Accountant Disengagement Letter Template (UK)

The whole point is a cut-off date for each service, not one for the relationship

Ending an engagement is not a single event. A firm might have finished the accounts for the year ended 31 March, filed the corporation tax return for the year before that, run payroll up to last month, and be halfway through a VAT quarter. A letter that says "we will cease to act with effect from today" leaves every one of those threads ambiguous.

ICAEW's guidance on disengagement letters puts this at the centre: the purpose is to clarify which matters the firm still has responsibility for during any handover and which fall to the new accountant, so there is no misunderstanding about what has been completed and what remains outstanding. It flags ongoing, business-critical work — payroll processing and VAT returns are the named examples — as where this matters most, and recommends establishing and communicating a clear cut-off point.

So this template asks you to switch on each service that was in scope and give it its own two facts: the last period you completed, and the date it was filed or delivered. Every service you switch on prints its own cut-off, followed by an explicit statement that the firm has no further responsibility for later periods. A generic "our engagement ends today" is replaced by something a successor can actually work from.

The successor's professional enquiry: section 320, not section 210

When a client moves, the incoming accountant is expected to contact the outgoing one to establish the facts and circumstances behind the change, so they can make an informed decision about accepting the appointment. This is the professional enquiry, and in the ICAEW Code of Ethics it sits in Section 320, on changes in professional appointment. It is worth being precise about, because letters in circulation cite Section 210 — which is professional competence and due care, a different provision entirely.

Two details of Section 320 belong in the letter and are usually missing. First, the enquiry cannot be answered without the client's consent, which is precisely why a disengagement letter carries a client response consenting to the firm communicating with the successor and releasing information. Second, there are limits on what may be asked: the incoming accountant must not ask whether the outgoing firm has reported a suspicion of money laundering, and cannot rely on the predecessor's client due diligence — anti-money-laundering identification is the new firm's own responsibility and is not delegable.

There is also a practical point worth putting in writing. If the outgoing firm simply does not reply, the incoming accountant's route is to write again by recorded delivery stating an intention to accept the appointment in the absence of a response within a stated reasonable period, and silence may then be treated as no adverse comment. Saying in the letter that you will respond promptly is a small professional courtesy that spares everyone that dance.

"With immediate effect" and "we will finish the outstanding work" cannot both be true

A common drafting failure is a letter that opens by ceasing to act with immediate effect and then, further down, promises to continue providing the remaining services described in the letter. Those are different engagements with different risk profiles, and a letter that says both leaves the firm exposed on work it has told the client it is no longer doing.

This template makes you choose. Immediate cessation means responsibility stops on the stated date and nothing is carried on. Cessation on completion of named residual work means you list precisely what you will finish, and the letter says that your responsibility ends when that specific work is delivered — with everything else stopping at once. The residual-work list only appears if you pick the second option, so the contradiction cannot be drafted by accident.

Records: your destruction deadline against the client's retention duty

Disengagement letters routinely give the client a short window — six months is typical — to collect their records, after which the firm may destroy anything it still holds without further notice. Set against the client's own statutory retention duty, that is an uncomfortable combination: companies and LLPs generally need their records for six years from the end of the accounting period, and individuals and partnerships with trading or rental income for five years and ten months after the end of the tax year. A six-month destruction clause can destroy documents the client is legally obliged to keep, in a letter that never mentions the obligation.

This template does three things differently. The collection period is a field you set rather than a hidden default. The letter states the client's own retention periods next to it, so the deadline lands in context. And destruction is on notice — the firm undertakes to write before disposing of anything — rather than something that quietly happens.

Alongside that, the letter separates two things people conflate: the client's own books and records, which are theirs and should be returned, and the firm's working papers, which remain the firm's property. Being explicit about the distinction is what stops a handover turning into an argument about entitlement.

If you are the client ending the engagement, the letter has a different job

Search demand for this document is split. Firms look for a disengagement letter; businesses look for a letter to end their accountant's engagement, get their paperwork back and move on. It is the same document seen from either end, which is why this template covers both directions rather than making you adapt a firm-side letter.

In the client-side version, the letter gives notice under the existing engagement, sets the date the engagement ends, asks for the return of the client's own books and records and for a final invoice, and asks the firm to respond to the incoming accountant's professional enquiry — with the client's consent given in the letter itself, since without it the outgoing firm cannot answer.

It also does the thing most client-side letters forget: withdrawing the firm's authority to act as agent with HMRC. An accountant's HMRC authorisation does not lapse because you sent a letter — it has to be removed, and the letter both asks the firm to stop acting and records that you are removing the authorisation from your own side. Leaving an old agent authorised is how correspondence goes to a firm that no longer works for you.

The sections, explained

Direction of the letter

Choose whether the firm is resigning or the client is ending the engagement. Every section that differs between the two — purpose, requests, consents, signature roles — swaps automatically rather than needing manual editing.

Purpose and effective date

States plainly that the relationship is ending and from when, with a reference to the engagement letter being brought to an end so there is no doubt which agreement is being closed.

Basis of cessation

Immediate, or on completion of named residual work. Picking the second reveals a list where you set out exactly what will still be finished — the only way to promise continuing work without contradicting the cessation statement.

Services and per-service cut-off

One switch per service that was in scope — accounts, corporation tax, Self Assessment, VAT, payroll, pension auto-enrolment, bookkeeping, company secretarial. Each prints the last period completed and the date filed, then states that no responsibility is accepted for later periods.

Respective responsibilities

Who does what now: appointing a successor is the client's job, responding to the successor's professional enquiry is the firm's, and anti-money-laundering due diligence is the incoming firm's own and cannot be inherited.

Consent to communicate with the incoming accountant

The professional enquiry under the Code of Ethics cannot be answered without the client's consent, so the letter carries that consent — including consent to release documents, with a request to flag any additional cost first.

HMRC and Companies House authorisations

Removes the firm's agent authorisation rather than assuming it lapses, and covers any Companies House authentication or presenter arrangements — the administrative loose ends that keep correspondence flowing to the wrong firm.

Records and working papers

Returns the client's own books and records, keeps the firm's working papers as the firm's property, sets a collection period, states the client's statutory retention duty alongside it, and makes destruction subject to notice.

Outstanding fees (optional)

States what is unpaid and when it falls due, and notes any lien the firm is entitled to exercise over papers in its possession until fees are paid, so far as professional rules permit.

Confidentiality, third-party rights and liability

Confirms confidentiality continues after the engagement ends, excludes third-party enforcement under the Contracts (Rights of Third Parties) Act 1999, and confirms that the limits agreed in the original engagement terms carry over rather than being silently rewritten by this letter.

Client response

A signature block for the acknowledgement, so the consent and the cut-off dates are agreed rather than merely asserted. The sender signs; the recipient acknowledges.

What to get right in a UK disengagement

These are the professional and legal points that shape the letter. Confirm your own professional body's current guidance before you send one.

• Set a clear cut-off point, service by service

  ICAEW's disengagement-letter guidance treats the letter's purpose as clarifying which matters the firm still has responsibility for during handover and which pass to the new accountant, so nothing is left ambiguous. It singles out ongoing, business-critical work such as payroll processing and VAT returns, and recommends establishing and communicating a clear cut-off — a written letter being best practice.

  ICAEW — disengagement letters helpsheet

• Respond to the successor's professional enquiry — under Section 320

  Changes in professional appointment are dealt with in Section 320 of the ICAEW Code of Ethics. The incoming accountant contacts the outgoing firm to establish the facts and circumstances behind the change; the outgoing firm needs the client's consent to reply, which is why the letter carries it. Letters citing Section 210 for this duty are citing professional competence and due care instead.

  ICAEW — change of professional appointment (outgoing accountant)

• Do not expect the predecessor to have done the incoming firm's due diligence

  Under the Code of Ethics the proposed accountant does not ask whether the existing accountant has reported a suspicion of money laundering, and does not ask whether client identification has been carried out — client due diligence under the Money Laundering Regulations 2017 is the new firm's own responsibility and cannot be delegated to the outgoing firm.

  ICAEW — change of professional appointment (incoming accountant)

• Do not set a records-destruction deadline that cuts across the client's retention duty

  Companies and limited liability partnerships generally need to keep records for six years from the end of the accounting period, and individuals and partnerships with trading or rental income for five years and ten months after the end of the tax year. A short collection window followed by destruction without notice can dispose of records the client is required to keep, so state the retention duty in the letter and make destruction subject to notice.

  GOV.UK — company and accounting records

• Deal with agent authorisations rather than assuming they lapse

  An accountant's authority to act as agent with HMRC continues until it is removed. Since 18 May 2026 a further consideration applies at the other end of the handover: under Part 7 of the Finance Act 2026 the incoming firm must itself be registered with HMRC as a tax adviser and hold an Agent Services Account before it interacts with HMRC about the client's affairs.

  Finance Act 2026, Part 7

• Keep confidentiality and the original liability position intact

  Confidentiality obligations survive the end of the engagement, subject to the disclosures the law or professional rules require. A disengagement letter should confirm that the liability position agreed in the original engagement terms continues to apply to the work already done, rather than attempting to introduce a new and untested limitation at the point of exit.

How to write the letter

1. Choose the direction. Firm ending the engagement, or client ending the engagement. This decides the purpose paragraphs, the requests and the consents.
2. Fill in the parties and the engagement being ended. Sender and recipient names and addresses, your reference, the date of this letter, and the date of the engagement letter that is being brought to an end.
3. Set the basis of cessation. Immediate, or on completion of named residual work. If you choose the second, list exactly what you will still finish.
4. Switch on each service that was in scope. For every service, give the last period you completed and the date it was filed or delivered. Anything you leave off simply does not appear.
5. Deal with records, authorisations and fees. Set the collection period for records, decide whether to withdraw HMRC agent authority in this letter, and switch on the outstanding-fees section if anything is unpaid.
6. Send it and get the response signed. Download as Word or PDF, send it with a copy for signature, and keep the signed client response — it is what evidences the consent to speak to the incoming accountant.

Frequently asked questions

Related templates

• Accountant Engagement Letter Template (UK)
• Accountants' Standard Terms of Business Template (UK)
• Acknowledgement Letter Template (UK)