Definition
An adverse opinion is the most severe opinion on financial statements. Under AU-C 705 the auditor expresses it when, having obtained sufficient appropriate evidence, the auditor concludes that misstatements, individually or in aggregate, are both material and pervasive. The report includes a Basis for Adverse Opinion section describing the matter and, where practicable, its quantified effect.
Why it matters in an audit or review
An adverse opinion tells users not to rely on the statements as presented. It is uncommon because management usually corrects pervasive problems before issuance. Disclosure failures can also trigger it, as when a required framework is not applied in its entirety. Lenders and other users treat it as a serious warning.
Example
Illustrative: an entity prepares consolidated statements but leaves out a controlled subsidiary that is material to the group, contrary to the framework. The effect touches many line items. The auditor judges it pervasive and issues an adverse opinion.
Common mistakes
Confusing it with a disclaimer. An adverse opinion follows from evidence of misstatement. A disclaimer follows from lack of evidence.
FAQ
Does an adverse opinion mean fraud?
No. It means the statements are materially and pervasively misstated, whatever the cause.
Sources
- AICPA, AU-C Section 705, Modifications to the Opinion in the Independent Auditor's Report
- AICPA, AU-C Section 700, Forming an Opinion and Reporting on Financial Statements
Definitions paraphrase AICPA and FASB guidance; read the standard itself before relying on a requirement. Example figures are illustrative. This page is guidance, not professional advice. Report an error