Audit Engagement Letters Template for the United States

An Audit Engagement Letter is a legally binding contract between an audit firm and client that establishes the terms, scope, and responsibilities for audit services. Under United States law, these letters are mandatory before beginning any audit engagement and must comply with federal regulations, professional standards, and state-specific requirements. The document serves as your primary protection against misunderstandings and disputes while ensuring regulatory compliance.

When do you need this document?

You need an Audit Engagement Letter before starting any independent audit of financial statements in the United States. Public companies require these letters to comply with Sarbanes-Oxley Act provisions and SEC regulations. Private companies, non-profits, and government entities also use engagement letters to meet lender requirements, grant compliance, or board governance standards. The letter is essential when changing audit firms, expanding audit scope, or when significant changes occur in your organization's structure or operations. Annual renewals ensure continued compliance with evolving professional standards.

Key legal considerations

Your engagement letter must clearly define the audit scope, including which financial statements will be audited and applicable accounting standards (GAAP or IFRS). The document should specify auditor independence requirements under the Sarbanes-Oxley Act and AICPA Code of Professional Conduct. Include provisions for management representations, access to records, and cooperation from company personnel. Address potential limitations on audit scope and circumstances that might require additional procedures. The letter should outline fee arrangements, timing expectations, and procedures for resolving disputes. Consider including clauses about subsequent events, management letter comments, and communication with audit committees or boards of directors.

Legal requirements in United States

Federal law requires audit engagement letters to comply with the Sarbanes-Oxley Act of 2002 for public companies, mandating auditor independence and specific disclosure requirements. The Securities Exchange Act of 1934 establishes audit requirements for public companies that must be addressed in engagement letters. AICPA Professional Standards AU-C Section 210 provides detailed guidance on engagement letter content and required communications. PCAOB Auditing Standard No. 1301 governs communication requirements with audit committees. State CPA laws vary but generally require licensed practitioners to use written engagement agreements. Your letter must address professional liability limitations where permitted by state law and include required disclosures about the audit firm's qualifications and independence status.