Letter of Engagement for Accountants Explained

Team Nomi

Jul 24, 2026
7 minutes read

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Starting work with a new client without a clear agreement can cause confusion about the services, fees, and responsibilities. 

A Letter of Engagement is a written agreement between an accountant and a client. It helps avoid these problems by clearly explaining what both the accountant and the client have agreed to before any work begins. It sets clear expectations and helps build a professional working relationship. 

Whether you are an accountant or a business owner, understanding a Letter of Engagement is important. It helps prevent misunderstandings, improves communication, and protects both parties.

What is a Letter of Engagement in accounting?

A Letter of Engagement is a written agreement between an accountant and a client. It explains the accounting services that will be provided and sets clear expectations before any work begins.

The letter usually includes details such as the services being offered, fees, payment terms, deadlines, and the responsibilities of both the accountant and the client. It may also explain how confidential information will be handled and how the agreement can be ended if needed.

According to HMRC, a Letter of Engagement should clearly set out the agreed terms between the accountant and the client, including the responsibilities of both parties.

What is the purpose of a Letter of Engagement?

The main purpose of a Letter of Engagement is to clearly explain the agreement between an accountant and a client before any work begins. It outlines the services to be provided, the responsibilities of both parties, the fees, and other important terms.

A Letter of Engagement helps avoid misunderstandings by making sure everyone knows what is included in the agreement.

It also protects both the accountant and the client if any questions or disputes arise later. Overall, it helps build trust, improves communication, and creates a professional working relationship from the start.

What should a Letter of Engagement include?

Although every accounting firm may have its own format, most Letters of Engagement include the same key details. These sections help both the accountant and the client understand what has been agreed before work begins.

Scope of services

The scope of services is one of the most important parts of the engagement letter. It clearly explains the work the accountant will carry out.

This section should include:

• • The services being provided
  • The work that will be completed
  • Any services that are not included

Clearly defining the scope helps avoid misunderstandings and prevents clients from expecting additional work that is outside the agreement.

Client responsibilities

This section explains what the client is responsible for during the engagement. The accountant relies on the client to provide accurate and complete information.

Client responsibilities may include:

• • Providing complete and accurate financial information
  • Sharing documents on time
  • Informing the accountant about important business or financial changes
  • Reviewing and approving tax returns or financial statements before they are submitted

Accountant’s responsibilities

The engagement letter should clearly explain what services the accountant will provide.

These may include:

• • Preparing annual accounts
  • Filing tax returns
  • Managing bookkeeping
  • Processing payroll
  • Preparing and submitting VAT returns

It should also explain any limits to the accountant’s responsibilities so both parties understand what is and is not covered.

Fees and payment terms

The engagement letter should clearly explain how much the services will cost and when payment is expected.

This section usually includes:

• • Agreed service fees
  • Payment methods
  • Payment due dates
  • Charges for additional work outside the agreed scope
  • Late payment terms, if applicable

Clear payment terms help avoid disputes later.

Timelines and Deadlines

The letter should outline important dates and expected turnaround times for the work.

This may include:

• • Expected completion dates
  • Tax filing deadlines
  • Dates by which the client must provide information or documents

Setting clear timelines helps both the accountant and the client stay on track.

Confidentiality

Accountants handle sensitive financial and personal information. The engagement letter should explain how this information will be kept secure and used only for the agreed services.

This gives clients confidence that their information will be handled responsibly.

Termination of the agreement

The engagement letter should explain how either the accountant or the client can end the agreement if needed.

This section may include:

• • The notice period required
  • Payment of any outstanding fees
  • Return of client documents and records
  • Any remaining responsibilities after the engagement ends

Having clear termination terms helps both parties understand the process if the professional relationship comes to an end.

Benefits of using a Letter of Engagement

A Letter of Engagement offers several benefits for both accountants and clients. It helps create a clear and professional working relationship from the beginning.

1. Sets Clear Expectations: It clearly explains the services being provided, helping both parties understand what is included in the agreement.
2. Reduces Misunderstandings: A written agreement helps avoid confusion about services, deadlines, responsibilities, and fees.
3. Protects Both Parties: If any questions or disputes arise, the engagement letter provides a written record of the agreed terms.
4. Builds Trust: Being transparent about services and fees helps build confidence and strengthens the client relationship.
5. Improves Communication: The letter clearly defines the responsibilities of both the accountant and the client, making communication easier throughout the engagement.
6. Helps Manage Risk: Clearly defining the scope of work reduces the risk of clients expecting services that were not agreed upon.
7. Creates a Professional Process: Using a Letter of Engagement shows that the accounting firm follows a structured and professional approach when working with clients.

How Nomi simplifies Letter of Engagement management

Creating engagement letters manually can take time, especially when managing multiple clients.

Nomi’s Letter of Engagement feature helps accountants create, send, manage, and track engagement letters directly within its practice management system.

Some of the key features include:

• • Create professional quotes and contracts in just a few clicks
  • Send engagement letters directly from the CRM
  • Built-in electronic signatures for faster approvals
  • Track the status of every agreement, including sent, pending, signed, or unsent
  • Monitor the signed value of client contracts
  • Keep all engagement letters organised in one place

Instead of managing paperwork manually, accountants can smooth the entire client onboarding process while maintaining better visibility over every agreement.

Conclusion

A Letter of Engagement is much more than a formality. It creates a strong foundation for a professional relationship by clearly explaining services, responsibilities, fees, and expectations.

Whether you are working with individuals, sole traders, or large companies, having a well-prepared engagement letter helps reduce misunderstandings, improve communication, and protect both parties.

With Nomi, you can experience the best version of a Letter of Engagement. To increase your accounting experience, a 30 day free trial. 

Frequently asked questions

1. Who prepares a letter of engagement?
   Ans: A letter of engagement is usually prepared by the accountant, accounting firm, or service provider. It explains the services they will provide, the responsibilities of both parties, the fees, and other important terms before the work begins.

2. Who issues an engagement letter?
   Ans: The engagement letter is issued by the accountant or professional service provider to the client. The client reviews the letter, agrees to the terms, and signs it before the work starts.

3. How do I write an effective engagement letter?
   Ans: To write an effective engagement letter, clearly describe the services you will provide, your responsibilities, the client’s responsibilities, the fees, payment terms, deadlines, and any other important conditions.

4. Why do accountants use engagement letters?
   Ans: Accountants use engagement letters to clearly define the scope of work, avoid misunderstandings, protect both parties, and establish professional expectations.