A compilation engagement letter is the written agreement between an accounting firm and its client that sets the terms for a compilation of the client’s financial statements. It defines the scope of the work, assigns responsibilities to each side, states plainly that the accountant is providing no assurance on the numbers, and covers fees, independence, dispute resolution, and termination. Its most important job is drawing a hard line: a compilation is not an audit and not a review, and the letter is the document both parties will rely on if that line is later tested.
What the Letter Is Doing
A compilation is the most limited financial statement service an accountant provides. The accountant takes the records management supplies, applies accounting expertise to arrange them into properly formatted financial statements, and issues a report. There is no testing of data, no inquiries designed to uncover problems, and no examination of supporting documentation.
Compilations are governed by the Statements on Standards for Accounting and Review Services issued by the AICPA’s Accounting and Review Services Committee, and specifically by AR-C Section 80.1AICPA & CIMA. Preparation, Compilation, and Review Standards Because a compilation is a non-attest engagement, the accountant never expresses an opinion or any form of assurance on the financial statements.2AICPA & CIMA. AICPA Statement on Standards for Accounting and Review Services No. 25 The engagement letter needs to mirror that limitation so the client understands what they’re getting before the work begins.
Scope and Objectives
The letter should open with a clear statement of what the accountant has been engaged to do: compile the financial statements of the named entity for a specific period. Identify which statements are being compiled, whether that’s a balance sheet, income statement, statement of cash flows, or all three. Name the financial reporting framework being used, such as generally accepted accounting principles or the tax basis of accounting, because the framework determines how the statements are structured and what disclosures are expected.
This section should reference AR-C Section 80 as the professional framework governing the work.1AICPA & CIMA. Preparation, Compilation, and Review Standards It must also state that the compilation does not include any form of assurance on the financial statements. That is the single most important sentence in the letter from a liability standpoint, because it prevents anyone from later claiming they believed the statements had been verified.
Management’s Responsibilities
The letter must document that management bears responsibility for the financial statements themselves, the underlying data, and the accounting decisions embedded in those statements. This isn’t a formality. If a dispute arises later, the letter is the evidence that management acknowledged ownership of the numbers.
Specifically, the letter should state that management is responsible for:
- The preparation and fair presentation of the financial statements in accordance with the applicable reporting framework, including selecting the accounting principles used and determining that they are appropriate.
- Designing, implementing, and maintaining internal controls relevant to preparing financial statements that are free from material misstatement.
- Giving the accountant access to all records, documents, and other information needed for the compilation, and providing additional or corrected information if the accountant requests it.
- Acknowledging that the accountant will rely on the completeness and accuracy of the information provided, without independently verifying it.
That last point matters more than people realize. The accountant is formatting the data management supplies, not fact-checking it. Locking this responsibility onto management protects the firm from claims based on errors in the underlying records.
The Accountant’s Responsibilities
The letter should describe the accountant’s role in terms that match what a compilation actually involves. The accountant applies accounting and financial reporting expertise to assist management in presenting the financial information in the form of financial statements. That means reading the statements to confirm they appear appropriate in form and are free from obvious material errors.
What counts as an obvious error? Items like an equity account showing up in the liability section of the balance sheet, total assets that don’t tie to the line items, or accrual-basis statements that fail to record receivables. These are formatting and mathematical problems that surface during a careful read, not issues that require audit-level investigation to discover.
The letter should also state that the accountant will issue a compilation report upon completion. That report will state that no audit or review was performed and that no assurance is expressed on the financial statements.3AICPA & CIMA. Illustrative Accountant’s Compilation Reports on Financial Statements
Limitations and Disclaimers
A well-drafted engagement letter doesn’t bury the limitations in boilerplate. It states them in their own section so there’s no ambiguity about what the client is not getting.
The letter should confirm that the compilation is not an audit and is not a review. The accountant will not verify data, test transactions, or evaluate internal controls. The engagement is not designed to detect fraud, illegal acts, or errors in the underlying records, and the accountant has no obligation to search for them. If something surfaces during the normal course of the work, the accountant will raise it, but the engagement itself is not built to find problems hiding beneath the surface.
The letter should also address what happens if the accountant becomes aware that records or information supplied by management are incomplete or inaccurate. The accountant will request corrections. If management does not provide corrected information, the accountant may need to disclose a known departure from the reporting framework in the compilation report or withdraw from the engagement entirely.4AICPA. Accounting and Review Services Clarified AR-C Sections Including this language upfront tells the client that the accountant will not simply attach the firm’s name to statements known to be wrong.
Independence Disclosures
This is where compilations differ from every other financial statement service. An accountant who lacks independence from the client can still perform a compilation, but the impairment must be disclosed. In a review or audit, a lack of independence disqualifies the firm entirely. In a compilation, the work goes forward as long as the report acknowledges the situation.
The engagement letter should address independence up front. If the firm is independent, a brief statement confirming that fact is sufficient. If independence is impaired, the letter should note that the compilation report will include a disclosure. The accountant has two options: the report can simply state that the accountant is not independent without explaining why, or it can describe the specific reasons for the impairment. If the accountant chooses to describe reasons, every reason must be included so the disclosure isn’t misleading.
Common situations that impair independence include the accountant having a financial interest in the client, performing bookkeeping or management functions for the client, or having a close family relationship with someone in the client’s management. Flagging this in the engagement letter means the client isn’t surprised when they see the disclosure in the final report.
Financial Statements That Omit Disclosures
One common use of a compilation is producing financial statements that omit substantially all the disclosures normally required by the reporting framework. A small business that needs compiled statements for a bank loan may not need or want the full footnote disclosures GAAP requires. AR-C Section 80 allows this, and it happens frequently in practice.
If the engagement will produce financial statements without disclosures, the engagement letter should say so explicitly. The compilation report will include an additional paragraph noting the omission and stating that the omitted disclosures might influence a user’s conclusions about the entity’s financial position. The letter should make clear that this omission is by design, not an oversight, and that management has elected to exclude the disclosures.
Fee Structure and Payment Terms
The engagement letter should specify how fees are calculated. Firms typically charge either a flat fee or bill at hourly rates. Whichever method is used, state it clearly. If the fee is hourly, identify the billing rates for the professionals involved. If it’s a flat fee, specify what’s included and whether additional work, such as preparing adjusting entries, would be billed separately.
Payment terms belong in the letter as well: the number of days after invoicing that payment is due, any late fees for unpaid balances, and whether the firm requires a retainer before beginning work. Many firms assess a flat late fee rather than a percentage-based interest charge on overdue balances, which avoids potential issues with state usury laws.
Dispute Resolution and Termination
A section addressing what happens when things go sideways is easy to overlook but valuable when you need it. Many firms include a mediation clause requiring both parties to attempt mediation before pursuing litigation. Some firms add an arbitration clause limited to fee disputes, keeping more consequential professional liability claims in the court system where discovery and appeal rights are preserved.
The letter should also include a stop-work provision. If the client fails to provide requested information, doesn’t pay invoices, or the accountant discovers issues that make continuing the engagement untenable, the firm needs a contractual right to pause or terminate the work. Defining the circumstances under which either party can end the engagement prevents later disputes about whether the firm abandoned the client or the client breached the agreement.
Signatures and Annual Reissue
The engagement letter requires signatures from both the authorized firm representative and the appropriate member of the client’s management, typically the owner, president, or CFO. The signed letter is the formal consent to the terms and the document both sides will point to if disagreements arise later.
For recurring engagements, the firm should assess whether the existing letter still reflects the current terms and scope. Changes in the reporting framework, the financial statements being compiled, or the fee arrangement all warrant an updated letter. Even when nothing has changed, many firms issue a new letter each year so both parties reaffirm the terms rather than relying on a letter signed years ago that no one has looked at since.
The firm should retain the signed letter as a permanent part of the engagement file. It documents the scope of services and the agreed-upon responsibilities, and it’s the first thing a peer reviewer or insurance carrier will ask for if questions about the engagement arise.
How It Differs from a Review or Audit Letter
If you’ve seen review or audit engagement letters, expect the compilation version to look shorter and to sound less committal. The difference across the three comes down to how much assurance the accountant is providing, which drives everything else in the document.
A compilation letter states that the accountant provides no assurance. A review letter provides limited assurance, sometimes called negative assurance, meaning nothing came to the accountant’s attention suggesting the financial statements need material modification. An audit letter provides reasonable assurance, a high level of positive assurance, that the financial statements are free from material misstatement, whether caused by error or fraud.5Public Company Accounting Oversight Board. Auditing Standard 16 – Communications with Audit Committees – Appendix C The fraud language shifts accordingly: a compilation letter disclaims any responsibility for detecting fraud, while an audit letter describes the auditor’s specific obligation to plan and perform the audit to obtain reasonable assurance about material misstatement caused by fraud. The standards referenced differ too. A compilation letter cites AR-C Section 80. A review letter cites AR-C Section 90. An audit letter references PCAOB standards for public companies or Generally Accepted Auditing Standards for nonpublic entities.6Public Company Accounting Oversight Board. AU Section 150 – Generally Accepted Auditing Standards