What are analytical procedures?
ISA 520.4 defines analytical procedures as evaluations of financial information through analysis of plausible relationships. That definition covers everything from a simple year-on-year revenue comparison to a regression model predicting payroll costs from headcount data. The standard does not prescribe the method. It prescribes the rigour.
ISA 520.5 sets the requirements for substantive analytical procedures. You develop an expectation of the recorded amount, determine the threshold at which a difference requires investigation, and compare. If the difference exceeds your threshold, you investigate. The strength of the procedure depends entirely on the precision of the expectation. An expectation built from independent data (headcount records, square-metre occupancy, published interest rates) is more persuasive than one built from conversations with management. ISA 520.A5 makes this explicit.
At the completion stage, ISA 520.6 requires you to form an overall conclusion about whether the financial statements are consistent with your understanding of the entity. This is mandatory on every engagement. If the completion analytics reveal an unexpected pattern that was not addressed during fieldwork, the auditor must investigate before signing the opinion.
Key Points
- ISA 520.6 makes analytical procedures mandatory at the completion stage of every audit, not just when used as substantive tests.
- The precision of your expectation determines whether the procedure actually detects a misstatement. Entity-level ratios mask segment-level problems.
- Most inspection findings relate to weak expectations, not missing procedures. Teams compare current-year to prior-year without developing an independent expectation.
- For significant risks, ISA 330.A52 notes that tests of details are ordinarily more responsive than analytical procedures alone.
Why it matters in practice
Worked example: Van Dijk Logistiek B.V.
Client: Dutch third-party logistics provider, FY2024, revenue €58M, Dutch GAAP (RJ) reporter. Van Dijk operates 12 warehouses across the Netherlands and Belgium. Revenue comes from storage fees (contracted monthly rates per pallet position) and handling fees (per unit picked and shipped). The engagement team used substantive analytical procedures to test storage revenue.
Develop an independent expectation: Storage revenue should equal the average number of occupied pallet positions per month multiplied by the contracted rate. The team obtained occupancy data from the warehouse management system (independent of the financial accounting system) and contract rate schedules from the commercial department.
Calculate the expectation: Average monthly occupancy: 42,300 pallet positions. Weighted average rate: €8.40/position/month. Expected annual storage revenue: 42,300 × €8.40 × 12 = €4,263,840. Recorded storage revenue: €4,310,000. Difference: €46,160 (1.1%).
Evaluate the difference: The €46K difference is below the investigation threshold of €87,000 (performance materiality applied to revenue). The team verified that the difference was directionally consistent with a mid-year rate increase of €0.15/position applied to four warehouse contracts effective July 2024. No further investigation required. The substantive analytical procedure provided sufficient evidence over storage revenue without testing individual invoices.
Key standard references
- ISA 520.4: Defines analytical procedures as evaluations of financial information through analysis of plausible relationships between financial and non-financial data.
- ISA 520.5: Sets requirements for substantive analytical procedures — develop an expectation, set a threshold, investigate differences.
- ISA 520.6: Mandatory completion-stage analytical procedures on every engagement.
- ISA 520.A5: The precision of the expectation determines the persuasiveness of the procedure.
- ISA 315 (Revised 2019).6(b): Analytical procedures as risk assessment procedures during planning.
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Frequently asked questions
Are analytical procedures mandatory?
ISA 520.6 makes them mandatory at the completion stage of every audit. As substantive procedures, they are optional but common for routine balances.
What makes an analytical procedure effective?
The precision of the expectation. An expectation built from independent data (headcount, square-metre occupancy, published rates) is more persuasive than one from management conversations. ISA 520.A5 makes this explicit.
Can analytical procedures replace tests of details for significant risks?
Generally no. ISA 330.21 requires substantive procedures specifically responsive to significant risks, and ISA 330.A52 notes that tests of details are ordinarily more responsive.