How are costs classified in management accounting - by behaviour as fixed or variable, by traceability as direct or indirect, and by element as materials, labour or overheads?
Classifying costs by behaviour (fixed, variable, semi-variable), by traceability (direct, indirect) and by element (materials, labour, overheads), and calculating total and unit cost.
A focused answer to the SQA National 5 Accounting content on classifying costs, covering cost behaviour (fixed, variable and semi-variable costs), traceability (direct and indirect costs), the three cost elements (materials, labour and overheads), and how to calculate total cost and cost per unit.
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What this dot point is asking
The SQA wants you to classify costs three ways - by behaviour (fixed, variable, semi-variable), by traceability (direct, indirect) and by element (materials, labour, overheads) - and to calculate total cost and cost per unit.
Why classify costs?
Management accounting helps managers plan and decide, and almost every decision needs to know how costs behave. Will costs rise if we make more? Which costs can we trace to a particular job? Sorting costs into clear types is the first step before break-even, budgeting or pricing.
Classifying by behaviour
This is the most important split for National 5. It describes how a cost changes as output (the number of units made) changes.
Note that total fixed cost stays the same while fixed cost per unit falls as more units are made (the same rent is spread over more units). Total variable cost rises with output, but variable cost per unit stays the same.
Classifying by traceability
This split asks whether a cost can be traced directly to one product or job.
- Direct costs can be traced to a single product: direct materials (the wood in a chair) and direct labour (the wage of the worker who makes it). Together they form the prime cost.
- Indirect costs (overheads) cannot be traced to one product and must be shared across all output: factory rent, supervisors' salaries, machine maintenance, factory lighting.
Classifying by element
Every cost is also one of three elements: materials (what the product is made from), labour (the people who make it) and overheads (all the other running costs). Each element can be direct or indirect - direct materials and indirect materials (such as glue or cleaning supplies) both exist.
How fixed cost per unit changes
Because fixed costs are spread over output, making more units lowers the fixed cost per unit, which is why higher production often lowers the cost per unit overall.
Examples in context
A bakery's flour and the wages of bakers paid per loaf are variable and direct; the oven's depreciation and the shop rent are fixed overheads. To quote a price for a large order, the manager works out the variable cost per loaf and adds a share of fixed overheads. Knowing which costs change with output, and which can be traced to a product, is the foundation for break-even and pricing - which is why this dot point comes first in the area.
Try this
Q1. Is factory rent a fixed or variable cost? [1 mark]
- Cue. Fixed - it does not change with output.
Q2. Direct materials are per unit and direct labour per unit. Find the prime cost per unit. [1 mark]
- Cue. .
Q3. Total cost is for 3000 units. Find the cost per unit. [2 marks]
- Cue. .
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA N5 style4 marksClassify each of these costs as fixed or variable for a furniture maker: factory rent, timber used, factory supervisor's salary, and wages paid per item produced.Show worked answer →
Factory rent is a fixed cost - it does not change with the number of items made (1 mark). Timber used is a variable cost - it rises and falls in direct proportion to output (1 mark). The factory supervisor's salary is a fixed cost - it is the same regardless of how many items are produced (1 mark). Wages paid per item produced (piece-rate wages) are a variable cost - total wages rise as more items are made (1 mark). Markers reward linking "fixed" to costs unchanged by output and "variable" to costs that change in proportion to output.
SQA N5 style4 marksA business makes 2000 units. Direct materials are 6 pounds per unit, direct labour is 4 pounds per unit, and fixed overheads are 8000 pounds. Calculate the total cost and the cost per unit.Show worked answer →
Total variable cost per unit , so total variable cost (1 mark). Add fixed overheads: total cost (1 mark). Cost per unit (1 mark for method, 1 mark for the answer). Markers reward adding the direct (variable) costs per unit, scaling by output, adding the fixed overhead, and dividing by units for the unit cost.
Related dot points
- Costing the three cost elements - materials, labour and overheads - including valuing materials issued, calculating labour cost from rates and hours, sharing overheads, and preparing a cost statement showing prime cost and total cost.
A focused answer to the SQA National 5 Accounting content on costing the three elements, covering valuing materials issued to production, calculating direct labour cost from hours and rates including overtime, sharing overheads across output, and building a cost statement that shows prime cost and total cost.
- Calculating contribution per unit, the break-even point in units and in sales revenue, the margin of safety, and the output required for a target profit, and interpreting a break-even chart.
A focused answer to the SQA National 5 Accounting content on break-even analysis, covering contribution per unit, the break-even point in units and in sales revenue, the margin of safety, the output needed for a target profit, and how to read a break-even chart.
- Preparing a cash budget showing forecast receipts and payments each month, the net cash flow, and the opening and closing bank balances, and interpreting it to manage cash flow.
A focused answer to the SQA National 5 Accounting content on cash budgets, covering how to forecast monthly receipts and payments, calculate the net cash flow, carry the closing bank balance forward to the next month, and interpret the budget to spot when the business may need finance.
- Using management accounting information (contribution, break-even and cost data) to make decisions such as accepting a special order, and the role of spreadsheets and IT in preparing and presenting accounting information.
A focused answer to the SQA National 5 Accounting content on decision-making and the use of IT, covering how contribution, break-even and cost information support decisions such as a special order or a make-or-buy choice, and the role of spreadsheets and information technology in preparing, presenting and updating accounting information.
- Preparing an income statement (trading, profit and loss account) for a sole trader, calculating cost of goods sold, gross profit, and profit for the year.
A focused answer to the SQA National 5 Accounting content on the income statement, covering the trading section that finds cost of goods sold and gross profit, the profit and loss section that deducts expenses and adds other income, and how the profit for the year is calculated for a sole trader.
Sources & how we know this
- National 5 Accounting Course Specification — SQA (2023)
- National 5 Accounting - course overview and resources — SQA (2023)