By GreenGrowth CPAs Audit & Assurance Team · Public Company Audit, IPO Readiness & Financial Statement Audit · Los Angeles, CA | Updated July 2026 | Audit & Assurance
Critical Audit Matters and Key Audit Matters get used interchangeably more often than they should. The terms describe similar concepts, but they come from different standards and apply in different audit contexts. A CAM is a requirement under PCAOB Standard AS 3101, which governs audits of US public companies. A KAM is the international equivalent, required under ISA 701 and used in most non-US jurisdictions. Both exist for the same purpose: to surface the parts of an audit where the auditor's judgment was working hardest. Understanding the distinction matters for any company preparing for a PCAOB audit, an IPO, or any cross-border reporting situation where both frameworks could apply.
QUICK ANSWER
A Critical Audit Matter (CAM) under PCAOB AS 3101 is any matter communicated to the audit committee that relates to a material account or disclosure and involved especially challenging, subjective, or complex auditor judgment. A Key Audit Matter (KAM) under ISA 701 serves the same purpose internationally. CAMs apply specifically to PCAOB-regulated US public company audits. KAMs apply under the international standard used in most other jurisdictions. The most common CAM categories are goodwill and intangible valuation, income tax positions, and revenue recognition.
CAMs and KAMs: At a Glance
- What CAMs are: Matters arising from a PCAOB audit that were communicated to the audit committee, relate to material accounts or disclosures, and involved especially challenging, subjective, or complex auditor judgment.
- What KAMs are: The international equivalent under ISA 701, representing matters that were of most significance in the audit, selected from matters communicated with those charged with governance.
- Who this applies to: CAMs apply to PCAOB-regulated audits of US public companies. KAMs apply under ISA 701 in most non-US jurisdictions and in certain cross-border reporting situations.
- Most common categories: Goodwill and intangible asset valuation, income tax positions, and revenue recognition account for the largest share of CAMs reported by S&P 500 filers.
- Primary mistake: Treating CAM determination as something the auditor handles independently. The quality of management's documentation and estimates directly drives what becomes a CAM.
- GreenGrowth's role: We help companies preparing for their first PCAOB audit or an IPO understand which areas of their financials are likely to surface as CAMs, and strengthen documentation before the audit, not during it. Book an audit readiness review →
What Is a Critical Audit Matter (CAM)?
Under PCAOB Standard AS 3101, a critical audit matter is any matter arising from the audit of the financial statements that was communicated or required to be communicated to the audit committee, and that meets two additional conditions. First, it relates to accounts or disclosures that are material to the financial statements. Second, it involved especially challenging, subjective, or complex auditor judgment. All three conditions must be present. A matter that was discussed with the audit committee but did not involve unusual judgment is not a CAM. A matter that involved significant judgment but was never communicated to the audit committee is also not a CAM.
The PCAOB adopted AS 3101 in 2017. It represented the most significant change to the standard auditor's report in more than seventy years, moving away from a simple pass-fail opinion toward a report that surfaces specific areas of audit complexity. The PCAOB expects that, in most audits, the auditor will identify at least one CAM. Across a 2026 review of S&P 500 audit reports, firms reported an average of 1.8 CAMs per audit, with goodwill and intangible asset valuation as the single most common category at just over 20% of all CAMs identified, followed by income tax positions and revenue recognition.
An Example of How a CAM Is Identified
Consider a company that acquired a competitor two years ago and now carries a significant goodwill balance on its balance sheet. Management must perform an annual impairment test, which requires forecasting future cash flows, selecting a discount rate, and making assumptions about market conditions. None of these inputs are objectively verifiable. The auditor's evaluation of these assumptions involves real professional judgment about whether management's estimates are reasonable. Because the goodwill balance is material and the auditor's evaluation required especially challenging judgment, this is a textbook CAM. The auditor's report would name the goodwill impairment assessment specifically, explain why it required this level of judgment, and describe how the audit addressed it.
What Is a Key Audit Matter (KAM) and How Does It Differ from a CAM?
A Key Audit Matter serves the same fundamental purpose as a CAM but arises under a different standard. ISA 701, the international standard, defines a KAM as a matter that, in the auditor's professional judgment, was of most significance in the audit of the financial statements of the current period. KAMs are selected from matters the auditor communicated with those charged with governance, which is the international standard's equivalent of the audit committee.
The practical difference for most companies comes down to jurisdiction and applicable framework. CAMs are a PCAOB-specific requirement that applies to audits of US public companies and certain other PCAOB-regulated engagements. KAMs apply under ISA 701 in the large majority of non-US jurisdictions. A company listed only in the US under PCAOB oversight will see CAMs in its auditor's report. A company reporting under International Standards on Auditing, whether because it is listed outside the US or follows ISA-aligned frameworks for other reasons, will see KAMs instead. Companies with cross-border operations or dual listings sometimes need to understand both frameworks simultaneously, particularly during an IPO process that may involve both PCAOB and ISA-aligned reporting considerations.
💬 The Conversation Worth Having
Finance teams preparing for their first PCAOB audit often treat CAM determination as something that happens to them rather than something they actively shape. That framing misses an important point. The auditor does not invent the judgment calls. Management does, through estimates, valuations, and disclosures. If your revenue recognition policy involves significant judgment and your documentation of that judgment is thin, the area is likely to become a CAM regardless of what you do differently. The companies that handle this well start strengthening their documentation on judgment-heavy areas months before the audit begins, not during fieldwork.
Preparing for your first PCAOB audit or an IPO? Let's identify your likely CAM areas before the auditor does.
Book a Review →What Determines Whether a Matter Becomes a CAM?
AS 3101 outlines specific factors auditors must weigh when deciding whether a matter rises to the level of a CAM. These factors include the auditor's assessment of the risk of material misstatement, the degree of judgment involved in management's estimates, the nature and extent of audit effort required, the degree of subjectivity in the auditor's own procedures, and whether specialized skill or outside consultation was needed to address the matter.
The Three Most Common CAM Categories
Goodwill and intangible asset valuation: This is consistently the single largest category of CAMs. Impairment testing requires forecasting, discount rate selection, and market assumptions that carry inherent uncertainty.
Income tax positions: Uncertain tax positions, valuation allowances against deferred tax assets, and the interpretation of complex tax law frequently require significant auditor judgment, particularly for companies operating across multiple jurisdictions.
Revenue recognition: Companies with complex contracts, multiple performance obligations, or significant variable consideration create revenue recognition judgments that auditors must evaluate carefully, especially under ASC 606's principles-based framework.
How Should Auditors Document CAMs and KAMs?
Documentation quality is where the PCAOB has historically found the most inspection deficiencies. The standard requires that audit documentation be detailed enough for an experienced auditor with no prior connection to the engagement to understand how the determinations were made. This is a high bar, and it applies to every matter that meets the first two CAM criteria, not just the ones that ultimately become CAMs.
Completeness of the Evaluation
A common inspection finding is incomplete evaluation. Auditors are required to consider every matter communicated to the audit committee that relates to a material account, not just the matters that feel obviously complex. Critical accounting policies, significant estimates, unusual transactions, and new accounting pronouncements all require documented evaluation, even when the conclusion is that the matter does not rise to a CAM.
Specificity Over Boilerplate
The PCAOB has consistently flagged generic, boilerplate CAM language as a quality concern. A well-documented CAM names the specific account, explains the specific reasons it required especially challenging judgment in this particular audit, and describes the specific procedures performed. Many audit firms now involve personnel outside the core engagement team to review draft CAM language for specificity before it goes into the final report. For companies pursuing this level of rigor in their own internal audit and assurance functions, our audit services team builds documentation practices that hold up to PCAOB-level scrutiny.
How Should Companies Prepare for CAM and KAM Disclosures Before an Audit?
Preparation is not the auditor's job alone. Companies that approach CAM and KAM readiness proactively tend to have smoother audits, fewer surprises at the audit committee level, and stronger disclosures overall.
Identify Your Likely CAM Areas Early
Review your financial statements for the accounts most likely to involve significant estimation: goodwill, intangible assets, tax positions, revenue recognition under complex contracts, and any area involving fair value measurement. These are your probable CAM candidates. Identifying them before the audit begins gives you time to strengthen the underlying documentation rather than scrambling during fieldwork.
Strengthen the Estimate, Not Just the Disclosure
A polished disclosure cannot compensate for a weak underlying estimate. If your goodwill impairment model relies on unsupported growth assumptions, the issue is the model, not the writeup. Build your valuation and estimation processes to withstand scrutiny on their own merits, with documented support for every significant assumption.
Engage the Audit Committee Early and Often
Since CAM status depends in part on what was communicated to the audit committee, regular and substantive communication throughout the year, not just at year-end, creates a clearer record and a better-informed committee. For companies approaching their first PCAOB audit as part of going public, our IPO readiness services build this audit committee engagement process from the ground up. Companies that are already public and need ongoing support can also review our public company audit support services.
▶ CAM vs. KAM Quick Reference
| Feature | CAM (PCAOB AS 3101) | KAM (ISA 701) |
|---|---|---|
| Jurisdiction | US public companies, PCAOB-regulated | Most non-US jurisdictions, ISA-aligned audits |
| Governing body | PCAOB | International Auditing and Assurance Standards Board |
| Communicated to | Audit committee | Those charged with governance |
| Core test | Material + especially challenging, subjective, or complex judgment | Of most significance in the current period audit |
KEY TAKEAWAYS
- ›CAMs are a PCAOB-specific requirement under AS 3101 for US public company audits. KAMs are the international equivalent under ISA 701. The two are related but governed by different standards and jurisdictions.
- ›A matter only qualifies as a CAM if it was communicated to the audit committee, relates to a material account, and involved especially challenging, subjective, or complex auditor judgment. All three conditions must be present.
- ›Goodwill and intangible valuation, income tax positions, and revenue recognition are the three most common CAM categories, together accounting for roughly half of all CAMs reported.
- ›The PCAOB requires documentation detailed enough for an experienced outside auditor to understand the determination. Boilerplate CAM language is a known inspection concern.
- ›Companies preparing for their first PCAOB audit or an IPO should identify likely CAM areas early and strengthen the underlying estimates and documentation before fieldwork begins, not during it.
Frequently Asked Questions
A Critical Audit Matter (CAM) is defined under PCAOB Standard AS 3101 and applies to audits of US public companies regulated by the PCAOB. A Key Audit Matter (KAM) is defined under ISA 701 and applies under the international auditing standards used in most non-US jurisdictions. Both concepts serve the same underlying purpose: surfacing the areas of an audit that involved the most significant auditor judgment.
The practical difference for most companies is which standard applies to their audit, which depends on where the company is listed and which regulatory framework governs its financial reporting. A US public company audited under PCAOB standards will see CAMs in its auditor's report. A company audited under ISA-aligned standards will see KAMs instead.
Under AS 3101, a matter must meet three conditions to qualify as a CAM. First, it must be a matter that was communicated or required to be communicated to the audit committee. Second, it must relate to accounts or disclosures that are material to the financial statements. Third, it must have involved especially challenging, subjective, or complex auditor judgment.
All three conditions must be present simultaneously. A matter that was discussed with the audit committee but did not involve significant auditor judgment does not qualify. A matter that involved significant judgment internally but was never required to be communicated to the audit committee also does not qualify as a CAM.
Based on review of S&P 500 audit reports, the most common CAM category is goodwill and intangible asset valuation, accounting for just over 20% of all CAMs reported. This is followed by income tax positions, which often involve uncertain tax positions and valuation allowances, and revenue recognition, particularly for companies with complex contracts or significant variable consideration.
These categories share a common thread: they all require management to make significant estimates based on assumptions about the future or interpretations of complex accounting or tax guidance, which creates the kind of auditor judgment that AS 3101 is designed to surface.
Among S&P 500 companies reviewed, audit reports averaged 1.8 CAMs per report. The PCAOB has stated that it expects most audits to identify at least one CAM, reflecting the reality that virtually every complex audit involves at least one area of especially challenging judgment.
The number of CAMs in a given audit depends heavily on the complexity of the company's operations, accounting, and control systems. A company with multiple business combinations, significant intangible assets, complex revenue arrangements, and operations across several tax jurisdictions is likely to generate more CAMs than a simpler business with straightforward accounting.
Companies should start by identifying the accounts and disclosures most likely to involve significant estimation, such as goodwill, intangible assets, tax positions, and complex revenue arrangements. These are the most probable CAM candidates. Strengthening the documentation and support behind these estimates well before the audit begins gives management time to address weaknesses rather than discovering them during fieldwork.
Regular, substantive communication with the audit committee throughout the year, rather than only at year-end, also creates a stronger record and a better-informed committee. Companies preparing for their first PCAOB audit as part of an IPO process benefit from building this discipline early, since the audit committee's role and the documentation standards required are often new territory for a company transitioning from private to public reporting.
We work with companies preparing for their first PCAOB audit, an IPO, or ongoing public company reporting to identify the accounts and disclosures most likely to surface as CAMs or KAMs, and to strengthen the underlying documentation and estimation processes before the audit begins. This includes goodwill and intangible valuation support, tax position documentation, and revenue recognition policy review.
For companies in the IPO process specifically, our audit readiness work integrates with the broader transition from private to public company reporting standards, including audit committee engagement practices. To discuss your specific audit readiness needs, book a free consultation with our audit and assurance team.
Know Your Likely CAMs Before Your Auditor Tells You
GreenGrowth CPAs helps companies preparing for their first PCAOB audit, an IPO, or ongoing public company reporting identify and strengthen the judgment-heavy areas of their financials before fieldwork begins.
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Book a free audit readiness review. We will help you identify your likely CAM or KAM areas and build the documentation to support them before fieldwork begins.
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