Exploring Different Methods of Costing for Various Industries

Walk into a bakery, a shipyard, and a mobile phone factory, and you will find three completely different ways of answering the same question: what does it cost to make this? A bakery baking 500 identical cookies does not need the same costing approach as a shipyard building a single vessel over three years. This is exactly why cost accounting offers multiple methods of costing rather than one universal formula. Each method is built around how a specific industry actually produces its goods or services, so the cost figures it produces are meaningful and usable for pricing, budgeting, and control.

Why one costing method doesn’t fit all industries 🔗

The method a business chooses depends largely on its production pattern. Is the output made to a customer’s specific order, or is it manufactured continuously in bulk? Does production happen in one operation, or does it pass through several distinct stages? Is the business even making a physical product, or is it delivering a service? Once you answer these questions, the right costing method tends to become obvious. Broadly, costing methods fall into two families: specific order costing, used where each unit of output is distinct, and operation or process costing, used where output is continuous and uniform, as explained in a comparative note on job, process, and contract costing prepared for commerce postgraduate exams. Let’s look at each method individually.

Job costing: costing each order separately 🔗

Job costing is used when a business executes work against a specific customer order, and every order is different from the next. According to the Institute of Chartered Accountants of India, this method applies wherever production consists of separate jobs, each authorised by a distinct order or contract, with material, labour, and overhead costs collected against that particular job individually. A printing press is a classic example: one order might be wedding invitations, the next could be office letterheads, and a third might be product packaging. Each job carries its own material list, labour hours, and machine time, so the press can calculate exactly what each order cost and price it accordingly.

Where job costing works best 🔗

Industries using job costing typically include furniture making, machine tool manufacturing, interior decoration, ship repairs, and specialised printing. The common thread is customisation. Because every job is tracked separately, businesses get a clear picture of which orders are profitable and which are not, allowing for far better pricing decisions on future quotations. The tradeoff is that job costing demands detailed record-keeping, since costs must be captured job by job rather than averaged across production.

Contract costing: costing large, long-term projects 🔗

Contract costing is essentially job costing scaled up for big, long-duration projects, most commonly seen in construction and civil engineering. Think of a company building a flyover or a residential tower; the project might run for two or three years, so costs cannot simply be tallied once at the end. Instead, cost accounting has to work in stages. Periodically, an independent architect or surveyor inspects the work and issues a certificate confirming how much of the contract has actually been completed and to what value, a process explained in detail in a note on contract costing fundamentals. This certified value is what allows the contractor to raise interim bills rather than wait for the whole project to finish.

Retention money and work certified 🔗

Two terms are unique to contract costing. Retention money is a portion of the certified value that the client deliberately withholds as security, releasing it only after the project is completed satisfactorily and any defect liability period has passed. Cost of work uncertified refers to work the contractor has completed but which has not yet been inspected and approved by the architect. Together, these mechanisms protect the client against poor workmanship while still letting the contractor receive steady cash flow through the life of a lengthy project.

Batch costing: costing groups of identical units 🔗

Batch costing sits between job costing and mass production. Instead of costing a single unit or a single customer order, a business groups identical items into a batch, treats that whole batch as one cost unit, and then divides the total batch cost by the number of items produced to arrive at a per-unit cost. This is the standard approach in pharmaceutical manufacturing, biscuit and confectionery production, and component manufacturing where parts are made in fixed lot sizes before being stored or assembled. A pharmaceutical company producing a batch of 10,000 tablets, for instance, will cost the entire production run together rather than trying to isolate the cost of a single tablet during manufacturing.

The key management decision in batch costing is determining the economic batch quantity, since batches that are too small increase the proportion of setup costs per unit, while batches that are too large tie up working capital in unsold or unused stock.

Unit or output costing: costing continuous, single-product production 🔗

Unit costing, also called output costing or single costing, applies where a business manufactures just one product, or a few grades of the same product, continuously and in bulk. Because every unit produced is essentially identical, there is no need to track individual jobs or batches separately. A note from a commerce college describes it as the method used to ascertain the cost per unit of output by dividing total production cost by the total number of units produced during a period. Cement plants, brick kilns, sugar mills, and paper mills are typical users of this method.

Unit costing serves several purposes beyond just knowing the cost per unit. It helps businesses compare costs across accounting periods to judge efficiency, supports the preparation of price quotations and tenders, and provides a benchmark for cost control. A concise explainer on single costing objectives notes that comparing actual costs against a predetermined standard is one of the method’s core control functions.

Process costing: costing production through distinct stages 🔗

Process costing is used where a product moves through two or more distinct manufacturing stages before it is finished, and the output of one process becomes the input for the next. Chemicals, textiles, oil refining, and paint manufacturing all rely on this method. Costs are accumulated separately for each process or department over a period, and then divided by the number of units that passed through that process to get a cost per unit at each stage.

Handling normal and abnormal losses 🔗

A distinctive feature of process costing is dealing with wastage. Some loss during production is expected and unavoidable, called normal loss, and its cost is absorbed by the remaining good units. Anything beyond that expected level is abnormal loss, and its cost is separated out and charged directly to the costing profit and loss account rather than being spread across good production. This distinction matters because it stops inefficiencies from artificially inflating the cost per unit of the units that were produced correctly.

Operating costing: costing services rather than products 🔗

Operating costing, sometimes called service costing, is designed for businesses that provide a service instead of a physical product, such as transport companies, hospitals, hotels, power utilities, and educational institutions. Since there is no physical unit to count, this method uses a composite cost unit relevant to the service. A transport company, for example, calculates cost per passenger-kilometre or per tonne-kilometre, while a hospital might track cost per patient-day and a hotel tracks cost per occupied room-night.

Costs in operating costing are usually classified into fixed costs, such as vehicle depreciation or staff salaries, and variable costs, such as fuel or consumables, since this split helps in setting fares, tariffs, or service charges that cover both categories appropriately. The method also produces useful performance indicators; telecom companies, for instance, closely track average revenue per user as a service-specific benchmark of profitability.

Multiple costing: combining methods for complex products 🔗

Some products are too complex for any single costing method to handle on its own. Multiple costing, also called composite costing, combines two or more of the methods above to cost different components or stages of the same finished product. It is common in industries producing assembled goods with many parts sourced from different manufacturing processes, an approach highlighted in a breakdown of various types of costing methods used across industries.

Automobiles, televisions, aircraft, and computers are the standard examples. A car manufacturer might use process costing for the engine as it passes through casting and machining stages, batch costing for standardised parts produced in lots, and job costing for customised trim options, before combining all these costs to arrive at the total cost of the finished vehicle. As one overview of product costing in complex manufacturing points out, costing composite products inevitably requires costing their individual components before those figures are combined.

Matching the method to the industry 🔗

No single method is superior to the others; each simply fits a particular way of producing goods or delivering services. Some businesses even use a hybrid of two methods when their production genuinely spans two patterns, such as a furniture company using process costing for standard cutting and finishing stages, then switching to job costing for custom polishing or upholstery requested by individual customers.

What do you think? If you were setting up the costing system for a business that manufactures both standard furniture and fully customised interiors, would you pick one method for the entire operation, or design a hybrid approach for the two product lines? And looking at the service sector, what other industries around you might benefit from adopting operating costing more rigorously?

References

1. https://testbook.com/ugc-net-commerce/job-costing-process-costing-and-contract-costing
2. https://live.icai.org/bos/vcc/pdf/Job_Batch_Costing.pdf
3. https://www.taxmann.com/post/blog/understanding-contract-costing
4. http://amjadalikhancollege.edu.in/wp-content/uploads/2020/07/UNIT_OR_OUTPUT_COSTING.pdf
5. https://khatabook.com/blog/hi/single-costing-meaning-characteristics-and-objectives/
6. https://efinancemanagement.com/costing-terms/types-of-costing
7. https://www.inc.com/encyclopedia/product-costing.html