ISA 501 — Audit Evidence: Specific Considerations for Selected Items: Complete Guide

Key Takeaways

ISA 501 provides specific evidence requirements for three items that commonly require special audit consideration: inventory, litigation and claims, and segment information.
For inventory, the auditor must attend the physical inventory counting (unless impracticable), evaluate management's count procedures, observe the counting, inspect the inventory, and perform test counts. If the count is on a date other than year-end, the auditor must perform additional procedures to cover the intervening period.
For inventory held by third parties, the auditor must request confirmation from the third party or perform inspection/other procedures.
For litigation and claims, the auditor must design procedures to identify potential claims, inquire of management, review legal expense accounts, and — where a risk of material misstatement is assessed — seek direct communication with the entity's external legal counsel. Written representations about known or possible litigation must be obtained.
For segment information, the auditor must obtain sufficient evidence about the presentation and disclosure in accordance with the applicable framework. This is evaluated in relation to the financial statements as a whole, not as a stand-alone opinion.
"Impracticable" for inventory attendance has a high threshold — general inconvenience is not sufficient. If attendance is genuinely impracticable, alternative procedures must be performed; if no alternative can provide sufficient evidence, the auditor must modify the opinion.

What is ISA 501?

ISA 501, titled "Audit Evidence — Specific Considerations for Selected Items," supplements ISA 500 by providing targeted requirements for three areas that consistently demand special audit attention due to their nature, complexity, and susceptibility to misstatement.

The standard does not replace the general evidence framework of ISA 500 — it builds on it with specific procedures that have proven necessary through decades of audit practice. Inventory, litigation, and segment information each present unique challenges that generic procedures may not adequately address.

Part 1: Inventory

Inventory is often one of the largest current assets on the balance sheet, and it is inherently risky: it is physically dispersed, subject to obsolescence and damage, requires estimation (net realisable value), and involves complex cut-off considerations. ISA 501.4–8 sets out specific requirements.

Attendance at physical inventory counting

If inventory is material, the auditor must attend the physical inventory counting unless it is impracticable (ISA 501.4). Attendance involves:

Procedure	Purpose
Evaluate management's instructions and procedures for recording and controlling the count	Determine whether management's count process is designed to produce accurate results
Observe the performance of management's count procedures	Verify that the procedures are actually being followed — staff are counting systematically, areas are marked as counted, items are being identified correctly
Inspect the inventory	Assess the existence and condition of inventory — look for damaged, obsolete, or slow-moving items that may require write-downs
Perform test counts	Independently count selected items and compare to management's records — both "tag to floor" (from count records to physical items, testing existence) and "floor to tag" (from physical items to count records, testing completeness)

When the count is not on the reporting date

If the physical count is conducted on a date other than the balance sheet date (a common practice — many entities count before or after year-end for operational convenience), the auditor must perform additional procedures to determine whether changes in inventory between the count date and the balance sheet date are properly recorded (ISA 501.5).

When attendance is impracticable

ISA 501.7 addresses the situation where attendance is impracticable — for example, inventory stored in a location that poses safety risks, or inventory in a jurisdiction where the auditor cannot gain access. The standard is clear that general inconvenience is not sufficient to make attendance impracticable, and the difficulty, time, or cost involved is not in itself a valid basis for omitting the procedure.

If attendance is genuinely impracticable, the auditor must perform alternative audit procedures to obtain sufficient appropriate evidence about existence and condition. If alternative procedures cannot provide sufficient evidence, the auditor must modify the opinion under ISA 705.

Inventory held by third parties

ISA 501.8 requires the auditor, when inventory is held by a third party (e.g., in bonded warehouses, consignment stock, goods in transit with logistics providers), to:

Request confirmation from the third party as to quantities and condition.
Perform inspection or other audit procedures appropriate in the circumstances (particularly for material amounts or where doubts exist about the third party's integrity).

Making count attendance effective

Count attendance is one of the most hands-on audit procedures — and one of the most frequently criticised in regulatory inspections. Common deficiencies include: arriving at the count but not actually performing test counts, performing test counts but only in one direction (tag to floor), not evaluating management's count procedures, not considering the condition of inventory during inspection, and not adequately documenting the work performed. The count is also one of the best opportunities to observe the entity's operations directly and to assess the tone and competence of management — make the most of it.

Part 2: Litigation and Claims

Litigation and claims represent a significant area of estimation and judgment — the existence of claims may not be readily apparent, their outcome is inherently uncertain, and the amounts involved can be highly material.

Identifying litigation and claims

ISA 501.9 requires the auditor to design and perform procedures to identify litigation and claims that may give rise to a risk of material misstatement:

Inquire of management and, where applicable, others within the entity (including in-house legal counsel) about known or potential litigation and claims.
Review minutes of meetings of those charged with governance and correspondence with the entity's external legal counsel.
Review legal expense accounts — both the current year charges and the detail of what those charges relate to. Unexpected legal fees or new law firms may indicate undisclosed matters.

Communication with external legal counsel

ISA 501.10–11 addresses a key procedure: when a risk of material misstatement has been identified regarding litigation and claims, the auditor should seek direct communication with the entity's external legal counsel. This is typically done through a letter of inquiry (sometimes called a "legal confirmation letter" or "audit inquiry letter to lawyers"), which requests the lawyer to inform the auditor of:

Outstanding litigation and claims.
The lawyer's assessment of the likely outcome.
An estimate of the financial implications, including costs.

The entity authorises this communication. If the lawyer refuses to respond (which can occur due to professional restrictions in some jurisdictions), the auditor must consider whether alternative procedures can provide sufficient evidence.

Written representations

ISA 501.12 requires the auditor to request management (and, where appropriate, those charged with governance) to provide written representations that all known actual or possible litigation and claims whose effects should be considered in preparing the financial statements have been disclosed to the auditor and appropriately accounted for in accordance with the applicable framework.

Part 3: Segment Information

ISA 501.13 requires the auditor to obtain sufficient appropriate audit evidence regarding the presentation and disclosure of segment information in accordance with the applicable financial reporting framework (e.g., IFRS 8 Operating Segments).

The auditor's responsibility is in relation to the financial statements taken as a whole. The auditor is not required to perform procedures that would be necessary to express a separate opinion on the segment information on a stand-alone basis. The procedures typically include:

Obtaining an understanding of the methods used to determine segment information and evaluating whether those methods are likely to result in disclosure in accordance with the framework.
Performing analytical procedures or other procedures appropriate to the circumstances — for example, testing the allocation of shared costs to segments, verifying that segment totals reconcile to the financial statements, and evaluating the appropriateness of segment classifications.

ISA 501 in Your Jurisdiction

Netherlands. COS 501 follows ISA 501 closely. AFM inspections have highlighted deficiencies in inventory count attendance — particularly insufficient test counts, inadequate evaluation of management's count instructions, and failure to consider obsolescence during inspection. For litigation, the AFM expects to see evidence of direct communication with external legal counsel where risks have been identified.

Germany. IDW PS 501 adapts ISA 501. German practice places strong emphasis on physical verification (körperliche Bestandsaufnahme), and the Handelsgesetzbuch (HGB) has specific inventory requirements. For litigation, German practice integrates the legal confirmation process with the Bestätigungsschreiben (confirmation letter) framework.

United Kingdom. ISA (UK) 501 is substantively aligned with ISA 501. The UK has specific guidance from the Law Society on responses to audit inquiry letters, which can limit the information lawyers are willing to provide. The FRC's inspections focus on whether auditors have performed adequate procedures to identify litigation and claims, including review of board minutes and legal expense accounts.

France. NEP 501 implements ISA 501 within the French statutory framework. French practice has specific procedures for communicating with the entity's legal advisers (avocats), and the Ordre des Avocats has established protocols for responding to audit inquiries. For inventory, the commissaire aux comptes is expected to attend the inventaire physique and the specific requirements of the Code de Commerce regarding annual inventories apply.

Frequently Asked Questions

Must the auditor physically count the inventory?

The auditor does not perform the count — management is responsible for counting inventory. The auditor attends the count to observe management's procedures, inspect the inventory, and perform test counts. The distinction matters: the auditor evaluates and tests management's count, not replaces it.

What if the entity has inventory at multiple locations?

The auditor considers the materiality of inventory at each location and the assessed risks when deciding which locations to attend. For significant locations, attendance is expected. For less significant locations, the auditor may perform alternative procedures — but must document the rationale for the approach.

What if the entity's legal counsel refuses to respond to the audit inquiry letter?

The auditor must consider whether alternative procedures can provide sufficient appropriate evidence. These might include reviewing available documentation about the litigation, inquiring of management, and considering the implications for the audit opinion. If sufficient evidence cannot be obtained, the auditor may need to modify the opinion.

Is segment information always audited?

Only if the applicable financial reporting framework requires segment disclosures and the entity meets the criteria. For entities applying IFRS 8, segment information is required if the entity's equity or debt instruments are publicly traded. The auditor's procedures focus on compliance with the framework's presentation and disclosure requirements.