ACC2200 · Introduction to Management Accounting
Service Costing
Service Costing is the Week 8 topic in ACC2200 Introduction to Management Accounting at Monash University, where the output being costed is a service — a legal opinion, an airline check-in, a night in a hotel — rather than a physical product. Because services are intangible and perishable there is no inventory to value, so every service cost is a period cost and there is no COGS or under/over-applied overhead adjustment. The skill tested is matching the service to its archetype — professional (job costing), service shop (hybrid) or mass service (process/averaging) — then computing a cost per service unit or a professional-firm job cost and fee, and adding the discussion the marker wants.
What this chapter covers
- 011. Features of a service — intangible, perishable, often unique, labour-dominated — and why they change how you cost it
- 022. No inventory to value → no product/period split → all service costs are period costs (no COGS, no over/under-applied adjustment)
- 033. Choosing a cost unit — billable hour, passenger, transaction, room-night, kWh
- 044. The three archetypes: professional (job), service shop (hybrid), mass service (process) — matched by contact, customisation and volume
- 055. Professional-firm job costing — professional labour + applied overhead on a labour-cost or labour-hour base
- 066. Job costing vs job billing — the charge-out rate bundles overhead recovery and profit, so it is not the cost
- 077. Mass-service averaging — cost per unit = total period cost ÷ number of service units
- 088. The discussion layer — why the per-unit average is only roughly reliable, and the ethics of time-based billing
Professional-firm job cost, cost-plus fee and charge-out fee
- +1(a) Overhead applied = predetermined rate × professional-labour cost = 130% × 18,000 = $23,400.
- +2(b) Total job cost = disbursements + professional labour + applied overhead = 4,800 + 18,000 + 23,400 = $46,200.
- +2(c) Cost-plus fee = total cost × (1 + margin) = 46,200 × 1.30 = $60,060.
- +3(d) Charge-out fee = hours × charge-out rate + disbursements at cost = 90 × 340 + 4,800 = 30,600 + 4,800 = $35,400.
- +2(d, discuss) The two bases give very different fees for the same work. A client often prefers the charge-out basis because the hourly rate is transparent and agreed up front, whereas cost-plus exposes them to the firm's actual overhead recovery — but note the charge-out rate already bundles overhead and profit, so it is a billing figure, not the job's cost.
Key terms
- Service organisation
- An entity whose output is an intangible, perishable service consumed as it is produced (a consultation, a flight, a night's stay). It holds no inventory of finished output, so there is no product cost and no COGS — every cost is a period cost.
- Professional service firm
- A high-contact, highly customised, low-volume service (medical, legal, accounting, consulting) that sells professional labour. It is costed job-by-job, accumulating direct professional labour plus a share of overhead per client job.
- Mass service
- A low-contact, standardised, high-volume service (utilities, airline check-in, postal delivery). It is costed with process/averaging logic: pool the period's costs and divide by the number of service units.
- Service shop
- A service in the middle of the spectrum on contact, customisation and volume (banks, hotels, cafés, car repair). It typically uses hybrid costing, blending job and process elements.
- Cost unit
- The unit of service the cost is measured against — a billable hour or job (professional), a transaction or visit (service shop), a passenger or kWh (mass). Choosing the cost unit comes before any averaging.
- Billable (chargeable) hours
- The client-serviceable hours a professional actually charges for — the denominator of a labour cost or charge-out rate. It is less than total paid hours, because training, admin and idle time are non-billable and get absorbed into the rate.
- Charge-out rate
- The hourly rate a professional firm bills a client. Unlike the labour cost rate it includes an allowance for overhead recovery and a required profit margin, so the charge-out rate is a billing figure, not the job's cost.
- Job costing vs job billing
- Job costing accumulates the actual cost of a client job (labour + applied overhead + disbursements); job billing charges the client using a charge-out rate or a cost-plus margin. The billing amount is not the cost.
Service Costing FAQ
Can AI help me with Service Costing?
Yes — ask Sia to walk through any Service Costing problem or concept step by step, the way Monash University tests it.
How do I know whether to use job, process or hybrid costing for a service?
Match the service to its archetype using contact time, customisation and volume. A high-contact, highly customised, low-volume service (legal, medical, consulting) is a professional service → job costing. A low-contact, standardised, high-volume service (airline check-in, utilities, post) is a mass service → process/averaging. Anything in the middle (banks, hotels, cafés) is a service shop → hybrid costing. State the two or three features you used to classify — that is where the discussion marks are.
Why are all service costs period costs?
Because a service is perishable and consumed as it is produced, there is no inventory to hold it in. Product (inventoriable) costs only exist when output can be stored until sold; with nothing to store there is no product-cost/period-cost timing split, no COGS line and no formal under/over-applied overhead adjustment for external reports. So in service costing every cost is expensed as a period cost — never build a manufacturing-style inventory schedule for a service firm.
What is the difference between job costing and the charge-out rate?
Job costing works out what a client job actually cost — professional labour, applied overhead and any disbursements. The charge-out rate is what the firm bills per professional-labour hour, and it already bundles an allowance for overhead recovery and a profit margin. So the charge-out (billing) rate is deliberately higher than the cost rate, and quoting it as the cost is a classic mark-loser.
Is a per-passenger or per-unit service cost a reliable figure?
Only roughly. It is an average that assumes every customer consumes resources equally, but most service costs are fixed capacity costs (depreciation, supervision, IT) that do not change with one more customer, and customers are not homogeneous (baggage, group processing, assistance). The average is fine for reporting, but misleading for a decision about a single extra customer, whose marginal cost is far lower. Saying this earns easy discussion marks.
How is Service Costing examined in ACC2200?
It usually appears in the closed-book final exam as part of a multi-part question that pairs a computation with a discussion — for example, compute a cost per service unit or a professional-firm job cost and fee (roughly 60% of the marks), then explain why the average is only a rough estimate or which billing basis a client prefers (roughly 40%). It is a short, high-yield topic because it recycles the job- and process-costing machinery from earlier weeks.
Studying with AI? Sia — free AI accounting tutor works through ACC2200 step by step.
Exam move
Service Costing is one of the cheapest mark-per-minute topics in ACC2200, so drill it right after job and process costing during the revision week — it reuses the same machinery with no inventory. First, practise the classify step until it is automatic: read a described service and, in one line, name the archetype (professional/service shop/mass) and the costing system (job/hybrid/process) with the customisation-and-volume features that justify it. Second, rebuild both computation types from a blank sheet — a professional-firm job cost with overhead applied on a labour base plus the cost-plus and charge-out fees, and a mass-service cost per unit = total period cost ÷ units. Third, and most important, rehearse the two discussion lines that carry ~40% of the marks: the per-unit figure is an average dominated by fixed capacity costs (reliable for reporting, not for a single-customer decision), and job costing (accumulate the cost) is not job billing (a charge-out rate that adds overhead and profit). Where you get stuck, ask Sia to generate a fresh service-costing question and explain each step.
