ACCA Applied Knowledge · Management Accounting
Cost Accounting Methods for ACCA Management Accounting
Cost accounting methods are the systems used to work out the cost of a unit of output. Job and batch costing suit custom or grouped work. Process costing suits continuous output. Joint product and service costing handle shared costs and intangible outputs. Solve each by finding total cost, then dividing by the right measure of output.
What this chapter covers
This chapter covers the main ways a business collects costs and attaches them to what it sells. The method you use depends on how the work is done. A one-off order uses job costing. A group of identical items made together uses batch costing. A continuous flow through several stages uses process costing. Linked outputs from one process use joint product and by-product rules. Businesses that sell a service use service costing.
The core idea is the same each time: add up the costs, then divide by a sensible measure of output. What changes is the measure. It may be a job, a batch, an equivalent unit, a sales value or a cost unit such as a passenger-kilometre. Process costing is the heaviest part, because losses, gains and unfinished work all change the output figure.
This chapter links to the rest of the MA paper. It builds on cost classification and absorption costing, which give you the overheads and rates you apply to jobs. It also feeds standard costing, budgeting and performance measurement, where unit costs become standards and benchmarks. In Section A you will see these as short calculation questions. Section B questions on budgeting and standard costing rely on unit cost skills you build here.
Cost accounting methods produce many short, calculation-based objective test questions, and each one is worth two marks in Section A. The questions are predictable in form, so careful practice turns them into reliable marks. Process costing is where most students lose time, but the steps never change. If you learn them well, you gain speed that helps you across the whole two-hour exam. The unit costs you learn to find here also support later work on standard costing and performance measurement.
Cost accounting methods: topics in the order to study them
- 1Job CostingStart here because it is the simplest method: collect costs for one job, add overheads and a profit margin or markup.
- 2Batch CostingIt builds directly on job costing, with one extra step of dividing the batch cost by the number of units.
- 3Process Costing: Losses and GainsThis introduces continuous production, normal and abnormal losses, and abnormal gains, which you need before handling unfinished work.
- 4Equivalent Units and Work-in-ProgressLearn this after losses, because it adds opening and closing work-in-progress to the same process account layout.
- 5Joint Products and By-ProductsIt follows process costing because joint costs arise at a split-off point in a process, and you need to apportion them.
- 6Service CostingFinish with this as it applies the same cost-per-unit idea to services, using composite cost units.
How to prepare Cost accounting methods
Aim to be quick and accurate on calculations. Learn the layout of each method, then practise until the steps are automatic.
- Learn the purpose of each method and the type of business that uses it. Many questions simply ask you to pick the right method.
- Work through job and batch costing with a cost card: materials, labour, overheads, then total, markup and selling price.
- For process costing, always set up the same four columns: input units, output units, costs, and the values. Work out normal loss before anything else.
- Practise losses and gains first without work-in-progress. Only add equivalent units once the loss steps feel easy.
- For equivalent units, learn the steps: units flow, equivalent units for each cost element, cost per equivalent unit, then values. Know the FIFO and AVCO differences as the syllabus requires.
- Practise joint product apportionment by physical units and by sales value at split-off, and treat by-product income as a deduction from cost or as other income as the question states.
- Finish with timed objective test sets on mixed questions. Practise multiple choice, multiple response and number entry, and check the units and decimals the question asks for.
Common mistakes in Cost accounting methods
Ignoring the scrap value of normal loss when calculating cost per unit.
Fix: Write the formula every time: (costs - scrap value of normal loss) ÷ expected good units. Check for scrap before you divide.
Counting abnormal loss or gain in the normal loss figure.
Fix: Normal loss is a percentage of input, unless the question says otherwise. Compare the actual output with the expected output to find the abnormal item.
Using the wrong completion percentage for materials and conversion costs in work-in-progress.
Fix: Work out equivalent units separately for each cost element, using the percentage given for each.
Apportioning joint costs using sales value after split-off instead of at split-off.
Fix: Read the basis named in the question. If you need the sales value at split-off and only the final value is given, deduct the further processing costs.
Choosing the wrong cost unit in service costing.
Fix: Combine the two measures if the question asks for it, for example passengers × kilometres, then divide total cost by that figure.
Rounding too early or giving the wrong format in number entry questions.
Fix: Keep full figures in your calculator until the end, then round as the question instructs.
Last-day revision: Cost accounting methods
- Job costing: total job cost = direct materials + direct labour + direct expenses + absorbed overheads.
- Batch costing: cost per unit = total batch cost ÷ units in the batch.
- Normal loss is expected and is usually valued at scrap value or nil; its cost is borne by good units.
- Abnormal loss is valued at the same cost per unit as good output and the loss is charged to the income statement.
- Abnormal gain is valued like good output and the gain is a credit to the income statement.
- Cost per unit in a process = (input costs - scrap value of normal loss) ÷ (input units - normal loss units).
- Equivalent units = physical units × percentage completion for each cost element.
- Materials are often added at the start so closing work-in-progress is 100% complete for materials; conversion costs are often partly complete.
- Joint costs are shared at the split-off point; later costs belong to the individual product.
- Apportioning joint costs by sales value at split-off gives each product the same gross profit percentage only when there are no further processing costs.
- Service costing uses a composite cost unit, such as cost per passenger-kilometre or per bed-night.
- Check what the question asks for: total cost, unit cost, value or percentage, and give the answer in the stated units.
Cost accounting methods practice questions
- Which of the following is the most likely characteristic of a service organisation that makes service costing more difficult than product co…
- Which statement about abnormal loss in process costing is correct?
- A job is to be priced to earn a profit margin of 25% on selling price. Total cost of the job is $9,000. What selling price should be quoted?
- A firm of accountants charges clients on the basis of chargeable hours. Staff cost $90,000 for 2,000 available hours, of which 75% are charg…
- Setting up a machine for each batch costs $900 regardless of batch size. Other variable cost is $4 per unit. Which of the following gives th…
- Job 207 used direct materials of $4,200 and 150 direct labour hours at $12 per hour. Production overheads are absorbed at $8 per direct labo…
- A company uses the FIFO method in a process. Opening work-in-progress was 1,000 units, 60% complete for conversion. 7,000 units were started…
- A firm produces a product in batches. Set-up cost is $1,200 per batch and other costs are $6 per unit. If the batch size is increased from 2…
Cost accounting methods in other exams
The same ground in other exams, if you are preparing for more than one or want another angle on it.
Cost accounting methods: frequently asked questions
Which cost accounting method is the hardest in ACCA MA?
Most students find process costing with work-in-progress the hardest, because it has many steps. The steps are the same every time. Practise with a fixed layout and the method becomes routine.
What is the difference between job costing and batch costing?
Job costing finds the cost of a single customer order. Batch costing finds the cost of a group of identical items made together, then divides by the number of units. Both collect costs the same way.
How is abnormal loss treated in process costing?
Abnormal loss is valued at the same cost per unit as good output, less any scrap value it earns. It is then charged to the income statement as a cost of the period, not left in the cost of good units.
How do I deal with by-products in the exam?
Read how the question wants the income treated. The usual options are to deduct the by-product's net sales value from the cost of the main process, or to treat it as other income. Apply that treatment before calculating the cost of the main products.