Mar 9 2023 /

How to Write an Engagement Letter: A Complete Guide to Putting One Together

How to Write an Engagement Letter
Lisa Chaud

Lisa Chaud

11 Min

An agreement that clearly states the expectations both for your clients and your firm is likely at the top of your mind. For the sake of stability, it is important to list the services you provide and how much these will cost — upfront.

This is where an accounting engagement letter comes in. Below we explain what an accounting letter is, why you should always have one and which mistakes you should avoid. And just so you also have a reference point, there’s a template at the bottom of the article you can use. First things first though.

What is an accounting engagement letter?

An engagement letter is a legally binding contract between you and a client. It outlines your relationship and defines crucial details, such as fees, scope of services and responsibilities.

Why you should always have an engagement letter

It’s a good idea to offer an accounting engagement letter to each client for several reasons. An engagement letter:

  • Outlines the scope of your work
  • Makes your agreement legally binding
  • Helps avoid misunderstandings
  • Prevents clients from asking for services which were not included in the letter

Last but not least, consider drafting separate engagement letters for different services – for the sake of clarity.

Engagement letter template

What to include in an accounting engagement letter

There are a couple of things you should consider when writing an engagement letter. Here are some of the most important things to keep in mind:


Outline them as clearly and thoroughly as possible. The main expectations include:

  • Timeline. Simply put, the most important milestones of the work you do — after the client signs, and provides, all the necessary documents.
  • Pricing. Fees and payment terms fall into this category. If you offer multiple services, make sure to provide a price breakdown for each.
  • Deadlines. When is your work due? You can also throw in stipulations that state the client must provide all the necessary documents before a certain date and time in order for the deadline to be met.
  • Scope. The scope of your work and the particular services you’re offering.

Outlining mutual expectations helps eliminate potential misunderstandings in the future.


Both you and your client will have certain responsibilities. The most likely ones are:

  • Client supplying accurate information
  • Client providing all crucial financial documents
  • Firm delivering reports and/or documents
  • And more, depending on individual circumstances

Your entire relationship with the client for the duration of you working together will be transparent and predictable — if you spend time outlining responsibilities.

Service Details

Your accounting firm may offer a variety of services to meet the needs of your clients. Detailing those services can help prevent misunderstandings and clarify expectations. When defining service details you can also include deadlines and fee structures.

If you find yourself looking for a convenient way to list the services you offer, TaxDome can help you out.

Want to learn more?

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You can easily draft and send contracts & engagement letters using TaxDome. Just ensure that both parties fully understand and agree to the services you offer by listing them. 

Other considerations when drafting an engagement letter

Update engagement letters annually

You should send new engagement letters every year, as the services you offer will surely evolve and change. Updating your letters to reflect these changes will also:

  • Limit your liability for prior years
  • Ensure all potential price increases are reflected
  • Exclude services you no longer offer — or your client doesn’t need

Make engagement letters part of client onboarding

Proper client onboarding is vital for both sides. And you can easily make the engagement letter part of the process with TaxDome.

After your clients are done signing up for our portal, you can send the letter as the last step of onboarding. Once it’s signed, you can start providing the services your client needs.

Throw in these little nuggets

You should consider adding some (or maybe all!) of these to your letter:

  • Your record retention policy (how long you store client info, where, and how you dispose of it when time’s up)
  • Consequences and fees arising from late payments
  • Mention that work results depend on the accuracy of info the client provides

What to avoid when writing an engagement letter

Customer experience and satisfaction is the order of the day: so we went ahead and rounded up some mistakes you’ll want to avoid when writing an engagement letter.

Sending it in Google Docs

Google Docs is a great tool for collaboration but relying on it for engagement letters might not be the best idea. You can neither brand nor enable e-signing with Google Docs. However, you can do both of these when using TaxDome. Which leads us to the next point…

Forcing clients to use a wet signature

Physically signing a document is neither necessary nor user-friendly. When you force clients to print and sign your letter, they’ll put it off until they have free time. The ensuing waiting period will benefit no one.

Instead, enable your clients to e-sign documents via the client portal right after onboarding — by making use of our e-signing feature. You can use go with either a simple e-signature, or rely on knowledge-based authentication (KBA). The latter is needed for IRS-compliant signatures and will require your client to pass an identification check.

E-signing documents brings improvements in several key areas:

  • Security goes up by 40%
  • Productivity does likewise
  • Speed of signing increases by 35%

Adding “in effect” clauses

A contract should keep your liability current. If you have a contract that states it’s in effect until one party cancels it, this can lead to liability gaps. 

Using generic wordings

You should write an engagement letter using language that is succinct and precise. If the wording you rely on when describing the scope of your work is vague or broad, it will expand said scope. That might lead to disputes over what your accounting firm promised vs. what it eventually delivered.

Deploying jargon

Your client is unlikely to be familiar with legal or accounting jargon. As an accounting professional, it’s easy to forget that clients may not understand the abbreviations or complicated language in your engagement letter.

Therefore, make sure to review your letter and remove (or clearly explain):

  • Legal definitions 
  • Abbreviations
  • Terms only a CPA would know

Ensure your clients can read and understand the engagement letter in its entirety, and tweak the language if necessary.

Promoting your services

Some firms use engagement letters as a final sales push. However, we would advise against that: it’s a contract you are offering your clients, not a promotional flier. At best, your effort to sell additional services might look out of place. At worst, clients might think you are tricking them into paying extra for something that is not in line with what you discussed.

Final thoughts

An engagement letter is a legally binding document that protects both your firm and your client. It outlines the scope of the work you do, states the fees for your services, and incorporates mutual responsibilities and other important details. Done right, such a letter ensures a great customer experience, minimizes the risk of misunderstandings arising — and protects your firm from potential liability.

You should aim to avoid things such as sending the letter in Google Docs, making physical signing the only option, using vague language (or jargon), as well as making the letter a promotional tool.

We hope our piece will help you do exactly that. We want to wrap by providing a template engagement letter you can use — just make sure to consult a legal expert when finalizing it.

An accounting engagement letter template

Below you can find TaxDome’s accounting letter sample. We have dozens more where this one came from — and that’s just one of the cool things we offer for accounting, bookkeeping and tax firms. Check out how you can grow and automate your practice below.

[COMPANY NAME] 2023 Letter of Engagement 

This letter is to confirm and specify the terms of our engagement with you and to clarify the nature and extent of services we will provide.

We will perform the following services for you each month.

  1. Record cash receipts/income from your daily cash reports and/or bank deposits
  2. Record cash disbursements/expenses
  3. Record any adjusting entries needed in records initially compiled and maintained by you
  4. Reconcile bank statements
  5. Prepare vendor and/or payroll checks for your signature
  6. Review and prepare your payroll records
  7. Post earnings record to ledger
  8. Prepare payroll tax returns
  9. Other bookkeeping services (specify)

At year end we will perform the following additional services for you

  1. Prepare W-2’s and W-3’s
  2. Prepare 1099’s

We will not audit or review your financial statements as those terms are defined in generally accepted auditing standards or any other accounting documents and information you provide. We will not verify the data you submit for accuracy or completeness. Rather, we will rely on the accuracy and completeness of the documents and information you provide to us.

You are responsible for designing and implementing controls to prevent and detect fraud and informing us about all known or suspected fraud impacting the company. In addition you are responsible for identifying and ensuring that the entity complies with applicable laws and regulations.

Our engagement cannot be relied on to disclose errors, irregularities, or illegal acts, including fraud or embezzlements, that may exist. However, we will inform the appropriate level of management specifically designated by you, of any material errors that come to our attention and any irregularities or illegal acts that come to our attention, unless they are clearly inconsequential.

In order for us to complete this engagement in a timely and efficient manner we require unrestricted access to all documents concerning your financial transactions including but not limited to bank statements, canceled checks, summaries of deposits and sales, a listing of accounts payable and accounts receivable, leases, loans and any other financial information necessary that impacts your accounting records. If you keep records in QuickBooks or other accounting software you agree to have the most current updates, patches, etc., such that your system will be compatible with the current operating system standards. Our fee for these services will be based upon the amount of time required at our standard billing rates, plus out-of-pocket expenses. All invoices are due and payable upon presentation.

Our maximum liability to you arising for any reason relating to services rendered under this letter shall be limited to the amount of fees you paid for these services. In the event of a claim by a third party relating to services under this letter, you will indemnify us from all such claims, liabilities, costs and expenses, except to the extent determined to have resulted from our intentional or deliberate misconduct.

If any dispute arises (between/among) the parties hereto, the parties agree first to try in good faith to settle the dispute through non-binding mediation. The costs of mediation shall be shared equally by the parties.

The parties agree that, if any dispute cannot be settled through mediation, the dispute may then be brought before a court of competent jurisdiction, but the matter will ultimately be decided by the court, sitting without a jury. The parties recognize they have knowingly and voluntarily agreed to waive all rights to have any such dispute determined by a jury, but otherwise retain all rights afforded under the applicable civil justice system. 

This Agreement, and the rights and obligations of the Parties hereunder, shall be governed by and construed in accordance with the laws (enter state or other jurisdiction) (without giving effect to its provisions on conflict of laws).

This Agreement is fully and voluntarily entered into by the Parties. Each Party states that he, she, or it has read this Agreement, has obtained advice of counsel if he, she, or it so desired, understands all of this Agreement, and executes this Agreement voluntarily and of his, her, or its own free will and accord with full knowledge of the legal significance and consequences of this Agreement.

To confirm that you agree with the services and terms of this engagement, please sign electronically. Should you have any questions regarding these requirements or provisions, please feel free to contact us.

Tax filing and audit engagement letter samples

Besides a general accounting engagement letter, there are two other types that are popular in the industry: tax and audit engagement letters. So we went ahead and found some neat examples, just in case you get stuck on either one of those.

Lisa Chaud

Lisa Chaud

Lisa is a marketer at TaxDome. As someone who strives to provide the TaxDome community with the freshest data, she dives deep when conducting market research for accounting and bookkeeping industries. Her enthusiasm for all things accounting is matched only by her dedication to leading a physically active lifestyle that includes dancing and running.

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