Study guide
2.3 Costing Methods: Job, Batch, Unit, and Service Costing
AAT Level 3 Diploma in Accounting - Management Accounting Techniques MATS
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1 Chapter 1: Purpose and Use of Management Accounting
1.1 Role and Scope of Management Accounting 1.2 Cost Classification and Responsibility Accounting 1.3 Information Needs and Management Reporting
2 Chapter 2: Techniques for Dealing with Costs
2.1 Cost Behaviour Patterns 2.2 High-Low Method and Cost Estimation 2.3 Costing Methods: Job, Batch, Unit, and Service Costing 2.4 Cost Accounting Records and Journals
3 Chapter 3: Attributing Costs to Organisational Requirements
3.1 Material Costs and Inventory Valuation 3.2 Labour Costing and Remuneration Systems 3.3 Overhead Allocation, Apportionment, and Reapportionment 3.4 Overhead Absorption and Activity-Based Costing
4 Chapter 4: Investigating Deviations from Budgets - Variance Analysis
4.1 Standard Costing and Flexible Budgets 4.2 Direct Material and Direct Labour Variances 4.3 Overhead and Sales Variances 4.4 Reconciliation Operating Statements and Variance Interpretation
5 Chapter 5: Spreadsheet Techniques
5.1 Spreadsheet Design Principles and Data Integrity 5.2 Essential Spreadsheet Functions for Accounting 5.3 Data Analysis, Formatting, and Security
6 Chapter 6: Short-Term Decision Making
6.1 Marginal vs Absorption Costing 6.2 Cost-Volume-Profit (CVP) and Break-Even Analysis 6.3 Relevant Costing and Non-Routine Decisions 6.4 Limiting Factor Analysis and Make-or-Buy Decisions
7 Chapter 7: Principles of Cash Management
7.1 Cash vs Profit and Cash Flow Forecasting 7.2 Working Capital Cycle and Cash Control 7.3 Liquidity, Treasury, and Financing Options
2.3 Costing Methods: Job, Batch, Unit, and Service Costing
Key Takeaways Explain This Topic AI
Job costing accumulates costs for unique, customized customer orders using a job cost card to record direct costs and absorbed overheads.
Batch costing applies to identical items manufactured in discrete groups, calculating unit cost by dividing total batch costs (including setup costs) by good output volume.
Unit costing is used for continuous, high-volume identical output: cost per unit equals net production cost (after any scrap credit for expected waste) divided by good output volume.
Equivalent units convert partially completed work-in-progress (WIP) into fully completed equivalents so period costs can be split fairly between finished output and closing WIP.
Service costing measures intangible output using composite cost units such as cost per tonne-mile, cost per patient-day, or cost per chargeable hour.
Last updated: August 2026
Costing Methods: Job, Batch, Unit, and Service Costing
Businesses utilize different costing systems depending on how products or services are manufactured and delivered. The AAT Q2022 MATS syllabus (topic 2.5) requires candidates to record cost information using four costing systems — Job Costing , Batch Costing , Unit Costing , and Service Costing — to understand the appropriate choice of system for different business sectors, and to appreciate the effect of waste on costing inputs and outputs.
Syllabus note : Detailed process costing (process accounts with normal and abnormal losses) and LIFO inventory valuation belonged to the previous AQ2016 syllabus and were removed under Q2022 — they are not assessed in MATS. Continuous, high-volume production is costed in Q2022 MATS using unit costing with cost-per-equivalent-unit calculations, covered below.
1. Job Costing
Job costing is applied when work is undertaken to a customer's specific, bespoke requirements. Each job is unique, short in duration, and separately identifiable.
Typical Applications : Custom furniture manufacturing, commercial printing, building repair work, advertising campaigns, bespoke auditing engagements, and specialist vehicle conversion.
The Job Cost Card
A Job Cost Card (or job account) is opened for every specific order to collect and track incurred expenditure:
Direct Materials : Identified from material requisition notes specifically coded to the job number.
Direct Labour : Identified from employee job time tickets or electronic time-card entries.
Direct Expenses : Specific costs incurred solely for that job (e.g., hire of specialist equipment, architectural fees, or design licenses).
Prime Cost : The sum of all direct costs ( Prime Cost = Direct Materials + Direct Labour + Direct Expenses \text{Prime Cost} = \text{Direct Materials} + \text{Direct Labour} + \text{Direct Expenses} Prime Cost = Direct Materials + Direct Labour + Direct Expenses ).
Absorbed Production Overheads : Applied using a pre-determined Overhead Absorption Rate (OAR) based on direct labour hours, machine hours, or direct labour cost.
Total Production Cost : Prime Cost + Absorbed Production Overheads.
Non-Production Overheads & Profit Margin : Selling, distribution, and administration overheads are added, followed by the target profit mark-up (percentage added to cost) or profit margin (percentage of selling price) to establish the final customer quote or invoice price.
2. Batch Costing
Batch costing is a variation of job costing applied when a group of identical items are manufactured together in a discrete production run (a batch).
Typical Applications : Bakeries producing 500 loaves of artisan bread, pharmaceutical firms manufacturing 20,000 antibiotic tablets, clothing factories producing 300 pairs of trousers, and component manufacturing.
Calculating Cost per Unit in a Batch
Costs are collected for the batch as a whole on a batch cost card in the same manner as a job. A key element unique to batch costing is Batch Setup Costs (the cost of cleaning, retooling, and calibrating machinery prior to running the batch).
To calculate the cost per individual finished unit within a batch: Cost per Unit in Batch = Total Batch Direct Costs + Batch Setup Costs + Absorbed Overheads Number of Good Units Produced in Batch \text{Cost per Unit in Batch} = \frac{\text{Total Batch Direct Costs} + \text{Batch Setup Costs} + \text{Absorbed Overheads}}{\text{Number of Good Units Produced in Batch}} Cost per Unit in Batch = Number of Good Units Produced in Batch Total Batch Direct Costs + Batch Setup Costs + Absorbed Overheads
3. Unit Costing
Unit costing (sometimes called single or output costing) is applied when identical units are produced continuously or in very large volumes, so that no individual job or batch can be separately identified.
Typical Applications : Cement manufacture, industrial chemicals, brewing and soft-drink bottling, paper production, quarrying, and utility generation.
Cost per Unit of Good Output
Because every unit is identical, the unit cost is found by dividing the total production cost of the period by the number of good units produced: Cost per Unit = Total Production Cost of Period Units of Good Output Produced \text{Cost per Unit} = \frac{\text{Total Production Cost of Period}}{\text{Units of Good Output Produced}} Cost per Unit = Units of Good Output Produced Total Production Cost of Period
The Effect of Waste on Costing Inputs and Outputs
Continuous production often involves expected (normal) waste — shrinkage, evaporation, or off-cuts inherent in efficient operations. Waste reduces the good output over which period costs are spread, so it raises the cost per good unit :
Expected waste is assigned no production cost ; its cost is borne by the good output.
If the expected waste can be sold as scrap , the scrap proceeds are deducted from total input costs before calculating the unit cost.
Waste in excess of the expected level is an inefficiency cost: it is valued at the full cost per good unit and written off as a period expense , never absorbed into the cost of good output.
Cost per Equivalent Unit (Work-in-Progress)
At a period end, some units may be only partly complete. To state partially finished work-in-progress (WIP) in terms of finished production, MATS candidates calculate equivalent units : Equivalent Units = Physical Units in WIP × Percentage Completion \text{Equivalent Units} = \text{Physical Units in WIP} \times \text{Percentage Completion} Equivalent Units = Physical Units in WIP × Percentage Completion Cost per Equivalent Unit = Total Costs to Allocate Completed Units + Equivalent Units in Closing WIP \text{Cost per Equivalent Unit} = \frac{\text{Total Costs to Allocate}}{\text{Completed Units} + \text{Equivalent Units in Closing WIP}} Cost per Equivalent Unit = Completed Units + Equivalent Units in Closing WIP Total Costs to Allocate
Example : 1,000 units in closing WIP that are 60% complete equal 600 equivalent units of finished production.
4. Service Costing
Service costing is used by organizations that deliver intangible services rather than manufacturing tangible goods.
Typical Applications : Hospitals, hotels, road haulage and courier firms, airlines and rail operators, colleges, accountancy and law practices, and IT support providers.
Composite Cost Units
Services cannot be held in inventory, and most of their costs are overheads rather than direct materials. Costs are therefore measured using a composite cost unit that combines two dimensions of service output:
- Service Sector Composite Cost Unit
- Road haulage / freight Cost per tonne-mile (or tonne-km) carried
- Passenger transport Cost per passenger-mile
- Hospitals Cost per patient-day
- Hotels Cost per room-night occupied
- Professional firms Cost per chargeable (billable) hour
Education Cost per student / course Cost per Service Unit = Total Service Costs for the Period Number of Service Units Supplied \text{Cost per Service Unit} = \frac{\text{Total Service Costs for the Period}}{\text{Number of Service Units Supplied}} Cost per Service Unit = Number of Service Units Supplied Total Service Costs for the Period
- Worked Numerical Examples
- Worked Example 1: Comprehensive Job Cost Card & Pricing
Scenario : Apex Design Ltd receives Job #J-805 for a custom timber display unit. The job records show:
- Direct Materials: £2,400
- Direct Labour: 80 hours @ £18 per hour = £1,440
- Direct Expenses (specialist router hire): £360
- Production Overhead Absorption Rate: £25 per direct labour hour
- Administration & Selling Overheads: 15% of total production cost
- Target Profit Margin: 20% on selling price
Step-by-Step Job Costing Calculation:
Calculate Prime Cost : Prime Cost = £ 2 , 400 + £ 1 , 440 + £ 360 = £ 4 , 200 \text{Prime Cost} = £2,400 + £1,440 + £360 = £4,200 Prime Cost = £2 , 400 + £1 , 440 + £360 = £4 , 200
Calculate Absorbed Production Overheads : Absorbed Overheads = 80 labour hours × £ 25 = £ 2 , 000 \text{Absorbed Overheads} = 80\text{ labour hours} \times £25 = £2,000 Absorbed Overheads = 80 labour hours × £25 = £2 , 000
Calculate Total Production Cost : Total Production Cost = £ 4 , 200 + £ 2 , 000 = £ 6 , 200 \text{Total Production Cost} = £4,200 + £2,000 = £6,200 Total Production Cost = £4 , 200 + £2 , 000 = £6 , 200
Add Administration & Selling Overheads : Admin/Selling Overheads = 15 % × £ 6 , 200 = £ 930 \text{Admin/Selling Overheads} = 15\% \times £6,200 = £930 Admin/Selling Overheads = 15% × £6 , 200 = £930 Total Cost of Job = £ 6 , 200 + £ 930 = £ 7 , 130 \text{Total Cost of Job} = £6,200 + £930 = £7,130 Total Cost of Job = £6 , 200 + £930 = £7 , 130
Calculate Selling Price using 20% Profit Margin : Selling Price = Total Cost 1 − Profit Margin = £ 7 , 130 1 − 0.20 = £ 7 , 130 0.80 = £ 8 , 912.50 \text{Selling Price} = \frac{\text{Total Cost}}{1 - \text{Profit Margin}} = \frac{£7,130}{1 - 0.20} = \frac{£7,130}{0.80} = £8,912.50 Selling Price = 1 − Profit Margin Total Cost = 1 − 0.20 £7 , 130 = 0.80 £7 , 130 = £8 , 912.50 Profit Amount = £ 8 , 912.50 − £ 7 , 130 = £ 1 , 782.50 \text{Profit Amount} = £8,912.50 - £7,130 = £1,782.50 Profit Amount = £8 , 912.50 − £7 , 130 = £1 , 782.50
Worked Example 2: Unit Costing with Waste
Scenario : SynthChem Ltd produces a single identical industrial chemical in continuous output. During March, the following data was recorded:
- Input Materials: 5,000 kg @ £5.00/kg = £25,000
- Conversion Costs (Direct Labour & Overheads): £19,000
- Total Input Cost: £44,000
Expected waste: 20% of input volume (1,000 kg), which can be sold for scrap value of £4.00 per kg .
Actual good output transferred to finished goods: 3,800 kg . Actual total waste: 1,200 kg (comprising 1,000 kg expected waste and 200 kg unexpected excess waste).
Step-by-Step Unit Costing Calculation:
Calculate Expected Waste & Scrap Credit : Expected Waste = 20 % × 5 , 000 kg = 1 , 000 kg \text{Expected Waste} = 20\% \times 5,000\text{ kg} = 1,000\text{ kg} Expected Waste = 20% × 5 , 000 kg = 1 , 000 kg Scrap Value Credit = 1 , 000 kg × £ 4.00 = £ 4 , 000 \text{Scrap Value Credit} = 1,000\text{ kg} \times \pounds 4.00 = \pounds 4,000 Scrap Value Credit = 1 , 000 kg × £4.00 = £4 , 000
Calculate Net Cost of Production & Expected Good Output : Net Production Cost = Total Inputs − Scrap Credit = £ 44 , 000 − £ 4 , 000 = £ 40 , 000 \text{Net Production Cost} = \text{Total Inputs} - \text{Scrap Credit} = \pounds 44,000 - \pounds 4,000 = \pounds 40,000 Net Production Cost = Total Inputs − Scrap Credit = £44 , 000 − £4 , 000 = £40 , 000 Expected Good Output = 5 , 000 kg − 1 , 000 kg = 4 , 000 kg \text{Expected Good Output} = 5,000\text{ kg} - 1,000\text{ kg} = 4,000\text{ kg} Expected Good Output = 5 , 000 kg − 1 , 000 kg = 4 , 000 kg
Calculate Cost per kg of Good Output : Cost per kg = Net Production Cost Expected Good Output = £ 40 , 000 4 , 000 kg = £ 10.00 per kg \text{Cost per kg} = \frac{\text{Net Production Cost}}{\text{Expected Good Output}} = \frac{\pounds 40,000}{4,000\text{ kg}} = \pounds 10.00\text{ per kg} Cost per kg = Expected Good Output Net Production Cost = 4 , 000 kg £40 , 000 = £10.00 per kg
Value the Outputs :
Finished Goods (3,800 kg) : 3 , 800 kg × £ 10.00 = £ 38 , 000 3,800\text{ kg} \times \pounds 10.00 = \mathbf{\pounds 38,000} 3 , 800 kg × £10.00 = £38 , 000
Unexpected Excess Waste (200 kg) : 200 kg × £ 10.00 = £ 2 , 000 200\text{ kg} \times \pounds 10.00 = \mathbf{\pounds 2,000} 200 kg × £10.00 = £2 , 000 (written off as a period expense — an inefficiency cost, NOT absorbed into good output)
Expected Waste Scrap (1,000 kg) : 1 , 000 kg × £ 4.00 = £ 4 , 000 1,000\text{ kg} \times \pounds 4.00 = \mathbf{\pounds 4,000} 1 , 000 kg × £4.00 = £4 , 000 (scrap revenue already credited against input costs)
Worked Example 3: Cost per Equivalent Unit (Closing WIP)
Scenario : At the end of April, SynthChem Ltd has £46,000 of production costs to allocate. Completed production is 4,000 units, and closing work-in-progress is 1,000 units that are 60% complete.
Equivalent Units in Closing WIP : 1 , 000 units × 60 % = 600 equivalent units 1,000\text{ units} \times 60\% = \mathbf{600\text{ equivalent units}} 1 , 000 units × 60% = 600 equivalent units
Cost per Equivalent Unit : £ 46 , 000 4 , 000 + 600 = £ 46 , 000 4 , 600 = £ 10.00 \frac{\pounds 46,000}{4,000 + 600} = \frac{\pounds 46,000}{4,600} = \mathbf{\pounds 10.00} 4 , 000 + 600 £46 , 000 = 4 , 600 £46 , 000 = £10.00
Cost Allocation :
Completed output: 4 , 000 × £ 10.00 = £ 40 , 000 4,000 \times \pounds 10.00 = \mathbf{\pounds 40,000} 4 , 000 × £10.00 = £40 , 000
Closing WIP: 600 × £ 10.00 = £ 6 , 000 600 \times \pounds 10.00 = \mathbf{\pounds 6,000} 600 × £10.00 = £6 , 000
Worked Example 4: Service Costing with a Composite Cost Unit
Scenario : Apex Haulage Ltd operates a small freight fleet. Total operating costs for the quarter are £540,000, and the fleet carries loads totaling 900,000 tonne-miles. Cost per Tonne-Mile = £ 540 , 000 900 , 000 tonne-miles = £ 0.60 per tonne-mile \text{Cost per Tonne-Mile} = \frac{\pounds 540,000}{900,000\text{ tonne-miles}} = \mathbf{\pounds 0.60\text{ per tonne-mile}} Cost per Tonne-Mile = 900 , 000 tonne-miles £540 , 000 = £0.60 per tonne-mile
Management uses this composite unit cost to quote freight rates and to monitor fleet efficiency between periods.
Choosing the Appropriate Costing System (AAT topic 2.5.1)
- Business / Sector Appropriate Costing System
- Bespoke, customer-specific work (printer, builder, vehicle converter) Job costing
- Identical items produced in discrete groups (bakery, pharmaceuticals, clothing) Batch costing
- Continuous, high-volume identical output (cement, chemicals, drinks bottling) Unit costing
- Intangible services (hospital, hotel, haulage, consultancy) Service costing
- Common AAT Exam Traps
Exam Trap 1: Confusing Profit Mark-up with Profit Margin : Mark-up is % added to Cost (Price = Cost x (1 + %)); Margin is % of Selling Price (Price = Cost / (1 - %)).
Exam Trap 2: Selecting the Wrong Costing System for the Sector : Match the system to the output pattern — bespoke orders need job costing, discrete groups need batch costing, continuous identical output needs unit costing, and intangible services need service costing with a composite cost unit.
Exam Trap 3: Forgetting the Scrap Credit for Expected Waste : Always deduct scrap proceeds from total input costs before deriving the cost per good unit; waste beyond the expected level is a period expense, never part of the good-unit cost.