Internal and Forensic Audit · Special Points relating to Internal Audit in various Entities

Internal Audit in Manufacturing and Trading Entities

Updated 11 October 2026 · Fact-checked

Internal audit in a manufacturing or trading entity is a review of the operating cycle: purchases, stores and inventory, production and costing, sales, fixed assets and controls. You test whether each stage is authorised, recorded, safeguarded and efficient, then report gaps and recommend fixes to management.

Understand Internal Audit in Manufacturing and Trading Entities

A manufacturing company buys raw material, converts it into finished goods and sells them. A trading concern buys finished goods and resells them. Both run on a cycle: procure, store, (produce), sell, collect. The internal auditor follows this cycle and checks each link.

The auditor's job is wider than the statutory auditor's. You look at operations, not only the financial statements. You ask whether purchases are at the right price and quality, whether stores are safe, whether production wastes material, whether costs are captured correctly and whether sales are billed and collected on time.

Manufacturing adds production and costing to the cycle. Trading has no production, so the risk focus shifts to buying, stock holding, pricing, discounts and receivables. Say this difference clearly in answers.

In each area use the same logic: understand the process, identify the risk, check the control, test with evidence, report the gap. A control is only useful if it works in practice. So you test it by sampling documents and by observing and inquiring.

Examiners want the area-wise approach with practical points. Write what you check, why it matters and what you would recommend.

Key rules to remember

Audit cycle for any area: Understand process → Identify risk → Evaluate control → Test → Report; Use this structure for every area of a manufacturing or trading entity.
Purchase document trail: Requisition → Purchase order → Goods received note → Supplier invoice → Payment; Invoice should match order and GRN (three-way match) before payment is released.
Sales document trail: Customer order → Dispatch note → Invoice → Receipt; Every dispatch should be invoiced, and every invoice should have proof of dispatch.
Stock movement: Opening stock + Purchases (or production) − Issues or sales = Closing stock; Use it to reconcile book stock with physical stock and to explain differences.
Inventory turnover: Cost of goods sold ÷ Average inventory; A low ratio can signal slow-moving or obsolete stock. Compare with past periods and the industry.

How to solve Internal Audit in Manufacturing and Trading Entities questions

Use this method for any question on internal audit of a manufacturing or trading entity.

1Identify the entity type and the area asked: purchases, stores, production, costing, sales, fixed assets or controls.
2State the objective of auditing that area in one line, such as safeguarding stock or ensuring correct billing.
3List the key risks, such as unauthorised purchase, pilferage, wastage, wrong costing, unbilled dispatch or idle assets.
4Write the checks you would perform, following the document trail and the controls in place.
5Add tests: sample vouching, physical verification, reconciliation, observation and inquiry.
6Note the red flags and the likely findings, such as slow-moving stock or purchases from a single supplier.
7End with recommendations and the reporting line to management or the audit committee.

Quickest way: Area, risk, check, recommend

When to use it: Use it when the question lists several areas or you have little time.

Write the area as a sub-heading.
Under it, write 3 to 5 bullet checks following the document trail.
Add one red flag or risk for the area.
Close with one recommendation.
Mention the manufacturing versus trading difference once, in the introduction.

Common mistakes in Internal Audit in Manufacturing and Trading Entities

Writing statutory audit procedures such as verifying true and fair view
Students mix up the two audits.
Fix: Focus on operations, controls, efficiency and recommendations to management.
Covering only inventory and ignoring production, costing and sales
Inventory is the most familiar topic.
Fix: Walk through the whole cycle and give each area at least a few points.
Listing checks without risks or purpose
Students memorise checklists.
Fix: Pair each check with the risk it addresses.
Treating trading entities like manufacturing ones
Students reuse one answer.
Fix: Leave out production and costing for traders and stress buying, pricing, stock holding and receivables.
Giving no recommendations or conclusion
Students stop after the checks.
Fix: Always end with the finding and a corrective action.

Worked examples

Example 1

List the points an internal auditor would examine while reviewing the stores and inventory function of a manufacturing company.

Show the solution

Objective: ensure materials are received, stored, issued and recorded properly and are safeguarded.
Receipt: check that goods received notes are prepared on inspection, matched to purchase orders and that quantity and quality checks are done.
Storage: check physical security, access control, proper layout and storage conditions for sensitive items.
Issue: check that issues are made only against authorised requisitions and booked to the correct job or department.
Records: review bin cards and stores ledger, and reconcile them with the books.
Verification: observe periodic and perpetual physical verification and check that differences are investigated and approved.
Valuation and slow stock: review the stock valuation method, and check for slow-moving, obsolete or damaged items and the provisions made.
Review the reorder levels and wastage, scrap and by-product handling.

Answer: The auditor reviews receipt, storage, issue, records, physical verification, valuation and slow-moving stock, and recommends corrections for gaps such as unreconciled differences or weak access control.

Example 2

An internal auditor finds that a trading company dispatches goods on telephone orders and sales invoices are raised several days later. Some dispatches have no invoice. Explain the risk and suggest the audit approach and recommendations.

Show the solution

Risk: unbilled dispatches mean lost revenue, misstatement of sales and stock, and possible misuse or fraud.
Approach: take a sample of dispatch notes or gate passes and trace each to a sales invoice.
Also take a sample of invoices and trace them back to customer orders and dispatch proof.
Check the sequence of invoice numbers for gaps and cancelled invoices.
Review the delay between dispatch and billing, and check whether credit limits and prices were approved.
Reconcile stock records with sales to see whether unbilled dispatches explain shortages.
Recommendations: written customer orders, a system link so that dispatch cannot occur without an invoice, and periodic review of open dispatch notes by a senior person.

Answer: The weakness is a break in the order-dispatch-invoice trail, which creates revenue leakage and fraud risk. The auditor traces dispatches to invoices and back, checks sequence and delays, and recommends that dispatch be linked to billing with supervisory review.

Exam tips

Structure answers area-wise with sub-headings so the examiner can find each mark.
Always link checks to the document trail and to a risk.
State whether the entity is manufacturing or trading and adjust the answer.
In case studies, name the control weakness, its consequence and a recommendation.
Keep practical points ready: physical verification, three-way match, bin cards and gaps in invoice sequence.

Practice questions from Special Points relating to Internal Audit in various Entities

Internal Audit in Manufacturing and Trading Entities: frequently asked questions

How is internal audit of a manufacturing company different from a trading company?

A manufacturing company has production and costing in addition to purchases, stores and sales. A trading company has no production, so the audit centres on buying, stock holding, pricing and receivables.

What does an internal auditor check in inventory?

You check receipt, storage, issue, records, physical verification, valuation and slow-moving or obsolete stock. You also reconcile book records with physical counts and review how differences are handled.

Is the internal auditor responsible for stock valuation in the financial statements?

No. Management prepares the financial statements and the statutory auditor reports on them. The internal auditor reviews the process and controls, including valuation practices, and reports findings to management.

Do I need to write checklists in the exam?

Yes, but pair each point with its purpose. A bare list scores less than checks linked to risks and a recommendation.