Key differences between Job Costing and Contract Costing
Job costing is a specialized costing method used to track and accumulate production costs for distinct, custom-made products, services, or batches. Unlike mass production systems, it assigns direct materials, direct labor, and manufacturing overhead to specific identifiable jobs or customer orders. Each job is treated as a separate cost unit, allowing businesses to precisely determine its total cost and profitability. This method relies heavily on the Job Cost Sheet, a document that records all costs incurred for that particular job. Industries like construction, shipbuilding, custom furniture, legal services, and film production extensively use job costing. Since no two jobs are identical, this system enables accurate pricing, effective cost control, and detailed profitability analysis for each unique undertaking.
Characteristics of Job Costing:
1. Separate Identification of Each Job
Under job costing, every job, order, or contract is separately identified and assigned a specific job number. This unique identification helps distinguish one job from another and ensures proper recording of costs. All documents, including material requisitions, labour records, and cost sheets, mention the relevant job number. This systematic identification makes it easier to collect, analyse, and control costs for each individual order. It is particularly useful when different customers require products with different specifications. Thus, separate identification is a basic characteristic that ensures accurate cost accumulation and proper monitoring of every job.
2. Specific Cost Unit
The main cost unit in job costing is an individual job, order, contract, or specific customer requirement. Each job is treated as a separate unit for the purpose of cost accumulation and calculation. The cost of one job is not mixed with the cost of another job. This method is suitable where products or services differ according to customer specifications. For example, printing orders, furniture manufacturing, repair work, and construction projects may use job costing. Therefore, the individual job serves as the basis for collecting costs and determining the total cost and profitability.
3. Separate Job Cost Sheet
A separate Job Cost Sheet is prepared for every job undertaken by the organisation. This sheet records all costs associated with that particular job, including direct materials, direct labour, direct expenses, and allocated overheads. It provides a complete record of the cost incurred from the beginning until completion of the job. The Job Cost Sheet helps management determine the total cost and compare it with the estimated cost. It also supports pricing and profitability analysis. Therefore, maintaining a separate cost sheet is an important characteristic of an effective job costing system.
4. Direct Costs Charged Specifically
In job costing, direct costs are charged directly to the particular job that consumes the resources. Direct materials are identified through material requisition notes, while direct labour is recorded through time sheets or job cards. Direct expenses are also assigned specifically to the relevant job whenever possible. This ensures accurate determination of the actual cost of each job. Direct charging avoids unnecessary estimation and provides reliable cost information. It also helps management identify the resources consumed by different jobs. Thus, specific allocation of direct costs is a major characteristic of job costing.
5. Overheads Absorbed on Suitable Basis
Indirect expenses or overheads cannot be directly traced to a particular job. Therefore, they are allocated or absorbed using an appropriate basis, such as direct labour hours, machine hours, direct wages, or material cost. The selected basis should reasonably reflect the resources used by each job. Proper absorption of overheads ensures that the total job cost includes both direct and indirect production expenses. This helps prevent underestimation of job costs. Therefore, systematic allocation and absorption of overheads is an essential characteristic for accurate cost determination under job costing.
6. Jobs Differ According to Requirements
Jobs undertaken under this costing method usually differ in size, design, specifications, materials, and production requirements. Each customer may place an order according to their individual needs. Consequently, the resources consumed and the cost incurred may vary significantly from one job to another. Production is generally carried out according to specific customer instructions rather than standard continuous production. This characteristic makes job costing suitable for customised goods and specialised services. Therefore, variation in jobs and customer requirements forms an important feature of the job costing system.
7. Costs Accumulated Job Wise
All costs incurred during production are accumulated separately for each job. Materials, labour, expenses, and overheads are recorded under the specific job number. This enables management to determine the total cost of every individual order independently. Job wise accumulation also makes it possible to compare the cost and profitability of different jobs. Any unusual increase in cost can be identified and investigated easily. Proper accumulation of costs provides detailed information for planning and control. Hence, job wise collection and recording of costs is a fundamental characteristic of job costing.
8. Suitable for Customised Production
Job costing is mainly suitable for industries where goods or services are produced according to individual customer requirements. Each product may differ in design, size, quality, or other specifications. The production process is therefore organised separately for each order. Examples include printing presses, construction companies, repair workshops, interior decoration firms, and furniture manufacturers. Since every order may require different amounts of materials and labour, separate cost determination becomes necessary. Thus, suitability for customised and non standard production is an important characteristic of the job costing method.
9. Profitability Measured Job Wise
Job costing enables management to calculate the profit or loss earned from each individual job. The total cost recorded on the Job Cost Sheet is compared with the selling price or revenue received from the customer. This helps identify profitable and unprofitable jobs. Management can use this information to review pricing policies and decide whether similar jobs should be accepted in the future. Job wise profitability analysis also helps evaluate customer orders and production efficiency. Therefore, the ability to measure profitability separately for every job is an important feature of job costing.
10. Continuous Cost Monitoring
Job costing allows management to monitor costs throughout the progress of a job. As materials are issued and labour is utilised, the related costs are recorded regularly on the Job Cost Sheet. This provides updated information about the cost incurred at different stages of completion. Management can compare actual expenditure with estimated costs and identify possible cost overruns. Early detection enables corrective action before the job is completed. Therefore, continuous monitoring of job related costs helps improve cost control and ensures efficient utilisation of organisational resources.
Contract Costing
Characteristics of Contract Costing:
1. Large Scale and Long Duration Projects
Contract costing is mainly used for large scale projects that require a long period for completion. A contract may continue for several months or years depending on its size and complexity. Examples include construction of buildings, roads, bridges, dams, and ships. Since these projects involve substantial expenditure and extended production periods, costs must be carefully recorded and monitored. The long duration also requires periodic assessment of work completed and costs incurred. Therefore, large scale operations and long completion periods are important characteristics of contract costing.
2. Each Contract is a Separate Cost Unit
Under contract costing, every contract is treated as an independent cost unit. A separate contract account or cost record is maintained for each project. All costs relating to materials, labour, plant, expenses, and overheads are accumulated separately for the specific contract. This helps determine the total cost and profitability of each project independently. Costs of one contract are not mixed with those of another contract. Separate treatment also makes cost control and performance evaluation easier. Thus, each individual contract serves as the basic unit for cost accumulation.
3. Work Performed at Contract Site
Most of the work under contract costing is performed at a site selected for the particular project. Unlike factory production, workers, materials, machinery, and equipment are moved to the contract location. The contractor establishes necessary facilities and arrangements at the site for completing the work. Direct expenses incurred at the site can therefore be easily identified and charged to the respective contract. Site based operations require proper supervision and control of resources. Hence, performance of work at a specific contract site is a major characteristic of contract costing.
4. High Value of Contracts
Contracts generally involve a large amount of money because they relate to major construction and engineering projects. Significant investments are required for purchasing materials, employing labour, using machinery, and managing the project. Due to the high value involved, accurate recording and control of costs become essential. Even a small percentage of cost increase may result in a substantial financial impact. Management must therefore continuously monitor expenditure and progress. The high financial value of individual projects distinguishes contract costing from ordinary job costing and other costing methods.
5. Direct Costs are Easily Identifiable
Most costs incurred under a contract can be directly identified with the specific project. Materials sent to the site, wages paid to site workers, plant usage, and direct expenses are generally charged directly to the contract. This provides greater accuracy in determining the actual cost of the project. Since each contract operates at a separate location, direct cost identification becomes relatively convenient. Only common or indirect expenses require allocation on an appropriate basis. Therefore, easy identification and direct charging of major costs is an important feature of contract costing.
6. Use of Contract Account
A separate Contract Account is maintained for every contract undertaken by the contractor. This account records all costs incurred and the value of work completed under the project. Materials, wages, plant expenses, direct expenses, and allocated overheads are debited to the contract account. The value of work certified, work uncertified, and materials at site are appropriately recorded for calculating profit. The Contract Account provides a complete financial record of the project. Therefore, maintaining separate accounts for individual contracts is an essential characteristic of contract costing.
7. Work Certification by Independent Authority
In many contracts, completed work is inspected and certified by an architect, engineer, surveyor, or other authorised person. The certified value represents the portion of work completed according to agreed standards and specifications. Based on this certification, the contractor becomes entitled to receive payment from the contractee. Work certification provides an objective basis for measuring project progress and determining the amount payable. It also assists in calculating profit on incomplete contracts. Thus, certification of completed work by an authorised authority is an important feature of contract costing.
8. Payments Made in Instalments
Payments under contract costing are generally not made only after the complete project is finished. Instead, the contractor receives payments in instalments according to the value of work completed and certified. A certain percentage of the certified value may be retained by the contractee as retention money. This system helps contractors maintain sufficient working capital during long duration projects. Instalment payments also reduce the financial burden of waiting until project completion. Therefore, stage wise payments based on work progress are a common characteristic of contract costing.
9. Retention Money is Common
Retention money refers to a portion of the payment withheld by the contractee from the amount due to the contractor. It acts as a safeguard to ensure proper completion of the contract according to agreed specifications and quality standards. The retained amount is usually paid after satisfactory completion of the project or after the defect liability period. Retention money protects the contractee against incomplete or defective work. It also encourages contractors to maintain quality and fulfil contractual obligations. Therefore, the existence of retention money is a distinctive feature of contract costing.
10. Profit Recognition Before Completion
Contracts often continue for long periods, making it impractical to wait until final completion for recognising profit. Therefore, a reasonable portion of profit may be recognised on incomplete contracts based on the stage of completion and accounting principles. However, prudence is followed to avoid recognising excessive or uncertain profits. The amount of profit transferred depends on factors such as work certified, cash received, total contract value, and estimated costs. Thus, controlled recognition of profit during the progress of long term contracts is an important characteristic of contract costing.
Key differences between Job Costing and Contract Costing
| Basis | Job Costing | Contract Costing |
|---|---|---|
| Nature | Individual specialised jobs undertaken | Large scale contracts undertaken |
| Cost Unit | Individual job or order | Individual contract or project |
| Size | Generally smaller production assignments | Generally large construction projects |
| Duration | Usually completed within shorter periods | Usually requires longer completion periods |
| Work Location | Work may occur anywhere | Work mainly occurs at sites |
| Product Nature | Often customised products or services | Mainly construction or engineering projects |
| Contract Value | Generally lower monetary value | Generally very high monetary value |
| Cost Records | Separate job cost sheet | Separate contract account maintained |
| Cost Collection | Costs accumulated job wise | Costs accumulated contract wise |
| Work Certification | Generally not required | Usually required for payments |
| Payment Method | Usually received after delivery | Usually received in instalments |
| Retention Money | Generally not applicable | Commonly retained by contractee |
| Profit Recognition | Usually determined after job completion | May recognise profit periodically |
| Examples | Printing, repairs, furniture manufacturing | Roads, bridges, buildings, dams |
| Main Focus | Costing individual customer orders | Costing long term major projects |