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Firm Management | July 9, 2025

Buckle Up: Crafting Effective Engagement Letters 

Rather than viewing an engagement letter as an administrative hassle or a non-value-added activity, consider it a tool that helps memorialize client discussions and manage expectations.

By Cathy Whitley.

When we get in a car, the first thing most of us do is put on a seat belt. If you get into an accident, regardless of who is at fault, that seat belt could help prevent serious injury. Just as a seat belt helps mitigate the risk of injury, using a well-crafted engagement letter may help mitigate the risk of a professional liability claim. 
  
If your firm has never used engagement letters or perhaps has not implemented them consistently, here are some tips to help increase the efficiency and effectiveness of this critical tool. 

View engagement letters as a tool, not a burden 

At the beginning of the client relationship, you probably discussed the client’s needs, the services to be provided, and what the client’s expectations. Rather than viewing an engagement letter as an administrative hassle or a non-value-added activity, consider it a tool that helps memorialize client discussions and manage expectations. This leaves more time for delivering billable services and means less time spent resolving misunderstandings related to scope of services or fees.  

While there is no one-size-fits-all engagement letter, it’s likely a significant portion of engagement letter content will apply to all clients in a specific service line. Create engagement letter templates for each service the firm provides that can then be tailored to specific client needs and circumstances. Common engagement letter components for all services include: 

  • Scope of services. Clearly delineate the services included in the engagement. The description should be clear and include sufficient details to avoid misunderstanding or misinterpretation. 
  • Professional standards by which the engagement will be governed. Referring to the appropriate professional standards helps define and limit the CPA’s professional responsibilities. 
  • Deliverable or work product. Even if the work product appears obvious (such as a completed income tax return in a tax compliance engagement), it is important to clearly define the work product to help avoid disagreements. Any restrictions on the use or distribution of the deliverable should also be articulated in the engagement letter. 
  • Limitations of services. Describe applicable limitations to the service. For example, most engagement letters should include a statement regarding the CPA’s responsibility, or lack thereof, to detect and report on evidence of possible theft or fraud or to identify deficiencies in a client’s internal controls. 
  • CPA firm and management responsibilities. A CPA’s responsibilities are typically limited to the performance of services described in the engagement letter. A client has business operation and oversight responsibilities, including responsibility for making management decisions and performing other management functions. 

Update the templates at least annually, or as necessary, to address changes in applicable professional standards, statutes, and regulations. The firm’s attorney should review the engagement letters to ensure their provisions are enforceable in the applicable jurisdiction. 
  
Many resources are available to help create engagement letter templates. Sample engagement letters are available from the AICPA and for-profit content providers, and may also be available from the firm’s professional liability insurance carrier. Consult multiple sources when developing engagement letter templates to ensure those templates are appropriate and relevant for your firm. 

Aim for 100% engagement letter use over time  

If your firm has not historically required signed engagement letters on all engagements, doing so may seem overwhelming. A multiyear implementation plan may help ease the pain. Begin by grouping engagements into categories. 

  • Category One: Engagements where applicable professional standards require the use of engagement letters, such as audits, reviews, and compilations. This part of the plan should be implemented immediately. 
  • Category Two: Clients or engagements that present elevated professional liability risk, such as high-net-worth individuals, complex engagements with multiple services, business tax clients, and clients raising capital or renegotiating loan terms. Consider implementing engagement letters for this category within one year. 
  • Category Three: Lower-risk engagements with standard terms, such as the preparation of income tax returns for individual clients with ordinary income reported via Forms W-2 and 1099. For these engagements, consider using a unilateral engagement letter that does not require a client signature and can be attached to the annual tax organizer. 

Often, client questions and pushback to engagement letters emanate not from the agreed-upon scope of service or work product but other terms and conditions, such as billing practices, withdrawal provisions, indemnification, limitations of liability, or use of alternative dispute resolution. Consider placing these non-engagement-specific, cross-service terms and conditions in a stand-alone document to be attached to all engagement letters and incorporated by reference. Any modifications may be made via agreement in the engagement letter. Use of a standard terms and conditions document may have the added benefit of appearing to shorten the engagement letter. 

A final tip 

Just like a seat belt, engagement letters can protect your firm only when they used properly. Well-intentioned actions that expand the scope of services can be detrimental in the event of a professional liability claim. If additional services or scope modifications are required, confirm this new understanding, including applicable limitations, with the client in writing, whether through an email or an engagement letter amendment. For new services, issue a new engagement letter. 

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Cathy Whitley, Senior Risk Advisor, AICPA Member Insurance Programs 

An insurance professional for more than 30 years, Cathy Whitley is senior risk advisor for AICPA Member Insurance Programs at Aon. She brings extensive knowledge in property & casualty lines of insurance and has specialized in professional liability for 25 years. As such, she is a valuable resource for CPAs, helping them safeguard their livelihoods from the risk exposures they face in the profession. 

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