Audit evidence is the information an auditor gathers to support the conclusions in an audit opinion — and it must be both sufficient and appropriate (relevant and reliable) to be credible. This guide breaks down the 8 types of audit evidence — from physical examination to reperformance — with concrete examples and a reliability hierarchy, and shows how CPCON Group leverages every evidence type to deliver accurate, compliant inventory and fixed asset audits.
Audit evidence is the information an auditor gathers to support the conclusions in an audit opinion; it must be sufficient (enough) and appropriate (relevant and reliable). This definition aligns with auditing standards such as AU-C 500 and ISA 500.
In inventory and fixed asset audits, audit evidence must be sufficient, appropriate, and reliable to ensure accuracy and compliance with accounting standards such as GAAP, IFRS, and regulatory requirements.
The quality and quantity of audit evidence directly impact the credibility of audit results. Through its fixed asset audit and verification services and physical inventory counting services, CPCON Group specializes in gathering comprehensive audit evidence across multiple categories to deliver defensible, audit-ready reports for financial reporting, compliance, and operational decision-making.
Physical examination involves direct inspection and verification of tangible assets. This is the most reliable form of audit evidence for inventory and fixed asset audits.
Examples in Practice:
CPCON Approach: Our field teams conduct comprehensive physical examinations using barcode scanners, RFID technology, and mobile data collection devices to ensure 99%+ accuracy in asset verification.
Documentary evidence includes written or electronic records that support asset existence, ownership, valuation, and transactions.
Key Documents:
CPCON Approach: We systematically review and cross-reference documentation from multiple sources, including ERP systems (SAP, Oracle, JD Edwards), to validate asset records and identify discrepancies.
Observation involves watching processes, procedures, and activities performed by client personnel to assess controls and operational effectiveness.
What We Observe:
CPCON Approach: Our auditors observe client operations to identify control weaknesses, process inefficiencies, and opportunities for improvement in inventory and asset management.
Confirmation is the process of obtaining direct written responses from independent third parties to verify information.
Common Confirmations:
CPCON Approach: We coordinate with third parties to obtain independent confirmations, ensuring assets recorded in client systems actually exist at external locations.
Analytical procedures involve evaluating financial and operational data by studying relationships, trends, and ratios to identify anomalies.
Analytical Techniques:
CPCON Approach: Our data analytics team uses advanced tools to perform statistical analysis, identify outliers, and flag high-risk areas requiring detailed investigation.
Inquiry involves seeking information from knowledgeable persons inside or outside the organization through formal or informal questioning.
Who We Interview:
CPCON Approach: We conduct structured interviews to understand processes, controls, and potential issues. Inquiry evidence is always corroborated with other evidence types for reliability.
Recalculation involves independently checking the mathematical accuracy of documents, records, and calculations.
What We Recalculate:
CPCON Approach: We independently recalculate key figures — depreciation schedules, inventory valuation, and impairment math — to verify accuracy and identify calculation errors or system issues.
Reperformance means independently re-executing a control or procedure that was originally performed by the client, to confirm it produces the same result.
What We Reperform:
CPCON Approach: We reperform critical controls and procedures to verify they operate as intended and to surface gaps between recorded and actual results.
Each type of audit evidence shows up differently in a real inventory or fixed asset audit. Here are concrete audit evidence examples, one per type:
Not all audit evidence is equally reliable. Understanding the hierarchy helps prioritize evidence collection:
Collect enough evidence to support conclusions. Sample sizes should be statistically valid and representative of the population.
Evidence must be relevant to the audit objective and reliable based on its source and nature.
Use multiple types of evidence to corroborate findings. Cross-reference physical counts with system records and documentation.
Maintain comprehensive audit workpapers documenting all evidence collected, procedures performed, and conclusions reached.
Across 30+ years and four continents, CPCON Group has conducted thousands of inventory and fixed asset audits, developing proprietary methodologies for collecting comprehensive, defensible audit evidence.
Technology-Enabled Evidence Collection: We use barcode scanners, RFID readers, mobile apps, and cloud-based platforms to capture real-time evidence with photo documentation and GPS coordinates.
Multi-Source Verification: Every asset is verified using at least three types of evidence (physical examination, documentation, and system records) to ensure accuracy.
Compliance-Ready Documentation: Our audit workpapers meet GAAP, IFRS, SOX, and industry-specific regulatory requirements, ready for external auditor review.
Expert Analysis: Our CPAs, CVAs, and industry specialists analyze evidence to identify control weaknesses, valuation issues, and opportunities for improvement.
Audit evidence is the information an auditor gathers to support the conclusions in an audit opinion. To support those conclusions it must be both sufficient (enough in quantity) and appropriate (relevant and reliable in quality), consistent with auditing standards such as AU-C 500 and ISA 500.
The 8 types of audit evidence are: (1) Physical examination — direct inspection and verification of tangible assets, (2) Documentation — written or electronic records supporting asset existence and valuation, (3) Observation — watching processes and procedures performed by client personnel, (4) Confirmation — obtaining direct written responses from independent third parties, (5) Analytical procedures — evaluating financial data by studying relationships, trends, and ratios, (6) Inquiry — seeking information from knowledgeable persons through questioning, (7) Recalculation — checking the mathematical accuracy of records and calculations, and (8) Reperformance — independently re-executing a control or procedure.
Examples of audit evidence include: physical examination — counting inventory items and inspecting machinery on the warehouse floor; confirmation — a signed bank letter or a third-party warehouse stating quantities held; documentation — invoices, purchase orders, the fixed-asset register, and lease agreements; observation — watching the physical-inventory process; inquiry — interviewing the warehouse manager; analytical procedures — inventory turnover ratio and variance analysis; recalculation — re-checking a depreciation schedule; and reperformance — independently re-running a cycle count.
Evidence obtained directly by the auditor, such as physical examination and observation, is the most reliable. External evidence from independent third parties (confirmations) is also highly reliable. Documentary evidence from external sources like invoices and contracts is moderately reliable, while internal documentation with weak controls and oral evidence from inquiry without corroboration are considered less reliable.
Physical inspection (examination) involves directly verifying tangible assets — counting inventory items, inspecting fixed assets, and verifying serial numbers and asset tags to confirm existence and condition. Observation involves watching processes, procedures, and activities performed by client personnel to assess controls and operational effectiveness, such as observing inventory receiving procedures, cycle counting processes, and security controls.
Auditors evaluate sufficiency by ensuring enough evidence is collected to support conclusions, with sample sizes that are statistically valid and representative of the population. Evidence must also be appropriate — relevant to the audit objective and reliable based on its source and nature. Best practice is to use multiple types of evidence to corroborate findings, cross-referencing physical counts with system records and documentation.
Analytical procedures involve evaluating financial and operational data by studying relationships, trends, and ratios to identify anomalies. Key techniques include inventory turnover ratio analysis, variance analysis comparing expected versus actual inventory levels, trend analysis of asset acquisitions and disposals, depreciation expense reasonableness testing, and obsolescence and shrinkage pattern identification.
Partner with CPCON Group for comprehensive inventory and fixed asset audits backed by multiple types of reliable audit evidence. Our proven methodologies ensure accuracy, compliance, and defensible results.