PCAOB AS 1220: The Engagement Quality Reviewer Is a Critical Defense Against Audit Failure
- John C. Blackshire, Jr.
- Aug 23
- 8 min read
Engagement Quality Review Training — September 1 and November 3, 2026
A PCAOB audit can involve thousands of hours of work, extensive testing, complicated accounting judgments and hundreds of audit workpapers.
Before the report is issued, however, another experienced auditor has an important responsibility:
Challenge the significant judgments made by the engagement team and determine whether the audit is ready for concurring approval of issuance.
That is the role of the Engagement Quality Reviewer (EQR) under PCAOB Auditing Standard AS 1220 — Engagement Quality Review.
Corporate Compliance Seminars' PCAOB AS 1220: Engagement Quality Review is a focused 2-CPE Auditing webinar covering the EQR's responsibilities, qualifications, documentation requirements, significant judgments and practical review techniques.
Upcoming sessions are:
Tuesday, September 1, 2026 — 10:00 a.m.–12:00 noon Central
Tuesday, November 3, 2026 — 10:00 a.m.–12:00 noon Central
The EQR Is Not Just Another Workpaper Reviewer
There is an important distinction between reviewing workpapers and performing an effective Engagement Quality Review.
AS 1220 establishes the objective of evaluating the significant judgments made by the engagement team and the related conclusions reached in forming the overall engagement conclusion and preparing the engagement report.
That means the EQR should not approach the engagement with the question:
“Did the audit team complete the checklist?”
The stronger question is:
“Do the evidence, significant judgments and conclusions support issuance of this audit report?”
That is a fundamentally different level of review.
Think of the EQR as a Challenge Function
The engagement team has spent months working with the client.
They understand the business.
They have developed expectations.
They have discussed issues with management.
They have reached conclusions.
That experience is valuable.
But it can also create a risk.
People naturally become invested in conclusions they helped develop.
The EQR provides another perspective.
The reviewer can ask:
What evidence supports this judgment?
What contradictory evidence exists?
Did the team appropriately respond to the significant risk?
Was management's explanation sufficiently corroborated?
Is the accounting treatment appropriate?
Does the workpaper actually support the conclusion?
Are we comfortable putting the firm's name on this report?
That challenge function is one reason EQR is so important to audit quality.
The Reviewer Must Have the Right Qualifications
AS 1220 does not contemplate assigning the engagement quality review to whoever happens to be available.
The reviewer must possess appropriate competence, independence, integrity and objectivity. The standard also requires a level of knowledge and competence in accounting, auditing and financial reporting necessary to serve as the engagement partner on the engagement being reviewed.
That makes sense.
You cannot effectively challenge a difficult audit judgment if you lack the technical competence to understand it.
The CCS program specifically addresses the scope of the EQR and qualifications of the engagement quality reviewer.
Objectivity Is Essential
The EQR cannot simply become another member of the engagement team.
AS 1220 specifically addresses this issue: to maintain objectivity, the reviewer should not make decisions on behalf of the engagement team or assume its responsibilities. The engagement partner remains responsible for the engagement.
That creates an important boundary.
The EQR can:
Challenge.
Question.
Evaluate.
Require unresolved matters to be addressed before concurring approval.
But the EQR should not effectively perform the engagement team's work for it.
Otherwise, the reviewer could eventually be placed in the position of independently reviewing his or her own decisions.
Significant Judgments Should Get Significant Attention
Not every workpaper carries the same audit risk.
An effective EQR should focus particularly on the engagement team's significant judgments.
These can arise in areas such as:
Risk assessment
Revenue recognition
Accounting estimates
Fair value
Impairment
Going concern
Related parties
Fraud risks
Management override
Significant unusual transactions
Critical Audit Matters
The objective isn't to reperformance every audit procedure.
It is to determine whether the significant judgments and conclusions are supported.
AS 1220 requires the EQR to evaluate significant judgments related to engagement planning and other important engagement matters, and to evaluate whether reviewed documentation indicates that the team responded appropriately to significant risks and supports its conclusions.
The EQR Should Follow the Risk
Consider a significant accounting estimate.
Management develops an estimate involving assumptions and substantial judgment.
The audit team tests the estimate and concludes:
“Management's estimate is reasonable.”
The EQR shouldn't stop there.
Ask:
Why?
What evidence did the team obtain?
What assumptions were significant?
How were contradictory data evaluated?
How sensitive is the estimate to changes in assumptions?
What evidence came from management?
What independent evidence was obtained?
Were specialists involved?
Did the engagement team challenge management or merely document management's explanation?
This is where EQR contributes directly to professional skepticism.
“Management Explained It” Is Not an Audit Conclusion
A recurring audit-quality problem occurs when management's explanation becomes the evidence.
For example:
“Management explained that the increase was caused by market conditions.”
That may be a useful starting point.
But the EQR should ask:
“What evidence corroborates management's explanation?”
This connects AS 1220 directly with AS 1105 — Audit Evidence.
A strong EQR challenges whether the evidence supporting a significant conclusion is actually sufficient and appropriate.
Contradictory Evidence Deserves Attention
Suppose most of the evidence supports management's position.
One piece of evidence does not.
The engagement team dismisses it as an anomaly.
The EQR should ask:
Why?
A high-quality audit doesn't simply accumulate supporting evidence.
It considers evidence that may contradict the conclusion.
That makes the EQR particularly valuable.
The reviewer is not as invested in the engagement team's original reasoning and can ask:
“What evidence would cause us to conclude that our current position is wrong?”
That is professional skepticism in action.
A Review Signature Does Not Prove a Quality Review
Imagine a workpaper containing: Reviewed — EQR — 11/2/26
What does that establish?
It establishes that someone indicated the workpaper was reviewed.
It does not necessarily demonstrate:
What was reviewed.
What significant judgments were evaluated.
What questions were raised.
How those questions were resolved.
What evidence supported concurring approval.
CCS therefore specifically includes documentation and communication requirements in its AS 1220 curriculum.
Good EQR documentation should allow another experienced auditor to understand what the reviewer actually did.
Concurring Approval Should Mean Something
One of the most important provisions of AS 1220 concerns concurring approval of issuance.
For an audit, the EQR may provide that approval only after performing the required review with due professional care and determining that the reviewer is not aware of a significant engagement deficiency.
The PCAOB identifies circumstances such as failure to obtain sufficient appropriate audit evidence, an inappropriate overall conclusion, an inappropriate engagement report, or lack of firm independence as significant engagement deficiencies.
That means concurring approval is not an administrative signature at the end of the engagement.
It is an audit-quality gate.
The EQR Should Be Involved Early Enough to Matter
A quality review performed five minutes before the report is released has obvious limitations.
If the EQR identifies a serious problem, the engagement team may already be facing tremendous deadline pressure.
Earlier involvement allows important issues to be identified while there is still time to address them properly.
This is supported by the PCAOB's own post-implementation review of AS 1220. PCAOB staff found that engagement quality reviewers became more involved earlier in the audit process after implementation of the standard. The review also found some evidence of improved audit quality, although the PCAOB appropriately cautions that the analysis does not establish causation.
That reinforces a practical lesson:
The EQR should not merely inspect the finished audit. The review should occur early enough to influence audit quality.
EQR Is Particularly Important When the Audit Gets Difficult
The engagement quality review becomes especially valuable when:
Management strongly disagrees with the audit team.
A significant accounting judgment is close.
Evidence is mixed.
A difficult consultation has occurred.
The client is under deadline pressure.
The engagement partner faces commercial pressure.
A significant deficiency or material weakness is involved.
A potential modified opinion is being considered.
These are precisely the situations where an independent, technically competent reviewer can add significant value.
EQR Also Applies Beyond Issuer Financial Statement Audits
AS 1220 applies to more than the annual issuer audit.
The PCAOB standard requires engagement quality reviews for audit engagements, reviews of interim financial information, and specified broker-dealer attestation engagements.
The CCS course accordingly addresses different engagement types subject to EQR, including audits, interim reviews, attestation engagements and broker-dealer examinations.
This makes AS 1220 especially relevant for firms performing PCAOB-regulated broker-dealer work.
AS 1220 Is Also Changing in December 2026
There is another reason this subject deserves attention in 2026.
The PCAOB has adopted amendments to AS 1220 that become effective December 15, 2026. The amended standard connects EQR requirements with the PCAOB's new QC 1000 — A Firm's System of Quality Control, including provisions concerning reviewer competence, independence, integrity and objectivity.
That makes the September and November CCS sessions particularly timely.
Firms should understand AS 1220 not merely as an isolated engagement standard, but increasingly as a component of the firm's broader audit-quality management system.
AS 1220 and QC 1000 Belong Together
Think about the relationship:
QC 1000
Firm-level system for managing audit quality.
↓
Engagement Team
Performs the audit.
↓
AS 1220 EQR
Independently evaluates significant engagement judgments and conclusions.
↓
Concurring Approval
Quality gate before report issuance.
That is an important architecture.
QC 1000 asks whether the firm has an effective system for managing quality.
AS 1220 provides an important engagement-level mechanism for preventing significant audit deficiencies from reaching the issued report.
AI Creates a New EQR Question
Artificial intelligence is increasingly entering audit workflows.
Audit teams may use AI to assist with:
Research
Document analysis
Data analysis
Risk identification
Workpaper drafting
Summarization
Audit-report support
That creates a new question for engagement quality reviewers:
Did technology help the auditor reach the conclusion—or did the auditor begin relying upon technology without sufficiently validating the underlying evidence?
An AI-generated workpaper can be beautifully written.
That doesn't mean the audit evidence supports it.
The EQR should continue asking the same fundamental question:
How do we know?
The technology changes.
The professional responsibility does not.
Five Questions Every EQR Should Keep Asking
A strong reviewer repeatedly returns to five questions:
What are the most significant judgments on this engagement?
What evidence supports those judgments?
What evidence contradicts them?
Did the engagement team respond appropriately to the significant risks?
Would I be comfortable defending this conclusion to a PCAOB inspector?
Those questions capture much of the practical value of engagement quality review.
Two Opportunities to Attend in 2026
CCS's PCAOB AS 1220: Engagement Quality Review is a Basic-level, Group Internet-Based seminar providing 2 NASBA-approved CPE credits in Auditing. No prerequisites or advance preparation are required. The course is offered from 10:00 a.m. to noon Central Time.
Tuesday, September 1, 2026
The September session provides PCAOB audit professionals an opportunity to strengthen EQR practices before the heavy year-end audit cycle.
Tuesday, November 3, 2026
The November session is particularly timely because firms will be approaching the December 15, 2026 effective date of amendments to AS 1220 associated with the PCAOB's new quality-control framework.
The Bottom Line: The EQR Should Be Willing to Say “Not Yet”
The Engagement Quality Review should never become ceremonial.
The EQR's job is not to help the engagement team meet its deadline.
The EQR's job is to independently evaluate significant judgments and conclusions before concurring approval is given.
Sometimes the most important contribution an EQR can make is:
“Not yet.”
Not until the contradictory evidence is resolved.
Not until the additional procedure is performed.
Not until the accounting conclusion is supported.
Not until the workpaper demonstrates sufficient appropriate evidence.
Not until the significant audit issue is properly resolved.
That is not obstructing the audit.
That is protecting audit quality.
The progression should be:
Significant Risk
→ Engagement Team Judgment
→ Audit Evidence
→ Engagement Conclusion
→ Independent EQR Challenge
→ Resolution of Significant Issues
→ Concurring Approval
→ Report Issuance
Corporate Compliance Seminars' PCAOB AS 1220: Engagement Quality Review on September 1 and November 3, 2026 provides two focused CPE hours on developing that discipline.
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