Inventory audit is not just a year-end stock count. For an auditor, the real question is whether inventory records, physical quantities, ownership, cut-off and valuation are supported by sufficient evidence. ICAI's Guidance Note on Audit of Inventories highlights internal-control evaluation, physical verification, examination of records, attendance at stock-taking and cut-off procedures as core areas. For internal audit work, ICAI's current Compendium of Standards on Internal Audit provides the broader framework for planning, evidence, documentation and controls.
What should an inventory audit establish?
A useful inventory audit should answer five practical questions: does the inventory exist, does the entity have rights over it, are quantities complete and accurate, are movements recorded in the correct period, and is valuation supported by the applicable accounting framework? These objectives overlap, so a strong audit programme connects physical observations with records, purchase and sales documents, production data and valuation workings rather than testing each area in isolation.
1. Understand the inventory process before testing
Start by mapping how inventory enters, moves through and leaves the business. Identify purchase receipt, goods-received-note creation, quality inspection, binning, production issue, inter-location transfer, finished-goods receipt, dispatch, returns, scrap and write-off processes. Record who can initiate, approve and post each movement.
ICAI's inventory guidance specifically points to segregation of incompatible functions, standard forms for recording inventory movement and cross-checking information generated by different departments when evaluating internal controls. This matters because a clean stock count can still hide weak controls if the same person can receive goods, alter records and approve adjustments.
2. Reconcile the inventory universe
Obtain the inventory listing by item, location, quantity and value and reconcile its total with the general ledger or relevant control accounts. Investigate unexplained differences before selecting samples. Include warehouses, factories, branches, third-party locations, goods in transit and inventory held on behalf of others where relevant.
A practical reconciliation checklist includes opening stock, purchases or production receipts, issues or cost of sales, transfers, adjustments, write-offs and closing stock. Large manual journals or repeated adjustments deserve separate attention because they may indicate process weaknesses even when the final balance reconciles.
3. Plan physical verification tests in both directions
Physical verification should test both existence and completeness. Select items from the inventory records and locate them on the floor to test whether recorded stock exists. Then select items physically present and trace them back to the records to test whether stock has been omitted. Record item codes, descriptions, locations and count-sheet references so the test can later be reproduced.
ICAI's guidance notes that physical verification is management's responsibility and discusses the auditor's procedures for obtaining evidence regarding existence, ownership and valuation. It also addresses attendance at stock-taking, the adequacy of stock-taking methods and movement of stock during the count.
Example
Suppose the ERP shows 1,000 units of component X. A floor-to-sheet test identifies 60 units in a quarantine area that are physically present but tagged under an old code. A sheet-to-floor test then finds only 970 units against the ERP quantity. The auditor should not simply report a 30-unit shortage. The quarantine stock, code mapping, pending quality decisions, recent receipts and issues, and any count adjustments should be traced to determine the actual control or recording failure.
4. Control movement during stock-taking
Stock counts become unreliable when receipts, production issues or dispatches continue without controlled documentation. Note the last pre-count and first post-count document numbers for significant movement streams. Where operations cannot stop, maintain a movement log and ensure items moved during counting are not counted twice or omitted.
Cut-off testing should connect the physical count to accounting records. Select transactions immediately before and after the count date and inspect supporting documents to assess whether receipts and dispatches were recorded in the appropriate period. ICAI's inventory guidance expressly identifies cut-off procedures as an area to be considered during stock-taking.
5. Test ownership and third-party inventory
Physical possession does not automatically mean ownership. Identify consignment stock, customer-owned material, goods held for processing, inventory at job workers or third-party warehouses, and goods in transit. Reconcile these populations with contracts, confirmations, dispatch documents or other appropriate evidence. Separating ownership from physical custody prevents both overstatement and omission.
6. Review valuation and slow-moving stock
Quantity testing alone does not establish that inventory is correctly valued. Obtain the valuation methodology and test the underlying cost build-up, allocation logic and relevant supporting records. Analyse ageing, consumption history, subsequent sales or usage, damaged stock, expired items, obsolete models and rejected material. Items that have not moved for long periods should be challenged rather than accepted merely because they physically exist.
The audit file should clearly distinguish a quantity exception from a valuation exception. For example, 100 units may physically exist and be accurately recorded, yet still require valuation attention if they are obsolete or damaged.
7. Use analytics to find exceptions that sampling may miss
Data analysis can make inventory testing more targeted. Useful exception reports include negative quantities, zero-value stock, unusually high unit costs, duplicate item codes, items with no movement, frequent manual adjustments, stock below zero during the year, unusual location transfers near period-end and items whose quantity or value changes sharply compared with prior periods.
ICAI's Standards on Internal Audit framework includes analytical procedures, and its publications page lists standards covering internal controls, risk management, planning, evidence and documentation. See the ICAI Internal Audit Standards Board publications for the current suite.
8. Document exceptions so management can act
An audit observation should explain more than the difference found. Capture the condition, expected control, likely cause, financial or operational risk, evidence, responsible process owner and agreed corrective action. Where possible, quantify the exception and identify whether it is isolated or systemic.
Retain count sheets or electronic count evidence, sample selections, reconciliation workings, cut-off samples, photographs where permitted, confirmations, valuation tests, ageing analysis and management explanations. Good documentation allows a reviewer to understand what was tested, what evidence was obtained and how the conclusion was reached.
Common inventory-audit mistakes
- Testing only high-value items and ignoring completeness.
- Relying on the ERP quantity without reconciling it to physical locations and the ledger.
- Ignoring stock held by or for third parties.
- Counting quantities correctly but not challenging obsolete or damaged inventory.
- Failing to record movement during the stock count.
- Reporting differences without tracing their root cause.
- Using samples without preserving enough evidence to reproduce the test.
Practical takeaway
A strong inventory audit connects controls, records, physical evidence, cut-off, ownership and valuation. Begin with the process and reconciled inventory universe, test from records to floor and floor to records, control movements around the count, investigate ownership and valuation risks, and document each exception to a reviewable conclusion. For professional reference, use ICAI's Guidance Note on Audit of Inventories together with the current Compendium of Standards on Internal Audit.
