Adverse Opinion

An adverse opinion is a professional opinion made by an auditor indicating that a company's financial statements are misrepresented, misstated and do not accurately reflect its financial performance and health. Adverse opinions are usually given after an auditor's report, which can be internal or independent of the company.

Adverse opinions are detrimental to companies because it implies wrongdoing or unreliable accounting practices. An adverse opinion is a red flag for investors and can have major negative effects on stock prices. Auditors will usually issue adverse opinions if the financial statements are constructed in a manner that materially deviates from generally accepted accounting principles (GAAP). However, they are rare, certainly among established companies that are publicly traded and abide by regular SEC filing requirements. Adverse opinions are more common among little-known firms, that is, if they are able to procure the services of a respectable auditing firm to begin with.

An adverse opinion is one of four main types of opinions that an auditor can issue. The other three are unqualified opinion, which means that financial statements are presented in accordance with GAAP; qualified opinion, which means that there are some material misstatements or misrepresentations but no evidence of systemic non-compliance to GAAP; and disclaimer of opinion, which means that it cannot be determined whether GAAP is followed due to lack of sufficient evidence. The unqualified opinion, obviously, is the best, while an adverse opinion is the worst.

An adverse opinion can in some cases cause de-listing of a company's stock from an exchange. Toshiba Corp. of Japan narrowly escaped this fate when the Japanese affiliate of PriceWaterhouseCoopers gave the company a qualified opinion instead of an adverse opinion on its financial statements in 2017. However, the auditing firm issued an adverse opinion on the company's internal auditing controls, a less serious offense, but one that the company must address to earn back some trust with the investment community.