Glossary term
Audit
An audit is an independent examination of financial statements, controls, or other information to provide assurance against defined criteria.
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What Is an Audit?
An audit is an independent examination of financial statements, internal controls, compliance, or other information against defined criteria. In a financial statement audit, an independent auditor performs procedures to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether caused by error or fraud.
Audits do not guarantee that every error or fraud has been found. They are designed to provide a high, but not absolute, level of assurance. The result is an auditor's report that expresses an opinion or explains why an opinion cannot be expressed.
Key Takeaways
- An audit is an independent examination against a reporting framework or other criteria.
- Financial statement audits are intended to provide reasonable assurance, not absolute assurance.
- Auditors test evidence, assess risks, evaluate estimates, and consider whether disclosures are fairly presented.
- Public-company audits follow PCAOB standards in the United States.
- Audit quality matters because investors, lenders, boards, and regulators rely on audited information.
How a Financial Statement Audit Works
An audit begins with planning and risk assessment. The auditor learns about the business, identifies areas where material misstatement could occur, and designs procedures to respond to those risks. The work may include testing controls, confirming balances, examining documents, testing transactions, evaluating estimates, reviewing disclosures, and performing analytical procedures.
Management prepares the financial statements. The auditor evaluates them. That distinction matters. An audit does not transfer responsibility for accounting records from management to the auditor. It provides independent assurance over the financial statements that management has prepared.
What Users Learn
An audit can increase confidence in reported revenue, expenses, assets, liabilities, cash flows, and disclosures. It can also reveal control issues, accounting disputes, going-concern uncertainty, or other matters that affect how users read the company. For public companies, the audit report may include critical audit matters that describe especially challenging, subjective, or complex areas of the audit.
Audited statements can affect financing costs, investor confidence, acquisition diligence, bank covenants, regulatory filings, and board oversight. A missing, delayed, or modified audit opinion can be a serious signal.
Where Audits Can Mislead
A clean audit opinion is not a statement that the company is a good investment, that management is honest in every respect, or that the company will remain solvent. It means the auditor reached the opinion described in the report based on work performed under applicable standards.
Audits are limited by materiality, judgment, sampling, evidence quality, estimates, collusion risk, and the fact that some fraud is deliberately concealed. The useful reading is careful: an audit improves reliability, but it does not remove business, market, or fraud risk.
The Bottom Line
An audit provides independent assurance over financial statements or other subject matter. It is a central part of financial reporting discipline, but readers should understand the scope, assurance level, auditor's opinion, and what the audit does not promise.