Tax Advice & Compliance
Claims involving tax planning, reliefs, R&D claims, cross-border arrangements, trusts, filing obligations, deadlines and alleged additional tax, penalties or lost relief.
← Professional Negligence Claims Defence
Accountants & Tax Advisers
Professional Negligence Claim Against Your Accountancy or Tax Practice?
Claims against accountants are rarely just about whether a number was wrong. The real questions may concern the scope of the engagement, the information supplied, the advice actually given, causation and whether the alleged financial loss follows from the professional’s work.
Insurance Dispute Service provides fixed-fee claims analysis, defence preparation and litigation support for accountants, tax advisers and accountancy practices, with specialist Direct Access barrister involvement where appropriate.
30+ Years’ Litigation Experience
Defined Work & Fixed Fees
Professional Indemnity Issues
Direct Access Barrister Support
Where Claims Arise
The allegation may concern far more than the annual accounts.
Accountancy practices increasingly provide a wide range of professional services. The type of service matters because the alleged duty, evidence and financial consequences can be very different from one claim to another.
Financial Reporting
Allegations concerning accounts, financial statements, accounting treatment, reporting errors or information said to have been relied upon in commercial decisions.
Audit & Irregularities
Claims may allege that warning signs, misstatements, irregularities or fraud should have been identified through the work undertaken.
Business Structures & Transactions
Professional advice relating to acquisitions, disposals, corporate structures, reorganisations, due diligence, valuations or other transactions.
Valuations & Financial Information
Disputes concerning company valuations, financial projections, historic figures or assumptions relied upon by clients, purchasers, lenders or other parties.
Confidentiality & Data
Claims involving confidential financial information, disclosure, data handling, cyber incidents or alleged failures to protect client information.
Start With the Engagement
What was the accountant actually retained to do?
A negligence allegation can sometimes assume that the accountant was responsible for every financial or tax consequence affecting the client. The engagement documents may tell a very different story.
The defence should identify the services actually agreed, any limitations on the retainer, the information the accountant was entitled to rely upon and which decisions remained the responsibility of the client or another adviser.
- Letter of engagement and terms of business
- The precise service or tax advice requested
- Information and assumptions supplied by the client
- Any limitations or exclusions within the agreed scope
- Warnings and qualifications given by the accountant
- Work undertaken by other advisers
- Decisions ultimately made by the client
Tax Advice Claims
A tax charge is not automatically the same thing as a recoverable negligence loss.
Tax-related professional negligence claims can involve difficult questions about what advice was requested, the law and guidance at the relevant time, information supplied by the client and what the client would actually have done if different advice had been given.
The defence should distinguish between the tax consequence
itself and the additional financial loss said to have resulted
from negligent advice.
01
What advice was actually sought?
Was the accountant asked to provide comprehensive tax planning, answer a specific question, prepare a return or act on a particular set of instructions?
02
What information was available?
Tax advice may depend heavily on facts supplied by the client. Incomplete, inaccurate or late information can materially change what could reasonably have been advised.
03
What would have happened otherwise?
If the claimant says a different structure or transaction would have been adopted, that alternative needs to be examined rather than assumed. Would it genuinely have happened, and on what terms?
04
What is the real financial difference?
The calculation may need to separate ordinary tax that would have been payable in any event from additional tax, penalties, interest, lost relief or other loss allegedly caused by the professional advice.
05
Were warnings or uncertainty communicated?
Contemporaneous advice, caveats, assumptions and warnings may be important where the claimant later presents the advice as more definite or comprehensive than it actually was.
Follow the Money
The size of the claimed loss needs to be tested, not simply repeated.
Professional negligence claims against accountants can involve substantial figures, but the amount claimed still needs a clear causal and evidential basis.
The central question may be: what financial position would the claimant probably have been in if the accountant had acted as the claimant says they should? That counterfactual position can be very different from simply adding together every later financial consequence.
Would the client actually have taken the alternative course?
Would tax or another cost have arisen anyway?
Did later commercial decisions contribute to the loss?
Has the claimant taken reasonable steps to mitigate?
Protect the Insurance Position
A claim against the practice may also create a dispute with the PI insurer.
The relevant professional indemnity policy should be identified and any notification requirements considered promptly. For ICAEW practising-certificate holders engaged in public practice, qualifying professional indemnity insurance is a regulatory requirement.
Even after a claim is notified, issues can arise about the correct policy year, exclusions, aggregation, excesses, reservation of rights or whether the insurer accepts indemnity.
Pre-Action Stage
A formal claim should be dealt with in a structured way.
Where the Professional Negligence Pre-Action Protocol applies, the objective is to identify the issues, exchange relevant information and explore resolution before proceedings are issued.
Received a Letter of Claim? →
01
Identify exactly what is alleged
Separate the individual allegations, the contractual or professional duties relied upon, the causation case and each head of claimed loss.
02
Preserve and organise the file
Engagement documents, emails, tax computations, working papers, meeting notes, accounts, advice, HMRC correspondence and other contemporaneous records may become central evidence.
03
Investigate before giving the substantive answer
Where the Protocol applies, a Letter of Claim should normally be acknowledged within 21 days and the professional then normally has three months from acknowledgment to investigate and respond, subject to any agreed extension.
04
Respond to the actual case
The substantive response should address what is admitted, denied or disputed and, where appropriate, explain the professional’s own version of events and position on the claimed financial loss.
How We Can Help
Turn the professional file into a structured defence.
Our role is not simply to draft a denial. It is to understand the allegation, organise the evidence and identify what actually needs to be proved, challenged or clarified.
01 / ANALYSIS
Break down the claim
Identify the engagement, allegations, professional issues, causation case and claimed financial consequences.
02 / EVIDENCE
Build the chronology
Organise the contemporary records, advice, tax documents, working papers and communications around the issues that matter.
03 / INSURANCE
Examine PI cover
Review the insurer’s position where notification, reservation of rights or indemnity has become part of the problem.
04 / STRATEGY
Prepare the next stage
Prepare the matter for appropriate expert input, specialist legal advice, negotiation or litigation support where required.
Industry Context
Professional indemnity exposure for accountants continues to evolve.
ICAEW-hosted industry commentary published in January 2026 identified financial reporting, tax advice and compliance, confidentiality and data security, failure to detect fraud or irregularities, and advice on business structures and transactions among prominent PI claim areas.
Read the ICAEW-hosted claims commentary ↗Common Questions
Claims against accountants and tax advisers
Does an incorrect tax outcome automatically mean the accountant was negligent?
No. The relevant question depends on what the accountant was retained to do, the information available at the time, the professional standard applicable to the work and whether any alleged error caused recoverable loss.
Can the engagement letter help defend the claim?
Potentially. The engagement documents can be central to establishing the services agreed, the limits of the retainer, client responsibilities and whether the claimant is alleging a duty that the accountant never actually assumed.
What documents should be preserved?
Potentially relevant material can include engagement documents, emails, attendance notes, working papers, tax computations, accounts, reports, advice, client instructions and correspondence with HMRC or other advisers.
Should the professional indemnity insurer be notified?
The applicable policy wording should be checked promptly. Professional indemnity policies commonly contain requirements concerning notification of claims and circumstances.
What if the insurer appoints solicitors?
That may provide the principal legal defence to the claim. There can still be circumstances where the practice wants independent support concerning its own evidence, commercial interests or a separate insurance coverage issue.
Can IDS replace a solicitor?
IDS provides claims analysis, case preparation and litigation support. The appropriate professional structure depends on the work required. Reserved legal activities must be undertaken by a person with the appropriate authorisation.
Important information
Insurance Dispute Service provides claims analysis, case preparation and litigation support. The appropriate route depends on the claim, insurance position, evidence, procedure and work required.
Public Access enables suitably registered barristers to accept direct instructions. Conduct of litigation is a separate reserved activity and appropriate authorisation is required where a professional undertakes that work on a client’s behalf.
This page provides general information and is not legal advice. No particular outcome is guaranteed. Limitation periods, procedural deadlines, insurance notification requirements and the applicable pre-action process should be checked for the individual claim.
Claim Against Your Practice?
Understand the professional file before deciding how to defend the claim.
If a negligence claim has been made against your accountancy practice or tax advisory business, speak to us about the allegations, evidence and professional indemnity position.