid
Raw Materials
→ Work in Process
→ Finished Goods
→ Cost of Goods Sold
Direct materials + direct labor + applied overhead
→ Job cost sheet
→ Work in ProcessProcedure Checklist and Decision Patterns
Use this section after working a job order costing problem. It provides procedural checks that confirm whether the cost flow is internally consistent and useful for management decisions.
| Procedure pattern | Decision checklist |
|---|---|
| Apply overhead to the job cost sheet using the predetermined overhead rate and the actual allocation base used by the job. | Apply overhead using the predetermined overhead rate and actual allocation base used by the job. |
| Apply the overhead variance adjustment in the correct direction. | Debit balance means underapplied and usually increases COGS. Credit balance means overapplied and usually decreases COGS. |
| Trace direct costs to jobs and route indirect manufacturing costs through Manufacturing Overhead. | Trace only direct materials and direct labor to jobs. Route indirect items through Manufacturing Overhead. |
| Compute the predetermined overhead rate from estimated overhead and estimated allocation base. | Use estimated overhead and estimated allocation base to compute the rate. |
| Compare applied overhead to actual overhead to classify the variance. | Applied greater than actual means overapplied. Actual greater than applied means underapplied. |
| Adjust Cost of Goods Sold based on whether overhead is overapplied or underapplied. | Overapplied overhead decreases COGS. Underapplied overhead increases COGS. |
| Transfer completed jobs from Work in Process to Finished Goods. | Keep incomplete jobs in Work in Process. |
| Transfer sold jobs from Finished Goods to Cost of Goods Sold. | Completed but unsold jobs remain in Finished Goods Inventory. |
| Classify manufacturing costs as product costs and selling, general, and administrative costs as period expenses. | Manufacturing costs become product costs. Selling, general, and administrative costs are period expenses. |
How to Work a Job Order Costing Problem
- Identify the job. Determine whether the organization is accumulating costs for a distinct job, project, customer, or contract.
- Trace direct costs. Add direct materials and direct labor to the job cost sheet.
- Apply overhead. Calculate the predetermined overhead rate and multiply it by the job's actual allocation base.
- Calculate total job cost. Add direct materials, direct labor, and applied manufacturing overhead.
- Follow the cost flow. Move costs from raw materials to WIP, from WIP to finished goods, and then to COGS when sold.
- Analyze overhead variance. Compare actual overhead and applied overhead to determine whether overhead is overapplied or underapplied.
References
Datar, S. M., & Rajan, M. V. (2026). Horngren's cost accounting: A managerial emphasis. Pearson. https://www.pearson.com/en-us/subject-catalog/p/horngrens-cost-accounting/P200000012609
Garrison, R. H., Noreen, E. W., Brewer, P. C., & Montague, N. R. (2026). Managerial accounting. McGraw Hill. https://www.mheducation.com/highered/product/managerial-accounting-garrison.html
OpenStax. (2022). Principles of Accounting, Volume 2: Managerial Accounting. Rice University. https://openstax.org/details/books/principles-managerial-accounting
Whitecotton, S., Libby, R., & Phillips, F. (2025). Managerial accounting (2025 Release). McGraw Hill.