International Standard on Auditing (ISA) 620, "The Auditor's Expert," is a critical component of modern financial statement audits. It provides a framework for how an auditor should engage and utilize the work of an expert, defined as a person or firm possessing special skill, knowledge, and experience in a particular field other than accounting or auditing. The scope of ISA 620 is broad, encompassing the auditor's responsibilities from the initial decision to use an expert, through the evaluation of their work, to the final reporting on the financial statements. This standard ensures that the auditor can obtain sufficient appropriate audit evidence, even when dealing with complex or specialized areas that fall outside their direct expertise.
The decision to engage an expert is a crucial first step governed by ISA 620. An auditor will consider using an expert when the subject matter requires specialized knowledge that the audit team does not possess. Examples include valuing complex financial instruments, determining the actuarial liabilities for pension plans, assessing the value of unique assets like art or antiquities, or interpreting complex legal agreements. If the auditor identifies such a need, ISA 620 requires them to evaluate whether the expert's skills and experience are appropriate for the audit objective. This involves considering the expert's qualifications, reputation, and independence. For instance, an auditor auditing a large real estate developer might engage a qualified valuation expert to assess the fair value of the company's extensive property portfolio, a task that requires specialized real estate appraisal knowledge.
Once an expert is engaged, ISA 620 outlines the auditor's responsibilities in overseeing and evaluating the expert's work. The auditor must plan the work to be performed by the expert, agreeing on the scope of their work, the objectives, and the expected deliverables. This collaboration is essential for ensuring that the expert's findings will provide relevant and reliable audit evidence. The auditor must also understand the nature, scope, and objectives of the expert's work and assess the adequacy of that work. This might involve reviewing the expert’s methodology, assumptions, and the data used. For example, if an actuary is engaged to assess pension liabilities, the auditor must review the actuarial assumptions used (like discount rates and mortality rates) to ensure they are reasonable and consistent with industry practices and the company's circumstances.
A significant aspect of ISA 620's scope is the auditor's responsibility to obtain sufficient appropriate audit evidence regarding the expert's findings. This means the auditor cannot simply accept the expert's conclusions at face value. They must perform procedures to confirm the expert's findings. These procedures might involve testing the data provided to the expert, performing analytical procedures on the expert's results, or re-performing some of the expert's calculations. If the expert's findings are to be used in forming the audit opinion, the auditor must be satisfied that those findings are appropriate for the purpose of the audit. In the case of the real estate valuation expert, the auditor might check a sample of the valuation reports against market data or review the expert's documentation for consistency.
The implications of ISA 620 extend to the auditor's report. If the auditor relies on the work of an expert and this reliance is significant to the audit opinion, the auditor may choose to include an "emphasis of matter" paragraph or an "other matter" paragraph in their report to refer to the expert's work. This is not required if the auditor has fully obtained sufficient appropriate audit evidence through the expert's work and their own procedures. However, if the expert's work is crucial and the auditor has not been able to obtain sufficient evidence to corroborate it independently, transparency in the audit report becomes important. This ensures users of the financial statements are aware of the specialized nature of certain estimations and valuations.
In conclusion, ISA 620 plays a vital role in maintaining audit quality and addressing the increasing complexity of business transactions and valuations. Its scope ensures that auditors are equipped to handle areas requiring specialized knowledge by guiding them on the judicious and effective use of external experts, thereby enhancing the credibility and reliability of financial statement audits. The standard provides a clear pathway for auditors to integrate specialized insights into their work, ultimately benefiting stakeholders who rely on audited financial information.