Breaking Down Overheads by Elements: Material, Labor, and Expenses

Every rupee a business spends does not go straight into the product sitting on a shelf. A biscuit factory buys flour and sugar for the biscuits themselves, but it also buys machine lubricant, pays a security guard’s monthly wage, and settles the electricity bill for the plant. None of these three costs can be traced to one particular packet of biscuits, yet the factory cannot run without any of them. Cost accountants group such costs together as overheads, and one of the simplest, most widely taught ways to organise them is by element: material, labour, and expenses. This grouping usually appears early in a cost accounting course because it mirrors the same three components used to build up the total cost of any product.

What overheads mean in cost accounting 🔗

Before splitting overheads into elements, it helps to be clear on what the term covers. In its study material on cost and management accounting, the Institute of Chartered Accountants of India classifies every cost, by nature or element, into six buckets: direct material, direct labour, direct expenses, indirect material, indirect labour, and indirect expenses. The first three together form the prime cost of a product. The last three, taken together, are what accountants call overheads.

So overheads are not a separate, mysterious category of spending. They are simply the indirect version of the same three elements, material, labour, and expenses, that cannot be conveniently traced to one specific unit, job, or product, yet are still necessary to run the business. Because the finished product’s cost cannot absorb these expenses directly, accountants apportion or allocate them across departments using a rational basis, such as floor area, machine hours, or the number of employees in each section.

Indirect materials: supplies that support production without becoming the product 🔗

Indirect materials are consumed during production or day-to-day operations, but they do not form part of the finished product, or their value per unit is too small to be worth tracking separately. Lubricating oil used to keep machines running, sandpaper used for finishing surfaces, cotton waste for wiping equipment, and small consumables used in negligible quantities all fall under this head.

Why these materials do not count as direct costs 🔗

The test is not whether the material physically touches the product, but whether tracking its exact quantity per unit is practical and worthwhile. Study notes from the Institute of Cost Accountants of India describe overheads as the aggregate of indirect material, indirect labour, and other expenses that cannot conveniently be charged directly to a specific cost unit. A tailor uses thread in every shirt, but measuring the exact length of thread consumed per shirt is not worth the accounting effort, so it is treated as an indirect material rather than a direct one, even though it technically ends up inside the finished garment.

Typical examples across departments include:

• Factory: lubricants, cleaning materials, consumable stores, small tools and spares
• Administration office: stationery, printer cartridges, cleaning supplies
• Selling and distribution: packing material used for dispatch, fuel for delivery vehicles

Indirect labour: everyone who keeps production running without working on it directly 🔗

Indirect labour refers to employees whose effort supports the production process but cannot be linked to a specific unit of output. A machine operator assembling a product is direct labour, since their time can be traced to what they produce. The supervisor overseeing five such operators, the maintenance technician who keeps their machines running, and the security guard at the factory gate are all indirect labour instead.

Roles typically classified as indirect labour 🔗

Supervisors, foremen, storekeepers, quality inspectors, cleaners, watchmen, and clerical staff in the works office are commonly cited examples. Their wages cannot be allocated to a single cost unit but can be apportioned across cost centres on an equitable basis, such as the number of workers supervised or the floor space each department occupies. This distinction matters for pricing decisions. If a business only charges customers for the direct labour on the shop floor and ignores the cost of supervisory and support staff, it will under-price its products and quietly erode its margins over time.

Indirect expenses: the category that keeps the lights on 🔗

Once indirect material and indirect labour are accounted for, everything else that cannot be directly traced to a specific product falls under indirect expenses. Rent for the factory building, property tax, insurance premiums, depreciation on plant and equipment, electricity and water charges, and repairs and maintenance are common examples. The classification of overheads by element treats this as something of a residual, catch-all group, precisely because indirect expenses do not share a single common thread the way materials or labour do.

Fixed and variable indirect expenses 🔗

Some indirect expenses stay roughly constant regardless of output, such as rent and insurance premiums. Others move with activity levels, such as power consumption in a factory running extra shifts during peak season. This fixed-versus-variable split is a separate classification, by behaviour rather than by element, but the two systems are usually applied together in practice. A single expense can be an indirect expense by element and a semi-variable cost by behaviour at the same time.

Putting the three elements together 🔗

A simple table makes the distinction easier to remember:

Add these three together and the result is total overheads. The Cost Accounting Standards Board of the Institute of Cost Accountants of India, in its standard on classification of costs, follows the same principle: the cost of indirect materials and indirect employees, together with other indirect expenses, forms overheads once these are pooled element by element.

Why bother classifying overheads by element 🔗

Element-wise classification is not just a textbook exercise. It gives a manager a quick answer to a practical question: where exactly is a rising indirect cost coming from? If total overheads climb by 10 percent in a quarter, that number alone says very little. Breaking the increase down by element shows whether it came from a spike in consumable material costs, an expansion of supervisory staff, or a jump in the electricity bill. Each of these calls for a different response, from renegotiating a supplier contract to reviewing staffing levels.

This classification also feeds directly into how a cost sheet is built. Once overheads are grouped by element, they still need to be apportioned to departments and then absorbed into product costs, usually through a predetermined overhead rate. The chapter on overheads in the Institute of Chartered Accountants of India’s study material walks through this exact sequence: collection, classification, allocation and apportionment, and finally absorption. Element-wise grouping is the starting point of that entire chain, and getting it right at this stage keeps the later steps accurate.

How element-wise classification connects to other classifications 🔗

Element-wise classification usually sits alongside function-wise classification, which groups overheads as factory, administration, selling, or distribution overheads, and behaviour-wise classification, which groups them as fixed, variable, or semi-variable. A single rupee spent on lubricating oil in the factory is, at the same time, an indirect material by element, a factory overhead by function, and typically a variable cost by behaviour. Learning to view the same cost through these different lenses is what makes cost accounting useful for decision-making rather than just record-keeping.

Common points of confusion 🔗

Small quantities of an otherwise direct material 🔗

Students often assume that if a material physically appears in the finished product, it must be a direct material. The thread-in-a-shirt or glue-in-a-book examples show this is not always true. Materiality, not physical presence, decides the classification. If tracking the cost per unit is not worth the effort, the item is treated as indirect.

Supervisors versus workers 🔗

Another frequent mix-up is treating all factory wages as direct labour. Only the wages of workers directly engaged in converting raw material into the finished product are direct. Anyone in a supporting role, however essential, is indirect labour, and their cost is apportioned rather than allocated.

Allocation versus apportionment 🔗

Allocation applies when a cost can be charged wholly to one cost centre, while apportionment applies when a cost is shared across several centres on a proportionate basis. Indirect materials and indirect labour tied to a single department can sometimes be allocated, but indirect expenses like rent almost always need apportionment, since one building typically houses multiple departments.

A quick example 🔗

Consider a garment manufacturing unit. The fabric and the tailor’s wages for stitching each shirt are direct costs, since both can be traced to a specific shirt. The thread used in stitching, though technically part of the shirt, is treated as an indirect material because tracking it per shirt is impractical. The floor supervisor who oversees twenty tailors is indirect labour. The rent paid for the stitching unit and the depreciation on sewing machines are indirect expenses. Add the three elements together, apportion them across the shirts produced in a period using a suitable base such as machine hours, and the result is the overhead cost per shirt, which gets added to the prime cost to arrive at the total cost of production.

What do you think? The next time you look at a product’s price tag, can you guess which portion might be recovering indirect material, indirect labour, and indirect expenses rather than the raw material itself? And in a business you know well, which of the three elements do you think would be hardest to bring down?

References

1. https://live.icai.org/bos/vcc/pdf/01042022_Dr__N_N__Sengupta_Ch-1_Introduction_to_CMA_1648787070.pdf
2. https://icmai.co.in/upload/Students/Syllabus-2012/Study_Material_New/Inter-Paper8-Revised.pdf
3. https://www.economicsdiscussion.net/cost-accounting/classification-of-overheads/31847
4. https://icmai.in/upload/CASB/ED/CAS-1-ED.pdf
5. https://resource.cdn.icai.org/66524bos53753-ip-m1.pdf