Anja Pich is a commercial lawyer and the Managing Lawyer at Lawpath. She practises across all areas of commercial law and advises businesses of every size, from first-time founders to established companies, on their legal, regulatory and commercial needs.
Table of Contents
An engagement letter (also called a letter of engagement) is a short written agreement that confirms what a service provider will do for a client, what it costs and how the working relationship runs, before any work starts. Once the client signs or clearly accepts it, an engagement letter is usually a binding contract in Australia.
Most small service businesses skip it. The client seems lovely, the job seems simple, and sending paperwork feels like it might scare them off. Then the scope grows, an invoice lands badly, and nobody can prove what was agreed. A one-page letter sent on day one prevents almost all of that.
- An engagement letter is usually a contract. Once the client signs or clearly accepts it, the scope and fees in it bind both sides. Email and e-signature acceptance both work.
- Scope and exclusions do the heavy lifting. Most engagement letter disputes are about what was “included”, not the quality of the work.
- Lawyers and accountants have extra rules. Lawyers in NSW, Victoria and WA must give written costs disclosure once a matter is likely to exceed $750. Tax agents are expected to reconfirm engagements every year.
- 2026 raised the stakes for professional firms. Since 1 July 2026, firms providing AML/CTF “designated services” carry new obligations, and your scope clause shows which side of the line you sit on.
- Template terms must be fair. Since November 2023, unfair terms in standard form letters sent to consumers or small businesses can attract heavy penalties.
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What is the purpose of an engagement letter?
An engagement letter forces the awkward conversations to happen early. Price, scope, deadlines and who does what all get settled while everyone is still friendly.
Day to day, a letter of engagement does four jobs:
- Pins down the scope. “Can you just quickly…” requests become paid variations instead of free extras.
- Sets payment terms. A late invoice has consequences you both agreed to in advance.
- Names the actual client. This matters more than people expect when a founder, their company and their family trust all sit in the same email chain.
- Creates evidence. If a dispute reaches a tribunal or your insurer, the engagement letter is the first document anyone asks for.
Here’s the part most founders miss. Bad clients cause some disputes, but good clients cause most scope creep, because they trust you and keep asking. Your letter gives you a polite, pre-agreed way to say “happy to, here’s the quote”.
Is an engagement letter legally binding in Australia?
Usually, yes. An engagement letter becomes a binding contract when it has the normal ingredients: an offer, acceptance, something of value exchanged (your services for their fee) and an intention to be legally bound. Calling it a “letter” doesn’t make it optional.
Acceptance doesn’t need wet ink. An e-signature or a clear reply email (“Agreed, please go ahead”) counts. Clients sometimes accept by conduct too, for example by telling you to start after seeing the terms. That’s a weak position to argue from, though. Get it in writing.
Vagueness is where letters fall over. A scope of “marketing support as needed” or a fee “to be discussed” gives a court very little to enforce. If you can’t explain the deliverables to a stranger in two sentences, the letter isn’t finished.
Engagement letter vs engagement agreement vs services agreement: which do you need?
People use these names loosely. Searches for “engagement agreement” or “engagement contract” usually mean the same thing as an engagement letter. All three can be binding contracts. What separates them is length and depth.
| Document | Best for | Typical length | Watch out for |
|---|---|---|---|
| Engagement letter | Professional and advisory work with a clear scope: accountants, consultants, agencies, lawyers | 1 to 4 pages, plus attached standard terms | Thin on IP, warranties and liability unless you attach terms |
| Engagement agreement or contract | The same work, set out in contract format | 3 to 10 pages | Often just a longer letter, so check what actually differs |
| Services agreement | Higher-value, ongoing or riskier work such as software builds, managed services or multi-party projects | 8 to 25+ pages | Slower to negotiate and overkill for a small one-off job |
Our view: start with an engagement letter plus one set of standard terms you reuse with every client. Step up to a full services agreement when the work runs longer than a few months, involves building something the client will own, or touches other people’s personal information at scale.
Unsure where consulting work fits? Our guide to the difference between a services agreement and a consultancy agreement breaks it down.
What should an engagement letter include?
A good engagement letter answers ten questions your client would otherwise ask halfway through the job. Keep the letter itself short and push the boilerplate into attached terms.
1. Who exactly is the client?
Use the full legal name and ABN or ACN of the entity you’re working for. A sole director and their company are two different clients, and only one of them may end up liable for your invoice. Working for a group? Name each entity, or issue separate letters.
2. What’s in scope, and what isn’t?
List deliverables, not activities. Prepare and lodge the FY26 company tax return” beats “tax services. Then add an exclusions list. No other clause protects you more, because it turns arguments into quotes.
3. What does the client have to do?
Spell out the information, access and approvals you need, and by when. Add what happens if they don’t deliver: deadlines move, and extra time is billable. Without this clause, their delay becomes your problem.
4. How much, and when do they pay?
State the fee model (fixed, hourly, retainer or milestones), when you invoice and when payment is due. Include a right to pause work on overdue accounts. Fixed fees with a tight scope get paid faster than hourly estimates in our experience, because nobody gets surprised.
5. How do changes get agreed?
Set a simple variation process. Any extra work gets quoted and approved in writing (email is fine) before you start. Sounds bureaucratic? This is the clause that lets you say yes to new work without resenting it.
6. How does the engagement end?
Give both sides an exit on notice, plus an immediate right to end for serious breach or non-payment. Say what happens on exit: fees for work done to date, handover of files, and which obligations survive. Rolling engagements need a review date too.
7. Confidentiality and personal information
Commit to keeping client information confidential and explain how you’ll handle personal information. Whatever your privacy policy promises, your engagement letter should say the same thing.
8. Who owns the work?
Founders assume that paying for something means owning it. For work done by a contractor or firm, copyright stays with the creator unless the contract transfers it. Decide whether the client gets ownership, or a licence to use the deliverables while you keep your templates and know-how.
9. Liability limits
Most professional letters cap liability, commonly at the fees paid, and exclude indirect loss. That’s reasonable. Excluding liability for your own negligence entirely, in a template you send to small businesses, is asking for trouble. Keep the cap proportionate (more on this below).
10. How does the client accept?
End with a signature block or a clear instruction such as “Reply ‘I accept’ or sign via the link”. Then don’t start until that comes back.
Example engagement letter clauses you can adapt
Three clauses do most of the work in any letter of engagement. Adapt the wording to your business, and get a lawyer to check anything high value.
Scope exclusions
Our services do not include: (a) advice on anything outside Australian tax law; (b) responding to ATO audits or reviews; (c) bookkeeping or data entry; or (d) any work not listed in Schedule 1. If you’d like help with any of these, we’ll quote separately.
See the offer to quote at the end? It keeps the exclusion friendly and opens a sales conversation.
Variations
Any work outside the scope in Schedule 1 is a variation. We’ll give you a written quote and start only once you approve it in writing. Email approval is enough.
Allowing email approval keeps this fast enough that people actually use it.
Termination and exit
Either of us may end this engagement with 14 days’ written notice. We may end it immediately if an invoice is more than 30 days overdue. On termination, you’ll pay for work done up to the end date, and we’ll return your documents within 10 business days.
Mutual notice keeps the clause balanced, which matters for the unfair contract terms rules covered below.
What is a letter of engagement in law?
When a lawyer sends you a letter of engagement, it does double duty. It sets scope and fees like any engagement letter, and it usually carries the costs disclosure the law requires.
In NSW, Victoria and WA, the Legal Profession Uniform Law requires a law practice to disclose in writing how costs will be calculated and an estimate of total costs once a matter is likely to exceed $750 (excluding GST and disbursements). Between $750 and $3,000, a short standard form is enough. Above $3,000, full disclosure applies. Other states and territories have similar rules under their own legal profession laws.
Why should you, as the client, care? If a lawyer skips required disclosure, you don’t have to pay those costs until they’ve been assessed. Read the estimate, ask what triggers an updated one, and check what’s excluded. A fixed fee with a written scope is the easiest way to avoid bill shock.
What do accountants, bookkeepers and tax agents need in an engagement letter?
Accountants in public practice work under APES 305 Terms of Engagement, the professional standard covering what their engagement documents should contain. Tax and BAS agents answer to the Tax Practitioners Board. The TPB doesn’t strictly require a letter, but it takes one into account when assessing compliance with the Code of Professional Conduct.
Two practical rules follow. Issue a separate engagement for each entity you act for: the company, the trust and the individuals behind them. And reconfirm each engagement at least once a year, as the TPB recommends. Annual re-engagement is also the cleanest moment to adjust your fees.
Running a practice? Lawpath’s accountant letter of engagement template gives you a structured starting point you can tailor to your services in minutes.
How did the 2026 AML/CTF and privacy changes affect engagement letters?
Most guides haven’t caught up with this yet. From 1 July 2026, lawyers, accountants, conveyancers, real estate agents and trust and company service providers became regulated under Australia’s anti-money laundering regime when they provide certain “designated services”. Newly regulated businesses had to enrol with AUSTRAC by 29 July 2026.
Obligations follow the service, not the profession. Forming companies or trusts, handling client money and helping with property or business transactions can all trigger them. Routine tax returns and BAS work aren’t designated services on their own.
That puts your scope clause on the front line. A practice that wants to stay outside the regime needs a scope that clearly excludes designated services, plus a right to decline or pause work if a request drifts across the line. A captured practice needs its letter to cover customer due diligence: what identity and ownership information you’ll collect, and that you may refuse to act without it.
Privacy gets pulled in as well. Businesses under $3 million turnover are normally exempt from the Privacy Act 1988 (Cth), but an AML/CTF reporting entity loses that exemption for personal information it handles for AML/CTF purposes. If that’s you, your engagement letter and your privacy policy need to match.
One more 2026 shift: Chartered Accountants ANZ added guidance on AI use to its engagement letter tool in July 2026. A sentence explaining whether you use AI tools on client work, and how you protect client data when you do, heads off an awkward question later.
Do unfair contract terms rules apply to your engagement letter?
Sending the same letter to lots of clients on a take-it-or-leave-it basis? Then it’s probably a standard form contract. When the client is a consumer or a small business (fewer than 100 employees or under $10 million annual turnover), unfair terms in that contract are illegal.
Since 9 November 2023, courts can penalise businesses for proposing or relying on unfair terms, on top of striking them out. Penalties for companies reach $50 million or more per contravention. Our guide to the unfair contract terms penalty changes explains how the regime works.
Terms that attract attention in engagement letters include:
- A right for you to change fees or scope at any time, with no matching right for the client to walk away
- Termination rights for you but not the client
- Automatic renewals the client can’t easily exit
- Liability exclusions so broad they wipe out the client’s remedies
Fixing these rarely costs you anything real. Make rights mutual, give notice of fee changes with a right to exit, and keep liability caps proportionate.
What we see in Lawpath consultations
Lawpath lawyers review and draft engagement letters for accountants, consultants and founders across Australia. A few patterns keep coming up.
Small practices using scope to stay outside AML/CTF
In the lead-up to 1 July 2026, small accounting practices that only did tax returns, BAS and bookkeeping asked us to confirm they weren’t captured. What they asked for next was telling: an exclusion schedule listing the services they don’t provide, client responsibility clauses, and an express right to pause or decline work. For these firms, the engagement letter turned into compliance evidence as well as fee terms.
Founders signing adviser letters with long tails
Founders don’t only send engagement letters. They receive them, often from capital-raising or corporate advisers. A pattern we see is a multi-year “tail” or exclusivity period that entitles the adviser to fees on future raises they had no part in, plus an overseas governing law and arbitration clause.
Both are negotiable. Asking to shorten the tail to around 6 to 12 months, and to limit it to investors the adviser actually introduced, is a reasonable request. So is asking for Australian law to govern the agreement.
Letters and privacy policies drafted together
Practices that ask us to draft an engagement letter frequently want a privacy policy in the same brief. Good instinct. The confidentiality clause in your letter and the promises in your policy should say the same thing, and drafting them together is the simplest way to make sure they do.
How do you roll out engagement letters in your business?
You don’t need a big project. Most small businesses can have this running in an afternoon.
- Map your services. Group your work into two or three standard packages, each with its own scope and exclusions.
- Build one template plus standard terms. Job-specific details (scope, fee, timing) go in the letter. Reusable legal terms go in an attachment.
- Pick one way to accept. E-signature, a client portal or a reply email all work. Choosing one keeps your records consistent.
- Set a rule: no acceptance, no work. This single habit prevents most fee disputes.
- Diary a review. Revisit your template once a year, or sooner if your services or the law change, as they did for professional firms in 2026.
Which engagement letter mistakes cost businesses the most?
- Sending the letter after work starts. By then the client feels the terms are being imposed, and you’ve lost your bargaining power.
- Copying an old contract. Legacy clauses that don’t match your current services leave gaps.
- Leaving key terms undefined. Words like “reasonable”, “standard” or “complete” mean different things to different people. Define them or drop them.
- Forgetting the letter is still live. An open-ended engagement signed years ago may still govern today’s work, old rates included.
- Skimming the other side’s letter. When you’re the client, read the scope and any tail clause before you sign, not after the invoice.
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Engagement letter FAQs
What is an engagement letter?
An engagement letter is a short written agreement that sets out the services you’ll provide, the fees, each side’s responsibilities and how the engagement ends. Once the client accepts it, it usually operates as the contract for the work.
Is a letter of engagement the same as an engagement letter?
Yes. “Letter of engagement”, “engagement letter” and “engagement agreement” describe the same document. Lawyers and accountants tend to say letter of engagement, while consultants and agencies more often say engagement letter.
Do I need an engagement letter if I’ve already sent a quote?
A quote covers price. An engagement letter also covers scope, exclusions, client responsibilities, payment terms and termination. Many businesses turn their quote into the letter’s fee section so the client signs one document.
Can I send an engagement letter by email?
Yes. Email is the most common way to send one. The client can accept by e-signature or by a clear written reply such as “I accept these terms”. Keep a copy of the acceptance with the client file.
Is an engagement letter legally binding?
In most cases, yes. If it includes an offer, acceptance, payment for services and an intention to be bound, it forms a contract. Vague scope or price terms make parts of it hard to enforce.
How long should an engagement letter be?
One to four pages is enough for most small businesses. Put the job-specific scope and fees in the letter and attach your standard terms for liability, IP, confidentiality and disputes.
Do lawyers have to give clients an engagement letter?
Lawyers in NSW, Victoria and WA must give written costs disclosure once a matter is likely to cost more than $750, excluding GST and disbursements. That disclosure usually sits inside or alongside the letter of engagement.
How often should accountants renew engagement letters?
The Tax Practitioners Board recommends reviewing and reconfirming engagements at least annually, and issuing a fresh letter whenever the services change. Annual renewal is also a natural time to review fees.
Can I change an engagement letter after it’s signed?
Only with the client’s agreement. Use a written variation, such as an email the client approves, that records the new scope or fee. Avoid clauses letting you change terms on your own, as they raise unfair contract terms risk.
What happens if there’s no engagement letter?
A contract may still exist through emails, quotes and conduct, but proving its terms gets much harder. Default legal positions apply, so the client may not own work they paid for unless copyright was transferred.
Ready to set up your engagement letter?
If you’ve been taking on clients without one, you’re not behind. Plenty of small businesses start with a quote and a handshake, then formalise things after a near miss. Sorting it now, while things are going well, is the easy version.
Start your Engagement Letter with Lawpath today. Answer a few questions, tailor it to your services, and send it for e-signature from the same place you keep the rest of your legal documents.
