CAMICO Tip of the Month: Engagement Letter Essentials

July 20, 2020

Provided by CAMICO, the OSCPA's preferred provider of Professional Liability Insurance

Engagement Letter Essentials

Engagement letters help CPA firms improve communication with clients, document engagements more effectively, and protect the firms from litigation. Letters should be as detailed as possible in describing the nature and extent of the services that a firm is being retained to perform, as well as the services that are outside the scope of the engagement.

Similarly, engagement letters should be as detailed as possible regarding the client's responsibilities and obligations that will facilitate the engagement (e.g., providing necessary documents and accurate information in a timely manner).

The following guidelines of dos and don'ts are provided to assist you in writing effective engagement letters.

Engagement letters should …

  • State the purpose of the engagement.
  • Define the scope and limits of the engagement (specifically what the firm will and won't do).
  • Specify known negative conditions or adverse situations.
  • Note client instructions, responsibilities, deliverables and dates.
  • Note reliance on facts provided by the client.
  • Outline terms of fee collections and the consequences of late payment.
  • Include a stop-work clause.
  • Indicate the firm’s record-retention policy.
  • Include third-party service provider language, if applicable.
  • Confirm the client’s acknowledgment of the terms of the agreement and request the client’s signature.

Additional considerations …

  • Include warnings regarding inadequate internal controls.
  • Explain limitations regarding financial statement distribution.
  • Include alternative dispute resolution language (i.e., mediation for all disputes, and an arbitration clause for fee disputes only).
  • Verify the efficacy of limitation-of-liability clauses.
  • Consult your risk advisor or lawyer to confirm the enforceability of the engagement letter.


Engagement letters should not include …
Marketing information. Defer promotional information and other forms of marketing to other documents. You should view the engagement letter as a contract and compose it accordingly. It is not the place to convince a client that your firm is the answer to all their problems. An engagement letter limits, rather than sells, your services. Wording such as, "We are particularly suited for this type of work" may be appropriate for a proposal letter but not for an engagement letter.

All-encompassing language. Because an engagement letter limits the scope of your firm's work, avoid superlatives and absolutes. For example, use words such as "notice, examine, follow, observe, study, investigate, test, watch and comment on." However, avoid words and terms such as "all, every, analysis, any, absolute, complete, confirm, judge, determine, totally, thorough, validate and verify."

Legal jargon or ambiguity. Make the engagement letter easy for the client to understand. Don't use abbreviations or words only a CPA would understand. Any ambiguity in the engagement letter will most likely be decided in the client's favor in a court of law, so keep the language simple and clear.

Additional areas to consider
Avoid evergreen letters—update letters annually to reflect changes in the scope of the engagement.
Avoid usurious interest charges. Instead, assess a “late fee” for unpaid balances.

General engagement letter tips

  • Every engagement letter should include the full or exact name of the client, the entity type, the specific state names and tax years for tax engagements, and the purpose of engagement.
  • Review the letter with the client and get an agreement regarding the terms and conditions before beginning the work.
  • Update engagement letters whenever engagements change.


The best way to improve client communications and manage risk is to use a detailed engagement letter that the client understands and signs. A well-documented engagement, and a strong defense, begin with an effective engagement letter.

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