C · Client onboarding & engagement
Engagement Letter Template for Accountants (UK, 2026)
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Quick answer
A usable accountancy engagement letter has a main terms-of-business section covering fees, responsibilities and liability, plus separate schedules for each service (accounts, tax, payroll, VAT) so you can mix and match per client without redrafting the whole document each time.
Key takeaways
- Structure letters as terms of business plus per-service schedules for flexibility.
- Always name the correct legal entity for both firm and client.
- Include a clear limitation of liability clause using your body's recommended wording.
- Cover data protection, retention and complaints handling as standard clauses.
- Review and reissue at least annually or whenever scope or entity changes.
- Generating and e-signing letters from a template cuts onboarding time significantly.
How should an engagement letter be structured?
Use a main terms-of-business document covering firm-wide clauses, then attach a schedule for each specific service so you only need to update the relevant schedule when a client's services change.
Drafting one monolithic letter per client, rewritten from scratch each time, wastes time and increases the risk of inconsistent wording. A terms-of-business-plus-schedules structure lets you standardise the legal boilerplate once and simply attach or remove schedules as a client's services change.
What goes in the terms of business section?
The terms of business section covers clauses that apply regardless of which services are engaged: parties, fees and billing, data protection, liability, termination and complaints.
- Parties: full legal name of the firm and the client, with registered/trading addresses.
- Applicable law and professional body regulation the firm operates under.
- Fees, billing frequency, payment terms and consequences of late payment.
- Client responsibilities: providing accurate, timely information.
- Firm responsibilities: acting with reasonable skill and care, confidentiality.
- Data protection: what data is collected, retention periods, and reference to the privacy notice.
- Limitation of liability clause and any liability cap.
- Termination rights and professional clearance process on disengagement.
- Complaints procedure and reference to the relevant professional body redress scheme.
- Signature block with date and confirmation of acceptance (including e-signature).
What should individual service schedules cover?
Each schedule should define the exact scope of that service, the respective deadlines and responsibilities, and any service-specific exclusions, so nothing is assumed to be included beyond what's written.
| Service | Key schedule contents |
|---|---|
| Annual accounts | Basis of preparation, filing deadline (9 months after year end for private companies), what's excluded (e.g. no audit) |
| Corporation Tax | CT600 preparation, computation basis, payment due 9 months + 1 day, filing due within 12 months |
| Self Assessment | Return scope, 31 January online deadline, payments on account (31 July second payment) |
| VAT | MTD software used, filing frequency, who submits and who approves before submission |
| Payroll | RTI submissions, P11D by 6 July if applicable, pension auto-enrolment responsibilities |
| Bookkeeping | Software used, frequency of updates, reconciliation responsibilities |
How should a limitation of liability clause be worded?
Use your professional body's recommended wording where one exists, typically capping liability at a multiple of fees or a fixed sum, and stating the cap applies to the firm and its staff jointly rather than allowing unlimited separate claims.
Courts assess these clauses for reasonableness under the Unfair Contract Terms Act 1977, so an unusually aggressive cap risks being struck out. Bodies such as ICAEW publish model clauses; adapting recognised wording is safer than drafting from scratch.
How can you speed up sending and signing letters?
Generate letters from a saved template with client details merged in automatically, send for e-signature, and track acceptance status against the client's onboarding checklist rather than chasing signatures manually by email.
Practice management software that stores your terms of business and schedules as templates lets you assemble the right combination per client in minutes and send for e-signature immediately, with the signed copy filed automatically against the client record.
What are common mistakes in accountancy engagement letters?
The most common mistakes are naming the wrong legal entity, letting the letter go years without review, omitting a liability cap, and performing services not covered by any schedule.
- Letter still names the client's old sole trader entity after incorporation.
- No schedule covers a service the firm is now actually performing (scope creep).
- Fees quoted in the letter no longer match current invoicing.
- No limitation of liability clause, or one copied from an unrelated industry template.
- Letter never re-signed after a material change in scope.
How Remindoo helps
This structure — terms of business plus service schedules — is exactly how Remindoo's engagement letter templates work. Build your standard terms once, then attach the relevant service schedules per client (accounts, tax, VAT, payroll and more), merge in client details automatically, and send for online e-signature rather than printing and scanning. Signed letters file straight against the client record, and because the templates sit inside the same platform as onboarding, a signed engagement letter can trigger the next onboarding step automatically rather than someone needing to remember to move the file forward. When a client's scope changes, you add or remove the relevant schedule and reissue, instead of redrafting the whole letter.
Frequently asked questions
Can I use one engagement letter for multiple services?
Yes — that's the point of a schedule-based structure: one set of terms of business with individual schedules attached for each service the client has engaged you for.
Do I need a lawyer to draft my terms of business?
Not necessarily if you adapt recognised professional body model wording, but it's worth having a solicitor review your liability clause and termination terms at least once.
Is it acceptable to email a PDF instead of using e-signature software?
It's acceptable but weaker evidentially — e-signature platforms provide a timestamped audit trail of who signed and when, which is more useful if a dispute arises later.
Should the engagement letter mention professional indemnity insurance?
Some bodies expect a statement that the firm holds professional indemnity insurance meeting the body's minimum requirements; check your body's specific disclosure rules.
What if a client refuses to sign the engagement letter?
Most bodies expect you not to start or continue work without a signed letter, since it's your primary evidence of agreed scope, fees and liability limits.
How do I handle a client engaged for one-off, non-recurring work?
Use a short-form schedule describing the one-off service and its own fee and deadline, attached to the same standard terms of business as recurring clients.
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Sources
Last updated 23 September 2026. General guidance, not legal or regulatory advice. Check with your professional body.
