Cost Accumulation, Cost Sheets and Accounting Records

Introduction

Cost accumulation is the systematic collection, classification and assignment of costs to products, services, departments, contracts or other cost objects. It connects operational events—purchasing materials, employing labour and using production resources—to inventory valuation, cost control and profit measurement.

A manufacturing entity normally traces costs through four stages:

1. Materials are purchased and held as raw-material inventory.
2. Direct materials, direct labour and factory overhead enter work in progress (WIP).
3. Completed production transfers from WIP to finished goods.
4. Goods sold transfer from finished goods to cost of goods sold before profit is determined.

A reliable system must preserve this sequence. Misclassifying factory overhead directly as cost of goods sold, for example, bypasses WIP and finished-goods valuation and may materially distort profit.

Learning Objectives

After studying this chapter, students should be able to:

• trace manufacturing costs from purchase to production, inventory and sale;
• distinguish direct costs, indirect costs and period costs;
• prepare a cost sheet and statement of cost;
• calculate materials consumed, cost of goods manufactured and cost of goods sold;
• record transactions in integrated and non-integrated accounting systems;
• account for opening and closing WIP;
• calculate and dispose of overhead under- or over-absorption;
• reconcile profits reported by cost and financial accounts; and
• evaluate control, ethical and technological issues in cost accumulation.

1. The Cost-Accumulation System

1.1 Cost objects and cost classification

A cost object is anything for which management requires a separate cost measurement, such as a product, service, customer, department or contract.

A cost is direct when it can be economically traced to a cost object. Direct materials and direct labour are common examples. An indirect cost cannot be economically traced to one cost object and must therefore be allocated or absorbed using a rational basis.

Manufacturing costs are commonly grouped as follows:

Two useful cost combinations are:

Direct expenses are costs other than materials and labour that can be specifically traced to a cost object, such as royalties paid per unit produced.

1.2 Actual, normal and standard costing

Under actual costing, actual direct costs and actual overhead are assigned to production. Because actual overhead is often known only after a period ends, this approach may delay reporting and produce unstable unit costs.

Under normal costing, actual direct materials and direct labour are combined with overhead absorbed using a predetermined rate:

The numerator and denominator must relate to the same period and activity range. The rate may be stated as pounds per labour-hour, pounds per machine-hour or a percentage of direct wages.

Under standard costing, predetermined quantities and prices are used for several cost elements, with variances recorded separately. Standard costing is examined more fully in later chapters.

2. The Flow of Manufacturing Costs

Figure: Manufacturing costs enter WIP, completed costs move to finished goods, and sold units move to cost of goods sold before profit determination.

Factory overhead is assigned to WIP through an overhead absorption process. Finished goods do not become an expense merely because production is completed; they remain an asset until sold.

3. Source Documents and Cost Records

The audit trail begins with source documents and operational records.

Strong internal control requires sequential numbering, approval limits, segregation of purchasing, receiving and recording duties, and periodic physical inventory counts.

4. Preparing a Cost Sheet

A cost sheet is a structured statement showing the components and build-up of cost for a period, product, job or unit. Its precise format depends on the organisation, but the underlying inventory relationships remain consistent.

4.1 Materials consumed

Net purchases equal purchases less purchase returns and allowances. Inward freight is included when it is necessary to bring materials to their present location and condition.

This second formula applies where the raw-material account contains both direct and indirect materials.

4.2 Cost of goods manufactured

Let MC denote total manufacturing costs incurred during the period:

Then:

The formula follows from the WIP inventory identity: goods available for processing consist of opening incomplete production plus current manufacturing inputs. Closing WIP remains an asset, so it is deducted.

4.3 Cost of goods sold and cost of sales

Where normal costing is used, an overhead adjustment may then be required:

This formula assumes the entire variance is written to cost of goods sold. A material variance may instead be allocated among WIP, finished goods and cost of goods sold.

Some organisations also present administration costs within a broader total cost figure. The adopted classification policy should be stated and applied consistently.

4.4 Worked example: statement of cost

A manufacturer reports the following amounts for the year, in £000:

• opening raw materials: 18;
• purchases: 92;
• inward freight: 3;
• purchase returns: 2;
• closing raw materials: 15;
• indirect materials: 6;
• direct labour: 54;
• factory overhead, including indirect materials: 45;
• opening and closing WIP: 12 and 17;
• opening and closing finished goods: 22 and 26;
• selling and distribution costs: 14;
• administration costs: 11; and
• sales revenue: 248.

Materials consumed are 18 + 92 + 3 − 2 − 15 = £96,000. Direct materials used are £96,000 − £6,000 = £90,000.

Gross profit before selling and administration costs is £248,000 − £180,000 = £68,000.

5. Accounting for Work in Progress

WIP contains the accumulated production costs of units that are incomplete at the reporting date. Its measurement affects both inventory and profit.

In job costing, WIP is supported by individual job cost sheets. In process costing, partially completed output may be expressed as equivalent units:

If 1,000 closing units are 60% complete for conversion costs, they represent 600 equivalent conversion units. Materials and conversion may have different completion percentages; separate equivalent-unit calculations are therefore required.

WIP estimation is vulnerable to bias. Overstating completion increases inventory and current profit, while understating completion has the opposite effect. Completion estimates should be supported by production evidence and independently reviewed.

6. Overhead Absorption and Variance Disposal

Applied overhead is calculated as:

The units must be consistent. For example, machine-hours must be multiplied by a rate expressed per machine-hour.

A positive amount is under-absorption. If applied overhead exceeds actual overhead, the difference is over-absorption.

Common causes include:

• spending above or below budget;
• activity differing from the denominator level;
• seasonal production patterns;
• inaccurate forecasts; and
• unexpected changes in prices or production technology.

An immaterial variance is commonly transferred to cost of goods sold. A material variance should normally be prorated among WIP, finished goods and cost of goods sold based on the applied overhead contained in each account. The chosen method should reflect materiality and applicable financial-reporting requirements.

7. Accounting Records

7.1 Integrated accounting

An integrated system uses one set of ledgers for both financial and cost accounting. Cost accounts and financial accounts share the same double-entry records, reducing duplication and eliminating the need for periodic profit reconciliation caused solely by separate books.

Typical entries include:

The balance remaining in factory overhead control represents under- or over-absorbed overhead, subject to the system’s account design.

7.2 Non-integrated accounting

A non-integrated system maintains separate cost and financial ledgers. A general ledger adjustment account—also called a cost ledger control account—makes the cost ledger self-balancing and represents transactions recorded in the financial ledger.

Illustrative cost-ledger entries include:

Subsidiary stores records, job records and finished-goods records must reconcile with their respective control accounts.

7.3 Comparison

8. Reconciliation of Cost and Financial Profits

Separate cost and financial accounts may report different profits because they use different costing rules or include different items.

Common differences include:

• financial income not recorded in cost accounts, such as investment income;
• financial expenses excluded from cost accounts, such as certain financing costs;
• notional costs appearing only in cost accounts;
• different depreciation methods;
• different inventory valuation bases; and
• overhead under- or over-absorption.

When starting from cost profit:

Additions include financial-only income, cost-only expenses and adjustments that make financial profit higher. Deductions include financial-only expenses, cost-only income and adjustments that make financial profit lower. The effect—not merely the label—must be analysed.

Reconciliation example

Cost accounts report profit of £96,000. Financial accounts include investment income of £3,000 and additional financing expense of £2,000. Over-absorbed overhead of £2,000 reduced cost-account profit relative to actual financial cost. Financial depreciation exceeds cost depreciation by £3,000, while financial inventory valuation is £4,000 higher.

A reconciliation is also an internal-control mechanism: unexplained differences may indicate omissions, duplicate postings or classification errors.

9. Illustrative Case: Northshore Components Ltd

Background

Northshore Components Ltd is a fictional manufacturer using normal costing. Fixed factory overhead is absorbed using direct labour-hours. Budgeted fixed overhead is £150,000 at 10,000 labour-hours.

Problem

Actual activity was 9,500 labour-hours and actual fixed factory overhead was £148,000. Management initially claimed that the entire overhead variance resulted from low production activity. The accountant must calculate product cost and evaluate this claim.

Other data are:

• direct materials used: £120,000;
• direct labour: £80,000;
• opening and closing WIP: £20,000 and £18,000;
• opening and closing finished goods: £25,000 and £29,000;
• sales revenue: £430,000; and
• selling and administration costs: £52,000.

Analysis

The predetermined fixed-overhead rate is:

Applied fixed overhead is:

Manufacturing costs incurred under normal costing are:

Cost of goods manufactured is:

Unadjusted cost of goods sold is:

Under-absorbed fixed overhead is:

Assuming the amount is written entirely to cost of goods sold, adjusted cost of goods sold is £346,000. Operating profit is therefore:

Spending and activity effects

The £5,500 under-absorption is not entirely caused by low activity. It comprises two offsetting effects:

Consequently:

Lower activity created a £7,500 unfavorable volume effect, but actual spending was £2,000 below budget and partly offset it.

Approach and outcome

Northshore should report the variance in its two components rather than attributing all £5,500 to low activity. Managers responsible for capacity utilisation should investigate the activity effect, while cost-centre managers should understand how the £2,000 spending saving arose. Persistently low activity may also indicate that the denominator level is unrealistic.

Learning points

• Applied overhead enters WIP; actual overhead is accumulated in overhead control.
• Activity and spending effects should be analysed separately.
• Favourable spending does not eliminate the economic cost of unused capacity.
• Material overhead variances may require allocation among inventories and cost of goods sold.

10. Technology, Governance and Contemporary Practice

Enterprise resource planning systems integrate purchasing, inventory, payroll, production and sales records. Barcodes, radio-frequency identification and manufacturing sensors can record material movements and production activity in real time. Robotic process automation can match purchase orders, receiving reports and invoices.

Artificial intelligence may identify unusual material issues, duplicate invoices, abnormal labour bookings or inconsistent completion estimates. However, automated classifications remain dependent on master-data quality and human oversight. Poorly designed algorithms can repeatedly allocate costs using unsuitable drivers.

Governance priorities include:

• controlled access to inventory and cost records;
• approval of overhead rates and allocation bases;
• preservation of an auditable transaction trail;
• periodic reconciliation of physical and recorded inventory;
• review of manual journal entries;
• transparent treatment of abnormal waste and idle capacity; and
• compliance with relevant inventory valuation and financial-reporting requirements.

Ethical pressure may arise when managers seek to overstate closing WIP, defer overhead variances or classify period costs as inventory. Professional accountants must apply consistency, objectivity and adequate documentation rather than manage earnings through unsupported cost assignments.

11. Limitations and Best Practices

Cost accumulation is not perfectly objective. Indirect-cost allocations depend on chosen drivers, WIP completion estimates involve judgement, and average rates may conceal product complexity. A detailed system may also cost more to operate than the information is worth.

Sound practice therefore includes:

1. defining cost objects and responsibility centres clearly;
2. using causal cost drivers where practicable;
3. reconciling subsidiary records to control accounts;
4. reviewing predetermined rates when operating conditions change;
5. separating normal production cost from abnormal waste;
6. documenting inventory and variance policies; and
7. balancing accuracy, timeliness and the cost of measurement.

Chapter Summary

Cost accumulation traces materials, labour and factory overhead through raw materials, WIP, finished goods and cost of goods sold. A cost sheet summarises this flow and supports inventory valuation, pricing, control and profitability analysis. Factory overhead is assigned to WIP using an actual or predetermined rate; under- or over-absorption must then be investigated and appropriately disposed of.

Integrated accounting records financial and cost transactions in one ledger system, whereas non-integrated accounting uses separate ledgers connected through a general ledger adjustment account. Opening and closing WIP and finished-goods balances are essential to calculating cost of goods manufactured and cost of goods sold. Where separate systems produce different profits, a reconciliation identifies financial-only items, cost-only items, valuation differences and overhead variances. Effective systems also require source-document controls, ethical estimates, auditable technology and consistent accounting policies.

Key Terms

Cost accumulation: Systematic collection and assignment of costs to cost objects.

Cost object: Product, service, department or other item for which cost is measured.

Direct cost: Cost economically traceable to a specific cost object.

Indirect cost: Cost assigned to cost objects through allocation or absorption.

Prime cost: Total of direct materials, direct labour and direct expenses.

Conversion cost: Direct labour plus factory overhead.

Work in progress: Partially completed production held as inventory.

Cost of goods manufactured: Cost of production completed during a period.

Cost of goods sold: Inventory cost of goods sold during a period.

Cost sheet: Structured statement showing the build-up of cost.

Overhead absorption rate: Rate used to assign indirect production costs to output.

Normal costing: Use of actual direct costs and overhead applied at a predetermined rate.

Under-absorption: Excess of actual overhead over applied overhead.

Over-absorption: Excess of applied overhead over actual overhead.

Integrated accounting: Combined financial and cost accounting within one ledger system.

Non-integrated accounting: Maintenance of separate cost and financial ledgers.

General ledger adjustment account: Account linking a self-balancing cost ledger to financial records.

Equivalent units: Expression of incomplete production in terms of fully completed units.

Profit reconciliation: Explanation of differences between cost-account and financial-account profits.

Review Questions

Short Answer Questions

1. What is the difference between a direct cost and an indirect cost?
2. Why is closing WIP deducted when calculating cost of goods manufactured?
3. What does under-absorbed overhead indicate?
4. What is the function of a materials requisition note?
5. How does an integrated accounting system differ from a non-integrated system?

Long Answer Questions

1. Explain the complete flow of manufacturing costs from purchasing to profit determination.
2. Discuss the preparation and managerial uses of a cost sheet.
3. Explain the principal entries in integrated and non-integrated cost-accounting systems.
4. Evaluate alternative treatments of material and immaterial overhead absorption variances.
5. Discuss the control, ethical and technological issues affecting WIP and inventory measurement.

Analytical / Application Questions

1. A company has opening raw materials of £24,000, net purchases of £130,000, inward freight of £6,000, closing raw materials of £28,000 and indirect materials of £9,000. Calculate raw materials consumed and direct materials used.
2. Budgeted overhead is £240,000 at 30,000 machine-hours. Actual activity is 27,000 hours and actual overhead is £224,000. Calculate the absorption rate, applied overhead, total variance and separate budget-spending and activity effects.
3. Cost-account profit is £150,000. Financial accounts include £8,000 investment income, £5,000 additional depreciation and inventory valued £3,000 lower than in the cost accounts. Prepare a reconciliation to financial profit.

Multiple Choice Questions with Answers

Question 1

Which sequence correctly describes the flow of completed manufacturing cost?

A. Work in progress → finished goods → cost of goods sold

B. Factory overhead → finished goods → sales revenue

C. Raw materials → cost of goods sold → work in progress

D. Finished goods → work in progress → profit

Correct Answer: A. Work in progress → finished goods → cost of goods sold

Question 2

Opening raw materials are £12,000, net purchases are £70,000, inward freight is £3,000 and closing raw materials are £15,000. What are raw materials consumed?

A. £64,000

B. £67,000

C. £70,000

D. £76,000

Correct Answer: C. £70,000

Question 3

Which entry records factory overhead applied to production?

A. Debit factory overhead control; credit WIP

B. Debit WIP; credit factory overhead control

C. Debit finished goods; credit factory overhead control

D. Debit cost of goods sold; credit WIP

Correct Answer: B. Debit WIP; credit factory overhead control

Question 4

Opening WIP is £18,000, manufacturing costs incurred are £140,000 and closing WIP is £23,000. What is cost of goods manufactured?

A. £135,000

B. £145,000

C. £158,000

D. £181,000

Correct Answer: A. £135,000

Question 5

Actual overhead is £148,000 and applied overhead is £142,500. What is the overhead position?

A. £5,500 over-absorbed

B. £5,500 under-absorbed

C. £290,500 under-absorbed

D. No absorption variance

Correct Answer: B. £5,500 under-absorbed

Question 6

Budgeted fixed overhead is £150,000, applied overhead is £142,500 and actual overhead is £148,000. Which interpretation is correct?

A. There is a £7,500 favourable activity effect and £2,000 unfavourable spending effect.

B. The entire £5,500 under-absorption is caused by overspending.

C. A £7,500 unfavourable activity effect is partly offset by a £2,000 favourable spending effect.

D. There is a £2,000 favourable total variance.

Correct Answer: C. A £7,500 unfavourable activity effect is partly offset by a £2,000 favourable spending effect.

Question 7

Which account commonly makes a non-integrated cost ledger self-balancing?

A. Trade receivables account

B. General ledger adjustment account

C. Sales revenue account

D. Finished-goods control account

Correct Answer: B. General ledger adjustment account

Question 8

If 800 closing WIP units are 75% complete for conversion, how many equivalent conversion units do they represent?

A. 200

B. 600

C. 800

D. 1,067

Correct Answer: B. 600

Question 9

Opening finished goods are £20,000, cost of goods manufactured is £180,000 and closing finished goods are £25,000. What is unadjusted cost of goods sold?

A. £155,000

B. £175,000

C. £185,000

D. £225,000

Correct Answer: B. £175,000

Question 10

Starting with cost-account profit, how should financial-only investment income be treated in a reconciliation to financial profit?

A. Added to cost-account profit

B. Deducted from cost-account profit

C. Transferred to WIP

D. Included in factory overhead

Correct Answer: A. Added to cost-account profit