Australia is contemplating one of the most aggressive shake-ups of the accounting industry anywhere — potentially breaking apart the firms that check corporate Australia's books.
What's being considered
The government, through Assistant Treasurer Daniel Mulino, is consulting on reforms to the Big Four — Deloitte, PwC, EY and KPMG — after a string of scandals, the Canberra Times reported. The options reportedly on the table range from barring firms from selling both audit and consulting services to the same client, all the way to a full structural separation into independent companies. Other ideas include shrinking the maximum size of these partnerships and moving them under the national corporate regulator, ASIC. (Specific proposals are as reported; treat details as provisional pending the consultation.)
That would go further than most peers. In the UK, regulators pushed the Big Four toward "operational separation" — ring-fencing audit from consulting inside the firm — but stopped short of a full break-up, the Financial Reporting Council noted. Australia is weighing a genuine divorce.
The scandals behind it
The push follows a loss of trust. The defining episode was the PwC tax-leak scandal: a partner used confidential government tax-policy information to help win business, an affair that engulfed the firm and Australian politics. More recent allegations have hit KPMG over the handling of confidential information, and Deloitte drew criticism after a government report it produced was found to contain AI-generated errors. Together, they've made "Big Four reform" a live political issue.
Why audit and consulting sit uneasily together
Here's the core problem. The Big Four do two very different things: they audit companies — independently checking that financial statements are accurate, a public-interest job that depends on skepticism — and they sell consulting to those same companies, which is far more lucrative. Critics argue that mix creates a conflict of interest: an auditor may be reluctant to challenge a client too hard if it risks losing millions in advisory fees. Since audit is a relatively small share of revenue and consulting a large one, the incentives can pull the wrong way. Regulators from the US to Europe have wrestled with this for years.
The firms' case
The Big Four defend their integrated model. They argue that combining disciplines brings deeper expertise, that forcing a split would raise costs and could lower quality, and that governance changes already made have strengthened audit independence without the need for a break-up. A structural separation, they warn, would be costly and disruptive for clients and the profession.
Why it matters
For corporate accountability, the stakes are fundamental: an audit is only worth anything if the auditor is genuinely independent, and every accounting scandal — from Enron onward — has turned on that question. For the Big Four, a forced break-up in Australia would reshape a global, highly profitable business and could embolden regulators elsewhere to follow. And for investors and the public, who rely on audited accounts to trust what companies say about themselves, it's a test of whether the system that polices corporate honesty needs restructuring. Boursel takes no side; the takeaway is that Australia is asking, more bluntly than most, whether the firms that audit the economy should also be allowed to sell it advice — and is willing to consider splitting them up to settle it.
