Job, Batch, Contract and Service Costing

Introduction

Organizations do not all produce identical units continuously. A construction company builds distinct projects, a printing business produces customer-specific orders, a hospital provides diverse patient services, and a repair workshop handles jobs with different materials, labour requirements and completion times. In such environments, average cost for the whole organization is insufficient for pricing, control and profitability analysis.

Job, batch, contract and service costing are forms of specific-order costing. They accumulate costs for an identifiable job, batch, contract or service rather than for a homogeneous production process. The central managerial question is:

What resources were consumed by this particular output, and what revenue and profit did it generate?

These systems support quotation, pricing, cost control, inventory valuation, performance evaluation and profitability analysis. They also require disciplined identification of cost objects, reliable source documents and appropriate treatment of overhead.

Learning Objectives

After studying this chapter, you should be able to:

• distinguish job, batch, contract and service costing;
• identify direct and indirect costs in specific-order environments;
• prepare job cost sheets and calculate unit costs;
• apply predetermined overhead rates and reconcile under- or over-absorption;
• calculate batch costs and economic batch quantities;
• explain contract costing, escalation clauses, retention money and profit recognition;
• calculate operating costs and cost per service unit;
• evaluate profitability and operational performance;
• identify limitations, ethical risks and technology requirements in costing systems.

1. The Nature of Specific-Order Costing

A cost object is anything for which management wishes to measure cost. It may be a customer order, construction contract, production batch, delivery route, patient episode or repair assignment. A cost unit is the unit used to express cost, such as one machine, one tonne, one passenger-kilometre or one patient-day.

Specific-order costing differs from process costing. Process costing averages costs over large volumes of substantially identical output. Specific-order costing traces costs to separately identifiable outputs.

The choice of system should reflect the production technology and information needs, not merely the industry label. A large manufacturer may use process costing for standard products and job costing for customized products.

2. Common Cost Structure

Direct and indirect costs

A direct cost can be economically and conveniently traced to a cost object. Direct materials and direct labour are common examples. An indirect cost benefits several cost objects and must be allocated or apportioned, such as factory rent, supervision and depreciation.

The basic job-cost equation is:

where:

• C_j = total cost of job j;
• DM_j = direct materials charged to job j;
• DL_j = direct labour charged to job j;
• OH_j = overhead absorbed by job j.

The equation assumes that all relevant production costs are represented by these three categories. Selling and administrative costs are normally excluded from manufacturing cost but may be included in a full-cost quotation.

Direct materials

Materials are charged using material requisitions or electronic issue records. The cost assigned should follow the organization’s inventory policy, such as FIFO or weighted average. Materials returned to stores must be credited to the relevant job. Waste requires separate treatment:

• normal, unavoidable waste may be included in production overhead or the cost of good output;
• abnormal waste should generally be reported separately as a loss;
• saleable scrap may reduce the cost of the related job or be credited to factory overhead, according to policy.

Direct labour

Labour is traced through time sheets, job cards, barcode scans or digital time records. A labour charge is calculated as:

where h_j is verified hours worked on job j and r is the appropriate labour cost per hour. The rate should be defined clearly: it may include basic wages only, or wages plus employer contributions and other employment costs.

Manufacturing overhead

Overhead is assigned using an overhead absorption rate (OAR):

where B is the budgeted overhead for a cost centre and A is the budgeted activity base. The activity base may be direct labour hours, machine hours, direct labour cost or units produced. The base should have a credible causal relationship with overhead consumption.

Overhead absorbed by a job is:

where a_j is the actual activity used by job j. This formula assumes a constant rate within the relevant activity range and that the chosen base reasonably represents resource consumption.

If budgeted factory overhead is $240,000 and budgeted machine hours are 12,000, the machine-hour OAR is:

A job using 35 machine hours absorbs $700. The result is dimensionally consistent: machine hours × dollars per machine hour = dollars.

3. Job Costing

Meaning and purpose

Job costing accumulates costs for a distinct job performed to a customer’s specification. A job may be completed in hours or may continue for several months, but it remains separately identifiable.

A job cost sheet is the principal record. It normally contains the job number, customer, description, dates, materials, labour, overhead, total cost, units, selling price and profit.

Worked Example 1: Job cost sheet

Illustrative data for Job J417 are:

• direct materials: $8,400;
• direct labour: 180 hours at $26 per hour;
• machine usage: 90 hours;
• machine-hour overhead rate: $18 per hour;
• administration and selling costs are estimated at 12% of production cost;
• desired profit is 25% of selling price;
• output is 60 units.

Direct labour is $4,680. Factory overhead is $1,620. Therefore:

If profit is 25% of selling price, selling price is not full cost × 1.25. Instead:

where SP is selling price, C is full cost and p is the profit percentage expressed as a decimal. Thus, SP = $16,464 ÷ 0.75 = $21,952. The selling price per unit is $21,952 ÷ 60 = $365.87 approximately. Profit is $5,488, which is 25% of selling price.

This distinction is important. A 25% mark-up on cost would produce $20,580, whereas a 25% margin on sales requires $21,952.

Job profitability

After completion, actual cost should be compared with the quotation or standard cost. Useful measures include:

A positive cost variance indicates that actual cost exceeded budget. Variance investigation should distinguish price, usage, efficiency, scope-change and scheduling causes.

Work in progress

At the reporting date, incomplete jobs are work in progress (WIP). Their cost consists of accumulated direct costs and absorbed overhead, subject to the applicable accounting framework. A job should not be treated as completed merely because most physical work has been performed; completion criteria must be established consistently.

4. Batch Costing

Batch costing is a variation of job costing in which a group of identical or similar units is treated as one cost object. The batch may be a production run, bakery order, pharmaceutical lot or printing run.

The denominator should normally be good units available for sale. Normal process loss may be incorporated into the expected cost of good output; abnormal loss should be reported separately.

Worked Example 2: Batch cost

A batch contains 2,000 units. Direct materials cost $9,600, direct labour is 320 hours at $22 per hour, and overhead is absorbed at $14 per labour hour. Normal loss is 5% of input, and no abnormal loss occurs.

Direct labour is $7,040 and overhead is $4,480. Total batch cost is:

Good output is 2,000 × (1 − 0.05) = 1,900 units. Cost per good unit is $21,120 ÷ 1,900 = $11.12 approximately.

Economic batch quantity

When each batch incurs a setup cost and inventory holding cost, management may estimate an economic batch quantity (EBQ):

where D is annual demand in units, S is setup cost per batch, and H is annual holding cost per unit. The model assumes known and constant demand, constant setup and holding costs, no shortages, instantaneous replenishment and identical units. It is a planning model, not a guarantee of the actual optimum when capacity, learning, discounts or uncertain demand are significant.

5. Contract Costing

Contract costing applies to large, separately identifiable undertakings, usually performed at a customer’s site and extending over a substantial period. Examples include roads, bridges, buildings, shipbuilding and major information-system implementations.

A contract account records:

• direct materials delivered to site;
• site labour and subcontractors;
• plant and equipment used;
• site overheads;
• head-office overheads allocated under a consistent policy;
• work certified and uncertified;
• progress billings, cash received and retention money.

Contract cost and work certified

The cost of a contract to date can be expressed as:

The formula assumes that transfers and recoveries are separately recorded and not already excluded from the component costs.

Work certified is work approved by an architect, engineer, quantity surveyor or other authorized professional. Work uncertified is completed work not yet formally approved. Retention money is the portion of certified value withheld by the customer to protect against defects or incomplete performance.

If certified work has a value of $800,000 and the retention rate is 10%, cash or amount currently due may be $720,000, while $80,000 is retention receivable. The accounting treatment depends on the contract and reporting framework; retention is not automatically a cost.

Contract profit recognition

Long-term contracts create a timing problem: costs arise before final profit is known. Profit recognition must follow the applicable financial reporting standard and the entity’s policy. A simplified educational approach for a profitable contract may use an estimate of total cost and a measure of progress:

A cost-to-cost progress measure is:

These formulas apply only when progress and outcome can be measured reliably and when the relevant reporting standard permits this approach. If a contract is expected to make a loss, the expected loss is generally recognized promptly under applicable standards rather than postponed until completion. Students must distinguish management costing estimates from statutory revenue-recognition requirements.

Contract escalation and variations

Construction contracts often contain escalation clauses for labour, materials or inflation. A variation may increase or decrease scope. Good contract costing separately identifies:

• original contract value;
• approved variations;
• claims and disputed amounts;
• revised estimated cost;
• liquidated damages and incentives;
• foreign-exchange exposure.

Unapproved claims should not be treated as certain revenue merely because management expects recovery. Documentation and probability of recovery are essential.

6. Service Costing

Service costing measures the cost of providing an intangible or semi-intangible service. Unlike manufactured goods, services are often produced and consumed simultaneously, cannot be stored economically and involve substantial customer-contact and support costs.

Examples include transport, hotels, hospitals, education, banking, telecommunications, maintenance and professional services.

Composite cost units

A service cost unit combines two dimensions when a single dimension is inadequate:

• passenger-kilometre;
• tonne-kilometre;
• room-night;
• patient-day;
• student-credit-hour;
• consultant-hour.

The general formula is:

For transport:

The formula assumes that passengers and distance are measured on a consistent basis and that the selected unit captures the principal driver of cost.

Worked Example 3: Transport service costing

A bus operation incurs annual operating costs of $1,260,000. It operates 6 buses, each for 300 days, travelling 250 kilometres per day. Average occupancy is 70% of 40 seats.

Total seat-kilometres are:

Passenger-kilometres are:

Cost per passenger-kilometre is:

If management divided by seat-kilometres instead, it would obtain $0.07 per seat-kilometre. That is not necessarily wrong, but it answers a different question: scheduled capacity cost rather than cost of actual passenger movement.

Service department costing

Service organizations frequently use a combination of direct tracing and activity-based allocation. A consulting firm may trace consultant time to a client, while allocating software subscriptions, office rent and quality assurance through suitable cost pools. A hospital may separate clinical labour, diagnostic departments, theatres, beds and administrative support.

A service cost sheet should identify service volume, capacity, utilization, cancellations, rework, customer-contact time and non-billable support time. A high utilization rate can reduce unit cost, but excessive utilization may reduce service quality and increase employee burnout.

7. Integrated Case: Northstar Custom Interiors

This is an illustrative case. Northstar Custom Interiors manufactures customized office furniture and also undertakes installation contracts.

Background

Northstar uses job costing for individual customer orders. Its installation division uses contract costing because projects last several months. Management has observed that reported profit is volatile and that some apparently profitable jobs generate cash shortages.

Problem

A customer orders 80 customized workstations. Estimated direct materials are $28,000 and direct labour is 600 hours at $24 per hour. The production department applies overhead at $30 per direct labour hour. Delivery and installation are expected to require 160 hours at $22 per hour, with installation overhead applied at $18 per hour. Selling and administration are estimated at 10% of manufacturing and installation cost. The customer will pay $78,000, with 10% retained until satisfactory installation.

Analysis

Production direct labour is $14,400 and production overhead is $18,000. Installation direct labour is $3,520 and installation overhead is $2,880. Total direct and absorbed operating cost before selling and administration is:

Selling and administration are $6,680. Estimated full cost is $73,480. Estimated profit is:

Profit margin is approximately 5.79% of revenue. The initial cash due, excluding later adjustments, is $70,200 because 10% is retained. Thus, a profitable job can still create a temporary cash requirement of $3,280 relative to full cost before considering payment timing and other working-capital needs.

Approach and solution

Northstar should:

1. maintain separate production and installation cost records;
2. verify labour through job cards and installation sign-offs;
3. record retention as an amount receivable rather than a cost;
4. update the forecast when customer variations are approved;
5. compare actual materials, hours and overhead with the quotation;
6. avoid recognizing disputed variation revenue until recognition criteria are met;
7. report both accounting profit and cash-flow exposure to management.

Outcome and learning points

The case demonstrates that a job cost sheet answers a profitability question, while a contract schedule also answers progress, billing, retention and cash-flow questions. It also shows why a percentage margin must be interpreted alongside cost recovery, utilization and collection risk.

8. Controls, Technology and Professional Judgment

An effective costing system depends on controls as much as on formulas. Important controls include sequential job numbers, authorized material requisitions, independent approval of overtime, reconciliation of labour time to payroll, review of overhead rates and closure of completed jobs.

Enterprise resource planning systems can connect purchasing, inventory, payroll, production scheduling, customer orders and billing. Barcode scanning, mobile time capture and machine sensors may improve accuracy. Artificial intelligence can assist with cost forecasts, anomaly detection and quotation analysis, but it does not remove the need for human judgment. Poor source data, biased historical quotations or an inappropriate cost driver can produce confidently wrong results.

Managers should distinguish:

• actual cost from absorbed cost;
• controllable from uncontrollable cost;
• normal from abnormal loss;
• accounting profit from cash generation;
• customer profitability from short-term contribution;
• estimated progress from legally certified progress.

Ethical and governance issues

Costing information can influence tenders, bonuses, transfer prices and investment decisions. Ethical risks include deliberately understating costs to win a contract, shifting costs between jobs, charging customers for rework caused by the supplier, inflating progress claims and hiding abnormal waste. Strong governance requires transparent assumptions, audit trails, segregation of duties and consistent policies.

A cost allocation method should not be changed merely to make a department or customer appear more profitable. If a change is justified by technology or improved causality, its impact should be documented and communicated.

9. Limitations and Best Practices

Specific-order costing is powerful but not exact. Overhead rates are often based on forecasts; customized jobs may consume support resources unevenly; shared resources are difficult to trace; and estimates may become obsolete after scope changes. Excessive detail can also make a system expensive without improving decisions.

Best practices are to:

• define the cost object and cost unit before work begins;
• use multiple cost centres where resource consumption differs materially;
• select drivers based on causality rather than convenience;
• distinguish quotation, operational and statutory costing purposes;
• update estimates for approved changes and changed conditions;
• analyze variances promptly while evidence is available;
• measure quality, rework, delivery reliability and customer satisfaction alongside cost;
• reconcile subsidiary job records with the general ledger;
• review rates periodically and investigate material under- or over-absorption.

Chapter Summary

Job costing accumulates direct materials, direct labour and absorbed overhead for an identifiable customer order. Batch costing applies the same logic to a group of similar units and expresses cost per good unit. Contract costing addresses large, long-duration undertakings by tracking site costs, work certified, retention, progress, variations and estimated profit. Service costing measures operating costs against appropriate service units, including composite units such as passenger-kilometres and patient-days.

The central formulas are based on accurate cost identification, an appropriate overhead driver and a clearly defined denominator. Predetermined overhead rates support timely costing but can create under- or over-absorption. Contract profit and revenue recognition must be distinguished from internal estimates and must follow applicable reporting requirements. Effective systems combine source-document discipline, technology, ethical controls and managerial interpretation.

Key Terms

Cost object: Anything for which cost is measured.

Cost unit: A quantitative unit used to express cost.

Specific-order costing: Costing that accumulates costs by identifiable job, batch or contract.

Job costing: Cost accumulation for a separately identifiable customized order.

Batch costing: Cost accumulation for a group of similar units produced together.

Contract costing: Costing for a large, separately identifiable long-term undertaking.

Service costing: Measurement of the cost of providing services.

Direct cost: Cost economically and conveniently traceable to a cost object.

Indirect cost: Cost benefiting multiple cost objects and requiring allocation.

Overhead absorption rate: Budgeted overhead divided by a selected budgeted activity base.

Job cost sheet: Record summarizing the costs and profitability of a job.

Work in progress: Partly completed output at a reporting date.

Work certified: Contract work formally approved by an authorized certifier.

Retention money: Amount withheld from a contractor until specified conditions are met.

Normal loss: Expected unavoidable loss under efficient operating conditions.

Abnormal loss: Loss exceeding the expected normal level.

Composite cost unit: Service unit combining two measures, such as passenger-kilometres.

Economic batch quantity: Batch size balancing setup cost and inventory holding cost under stated assumptions.

Cost driver: Factor that causes or explains changes in resource consumption.

Under- or over-absorption: Difference between actual overhead incurred and overhead absorbed.

Review Questions

Short Answer Questions

1. What is a cost object, and why is it important in specific-order costing?
2. Distinguish direct costs from indirect costs using one example of each.
3. What information is normally included on a job cost sheet?
4. Explain the meaning of retention money in contract costing.
5. Why may passenger-kilometres be a more useful cost unit than buses operated?

Long Answer Questions

1. Explain the principles of job costing and discuss how overhead should be assigned to jobs.
2. Compare job, batch, contract and service costing, including their applications and limitations.
3. Discuss the accounting and managerial significance of work certified, work uncertified and contract variations.
4. Explain the economic batch quantity model, its assumptions and its limitations in practice.
5. Evaluate the role of technology, controls and professional ethics in maintaining reliable costing information.

Analytical / Application Questions

1. A job has direct materials of $18,000, direct labour of 240 hours at $25 per hour and overhead absorbed at $16 per labour hour. Calculate total production cost and cost per unit if 120 units are produced. Explain one limitation of the calculated unit cost.
2. A transport company incurs annual costs of $900,000 and provides 9,000,000 passenger-kilometres. It is considering a route change that would increase annual cost by $90,000 and passenger-kilometres by 1,500,000. Calculate the current and incremental cost per passenger-kilometre and advise whether the change appears operationally attractive on cost evidence alone.
3. A long-term contract has a price of $2,400,000, estimated total cost of $2,000,000 and cost incurred to date of $800,000. Using a cost-to-cost progress measure, calculate progress and indicative profit recognized, then explain why the result must be checked against the applicable financial reporting standard and evidence about the contract outcome.

Multiple Choice Questions with Answers

Question 1

Which costing system is most appropriate for a separately identifiable customized customer order?

A. Process costing

B. Job costing

C. Joint-product costing

D. Marginal costing

Correct Answer: B. Job costing

Question 2

Budgeted overhead is $180,000 and budgeted machine hours are 9,000. What is the machine-hour overhead absorption rate?

A. $2 per machine hour

B. $20 per machine hour

C. $162 per machine hour

D. $1,620 per machine hour

Correct Answer: B. $20 per machine hour

Question 3

A batch costs $15,000 and produces 1,200 good units. What is the cost per good unit?

A. $8.00

B. $12.50

C. $13.50

D. $18.00

Correct Answer: B. $12.50

Question 4

Which item is normally associated particularly with contract costing?

A. Equivalent production units

B. Retention money

C. Economic order quantity only

D. Conversion cost percentage only

Correct Answer: B. Retention money

Question 5

If profit is 20% of selling price and full cost is $40,000, what selling price is required?

A. $48,000

B. $50,000

C. $52,000

D. $60,000

Correct Answer: B. $50,000

Question 6

Which is an appropriate composite service cost unit for a passenger transport operator?

A. Machine hour

B. Direct labour dollar

C. Passenger-kilometre

D. Batch setup

Correct Answer: C. Passenger-kilometre

Question 7

In a cost-to-cost progress measure, progress is calculated as:

A. Revenue billed divided by cash received

B. Cost incurred to date divided by estimated total cost

C. Profit divided by contract price

D. Retention divided by work certified

Correct Answer: B. Cost incurred to date divided by estimated total cost

Question 8

Which cost is generally directly traceable to a specific job?

A. Factory rent benefiting all jobs

B. Chief executive salary

C. Material issued specifically to the job

D. General advertising

Correct Answer: C. Material issued specifically to the job

Question 9

Under-absorption of overhead occurs when:

A. Absorbed overhead exceeds actual overhead

B. Actual overhead exceeds absorbed overhead

C. Direct materials exceed direct labour

D. Selling price exceeds full cost

Correct Answer: B. Actual overhead exceeds absorbed overhead

Question 10

A transport service has total cost of $1,260,000 and provides 12,600,000 passenger-kilometres. What is cost per passenger-kilometre?

A. $0.01

B. $0.05

C. $0.10

D. $1.00

Correct Answer: C. $0.10