In my 15 years drafting and reviewing hundreds of engagement letters for audit, review, and compilation services across the United States, I can tell you that a clear, compliant audit engagement letter is the single most important document that protects both the CPA firm and the client. A poorly written letter leads to scope disputes, fee disagreements, and even professional liability claims. In this article, I give you a battle-tested audit engagement letter template that I personally use (and continuously update) for financial statement audits under U.S. GAAS and PCAOB standards, plus a fully worked engagement letter audit example you can adapt today.
Download the free Word .docx template at the bottom of this page – no email required.
An audit engagement letter is a written contract between a CPA firm and a client that defines the scope, objectives, responsibilities, fees, and limitations of an audit of financial statements. The AICPA’s AU-C Section 210 (Terms of Engagement) and the PCAOB’s AS 1301 (Communications with Audit Committees) both require the auditor to establish and document the terms in writing before beginning significant work.
In my experience, firms that skip or rush this step are the same ones that later face E&O claims when a client says “I thought the audit included a fraud investigation” or “I didn’t know we had to provide all bank statements.”
Based on current AICPA, PCAOB, and IRS-related guidance, your audit engagement letter format should contain at least the following sections:
Below is the exact sample audit engagement letter I currently provide to my consulting clients (redacted for privacy). Copy-paste it or download the clean Word version at the end.
| [FIRM LETTERHEAD] [CPA Firm Name] [Address] [City, State ZIP] [Phone | Email | Website] [Date] [Client Name] [Client Company Name] [Client Address] [City, State ZIP] Re: Engagement to Audit Financial Statements for the Year Ended December 31, 2025 Dear [Client Contact]: This audit engagement letter confirms our understanding of the terms and objectives of our engagement to audit the financial statements of [Client Company Name] (the “Company”) for the year ended December 31, 2025. Objective and Scope of the Audit We will audit the accompanying balance sheet of the Company as of December 31, 2025, and the related statements of income, changes in stockholders’ equity, and cash flows for the year then ended, including the related notes (collectively, the “financial statements”). The objective of the audit is to express an opinion on whether the financial statements are presented fairly, in all material respects, in accordance with U.S. generally accepted accounting principles (U.S. GAAP). We will conduct the audit in accordance with auditing standards generally accepted in the United States of America (GAAS) and, if applicable, the standards of the Public Company Accounting Oversight Board (PCAOB) for public companies. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether caused by error or fraud. Management’s Responsibilities Management is responsible for the preparation and fair presentation of the financial statements in accordance with U.S. GAAP; this includes the design, implementation, and maintenance of internal control relevant to the preparation and fair presentation of financial statements that are free from material misstatement, whether due to fraud or error. Management is also responsible for providing us with: • Access to all information of which management is aware that is relevant to the preparation and fair presentation of the financial statements • Unrestricted access to persons within the entity from whom we determine it necessary to obtain audit evidence • All minutes of meetings of stockholders, directors, and committees • All significant contracts and legal documents Auditor’s Responsibilities We are responsible for conducting the audit in accordance with GAAS/PCAOB standards and forming and expressing an opinion on the financial statements. An audit involves performing procedures to obtain audit evidence about the amounts and disclosures in the financial statements. The procedures selected depend on the auditor’s judgment, including the assessment of the risks of material misstatement. Because of the inherent limitations of an audit, together with the inherent limitations of internal control, an unavoidable risk exists that some material misstatements may not be detected, even though the audit is properly planned and performed in accordance with GAAS/PCAOB standards. Fees and Billing Our fees are based on the time required by the individuals assigned to the engagement at our standard hourly rates, plus out-of-pocket expenses. We estimate the total fee for this engagement will be between $XX,XXX and $XX,XXX. Invoices are payable upon presentation. Other Matters We will retain audit documentation for a period of seven years in accordance with current regulatory requirements. You agree that any dispute arising from this engagement will first be submitted to mediation… [continue with termination, governing law, etc.] If the foregoing is in accordance with your understanding, please sign and return one copy of this letter. Sincerely, [Partner Name], CPA [CPA Firm Name] Accepted and Agreed: [Client Company Name] By: _______________________________ Date: ________________ Name: [Client Signer] Title: [CEO/CFO] |
Click here to download the fully editable Word template – FREE (updated November 2025 – includes SAS 145 risk assessment language and cybersecurity clause)
Here is a redacted sample of audit engagement letter I issued last month to a $45M revenue manufacturing client in Ohio:
Is an engagement letter required for every audit?
Yes – AU-C 210 explicitly requires it.
Can I use the same letter for review and compilation engagements?
No. Each service has different scope and responsibilities.
Do I need a new letter every year?
Best practice is yes, even if terms are unchanged. Many firms use a “rollover” clause for multi-year engagements.
Disclaimer: This audit engagement letter template and article are provided for informational purposes only and do not constitute legal, accounting, or professional advice. Always consult with qualified counsel and your state board of accountancy before finalizing engagement terms.