Why Engagement Letters Matter
Engagement letters are one of the most important—but often overlooked—documents in accounting, clearly defining the scope of work, responsibilities, and expectations between an accountant and their client.
and Why We Issue One Every Year…
An engagement letter sets out the terms of an audit or review, including scope, responsibilities, and fees. For incorporated associations, it plays a key role in managing risk, supporting compliance, and ensuring clarity before financial reporting work starts.
One comment I hear increasingly from new clients is:
“We’ve never received an engagement letter before.”
That statement always surprises me — because for audit and review engagements, an engagement letter is not optional, and they must be done every year.
This isn’t about formality or paperwork for its own sake. Engagement letters exist for one reason: clarity. They protect the client, the committee, and the accountant by ensuring everyone understands exactly what has been agreed.
And importantly, this isn’t just my view.
What the Quality Reviews Are Telling Us
Chartered Accountants Australia and New Zealand regularly publishes the results of its Quality Assurance (QA) reviews across Australian firms.
One of the most common findings, year after year, is this:
“No engagement letter, or an engagement letter that does not include all required information.”
In other words, even among professional firms, failure to properly agree and document the terms of an engagement is a known compliance weakness.
That alone tells us how critical engagement letters really are.
What an Engagement Letter Actually Does
An engagement letter is not just a signature exercise. It formally documents:
What service is being performed (audit, review, or other assurance)
What period is covered
Who is responsible for what
What standards apply
What is not included
The agreed fee and timing
Independence and ethical safeguards
Without this, assumptions creep in — and assumptions are where disputes start.
Why It Must Be Issued Every Year
A very common misconception is:
“We signed one years ago — doesn’t that still apply?”
No.
Each year is a separate engagement, even if:
The organisation is the same
The accounting records look similar
The auditor hasn’t changed
Why?
Because things change:
Committee members change
Financial size and risk change
Reporting requirements change
Independence considerations change
Professional standards require that the terms be agreed and confirmed for each engagement period.
That is why I issue a new engagement letter every year — without exception.
Why “We Never Got One” Is a Red Flag (Not a Criticism)
When a new client tells me they’ve never seen an engagement letter, it usually means one of three things:
It was issued but never properly explained, or
It was signed years ago and forgotten, or
It genuinely was never issued
None of those situations serves the committee well.
An engagement letter is often the only document that clearly explains:
Why are certain documents requested
Why certain work can’t be done
Why does independence limit what assistance an auditor can provide
Why additional work may require a separate engagement
Without it, frustration builds on both sides.
Engagement Letters Protect Committees
For volunteer committees in particular, an engagement letter provides something very important:
A written record of what you agreed to — and what you didn’t.
If questions arise later (from members, regulators, or funders), the engagement letter shows:
The scope was appropriate
The responsibilities were properly allocated
The auditor did not assume management’s role
That protection matters.
Why We Don’t Start Work Without One
From a professional and ethical standpoint, starting work without a signed engagement letter poses a risk to everyone involved.
That’s why my position is simple and consistent:
No signed engagement letter, no commencement of work.
Not because it’s bureaucratic — but because it’s the foundation of a proper, independent assurance engagement.
Engagement letters are not about control. They’re about clarity, protection, and professionalism.
The fact that engagement letters continue to appear as a top quality issue in Chartered Accountants’ QA reviews tells us this is not a minor administrative detail — it is a core requirement of good practice.
If you’ve never seen one before, or don’t remember signing one recently, that’s not a criticism — but it is a conversation worth having.
Technical note for auditing students: engagement letters, client acceptance and ASA 210
For auditing students, engagement letters are not just administrative documents — they are the final step in the client acceptance and continuance process and form the contractual foundation of every audit.
Before an engagement letter is issued, the auditor must determine whether it is appropriate to accept or continue the client relationship.
Client acceptance and continuance decisions
The audit begins with assessing whether the auditor should act for the client at all.
Key considerations include:
the integrity and reputation of the client, management and those charged with governance
the client’s attitude to internal controls and financial reporting
the client’s willingness to provide full access to information
the appropriateness of accounting policies and judgements
the client’s attitude toward audit fees and audit quality
Information is gathered through discussions with management, third parties (such as bankers and lawyers), review of public information, and — for new clients — communication with the previous auditor.
Under APES 110, if a prospective client refuses permission to communicate with the previous auditor, the engagement should generally be declined.
Ethical and independence considerations
Before accepting or continuing an engagement, auditors must also assess compliance with the fundamental ethical principles:
integrity
objectivity
professional competence and due care
confidentiality
professional behaviour
If there are concerns about dishonesty, aggressive accounting practices, or illegal activity, the auditor should not accept the engagement.
Independence must also be considered. For example, excessive reliance on one client’s fees (fee dependence) may create a threat that cannot be reduced to an acceptable level.
Legal considerations: Corporations Act
In Australia, the Corporations Act 2001 also influences acceptance decisions.
An auditor must not accept or continue an engagement where a relevant relationship exists, such as:
being an officer or employee of the client
having a financial interest in the client
having close employment or partnership relationships with key personnel
These rules reinforce independence and prevent conflicts of interest.
ASA 210: agreeing the terms of the audit
Once the auditor decides to accept or continue the client, the next step is governed by ASA 210 Agreeing the Terms of Audit Engagements.
The standard requires the auditor to only accept an engagement where:
the preconditions for an audit are present
there is a clear understanding between the auditor and management
These preconditions include confirming that management:
prepares the financial report in accordance with an acceptable framework
maintains appropriate internal control
provides the auditor with access to all necessary information
As outlined in ASA 210, the auditor must establish these conditions before proceeding with the audit.
The engagement letter: purpose and content
The engagement letter formalises the agreement between the auditor and the client.
Its primary purpose is to avoid misunderstandings about the audit.
Under ASA 210, the engagement letter typically includes:
the objective and scope of the audit
the responsibilities of the auditor
the responsibilities of management
the applicable financial reporting framework
the expected form and content of the auditor’s report
The example engagement letter in Appendix 1 of ASA 210 (pages 23–26) illustrates how these elements are presented in practice, including clear statements of management responsibility and the auditor’s role in forming an opinion.
Why engagement letters matter in practice
From a technical perspective, engagement letters:
establish the legal and professional contract between auditor and client
clarify that management — not the auditor — is responsible for the financial report
reinforce the auditor’s right of access to information
document independence and ethical considerations
reduce audit risk by preventing scope misunderstandings
They also support audit quality by ensuring both parties understand their roles before audit work begins.
Key takeaway for students
Engagement letters are not just paperwork — they are the culmination of client acceptance, ethical assessment and independence evaluation.
In simple terms:
If the engagement letter is unclear or inappropriate, the audit itself is built on weak foundations — regardless of how well the audit is performed.