Collecting Factory Overheads: Methods and Sources

Every rupee spent on rent, power, indirect wages, or machine oil inside a factory has to be tracked before it can be charged to a product. But before accountants can classify or distribute these expenses, they need to gather them first. This first step is called collection of factory overheads, and it is far more procedural than it sounds. It relies on coded numbers, day-to-day source documents, and a fair bit of bookkeeping discipline. Get this stage wrong, and every later step in cost accounting, from apportionment to absorption, ends up distorted. Let’s break down how factories actually pull together their overhead figures.

What “collection” really means in overhead accounting 🔗

Collection of overheads is the process of recording every item of indirect cost, as and when it is incurred, in the books maintained for that purpose. It is purely an accumulation exercise: nothing is allocated or apportioned to a department yet. Indirect materials, indirect labour, and indirect expenses are simply gathered together under suitable headings so that the total factory overhead for a period can be known with certainty.

This matters because factory overheads, unlike direct material or direct labour, cannot be traced to a single unit of product. A supervisor’s salary or a factory’s electricity bill benefits the whole plant, not one job card. So the only practical starting point is to collect these scattered costs systematically before deciding how to split them among cost centres.

Standing order numbers: the coding system behind collection 🔗

To avoid a jumble of unrelated expense entries, accountants assign a code, called a standing order number, to each recurring type of factory overhead. Rent, depreciation, indirect wages, and factory insurance would each get their own standing order number, so every voucher, requisition, or invoice for that expense is tagged consistently through the year. This coding is what makes later analysis possible; without it, pulling together “total repairs cost for the quarter” from thousands of scattered entries would be nearly impossible.

How the numbering works 🔗

A common approach uses a combination of digits or a decimal structure: the main expense head gets a whole number, and its sub-categories are represented by decimals attached to that number. Adding up every account that begins with a particular digit then instantly gives the total for that entire category of factory overhead, while narrowing to specific digit combinations isolates a sub-head, such as general factory administration costs. Because the codes signal “standing” or recurring authority to spend, day-to-day transactions under them do not need fresh management approval each time; only unusual, additional spending gets flagged for review.

Standing order numbers vs cost accounting numbers 🔗

It helps to know that standing order numbers are used specifically for factory or production overheads. Administration, selling, and distribution overheads are instead coded using a separate set called cost accounting numbers. Keeping the two systems distinct prevents an office rent expense from accidentally getting mixed into the factory overhead pool, which would inflate production costs and understate administrative ones. This separation becomes especially important later, when overheads are absorbed into product costs using rates like machine hour rate or labour hour rate, since factory overheads and office overheads follow different absorption logic.

The documents and sources used to collect factory overheads 🔗

Standing order numbers give overheads their identity, but the actual rupee figures come from a handful of everyday accounting documents. Cost accountants typically pull data from five or six recurring sources, each capturing a different category of indirect expense.

Store requisitions for indirect materials 🔗

Not every item leaving the stores becomes part of a finished product. Lubricants, cotton waste, cleaning supplies, and minor spares are indirect materials, and their issue is tracked through store requisition slips that record the requisition number, date, quantity, and requesting department. At the end of the month, these slips are compiled into a material issue analysis sheet. The total of indirect materials issued is then debited to the Production Overhead Control Account and credited to the Stores Ledger Control Account, giving a clean, auditable trail from the store shelf to the overhead ledger.

Wage analysis book for indirect labour 🔗

Wages paid to workers who do not work directly on a specific job, such as supervisors, maintenance staff, or material handlers, count as indirect labour and therefore as overhead. This information is first captured in time cards and job cards, tagged with the relevant standing order number for the cost centre involved. At month-end, these entries are consolidated into a wage analysis book, and the total indirect wage cost is charged to the Factory Overhead Control Account, with the corresponding credit going to the Wages Account. Overtime premiums and idle time payments, when treated as overheads rather than direct cost, are also picked up through this same wage analysis process.

Invoices and the purchase journal 🔗

Many overhead items, like maintenance contracts, factory stationery, or third-party repair services, arrive as supplier bills rather than internal issues. These invoices are recorded in the purchase journal along with their standing order number. Periodically, the journal total is debited to the Factory Overhead Control Account and credited to the Cost Ledger Control Account, ensuring every externally billed overhead is captured without being missed or double-counted.

Cash book for petty, immediate expenses 🔗

Small, one-off overhead payments made in cash, such as minor repairs, local conveyance for factory errands, or urgent purchases, do not always pass through the formal purchase cycle. These are recorded directly in the cash book. Reviewing the cash book on a monthly basis and sorting entries by standing order number lets the accountant pick up these smaller, easily overlooked costs and route them to the correct control accounts, whether that is the Stores Ledger, Wages, or Cost Ledger Control Account.

Journal entries for accrued and non-cash items 🔗

Some overheads never involve an immediate cash outflow at all. Outstanding expenses, prepaid costs being written off, and adjustment entries fall into this category. These are recorded through journal entries in the books of original record, with the relevant amount subsequently posted to the appropriate overhead control account. This is also where notional or non-cash charges, such as certain depreciation adjustments, typically get entered.

Subsidiary records for specialised overheads 🔗

A few overhead items are tracked through dedicated registers rather than the general books. A plant register captures depreciation along with data on idle machinery or scrapped equipment. Meter readings feed into power and lighting costs. Lease deeds and municipal assessment records support rent and local tax charges. Together, store requisitions, job or time cards, invoices, the cash book, and these subsidiary records make up the standard set of documents used for collecting overhead, and each is chosen because it is the natural point where that particular expense first gets recorded in the business.

A quick snapshot: source document and what it captures 🔗

Why accurate collection matters for cost management 🔗

It is tempting to treat collection as a clerical formality that precedes the “real” work of apportioning and absorbing overheads. In practice, it decides how reliable everything downstream will be. If a store requisition for indirect materials is missed, or a wage analysis book excludes overtime that should have been treated as overhead, the total factory overhead figure understates the true cost of running the plant. That error then travels through primary distribution, secondary distribution, and finally into the overhead rate used to price a product or a job.

Factory overhead is normally pooled together and then allocated to units produced during the period, which means the accuracy of that pool directly affects reported product cost, inventory valuation, and ultimately, the selling price a business sets. Under-collected overhead can make a factory look more efficient than it really is, while over-collected or duplicated entries can push prices higher than competitors’, costing sales. This is also why standing order numbers matter so much in practice: consistent coding at the point of collection is what allows a cost accountant to reconcile the overhead control accounts against the general ledger and catch errors before they compound.

For a Bachelor of Commerce student, this topic is a reminder that cost accounting is built on disciplined documentation as much as on formulas. The store requisition slip, the wage analysis book, and the humble cash book are not just paperwork; they are the raw data layer on which classification, apportionment, and absorption of overheads all depend.

What do you think? If a factory skipped maintaining a proper wage analysis book for a few months, which parts of its cost sheet do you think would be affected first? And between store requisitions and the cash book, which source do you think is more prone to errors slipping through unnoticed?

References

1. https://www.yourarticlelibrary.com/cost-accounting/overheads-cost-accounting/factory-overheads-items-collection-and-departmentalization/57775
2. https://www.accountingnotes.net/cost-accounting/overheads/factory-overhead/17767
3. https://www.accountingtools.com/articles/stores-requisition
4. https://www.accountingnotes.net/cost-accounting/overheads/overheads-definition-and-collection-labour/10305
5. https://www.yourarticlelibrary.com/accounting/overheads/documents-needed-for-collection-of-overhead/74508
6. https://www.accountingtools.com/articles/factory-overhead