Australia is considering a major overhaul of how the Big Four accounting firms are regulated after recent scandals raised concerns about trust, independence and market integrity. The government’s options include separating audit and consulting businesses, bringing the firms under stronger ASIC oversight and cutting the current cap on partnership size.
Those proposals could significantly reshape the operating model of Deloitte, EY, KPMG and PwC in Australia if the review leads to tougher federal rules.
Australia Considers Big Four Accounting Firms Break-Up and Tougher Rules
The policy review follows the release of an options paper by the Treasury department examining possible reforms to the accounting sector. The paper sets out a range of measures the government could pursue, from structural changes inside the firms to stronger external supervision.
The firms at the center of the review are Deloitte, EY, KPMG and PwC, which dominate large parts of Australia’s accounting, audit and consulting markets. Because of their scale and reach, any new rules would have broad implications for clients, regulators and the wider business community.
Why the Government Is Reviewing the Sector
Assistant Treasurer Daniel Mulino said recent behaviour from some large accounting, auditing and consulting firms had undermined trust and raised questions about market integrity. That concern has become a central driver of the review.
The government’s focus is not only on misconduct allegations themselves, but also on whether the current market structure and regulatory settings create enough accountability. In particular, policymakers are looking at whether conflicts can arise when firms provide both audit and consulting services.
Scandals That Intensified Pressure for Reform
PwC Tax Leaks Scandal
A major trigger for the current debate was the 2023 PwC tax leaks scandal. According to the source content, the scandal involved confidential government policy being shared to win clients.
The issue intensified scrutiny of how large professional services firms handle sensitive information and whether existing rules are strong enough to protect public confidence.
KPMG Whistleblower Allegations
KPMG is also facing whistleblower allegations that it shared confidential company information with prospective private-sector clients to bid for auditing work. These are allegations, and they remain important to the broader policy debate because they add to concerns about confidentiality, independence and trust.
Why the Partnership Structure Matters
One of the most important issues in the review is the way the Big Four are structured in Australia. They are regulated as partnerships rather than companies, which means they are not currently supervised by the Australian Securities and Investments Commission in the same way companies are.
That distinction matters because it affects how oversight works in practice. The options paper considers whether the current framework still fits firms of this size and influence, especially when they play major roles in auditing large organisations while also selling advisory services.
Key Reform Options Under Consideration
Structural Separation
Structural separation would require firms to split their audit and consulting operations into separate businesses. Supporters of this approach argue it could reduce conflicts of interest by creating clearer boundaries between assurance work and advisory services.
Such a move would represent one of the most significant reforms under discussion because it would change the way the Big Four are organized at a fundamental level.
Operational Separation
Another option is operational separation. Under this model, firms would be prevented from offering both audit and non-audit services to the same client.
This approach is less sweeping than a full break-up, but it still aims to strengthen independence by limiting situations where commercial relationships may overlap with audit responsibilities.
ASIC Oversight
The review also considers bringing the firms under stronger oversight by ASIC. Because the Big Four currently operate as partnerships rather than companies, this proposal would mark a notable shift in regulatory treatment.
Greater ASIC involvement could align supervision more closely with the scale and public importance of these firms, especially in areas tied to governance, transparency and accountability.
Reducing the Partner Cap
The government is also considering lowering the current 1,000-partner cap to 400. That would move the accounting sector closer to the limit used in other professional services sectors such as law.
This proposal reflects a broader question in the review: whether existing partnership rules remain appropriate for firms that have grown into vast multi-service organisations.
How the Firms Responded
Responses from the firms were mixed but broadly indicated willingness to engage with the process where comments were provided. Deloitte, EY and PwC welcomed the chance to engage with the reform process or expressed support for parts of the options paper.
KPMG did not immediately respond to the request for comment, according to the source content.
Political Pressure for Faster Action
The political pressure around the issue is also growing. Greens senator Barbara Pocock called for urgent action and argued that the Big Four should be regulated like other Australian businesses.
That response reflects a wider push for the government to move beyond consultation if it concludes the current framework is too weak to restore confidence.
What This Could Mean for Australia’s Accounting Sector
The review is policy-focused, but its implications could be far-reaching. Stronger oversight, a lower partner cap, or separation rules could alter how the Big Four structure their services, manage client relationships and handle regulatory compliance in Australia.
For businesses, investors and regulators, the core issue is whether reform can rebuild trust without disrupting the audit market more than necessary. The Treasury paper signals that the government is now actively weighing that balance.
If Canberra moves ahead with stronger federal oversight or separation rules, the review could mark a turning point for Australia’s accounting sector and the future operating model of Deloitte, EY, KPMG and PwC.
