What an Engagement Letter Should Cover

An engagement letter is a written agreement between you and an advisor that defines the relationship. A good one prevents misunderstandings by setting out what the advisor will do, what you will do, what it will cost, and what happens if things change. Many professionals use them as a standard practice. This guide describes the sections a good letter typically includes and how to review one.

Parties and Purpose

The letter should identify who is engaging the firm and who the firm is. If several people or entities are involved, such as spouses or a business and its owner, the letter should say who is a client. This matters for confidentiality, responsibility, and fees. The letter should also state the purpose of the engagement in plain terms.

Scope of Services

The scope is the heart of the letter. It should describe what the firm will do, such as prepare specific returns, analyze specific questions, provide planning meetings, or coordinate with other professionals. Look for specifics: which tax years, which entities, which states, how many meetings, and what deliverables. Vague phrases such as tax services as needed are a signal to ask for clarification.

Exclusions

A good letter states what is not included. Common exclusions include legal advice, investment advice, bookkeeping, payroll processing, responses to certain notices, representation in examinations, and services for tax years or entities not listed. Exclusions are not bad, but you should know them in advance. If something you expect is not mentioned, ask.

Client Responsibilities

The letter usually describes what you must do: provide accurate and complete information, respond to requests promptly, keep records, and review documents before filing. It may state that the firm relies on the information you provide and does not audit it. Understand these responsibilities, since failing to meet them can affect the work and the fees.

Fees and Billing

The letter should state how fees are calculated, when they are due, and what could change them. Look for the pricing model, any estimates, any thresholds that trigger additional charges, and billing frequency. Also check for late fees, interest, and expense reimbursement. See Tax Advisory Pricing Models Explained.

Timeline

The letter may describe expected timelines and dependencies, such as when documents are due and when deliverables will be ready. It may state that deadlines depend on your timely cooperation. If you have specific deadlines, such as a closing or a filing date, mention them and confirm that they are reflected.

Changes in Scope

A good letter explains how changes are handled. Typically, a change in scope requires a written amendment or an email confirmation, along with a revised estimate. That protects you from surprises and protects the firm from unpaid work.

Confidentiality and Data

The letter should describe how the firm handles your information, including confidentiality, security practices, and the use of outside vendors. It should also address record retention and the return of records. See Questions About Data Security and Privacy.

Limitations and Disclaimers

Letters often include statements that outcomes are not guaranteed, that advice is based on current law, and that changes in law may affect it. They may also limit the firm's liability in certain ways, subject to legal and professional rules. Read these carefully, and ask about anything you do not understand. If a limitation seems unusual, you may want your attorney to review it.

Termination

The letter should explain how either party can end the engagement, what notice is required, how work in progress is billed, and how records are returned. A clear exit provision is a sign of a professional arrangement.

Dispute Resolution

Some letters include provisions on how disputes are resolved, such as through mediation or arbitration. Understand what you are agreeing to. If it is unclear, ask for an explanation or consult an attorney.

How to Review One

Read the whole letter. Highlight the scope, exclusions, fees, and termination sections. Write down questions. Compare it with other proposals. Do not sign until you are comfortable. Keep a signed copy with your records.

A Short Review Checklist

Before signing, confirm that the letter names the right parties, that it lists the tax years and entities covered, that it states the fee and billing terms, that it lists exclusions, that it explains how changes are handled, that it describes confidentiality and record retention, and that it explains how to end the engagement. Confirm that the signature block matches the people who will be responsible. Ask for a copy in a format you can save. If any answer is unclear, ask before you sign, and keep the email thread with the clarification.

Keep It Current

If your situation changes, such as adding an entity or a property, ask whether the letter should be updated. Keeping the letter current avoids confusion about whether new work is covered.

Educational purposes only. This page is general education and is not tax, legal, or accounting advice. Descriptions of how AE Tax Advisors approaches engagements are general, and the scope, timing, and fees for any engagement are confirmed with you directly. Tax laws change and outcomes depend on individual facts. No result is guaranteed.