Published by Shah Teelani & Associates | PCAOB-Registered Audit Firm | Reg. No. 7161
Professional skepticism PCAOB auditors must apply is one of the most cited requirements in auditing standards — and one of the most consistently misapplied in practice. Every auditor understands the phrase. Far fewer apply it in the way PCAOB inspectors expect to see it demonstrated in the workpapers.
PCAOB standards define professional skepticism as an attitude that includes a questioning mind and a critical assessment of audit evidence. It is essential to the performance of effective audits under Board standards. The PCAOB continues to observe instances in which circumstances suggest that auditors did not appropriately apply professional skepticism in their audits.
Furthermore, “Without professional skepticism, the audit cannot serve its essential function.” Investors depend on independent audits to provide a meaningful check on the financial statements prepared by company management.
In 2026, the PCAOB has reinforced that professional skepticism PCAOB inspectors evaluate must be visible in every significant area of the engagement — not just held privately in the auditor’s mind. At Shah Teelani & Associates, we treat this as an operational standard on every PCAOB engagement. This blog explains what professional skepticism actually requires — and where failures most commonly occur.
What Professional Skepticism Requires Under AS 1000
PCAOB AS 1000, General Responsibilities of the Auditor in Conducting an Audit, consolidates and modernizes the professional skepticism standard previously found in AS 1015. AS 1000 clarifies and enhances the definitions of due professional care, professional skepticism, competence, and professional judgment, ensuring these principles are clearly understood and effectively implemented.
Professional skepticism under AS 1000 requires the auditor to maintain a questioning mind throughout the engagement. This means forming conclusions only after critically evaluating audit evidence — including evidence that contradicts management’s representations. Moreover, it means actively seeking evidence that might challenge management’s position, not just gathering evidence that confirms it.
All aspects of an audit benefit from professional skepticism. The PCAOB expects auditors to identify and assess risks of material misstatement, gather and evaluate audit evidence, and evaluate audit results to form an audit opinion.
Consequently, professional skepticism is not a phase of the audit. It applies continuously — from risk assessment through planning, fieldwork, evaluation of results, and final opinion.
The Questioning Mind: What It Looks Like in Practice
A questioning mind does not mean assuming management is dishonest. Rather, it means approaching every significant judgment, assumption, and representation with structured inquiry — regardless of the auditor’s existing relationship with management or prior-year conclusions.
Practically, a questioning mind produces specific behaviors in the engagement. Before reviewing management’s estimate or analysis, the auditor forms an independent expectation of what the result should be — based on external data and market information. After reviewing management’s work, the auditor specifically asks what could go wrong with this conclusion and what evidence might contradict it. Furthermore, where explanations for variances or unusual items come only from management, the auditor seeks independent corroboration rather than treating the explanation as sufficient.
The challenges of auditing estimates may be compounded by cognitive bias, which could lead auditors to anchor on management’s estimates and inappropriately weigh confirmatory over contradictory evidence.
Breaking that anchoring pattern requires deliberate effort. Building the independent expectation before reviewing management’s position is one of the most effective tools for achieving genuine skepticism — because it prevents the auditor from unconsciously beginning with management’s answer and working backward.
Critical Assessment of Audit Evidence
Critical assessment means the auditor evaluates whether the evidence obtained actually supports the conclusion — not just whether evidence exists. Two types of failure commonly appear in PCAOB inspection findings.
The first failure is relying on management-provided information without evaluating its reliability. Management can prepare schedules, analyses, and reports that appear comprehensive. However, if the underlying data is inaccurate, incomplete, or influenced by management’s incentives, the evidence built on that data does not support the conclusion the auditor draws from it. Consequently, critical assessment requires the auditor to evaluate the source and reliability of every piece of evidence — not just its content.
The second failure is treating absence of contradictory evidence as confirmation. Just because no red flags appear does not mean no problems exist. Critical assessment requires the auditor to actively seek contradictory evidence — not passively note its absence. Where management’s explanation for an unusual item is plausible but unverified, the auditor must pursue independent corroboration. A plausible explanation is not the same as a supported one.
Where Professional Skepticism Most Often Fails
PCAOB Staff Audit Practice Alert No. 10 describes a number of threats to professional skepticism inherent in the audit environment, including incentives and pressures to build or maintain a long-term audit engagement or to avoid significant conflicts with management.
These pressures are real. Long-standing client relationships, budget constraints, time pressure, and the organizational cost of conflict all create incentives for auditors to accommodate management rather than challenge it. However, none of these pressures exempts the auditor from the skepticism requirement. Moreover, the audit opinion carries no less value — and no less accountability — because the engagement relationship is comfortable.
Specific Areas Where Skepticism Deficiencies Appear
PCAOB inspections identify professional skepticism failures most frequently in specific high-risk areas. Each one shares a common characteristic: management exercises significant judgment and the auditor must independently evaluate whether that judgment is reasonable.
Accounting estimates. Where management applies a discount rate, growth assumption, or loss rate, the auditor must evaluate whether that assumption is supportable by external evidence — not just whether it falls within a theoretical range. Furthermore, the auditor must evaluate potential management bias by considering where assumptions consistently land relative to the range of reasonable alternatives.
Revenue recognition involving variable consideration. Where contracts include performance bonuses, rebates, or variable pricing, management must estimate the amount of variable consideration. Accepting management’s estimate without independently evaluating the methodology and data inputs represents a skepticism failure — particularly where prior-period estimates were consistently revised upward at year-end.
Going concern assessments. Management’s mitigation plans must be evaluated for feasibility — not just existence. An auditor who documents that management has a plan without independently assessing whether that plan is achievable has not exercised skepticism. Consequently, the workpapers must show the auditor evaluated the plan’s assumptions against available external evidence.
Related party transactions. Transactions outside the normal course of business with related parties require specific skepticism. Management’s assertions about arm’s-length pricing and business purpose must be evaluated against independent evidence — not accepted on the basis of management’s representation alone.
Fraud risk areas. Professional skepticism is particularly important in examining areas that involve significant management judgment or transactions outside the normal course of business. Examples include nonrecurring reserves, financing transactions, and related-party transactions.
Cognitive Biases That Undermine Skepticism
Understanding the specific biases that undermine professional skepticism helps auditors build processes that counteract them.
Anchoring bias causes auditors to rely too heavily on the first piece of information they receive — typically management’s own estimate or explanation. Once anchored, the auditor evaluates all subsequent evidence relative to that starting point rather than forming an independent view. Developing independent expectations before reviewing management’s work directly counters this bias.
Confirmation bias leads auditors to seek and give more weight to evidence that confirms management’s position. Designing procedures specifically to look for contradictory evidence — not just corroborating evidence — reduces this risk. Moreover, the workpapers must document consideration of contradictory evidence even where the auditor ultimately concludes it does not change the conclusion.
Familiarity threats arise from long-standing audit relationships where the auditor develops trust in management’s representations that exceeds what evidence actually supports. Rotating team members, fresh partner review of high-risk areas, and explicit re-evaluation of prior-year assumptions each year all help counter familiarity threats.
Time pressure compresses the investigation of anomalies and unusual items. Where time constraints force shortcuts on high-risk areas, the engagement likely lacks sufficient appropriate evidence regardless of how the workpapers are organized. Consequently, engagement planning must protect time for genuine skepticism in significant areas — not treat it as time available for compression.
Professional Skepticism Must Be Visible in the Workpapers
Perhaps the most important practical point about professional skepticism in PCAOB audits is this: exercising skepticism without documenting it produces the same inspection outcome as not exercising it at all.
Without clearer expectations and processes for evaluating skepticism, auditors must visibly demonstrate and document skeptical behavior to ensure compliance and mitigate the likelihood and consequences of regulatory scrutiny.
Documentation of professional skepticism does not require a separate workpaper labeled “skepticism.” Instead, it appears throughout the engagement file in specific ways. Workpapers record what the auditor considered as contradictory evidence and why it did not change the conclusion. Furthermore, they show the auditor’s independent expectation developed before reviewing management’s analysis. They document the corroborating evidence the auditor obtained to verify management’s representations. Additionally, they record specific challenges the auditor made to management’s assumptions and how management responded.
A workpaper that records only agreement with management — without any evidence that the auditor challenged, verified, or independently evaluated management’s position — fails to demonstrate professional skepticism regardless of how thorough the procedural steps appear.
The Role of Firm Culture and Leadership
The audit firm and lead engagement partner should ensure that audit staff are empowered to exercise their professional skepticism and challenge the judgments of management. This may involve supporting audit staff in exploring areas of heightened risk and red flags, insulating audit staff from any undue pressure to accept less than persuasive audit evidence, and refusing management requests or demands to replace audit team members.
Professional skepticism cannot exist in a vacuum. Engagement teams operating under pressure to maintain client relationships, avoid fee overruns, or limit conflict with management will naturally moderate their skepticism over time. Leadership must therefore actively reinforce that challenging management is expected — and that budgets should accommodate adequate investigation of significant issues.
Applying professional skepticism can sometimes come at a cost — whether it is budget overruns, conflicts with management, or pressure from within the audit firm to maintain client relationships. However, absorbing that cost is precisely what the audit function requires. An opinion that costs nothing to reach is an opinion that demanded nothing of its maker.
AI and Professional Skepticism in 2026
Technology is reshaping how auditors perform procedures. Data analytics, AI-assisted risk assessment, and automated population testing are all becoming standard tools. However, these tools introduce a specific risk to professional skepticism.
PCAOB Acting Chair George Botic noted that while AI has enhanced risk assessment, reduced manual processes, and made it possible to efficiently analyze entire populations of data, overreliance on AI may ultimately threaten auditors’ exercise of professional skepticism and judgment.
An auditor who accepts AI-generated risk flags without questioning the model’s assumptions, data inputs, or methodology has replaced one form of management anchoring with another. The tool produces a result — and the auditor anchors on it. Consequently, applying professional skepticism to AI-assisted procedures requires the auditor to understand what the tool does, evaluate whether the inputs are reliable and complete, and challenge whether the outputs reflect the actual risk in the engagement.
Technology amplifies what auditors can see. Professional skepticism determines whether they genuinely question what they find.
What Issuers and Audit Committees Should Know
Professional skepticism is the auditor’s obligation — but its exercise depends in part on the governance environment the company creates. Audit committees that actively support independent, challenging auditors protect investors and strengthen financial reporting quality. Finance teams that respond to auditor questions with transparency rather than advocacy make genuine skepticism easier to exercise.
Specifically, audit committees should be alert to signs that management resists auditor scrutiny — requesting team member changes, providing explanations that are difficult to verify independently, or characterizing auditor challenges as unreasonable. These patterns warrant direct engagement with the auditor and, where necessary, direct communication with the PCAOB.
The Bottom Line
Professional skepticism in PCAOB audits is not an attitude the auditor holds privately. It is a discipline that must be visible in every significant procedure, every significant judgment, and every significant conclusion throughout the engagement. Where it exists only in the auditor’s mind — and never in the workpapers — it provides no regulatory protection and no genuine assurance to investors.
In 2026, with PCAOB inspections continuing to identify skepticism failures as drivers of Part I.A deficiencies and AI tools introducing new anchoring risks, every registered firm must treat professional skepticism as both an individual auditor obligation and a firm-level cultural commitment.
Shah Teelani & Associates (PCAOB Reg. No. 7161) builds professional skepticism into every significant procedure on every engagement. We work with US-listed and OTC public companies that understand the difference between an audit that confirms management’s work and one that independently evaluates it.
If your organization requires a PCAOB-registered auditor who applies genuine professional skepticism, we welcome the conversation.
Shah Teelani & Associates PCAOB-Registered Audit Firm | Reg. No. 7161 Ahmedabad | Dubai | United States
