An engagement letter is the most important document in the client relationship. It defines what you’ll do, what you won’t do, what it costs, and what happens if things go wrong. Without one you’re exposed to scope creep, billing disputes, and professional liability, all of which are preventable with two pages of clear terms signed before the work starts.
This page gives you a complete engagement letter template you can copy or download, a generator that assembles the letter for your region, services, and fee structure, and service-specific versions for bookkeeping, tax preparation, and general accounting work.
The engagement letter template
[Your firm letterhead]
[Date]
[Client name] [Client address]
Re: Engagement letter for professional services
Dear [Client name],
Thank you for choosing [Your Firm Name] to provide professional services to [Client / entity name]. This letter confirms our understanding of the terms and objectives of our engagement, effective [start date].
Scope of services. We will provide the following services: [list each service specifically, e.g. monthly bookkeeping including categorisation of up to [X] transactions per month; preparation and filing of the annual income tax return with the [IRS / ATO / HMRC / IRD / CRA]; quarterly [sales tax / BAS / VAT / GST] preparation and filing].
Services not included. This engagement does not include [payroll processing, tax planning or structuring advice, audit or assurance work, legal or investment advice]. Any work outside the scope described above will be quoted and agreed separately before it begins.
Fees and payment. Our fee for the services above is [$[amount] per month / $[amount] per engagement / billed at $[amount] per hour, invoiced monthly in arrears]. Invoices are payable within [14] days. Work outside the agreed scope will be billed at $[amount] per hour, quoted first where practical.
Your responsibilities. You agree to provide complete and accurate information and records, respond to queries within [5] business days, and provide access to [accounting software / records] as needed. Late or incomplete information may result in delayed deliverables, missed filing deadlines, or additional fees, and any resulting penalties remain your responsibility.
Term and termination. This engagement is ongoing from [start date] and may be terminated by either party with [30] days written notice. On termination, fees for work performed become immediately payable.
Confidentiality. We will treat all information you provide as confidential, except where disclosure is required by law or professional obligations, and we will handle personal information in accordance with applicable privacy law.
Limitation of liability. Our liability under this engagement is limited to the total fees paid in the [12] months preceding any claim. We are not responsible for loss arising from inaccurate or incomplete information provided by you.
Acceptance. Please sign below to confirm your acceptance of these terms. If you have any questions, contact us before signing.
______________________________ ______________________________ [Your Name], [Your Firm Name] [Client Name], [Client Business Name]
Date: __________________ Date: __________________
What to include in an engagement letter
Whatever the service, a strong engagement letter covers eight things:
- Parties. Full legal names of your firm and the client entity, and who is authorised to sign.
- Scope of services. Exactly what’s included. “Accounting services” means different things to different people; “monthly bookkeeping including categorisation of up to 200 transactions” doesn’t.
- Exclusions. What’s not included matters as much as what is. This is the clause that ends scope creep before it starts.
- Fees and payment terms. The fee structure, billing cadence, payment deadline, and what triggers additional charges.
- Client responsibilities. Deadlines for records, accuracy of information, response times, and who bears the consequences of late or missing information.
- Term and termination. How long the engagement runs and how either party ends it.
- Confidentiality and privacy. How you handle their information.
- Limitation of liability. Check your professional body’s guidance; a standard clause limits liability to fees paid or a reasonable multiple. Don’t skip it.
Service-specific engagement letter templates
The general template above works for most engagements. For the most common service lines, use the focused versions, each with scope, exclusions, and fee wording matched to the work:
- Bookkeeping engagement letter template for recurring monthly bookkeeping.
- Tax preparation engagement letter template for annual returns, re-issued each year.
- CPA engagement letter template for general accounting services and annual accounts.
For the agreement that sits around the engagement, see the client service agreement template, and when a relationship ends, the client termination letter template.
Common engagement letter mistakes
Being vague about scope. The five minutes it takes to list exclusions saves hours of scope-creep conversations later.
Not addressing late or missing information. If records arrive two months late, your letter should say who bears the consequences.
Never updating it. Services, fees, and regulations change. Re-issue at the start of each year or whenever scope changes materially; pair a fee increase with an updated letter.
Making it long and legalistic. A clear two-page letter both parties understand beats a ten-page document nobody reads. If your professional body requires detailed terms, attach them as an appendix.
Starting work before it’s signed. The most common mistake of all. Make it firm policy: no signed letter, no work. Electronic signatures remove the friction, clients sign from their phone in under a minute.
How to get engagement letters signed faster
Friction is why letters sit unsigned. Send for e-signature immediately rather than attaching a PDF to print and scan, make the letter the first step of your client onboarding checklist, and follow up after three business days. An unsigned engagement letter is a ticking liability.
Send engagement letters that get signed in Tidyflow
In Tidyflow, proposals and engagement letters live where the work does. Build reusable letter templates for the services you sell, send them for electronic signature, and carry the agreed scope and fees straight into the client’s recurring jobs and billing, with nothing re-keyed.