Audit Engagement Letter

Updated on April 24, 2024
Article byPrakhar Gajendrakar
Edited byAshish Kumar Srivastav
Reviewed byDheeraj Vaidya, CFA, FRM

What Is Audit Engagement Letter?

An Audit Engagement Letter is a formal document that confirms the acceptance of the audit process and is dispatched by the auditor. This comprehensive letter includes essential information such as objectives, criteria, scope, and extent of the audit, also affirming the appointment of the auditor for each specific audit assignment.

What Is Audit Engagement Letter

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After the communication process is concluded, the auditor ensures that the engagement letter is sent to clients before the audit begins. This preemptive measure is crucial to clearly articulate the client’s acceptance and proactively address potential misunderstandings, errors, or disputes that may arise during or after the audit.

Key Takeaways

  • An audit engagement letter formalizes an auditor’s acceptance, outlining crucial details and establishing terms for the audit process. 
  • Clients often annually revise and sign this foundational document, ensuring alignment with changing circumstances.
  • Many corporations utilize varied audit engagement letter templates tailored to their specific needs. These templates streamline processes, customizing terms and conditions for unique engagements.
  • Without this letter, no audit process can commence, and its boundaries and expectations prevent misunderstandings and disputes. The letter serves as a cornerstone, facilitating a transparent and mutually beneficial relationship between auditors and clients.

Audit Engagement Letter Explained

An audit engagement letter is an official document, confirming an auditor’s acceptance of the audit, and formal appointment validation, sent to all clients. These letters outline the specific goals, scope, and broad responsibilities associated with the audit process. It is typically more subtle, and brief compared to formal contract documents. Through this document, both parties establish clear expectations about the nature of the work and each other’s roles.

Audit Engagement Letter Meaning

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The purpose of audit engagement letter outlined is to prevent misunderstanding, future disputes, or errors in work operations. The auditor presents this document before the audit and engagement commencement, and formal acknowledgment occurs only after clear communication and receipt. The definition emphasizes its integral and mandatory role in the audit process, serving as widely accepted evidence between the auditor and clients in case of disputes or unclear clauses.

It elaborates on each party’s responsibilities during the audit, including additional help, resources, and services to ensure a smooth process. For every audit firm, it is crucial to establish policies on acquiring new clients and training existing ones. Many firms use a standard audit engagement letter sample, but it’s essential to note that if the auditor is not independent, it may lead to noncompliance and negative publicity.


Lets understand the concept with the help of some examples.

Example #1

Suppose a local bank requires an audit. After communication and mutual understanding between the bank and the auditor, the auditor issues an audit engagement letter to confirm the appointment formally. This comprehensive letter outlines specific responsibilities, scope, broad duties, and obligations associated with the audit, including a 90-business-day timeline and the required resources for the process.

The audit, a routine practice for many banks and financial institutions, involves a thorough review and assessment of bank statements, balance sheets, and financial reports. This process ensures transparency, identifies potential crises, and guards against malicious or fraudulent activities.

In the letter, the auditor specifies compensation details, the audit end date, and the payment method. This information facilitates smooth functioning and establishes clear expectations between the auditor and the local bank.

After 90 days, the auditor submits a comprehensive report, concluding the audit process and receiving the agreed-upon fees. While this serves as a simplified example, it’s important to note that real-world scenarios involve additional factors and considerations.

Example #2

With the implementation of Statement on Auditing Standards (SAS) 136, benefit plan sponsors are now tasked with additional duties and responsibilities. Under this new standard, plan sponsors, as outlined by the Employee Retirement Income Security Act (ERISA), must engage a qualified accountant to audit financial statements if their plans have 100 or more participants.

The audit engagement letter, a crucial component of this process, requires plan sponsors to explicitly acknowledge their responsibilities, including maintaining plan documents and ensuring accurate transactions. The added responsibilities underscore the Importance of thorough preparation for audits, ensuring compliance with the new requirements under SAS 136.


Let us have a look at the sample below to understand standard format of this document:

Letter Format


The contents of the normal letter include the following:

  1. Auditors’ duties: The letter explicitly delineates the auditor’s responsibilities and duties, covering all facets of the audit process, reporting, implementation, and administration.
  2. Client or management’s responsibilities: This section outlines the client’s responsibilities, emphasizing their duty to provide necessary resources and documents for the audit process.
  3. Scope of work: A crucial component that outlines the scope of the audit, including procedures, internal controls, access, accounting systems, audit evidence, field testing, and reporting structure.
  4. Written representation: The letter includes written representations from management, safeguarding company assets, and confidential statements.
  5. Audit objectives: It specifies audit objectives, clarifying that the primary purpose is not only to detect malicious practices, errors, defalcations, and frauds but also to ensure the accuracy of financial statements and compliance with regulations.
  6. Nature of services: This section defines the nature and scope of the auditor’s services, categorizing them as additional, statutory, or professional, with explicit acknowledgment.
  7. Fees and compensation: A separate section details the auditor’s fee and additional charges, including the payment date.
  8. Confirmation: A critical aspect ensuring formal execution, signed confirmation from both parties—auditor and client—demonstrates mutual agreement on the terms and conditions outlined in the engagement letter.


The importance of this document:

  • It serves as a crucial communication tool between the auditor, clients, and other involved parties, fostering clear understanding and expectations.
  • It bridges the gap between the scope of work and the expectations of both parties, outlining limitations and ensuring alignment.
  • The letter clearly outlines and delineates the specific responsibilities of the auditor during the contract period.
  • It defines the fee and compensation offered for services, including details about the payment date.
  • The letter aids the auditor in measuring the scope of work, assessing available resources, and understanding necessary guidelines.
  • It allows the auditor to schedule future dates effectively, ensuring they can plan their workload and be available for all commitments.
  • It functions as a legal document establishing the service agreement between the client and the auditor.
  • In the event of any error, lack of service, or performance issues, the engagement letter serves as a tool to resolve disputes between the auditor and the clients.

Frequently Asked Questions (FAQs)

1. Is audit engagement letter mandatory?

Yes, this letter is mandatory for auditing processes. It serves as a formal agreement between the auditor and the client, outlining critical information, confirming the auditor’s appointment, and providing legal proof of the audit process and its terms. It is a fundamental document that establishes clear expectations and responsibilities for both parties.

2. How long does an audit engagement letter last?

The duration of this letter varies, typically lasting for the specific period covered by the audit. It is common for such letters to be revisited and updated annually, especially in long-term business relationships, to ensure alignment with any changes in the engagement terms or regulations. The letter’s validity extends throughout the audit process, providing a clear framework for the agreed-upon terms and conditions during that period.

3. Who can sign an audit engagement letter?

The letter is typically signed by both parties involved—the client and the auditor. This mutual agreement formalizes the terms and conditions of the audit, confirms the auditors’ appointment, and outlines the scope and responsibilities. The auditor preferably signs and submits the letter before the commencement of the audit process.

This article has been a guide to what is Audit Engagement Letter. Here, we explain the concept along with its examples, format, and importance. You may also find some useful articles here –

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