What EYs Dramatic Audit Quality Turnaround Reveals About Professional Services Reform

Ernst & Young's Remarkable Transformation

Ernst & Young's remarkable transformation from having the worst audit deficiency rate among Big Four accounting firms to achieving its best performance in 16 years represents one of the most significant quality turnarounds in professional services history. The firm's anticipated deficiency rate of 9% or below for 2025, down from a troubling 46% in 2022, offers a compelling case study in organizational reform under regulatory pressure. However, the methods EY employed to achieve this improvement, and the broader implications for the accounting profession, deserve careful examination.

The scale of EY's quality crisis three years ago cannot be understated. A 46% deficiency rate means that nearly half of the audits reviewed by the Public Company Accounting Oversight Board (PCAOB) contained significant shortcomings. These deficiencies undermine the fundamental purpose of audits: providing reliable assurance to investors about the accuracy of financial statements. When audit quality deteriorates to such levels, it threatens market confidence and raises questions about systemic failures within the firm.

The Strategic Retreat: Client Reduction as Quality Strategy

Perhaps the most controversial element of EY's turnaround strategy has been its deliberate shedding of 132 audit clients, resulting in a net loss of 101 public-company clients between January 2023 and June 2025. This represents a strategic retreat unparalleled in recent Big Four history, particularly as competitors Deloitte, KPMG, and PwC gained 61, 43, and 9 clients respectively during the same period.

Dante D'Egidio, EY's Americas vice chair for assurance, characterized this as an intentional decision to accelerate quality improvements and drive sustainable audit quality. The firm's position is logical: by reducing client volume, auditors can dedicate more resources and attention to each engagement, theoretically improving quality. However, this approach raises important questions about the sustainability and broader implications of such a strategy.

• First, there is the issue of adverse selection. When a firm reduces its client base by roughly 20%, which clients remain and which depart? If EY strategically retained less complex, lower-risk clients while shedding more challenging engagements, the improvement in deficiency rates may partially reflect a less demanding portfolio rather than purely improved capability. The firm maintains that client numbers alone do not capture growth, suggesting it retained larger, more complex clients. Yet the loss of market leadership to Deloitte, which EY had held for at least a decade, indicates significant competitive consequences.
• Second, the precedent this sets for the profession warrants consideration. If firms can improve their deficiency rates primarily through client reduction rather than capability enhancement, it could encourage a race to the bottom where firms compete to audit only the least challenging companies. This would be problematic for market functioning, as complex, higher-risk companies particularly those in emerging industries or undergoing significant transitions need experienced, capable auditors.
• Third, there are implications for the affected companies and the broader market. The 132 companies that left EY had to find new auditors, likely from among EY's competitors. This concentration of potentially higher-risk or more complex audits among the remaining Big Four firms could simply redistribute quality problems rather than solve them systemically. It also raises costs for affected companies, which must manage auditor transitions, and creates potential gaps in institutional knowledge.

Technology and AI: Automation as a Quality Driver

EY's $1 billion investment through 2027 in technology infrastructure, particularly AI-enabled audit and tax platforms, represents a more forward-looking element of its quality strategy. According to Richard Jackson, EY's global and Americas assurance AI leader, the firm has implemented tools that translate client IT system program code into plain English, automate accounting research, validate calculations, and identify inconsistencies requiring follow-up.

The promise of AI in auditing is substantial. Modern financial statements can span hundreds of pages, and the volume of transactions requiring review has grown exponentially. AI can process vast amounts of data far more quickly than human auditors, potentially identifying patterns and anomalies that might escape manual review. The efficiency gains are also significant: Jackson notes that tasks that previously took hours can now be completed in minutes.

• However, AI implementation in professional services introduces new risks that require careful management. First, there is the black box problem. If AI systems identify or fail to identify issues, auditors must understand why to exercise proper professional judgment. Over-reliance on automated systems could lead to a deskilling of the profession, where auditors become less capable of applying critical thinking and professional skepticism.
• Second, AI systems are only as good as their training data and algorithms. If these systems are trained on historical audit data that itself contained biases or blind spots, they may perpetuate or amplify existing problems. The spring 2025 implementation of several new AI tools that Jackson mentioned means these systems will only be evaluated in next year's PCAOB inspections, introducing uncertainty about their actual effectiveness.
• Third, there is a fundamental question about whether AI can truly replicate or enhance the professional judgment and skepticism that lie at the heart of quality auditing. Jackson argues that AI automation frees auditors to focus more on exercising judgment, which he notes is often why professionals joined the field in the first place. This is the optimistic view: that technology handles routine tasks while humans focus on higher-value activities requiring expertise and insight.

The pessimistic view is that as routine tasks become automated, firms may reduce staffing levels or training investments, ultimately eroding the profession's capability to exercise the very judgment that distinguishes quality audits. The accounting profession has experienced this pattern before with earlier waves of technology adoption, where efficiency gains translated into cost reduction rather than quality enhancement.

Organizational Restructuring: Centralization and Standardization

EY's creation of centralized support teams and standardization of audit approaches addresses a fundamental challenge in professional services: maintaining consistent quality across a geographically distributed organization with thousands of individual practitioners. Historically, the Big Four firms have operated as networks of semi-autonomous partnerships, which can lead to significant variation in practices and quality.

Centralized support teams can provide specialized expertise, ensure consistent application of standards, and create accountability mechanisms that are difficult to achieve in more decentralized structures. Standardized approaches reduce the risk that individual auditors or teams will take shortcuts or apply inconsistent methodologies.

However, excessive standardization carries risks. Audit quality depends not just on following prescribed procedures but on adapting approaches to the specific circumstances of each client. Over-standardization can lead to a checklist mentality where auditors focus on compliance with internal processes rather than on understanding the unique risks facing each client. The art of auditing lies in knowing when to dig deeper, which areas require more scrutiny, and how to interpret ambiguous evidence. These skills can atrophy in overly rigid systems.

The effectiveness of EY's restructuring will ultimately depend on whether it strikes the right balance between consistency and flexibility, between process compliance and professional judgment. The dramatic improvement in deficiency rates suggests the firm may have found this balance, but sustained performance over time will provide the real test.

The Regulatory Context: PCAOB Inspections and Their Critics

EY's turnaround must be understood within the context of PCAOB oversight, which has intensified in recent years. Former PCAOB Chair Erica Williams called deficiency rates unacceptable for two consecutive years, explicitly pushing firms to address quality problems that emerged or worsened during the pandemic. Her resignation in July 2025 at SEC Chair Paul Atkins's request adds a political dimension to this story that cannot be ignored.

The PCAOB inspection process involves reviewing selected completed audits to identify deficiencies. Critics argue that this methodology inflates deficiency percentages by counting minor errors alongside substantive problems. If true, this would mean that EY's improvement, while real, may be less dramatic than the numbers suggest. It would also mean that the 46% deficiency rate in 2022, while clearly problematic, may have overstated the severity of quality issues.

However, this criticism should not be accepted uncritically. The PCAOB's methodology is public, and firms know what standards will be applied. If minor errors are counted, firms should implement quality control systems that catch these errors. Moreover, in fields where precision matters, such as financial reporting, the distinction between minor and major errors can be less clear than critics suggest. Small mistakes can sometimes be symptomatic of more significant underlying process failures.

The timing of improvements across all Big Four firms, as noted by acting PCAOB Chair George Botic, suggests that regulatory pressure has been effective in driving quality enhancements. This validates the PCAOB's approach and suggests that continued oversight will be necessary to maintain improvements. The question is whether firms will sustain quality investments if regulatory pressure eases, or whether these improvements represent a temporary response to heightened scrutiny.

Broader Implications for Professional Services

EY's experience offers several lessons for professional services firms facing quality challenges:

• First, dramatic quality improvements are possible but may require difficult strategic choices. EY's willingness to sacrifice market share and client relationships to improve quality demonstrates that turnarounds often involve trade-offs. Firms must be willing to accept short-term competitive disadvantages to achieve long-term sustainability.
• Second, technology investments can drive quality improvements, but only if implemented thoughtfully with appropriate safeguards. AI and automation are tools, not solutions in themselves. Their effectiveness depends on how they are integrated into professional workflows and whether human judgment remains central to critical decisions.
• Third, regulatory oversight, while sometimes burdensome, can catalyze necessary reforms. Without PCAOB pressure, EY might not have undertaken such a comprehensive restructuring. This suggests that effective regulation serves an important market function, correcting information asymmetries and agency problems that can lead to quality deterioration.
• Fourth, quality improvements require sustained investment and organizational commitment. EY's $1 billion technology investment, enhanced compensation for early-career professionals, and extensive training initiatives represent significant resource commitments. Quality cannot be achieved on the cheap.
• Fifth, transparency and accountability matter. EY's public acknowledgment of its quality challenges and its willingness to disclose expected deficiency rates demonstrate a level of transparency that should become standard in the profession. Clients and investors deserve to know about audit quality issues that could affect the reliability of financial statements.

Looking Forward: Sustainability and Systemic Reform

The critical question now is whether EY can sustain these improvements over time. History suggests that quality can deteriorate as quickly as it improves, particularly if firms face revenue pressure or if key leaders who championed reform move on. D'Egidio's statement that client losses are unlikely to persist suggests EY intends to resume growth, which could test whether the firm has truly built sustainable quality systems or merely achieved temporary improvement through portfolio management.

Moreover, while EY's individual turnaround is noteworthy, it does not address systemic issues affecting the audit profession. The Big Four's oligopolistic market position means that quality problems at any one firm have limited competitive consequences. Companies have few alternatives if they need auditors with global capabilities and industry expertise. This market structure reduces the incentive for sustained quality investment.

• Several systemic reforms deserve consideration. First, audit firm rotation requirements, already implemented in some jurisdictions, could reduce the cozy relationships that sometimes develop between auditors and clients, improving independence and skepticism. Second, greater transparency about audit quality metrics would help companies make informed decisions when selecting auditors. Third, reforms to auditor liability rules might better align incentives with quality outcomes.
• The profession must also grapple with business model tensions. Audit firms make more money from consulting services than from audits, creating incentives to view audits as loss leaders or relationship entry points rather than as valuable services in their own right. While regulatory restrictions limit consulting services to audit clients, the overall business model still creates cultural pressures that can undermine audit quality.
• Additionally, the profession faces a talent challenge. As technology automates routine audit tasks, firms must redefine career paths and value propositions for young professionals. If audit work becomes primarily about managing AI tools and reviewing automated outputs, will it attract the talented, skeptical, detail-oriented professionals needed to exercise sound judgment? The profession must evolve its recruitment, training, and retention strategies to address this challenge.

Conclusion: Progress with Caveats

EY's reduction of audit deficiencies from 46% to an anticipated 9% or below represents genuine progress that should be acknowledged. The firm has demonstrated that even severe quality crises can be addressed through strategic focus, resource investment, and organizational restructuring. The improvements benefit not just EY but the broader market, as more reliable audits enhance investor confidence and market efficiency.

However, several caveats temper this positive assessment. The role of client reduction in achieving these improvements raises questions about whether EY has truly solved its quality challenges or partially avoided them by focusing on a less demanding portfolio. The long-term effectiveness of AI tools remains uncertain and will require sustained monitoring. The sustainability of improvements remains to be proven, particularly as the firm indicates it will resume client growth.

More fundamentally, individual firm improvements do not address systemic issues in the audit profession, including market concentration, business model conflicts, and the challenges of maintaining independence and skepticism in long-term client relationships. These structural issues require policy interventions beyond what individual firms can achieve.

For business leaders, EY's experience offers both reassurance and caution. It demonstrates that professional services firms can execute quality turnarounds when properly motivated, suggesting that regulatory oversight serves an important function. However, it also highlights the importance of due diligence when selecting service providers and the value of understanding the specific approaches firms take to quality management.

• Companies should ask potential auditors detailed questions about their quality control systems, technology investments, training programs, and PCAOB inspection results. They should be wary of firms that compete primarily on price rather than quality. And they should recognize that audit quality is not just the auditor's responsibility but requires client cooperation and commitment to transparent financial reporting.
• As professional services firms continue to evolve in response to technological change and regulatory pressure, EY's turnaround will serve as an important case study. Whether it represents a sustainable model for quality improvement or a temporary response to acute pressure remains to be seen. The answer will have significant implications not just for the accounting profession but for all professional services firms that must balance quality, efficiency, growth, and profitability in increasingly complex operating environments.