Plain definition
External audit is an independent examination of an entity’s financial statements, performed by an external audit firm or auditor under applicable law and professional standards. The auditor obtains evidence and expresses an opinion on whether the statements are presented fairly, in all material respects, under the applicable reporting framework.
The auditor considers relevant internal controls to plan audit work, but does not take responsibility for designing or operating the company’s controls. An unmodified opinion provides reasonable assurance, not an absolute guarantee that the statements contain no error or fraud. Scope, reporting framework, materiality, and evidence shape the work.
Illustrative example
Suppose an external audit team audits year-end revenue. It selects contracts and delivery evidence, tests selected controls relevant to revenue recognition, confirms some customer balances, and challenges management’s estimates for returns. When it identifies a late credit note, it asks management to assess whether other sales near year-end require adjustment and evaluates the response.
The auditors decide whether the evidence supports their opinion on the financial statements. Management must prepare the statements, correct errors it accepts, and decide on its internal process changes. The audit firm does not become the company’s revenue-control operator.
External audit differs from internal audit in purpose, reporting relationship, and opinion; it is not a general guarantee over every operational risk.
Why it matters
It provides users of financial statements with an independent opinion based on defined standards and materiality.
It prompts disciplined assessment of accounting judgments and evidence at reporting dates.
Practical consequence
Prepare reconciliations, contracts, estimates, and explanations early, with clear ownership of management’s responses to auditor requests.
Understand the audit scope and findings, then keep responsibility for correcting reporting and control issues with management and governance.