What if my old accountant won't cooperate or disputes fees?
Most switches are smooth, but the occasional friction almost always comes down to one of three things: a fee dispute, slow cooperation, or mid-job timing. The protections favour you. An accountant cannot refuse professional clearance purely because of a fee dispute, and a regulated firm is bound by its professional body to cooperate within a reasonable timeframe. They may, however, hold certain documents under a "lien" until outstanding fees are paid. If an old firm genuinely stalls, you can escalate to their professional body — (ICAEW, ACCA, or IFA) — but simply paying any legitimate outstanding bill resolves the vast majority of cases.
The three friction points — and how each is handled
| Friction point | How it's handled |
|---|---|
| Fee dispute | Clearance cannot be refused for fees alone, but a "lien" may retain documents. Fix: settle legitimate outstanding invoices before switching. |
| Slow / unresponsive cooperation | Regulated firms (ICAEW / ACCA / IFA) must cooperate within reasonable time. New accountant chases, then you escalate to their professional body. |
| Mid-year-end timing overlap | Pay overlap = avoidable by switching at a natural break (see Spoke 2), or accept small overlap as cost of moving on. |
Sources: ICAEW, ACCA and IFA code of ethics / professional conduct frameworks.
A difficult exit is often the clearest sign you were right to leave.
And the protections favour you. Regulated firms must cooperate within a reasonable timeframe. Clearance cannot be withheld over fees alone. There is a complaints route if needed. The practical move is simple — settle any legitimate bill, let your new accountant drive the process, and escalate only if you are genuinely stonewalled.
Friction point 1: Fee disputes (the most common)
By a wide margin, the most common cause of switch-friction is a disagreement about money. The mechanics under UK professional rules are clear:
- Clearance cannot be refused purely over a fee dispute. The old firm can mention the dispute to your new accountant (and indeed has an ethical obligation to disclose any matter your new advisor would need to know), but they cannot make clearance contingent on payment.
- A "lien" can apply to documents they themselves prepared. A lien is a legal right to retain certain documents (final accounts, tax computations, working papers) until the bill that produced them is settled. It does not extend to your original records — invoices, bank statements, receipts you provided — which must be returned.
- The fix is almost always boring. Settle any legitimate outstanding invoice, get the lien released, and move. If a fee is genuinely unreasonable, that is a separate dispute — but do not let it hold the entire switch hostage. Pay what is properly owed and move on.
The cleanest reading: a lien protects the accountant's right to be paid for work they have done; the clearance obligation protects your right to change advisor. The two operate in parallel. Pay the legitimate part, contest the unreasonable part separately, and your switch goes through.
Friction point 2: Slow or unresponsive cooperation
If your old accountant belongs to a UK professional body — ICAEW, ACCA, or IFA — they are required to cooperate with your new accountant within a reasonable timeframe. The code of ethics is explicit on this:
- The new accountant chases first. A polite follow-up after seven to ten working days usually gets a response. Two emails and a phone call is the normal cadence before anything formal happens.
- You can proceed without full cooperation if essential information is in hand.The professional clearance letter is a courtesy framework, not a precondition. As long as your new accountant has the essential information (last year's accounts, tax returns, HMRC correspondence) and you have re-authorised them with HMRC, the switch can complete.
- If they continue to stonewall, you escalate. See the escalation path below — a complaint to the relevant professional body is a powerful (and rarely necessary) lever. The mere mention of it typically resolves the issue.
In practice: lateness is normal, stonewalling is rare, and the threat of professional-body escalation is almost always enough. The cooperation duty is real, and regulated firms do not want a complaint on their file.
Friction point 3: Mid-year-end timing and overlap
Switching mid-year-end can mean paying both firms for overlapping periods of work. This is not a fight — it's arithmetic. Two routes:
- Switch at a natural break. Right after your year-end accounts are filed (so the old firm closes their work cleanly) is the cleanest moment. Right after Self Assessment season (early February) is the second cleanest. See the mid-year switching guide for the full timing decision tree.
- Accept a small overlap as the cost of moving on sooner. If the value of switching now outweighs a few hundred pounds of overlap, just do it. A proactive accountant typically pays for themselves in the first year through better tax planning alone — the overlap is rounding error against that.
The trap to avoid: staying with a poor accountant for another six months "to avoid the overlap". Six months of missed planning, slow replies, and reactive compliance almost always costs more than the overlap would have.
The escalation path — how to complain
The vast majority of switches never need this section. But if you are genuinely being stonewalled — clearance ignored, records withheld beyond what a lien justifies, weeks of silence — here is the route:
- Identify the regulator.Most UK accountants are supervised by one of the three main bodies. Check the firm's website footer, letterhead, or engagement letter — it will say.
- File a complaint through the body's published process.
- ICAEW — professional conduct procedure (icaew.com).
- ACCA — disciplinary process (accaglobal.com).
- IFA — conduct procedure (ifa.org.uk).
- Be specific.Dates, what was promised, what happened, evidence (emails, the original engagement letter, your new accountant's clearance letter). Focus on professional standards — failure to respond, refusal to release records you own, refusal to cooperate.
- Tell the firm you are doing it. A short, polite note that the next step will be a formal complaint to their professional body resolves the matter in most cases. No regulated firm wants a complaint on file.
Anti-money-laundering supervision is separate: most accountancy firms are supervised either by their professional body or directly by HMRC (GOV.UK — money laundering regulations). The complaint route remains the professional body in either case.
Related reading in the Switch Accountants series
- How to change accountant: the 2026 guide — the pillar; the full switching process end-to-end.
- The professional clearance letter explained — what it is, why it exists, and what your old firm is obliged to do with it.
- Records and software handover — what records belong to you, and how cloud bookkeeping software moves over.
Where to complain (UK professional bodies)
- ICAEW — Institute of Chartered Accountants in England and Wales. Professional conduct procedure at icaew.com.
- ACCA — Association of Chartered Certified Accountants. Disciplinary process at accaglobal.com.
- IFA — Institute of Financial Accountants. Conduct procedure at ifa.org.uk.
Tip: tell the firm in writing that the next step is a formal complaint to their professional body. That single line resolves most disputes before any complaint actually has to be filed.
Frequently asked questions
Can my old accountant refuse to release my records?
Not the records that belong to you. Anything you provided to them — invoices, bank statements, receipts, your own books — must be returned. A regulated firm can, however, retain documents they themselves prepared (final accounts, tax computations) under a 'lien' until any genuinely outstanding fee is paid. They cannot withhold professional clearance from your new accountant solely because of a fee dispute, and they cannot refuse to release information needed to comply with HMRC.
What is a lien and when does it apply?
A lien is a legal right to retain documents that a professional has created until they have been paid for the work that produced them. For accountants, this typically covers items like final statutory accounts or tax computations they prepared but have not yet been paid for. A lien does not extend to your original records — those remain yours and must be returned. And it does not give an accountant the right to refuse professional clearance over a fee dispute; clearance is a separate professional obligation.
What do I do if my old accountant ignores my new accountant's clearance letter?
First, let your new accountant chase — a polite second request usually gets a response. If it does not, your new accountant can proceed with what they have, as long as they have the essential information from you and from HMRC. The professional clearance letter is a courtesy framework, not a precondition. If the old firm continues to stonewall and is regulated (ICAEW, ACCA or IFA), you can escalate a complaint to their professional body — see the escalation path below.
Can I be charged for the disengagement letter?
Most regulated firms do not charge separately for the disengagement letter itself — it is a normal part of closing a client engagement. Some firms quote a small administrative fee for collating handover information, copying files, or producing computations they have not yet billed for. Anything beyond that should be specified in your original engagement letter; if it was not disclosed there, you can reasonably push back. A genuine outstanding fee for work already done is different — that is a normal bill and should be settled.
How do I escalate a complaint about my old accountant?
Find out which body they are regulated by — it is usually on their website footer or letterhead. Then file a complaint through that body's published process: ICAEW (icaew.com), ACCA (accaglobal.com) or IFA (ifa.org.uk). The complaint should be specific (dates, what was promised, what happened, evidence) and focused on professional standards — clearance refused, records withheld, failure to cooperate, missed deadlines. Each body has a formal disciplinary process and the firm is required to respond. In practice, the threat of a complaint usually resolves the dispute well before a formal investigation is needed.
What if the fee dispute is genuinely unfair?
Separate the two issues in your head. The fee dispute is one matter — it is between you and the old firm, and it can be challenged through their internal complaints process and, if needed, the professional body. The switch is a different matter — you can move regardless. The practical move is to settle anything clearly owed under your engagement letter, get yourself out, and then pursue the disputed portion separately. Holding the entire switch hostage to a fee fight rarely ends well; once you are gone, the dispute is much easier to negotiate.
Can I switch even if I'm in the middle of an HMRC enquiry?
Yes. An open HMRC enquiry does not lock you to your current accountant — agents can be changed at any time. In practice you would want a clean handover: the new accountant takes over the correspondence, gets up to speed on what HMRC has already asked and what has been answered, and continues from there. The old firm's professional obligation to cooperate covers handing over the enquiry file alongside everything else. Just be honest with your new accountant up front so they can scope the work and timing accurately.
The full Switching Accountants series
Pillar
How to change accountant: the 2026 guide
The pillar — clearance, records, HMRC authorisation, timing, and the protections you have.
How to change accountant — the step-by-step
The exact sequence: choose the new firm, sign the engagement, clearance letter, records, HMRC re-authorisation.
Can I switch accountants mid-year?
Yes — and the cleanest handover points to avoid paying twice for overlapping work.
The professional clearance letter explained
What it is, why it exists, and how regulated firms handle it under ICAEW / ACCA / IFA rules.
Records and software handover
What records belong to you, what gets transferred, and how cloud bookkeeping software moves over.
Six signs it's time to change accountant
Poor communication, missed deadlines, rising fees, reactive-not-proactive — the patterns that mean it's time.
Switching accountants is simpler than people think.
Your new accountant handles the heavy lifting. Two emails, an ID check, and a few weeks later you're set up — with the dividend, MTD and payments-on-account planning your old firm probably wasn't doing.
We do almost all the work
Professional clearance letter to your old firm, records collected, HMRC agent authorisation done online. Your part: two emails and a quick ID check.
Switch any time of year
You do not have to wait for year-end. We pick the cleanest handover point so you do not pay twice for overlapping work.
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A regulated practice. Your old accountant is professionally bound to cooperate within a reasonable timeframe, and your records and HMRC position stay protected throughout.
IFA-supervised UK chartered practice · four UK offices · switch handled from clearance to HMRC authorisation
About the author
Mehmood Rajoka, Managing Partner, RR Accountants
Managing Partner at RR Accountants — a UK practice supervised by the Institute of Financial Accountants. Mehmood has handled hundreds of incoming-client switches and writes RR's guides on changing accountants, professional clearance, and the regulated-firm protections UK business owners actually have.
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This guide is general information about the UK professional rules that apply when changing accountant. It is not personal legal or tax advice. For advice tailored to your situation, speak to a regulated UK accountant or your prospective new firm. Professional body procedures verified against ICAEW, ACCA and IFA published guidance as of .