APES 305 Terms of Engagement: what your engagement letter must cover

What APES 305 requires

APES 305 *Terms of Engagement* is the professional standard that requires an accountant in public practice in Australia to document and communicate the terms of each engagement to the client before, or when, the work begins. In practice that almost always means an engagement letter — though the standard does not mandate a letter specifically.

The standard is issued by the Accounting Professional & Ethical Standards Board (APESB), the body that sets ethical and professional standards for members of CPA Australia, Chartered Accountants Australia and New Zealand (CA ANZ), and the Institute of Public Accountants (IPA). Because the professional bodies adopt APESB standards into their by-laws, compliance with APES 305 is effectively mandatory for members in public practice — not optional best practice.

The short version: if you provide a professional service to a client, you must set out what you will do, on what basis, and what the client's responsibilities are — in writing or another retrievable form — and you must keep those terms current.

Who APES 305 applies to

APES 305 applies to Members in Public Practice as that term is defined in the APESB framework — broadly, members offering professional services to the public for reward, whether as principals, partners, directors or sole practitioners of a firm.

It covers the full range of public-practice work, including:

• Tax return preparation and tax advice
• Bookkeeping, compilation and management accounting
• Audit and assurance engagements (read alongside the auditing standards)
• Self-managed superannuation fund (SMSF) administration and audit
• Advisory, valuation and other professional services

Members outside Australia must apply APES 305 to the extent that local laws and regulations are not contravened. Members in business (employed in industry, not offering services to the public) are generally outside its scope, though other APES standards still apply to them.

What your engagement document must cover

APES 305 sets out the matters the engagement document should address. The exact contents will vary with the nature and complexity of the work, but a compliant engagement letter typically covers:

• The objective and scope of the engagement — precisely what service is being provided, and just as importantly, what is *not* included.
• The respective responsibilities of the Member and the client — for example, the client's responsibility to provide complete and accurate records and to disclose relevant information.
• Any limitations on the scope of the work and the form of any report or output to be issued.
• The basis on which fees are calculated and billing arrangements, including disbursements and payment terms.
• Reference to the professional standards and ethical requirements that govern the work, including independence where relevant.
• Ownership of, and access to, working papers and records, and arrangements for confidentiality and the handling of client information.
• Use of the client's information, third parties, outsourcing or cloud providers where applicable.

Treat the list above as a checklist of substance rather than a fixed template. Always confirm the current wording of the requirements against the APESB standard itself, as the specific contents can change between revisions.

Form, timing and recurring engagements

Form. APES 305 does not require a formal "letter". The terms can be communicated in any clear, retrievable form — an engagement letter, a brochure, a handout, a portal acceptance or another electronic communication — provided the substance is documented and the client has agreed. What matters is that the terms are recorded and capable of being relied on later.

Timing. The terms should be documented and communicated at the outset of the engagement. Establishing terms before the work starts is the point — it manages expectations and reduces the risk of disputes about scope and fees down the track.

Recurring engagements. Many public-practice relationships run year after year (annual tax returns, ongoing bookkeeping, recurring audits). APES 305 addresses the Member's responsibilities for these recurring engagements. You do not necessarily need a brand-new letter every year, but you do need to periodically review whether the existing terms remain appropriate and reissue or update them when circumstances change — for example, a change in the nature of the work, the fee basis, the client's structure, legislation, or the standard itself. A common compliant approach is a standing engagement letter that states it continues to apply until amended or replaced.

How APES 305 fits with the broader APES framework

APES 305 does not operate in isolation. It sits within the APESB suite of standards, all of which are anchored by APES 110 Code of Ethics. The Code sets the fundamental principles — integrity, objectivity, professional competence and due care, confidentiality, and professional behaviour — that the engagement terms help give practical effect to.

For example:

• The confidentiality and client-information provisions you document under APES 305 support the confidentiality principle in APES 110.
• Referencing independence in an assurance engagement letter supports the objectivity and independence requirements in the Code.
• Clearly scoping the work supports professional competence and due care.

Specific service standards (for example, those covering compilation, tax services, insolvency, valuation and forensic work) may impose additional engagement-documentation expectations on top of APES 305. Where you act for clients on tax matters, you will also have obligations as a registered tax practitioner under the Tax Agent Services regime, which sits alongside — not instead of — your APESB obligations.

Common pitfalls

• No engagement letter at all for long-standing clients — a frequent finding in professional-body quality reviews, particularly for "informal" or family clients.
• Stale terms that were never updated after the scope, fees or the client's circumstances changed.
• Vague scope that fails to spell out exclusions, leaving the firm exposed when the client assumes a service was covered.
• Silence on responsibilities — not stating that the client is responsible for the accuracy and completeness of the information provided.
• Ignoring recurring-engagement reviews — setting and forgetting a letter from years ago.
• Outsourcing and cloud gaps — failing to disclose that work or data may be handled by third parties or stored offshore.

What to do now

If you are in public practice, take these practical steps:

1. Confirm the current version. Check the live standard on the APESB website to ensure your templates reflect the most recent revision and its effective date (verify the current commencement date with APESB, as the standard has been revised more than once).
2. Audit your client list. Identify every engagement and confirm each has documented, current terms.
3. Refresh your template against the contents checklist above and align it with APES 110.
4. Set a review cadence for recurring engagements so terms are re-confirmed when circumstances change.
5. Keep evidence of client acceptance — a signed letter, a portal acknowledgement, or a clear electronic record.

Done well, APES 305 compliance is more than a tick-box exercise: clear engagement terms are your firm's first and best line of defence in a fee or scope dispute.