The Arthur Andersen Collapse: An Audit Independence Case Study

Arthur Andersen wasn't accused of committing the Enron fraud itself — it was Enron's auditor. But its collapse is arguably the single most consequential case study in the history of the audit profession: proof that an audit firm's reputation, once destroyed, can end an 89-year-old global institution almost overnight, regardless of what a court eventually decides.

What happened

As Enron's fraud began to unravel in late 2001, Arthur Andersen — one of the "Big Five" global accounting firms and Enron's auditor throughout the period the fraud was committed — instructed its employees to destroy documents relating to the Enron engagement after the firm learned the SEC was opening a formal investigation. Federal prosecutors charged Arthur Andersen with obstruction of justice over the document destruction, and on 15 June 2002 a jury found the firm guilty. Because US federal regulations barred convicted felons from auditing public companies, Arthur Andersen was forced to surrender its licence to practise as Certified Public Accountants on 31 August 2002 — a corporate death sentence that took effect before any appeal could even be heard.

The human and professional cost was immediate and enormous: a firm that had employed roughly 85,000 people worldwide, including around 28,000 in the United States, effectively ceased operating as a public accounting practice within months, with most of its remaining practice areas absorbed by the other major firms.

The numbers at a glance

• 89 years — Arthur Andersen's operating history before its 2002 collapse (founded 1913)
• ~85,000 — approximate global employees at the time of the conviction
• 15 June 2002 — date of the obstruction of justice conviction
• 2005 — year the US Supreme Court unanimously overturned the conviction

The twist: the firm won on appeal, but it was already gone

In May 2005 — nearly three years after Arthur Andersen had effectively ceased to exist as a practising firm — the US Supreme Court unanimously overturned the obstruction of justice conviction in Arthur Andersen LLP v. United States. Chief Justice William Rehnquist, writing for the Court, found the jury instructions used at trial had "failed to convey the requisite consciousness of wrongdoing," meaning jurors could have convicted the firm without proof that Andersen employees actually knew their conduct was unlawful or that it was tied to a specific, identifiable official proceeding. Legally, Arthur Andersen was vindicated. Commercially, it made no difference whatsoever — by 2005, the firm's clients, staff, and reputation were already gone, and there was no business left to revive.

Why this matters for accounting and finance students

Arthur Andersen is essential material for anyone studying audit and professional ethics, for a reason that goes beyond the Enron fraud itself: it demonstrates that an audit firm's most valuable asset is trust, and that trust, once lost at sufficient scale, cannot necessarily be rebuilt even if the underlying legal case against the firm is eventually shown to be flawed. The case is also central to understanding why Sarbanes-Oxley introduced stricter auditor independence rules and mandatory audit partner rotation — regulators concluded that the same institutional pressures that led Andersen to prioritise a lucrative consulting relationship with Enron over independent scepticism could recur at any firm without structural safeguards. For students, the case is a stark illustration of the reputational and systemic stakes riding on every audit engagement, far beyond the technical accuracy of any single opinion.

The independence problem behind the document shredding

The document destruction that led to Andersen's conviction didn't happen in isolation — it sat downstream of a deeper structural problem widely blamed for weakening the firm's willingness to challenge Enron in the first place. Andersen earned substantial fees from Enron not just for audit work but for lucrative consulting engagements, creating a commercial incentive to preserve the relationship rather than risk it by pushing back hard on aggressive accounting. Congressional investigations into the Enron collapse highlighted this dual audit-and-consulting relationship as a significant contributor to the erosion of Andersen's independence and professional scepticism over the years leading up to the fraud's discovery. That finding fed directly into Sarbanes-Oxley's restrictions on the non-audit services an auditor can provide to the same client it audits — a rule still shaping how audit firms structure their client relationships today.

Frequently asked questions

Was Arthur Andersen accused of committing the Enron fraud itself?
No — Andersen was Enron's independent auditor. It was charged with obstruction of justice for destroying Enron-related documents after learning of an impending SEC investigation.

Did Arthur Andersen's conviction get overturned?
Yes — the US Supreme Court unanimously overturned the conviction in 2005, but by then the firm had already ceased operating as a viable practice.

What regulatory changes did the Andersen collapse contribute to?
Alongside Enron and WorldCom, it was a key driver of the Sarbanes-Oxley Act of 2002, including its stricter auditor independence and audit partner rotation requirements.

Arthur Andersen is core reading for ACCA and CIMA coursework on audit, professional ethics, and independence. Learnsignal's CPD courses also cover ongoing ethics and audit training for qualified professionals.