Difficulty: Introductory. No prerequisites beyond basic financial accounting literacy.
This is the opening chapter of management accounting, and it lays the vocabulary you will use for the entire course. Every later topic, from cost-volume-profit analysis to budgeting to relevant costing, assumes you can classify a cost correctly and explain why the classification matters. The core question is deceptively simple: "Where does this cost belong, and how does it behave?" If you can answer that for any cost a question throws at you, the rest of the course builds on solid ground. Students coming from financial accounting should note that management accounting is internally focused, less rule-bound than GAAP reporting, and concerned with helping managers make decisions rather than satisfying external stakeholders.
Costs are classified by traceability (direct vs. indirect), by function (manufacturing vs. non-manufacturing), by financial-statement treatment (product vs. period), and by behaviour (variable, fixed, mixed). Manufacturing costs include direct materials, direct labour, and manufacturing overhead. Product costs attach to inventory and hit the income statement as COGS when goods are sold; period costs (selling and administrative) are expensed immediately.
Direct cost
A cost that can be easily and conveniently traced to a specific cost object.
Think of it as: if you can point at a product and say "that cost exists because of this product," it is direct.
Indirect cost
A cost that cannot be easily and conveniently traced to a specific cost object.
In simple terms, the cost supports production but you cannot cleanly assign it to one product. Thread for jeans or ink for printed materials are classic examples: they feel direct, but tracking them per unit is impractical.
Common cost
A cost incurred in support of several cost objects simultaneously.
Think of it as: a shared resource. The CEO's salary supports every product line, so it is a common cost.
Cost object
Anything for which a separate measure of cost is desired: a product, a service, a department, a customer, a project.
Direct materials
The raw materials that become an integral, traceable part of the finished product.
In simple terms, if you can see the material in the final product (wood in a table, flour in bread), it is a direct material.
Indirect materials
Materials used in production that are not economically traceable to individual units. Cleaning supplies in a factory, sandpaper used on furniture. These are classified as manufacturing overhead.
Direct labour
Labour costs that can be easily traced to individual units of product. The wages of the worker assembling the product on the factory floor.
Indirect labour
Labour costs that support manufacturing but cannot be traced to individual units. Supervisors, janitorial staff, factory security. Classified as manufacturing overhead.
Manufacturing overhead
All manufacturing costs other than direct materials and direct labour. Includes indirect materials, indirect labour, depreciation on factory equipment, factory rent, factory utilities, and factory property taxes.
Think of it as: everything it takes to keep the factory running that is not a direct material or direct worker's wage.
Product costs (inventoriable costs / COGS)
Costs that attach to units of product: direct materials, direct labour, and manufacturing overhead. These are capitalised as inventory on the balance sheet and expensed as cost of goods sold when the product is sold.
In simple terms, product costs follow the product. They sit on the balance sheet as an asset until the product leaves the building.
Period costs (SG&A)
Costs that are expensed in the period in which they are incurred, regardless of sales activity. Selling expenses and administrative expenses.
Think of it as: if the cost has nothing to do with making the product, it is a period cost.
Selling costs
Costs incurred to secure customer orders and deliver the finished product. Advertising, sales commissions, shipping costs.
Administrative costs
Costs associated with the general management of the organisation, outside of manufacturing and selling. Executive salaries, legal fees, accounting department costs.
Matching principle (U.S. GAAP)
The principle that expenses should be recognised in the same period as the revenues they help generate. Costs with future revenue potential (unsold inventory) remain on the balance sheet as assets until the related revenue is earned.
Direct costs can be easily and conveniently traced to a cost object.
Indirect costs cannot be traced conveniently. They must be allocated.
Quick test: if you eliminate the cost object, does the cost disappear? If yes, it is probably direct.
A cost that supports several cost objects at once is called a common cost (e.g. a factory's property tax shared across all product lines).
Direct materials
Raw materials that become an integral part of the finished product and can be traced to it.
Raw materials that cannot be conveniently traced (cleaning supplies, sandpaper, glue) become indirect materials, classified under manufacturing overhead.
Direct labour
Wages of workers whose effort is traceable to individual units.
Supervisors, maintenance staff, and janitorial workers are indirect labour, classified under manufacturing overhead.
Manufacturing overhead
The catch-all for every manufacturing cost that is neither direct materials nor direct labour.
Includes: indirect materials, indirect labour, factory depreciation, factory rent, factory utilities, factory insurance, factory property taxes.
Selling costs: costs to secure and fulfil customer orders (advertising, sales salaries, commissions, shipping).
Administrative costs: costs of general management unrelated to manufacturing or selling (executive salaries, accounting, legal, HR).
Product costs (direct materials + direct labour + manufacturing overhead):
Capitalised to inventory on the balance sheet when incurred.
Expensed as cost of goods sold (COGS) on the income statement when the product is sold.
The matching principle drives this: the cost is matched to the revenue it generates.
Period costs (selling + administrative expenses, collectively SG&A):
Expensed on the income statement in the period they are incurred.
They never sit on the balance sheet as inventory.
Product costs move through three inventory accounts on the balance sheet before reaching the income statement:
Raw materials inventory: holds purchased materials awaiting use.
Work-in-process (WIP) inventory: holds partially completed goods. Direct materials used, direct labour applied, and manufacturing overhead allocated all flow into WIP.
Finished goods inventory: holds completed products awaiting sale.
When goods are sold, their cost moves from finished goods inventory to cost of goods sold on the income statement.
Period costs bypass the balance sheet entirely and go straight to the income statement as selling and administrative expenses.
A car manufacturer classifies steel and tyres as direct materials, assembly-line wages as direct labour, and factory electricity as manufacturing overhead. These product costs stay on the balance sheet as inventory until a car sells, at which point they become COGS. The marketing campaign for a new model, by contrast, is a period cost, expensed the moment it runs, regardless of how many cars sell that month.
This classification matters outside exams too. Managers use it to decide product pricing, evaluate profitability by product line, and identify where to cut costs without hurting production.
"All materials used in a factory are direct materials." They are not. Cleaning supplies, lubricants, and small consumables like sandpaper are indirect materials and go into manufacturing overhead.
"Overhead is a non-manufacturing cost." Manufacturing overhead is a manufacturing cost. The word "overhead" alone can be misleading because administrative overhead exists too, but in this course, manufacturing overhead is part of product cost.
"Period costs include depreciation on factory equipment." Factory depreciation is manufacturing overhead (a product cost). Only depreciation on non-manufacturing assets (office buildings, delivery vehicles) could be a period cost.
"Product costs are expensed when incurred." Product costs are capitalised first (added to inventory) and expensed only when the goods are sold. This is the entire point of the matching principle.
Cost classification is tested heavily because it underpins every later chapter. Expect questions that give you a list of costs and ask you to sort them.
Classifying a cost as direct vs. indirect, product vs. period, or manufacturing vs. non-manufacturing is a near-certain exam item.
Questions frequently test whether you know that manufacturing overhead is a product cost, not a period cost.
The flow of product costs through the three inventory accounts (raw materials, WIP, finished goods) to COGS is a favourite for both multiple-choice and short-answer formats.
The matching principle and its role in determining when product costs become expenses is a conceptual question that appears regularly.
True or false: factory rent is a period cost. (False. Factory rent is manufacturing overhead, which is a product cost.)
Fill in the blank: the three manufacturing cost categories are direct materials, direct labour, and __________. (Manufacturing overhead.)
True or false: product costs are expensed in the period they are incurred. (False. They are capitalised to inventory first, then expensed as COGS when sold.)
Fill in the blank: costs that support several cost objects simultaneously are called __________ costs. (Common costs.)
True or false: a sales representative's commission is a product cost. (False. It is a selling cost, which is a period cost.)
Q: A furniture manufacturer uses glue in assembling tables. Is the glue a direct material or an indirect material? Why?
A: Indirect material. Although glue physically becomes part of the table, it cannot be conveniently traced to individual units. It is classified as manufacturing overhead.
Q: Where do product costs appear on the financial statements before the goods are sold?
A: On the balance sheet, as inventory (raw materials, work-in-process, or finished goods).
Q: A company pays its factory supervisor a salary of $85,000 per year. Is this a product cost or a period cost? Is it direct or indirect?
A: Product cost (it is incurred in the factory, so it is a manufacturing cost). It is indirect labour because the supervisor's time cannot be traced to individual units. It is classified as manufacturing overhead.
Q: Explain why advertising expense is a period cost rather than a product cost.
A: Advertising is a selling cost. It is not part of manufacturing the product, so it does not attach to inventory. Under the matching principle, it is expensed in the period incurred rather than capitalised.
Q: A company manufactures bicycles. Classify each of the following: (a) steel tubing, (b) assembly worker wages, (c) factory electricity, (d) CEO salary, (e) sales commissions.
A: (a) Direct materials. (b) Direct labour. (c) Manufacturing overhead (product cost). (d) Administrative cost (period cost). (e) Selling cost (period cost).
This material connects directly to cost behaviour (Chapter 1, Part 2), where you will learn how costs change with activity levels. Understanding which costs are variable, fixed, or mixed builds on knowing what category a cost falls into. It also sets up the contribution-format income statement, which rearranges costs by behaviour rather than function.
Later in the course, product vs. period cost classification becomes critical for job-order costing and process costing, where you will track product costs through inventory accounts in detail.
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