HMRC supervises the AML duties of accountancy service providers that are not supervised by their professional body.
| Situation Triggering Run-Off | Minimum Cover Period | Who Arranges & Pays | ACCA Notification Required |
|---|---|---|---|
| Retirement of sole practitioner | 6 years | The retiring member/firm | Yes, within 30 days |
| Sale/transfer of practice | 6 years | The seller/outgoing firm | Yes, details of successor |
| Firm ceasing trading (no successor) | 6 years | The ceased firm | Yes, immediately |
| Death/incapacity of principal | 6 years | Firm's legal representatives | Yes, as soon as practicable |
The interaction matters for PI because the supervisory regime drives the conduct standards a court will use to set the duty of care.
Ten significant UK accountancy and tax bodies have a PI rule set.
Author: Apex Insurance Brokers — UK FCA-authorised commercial broker (FRN 724952), Bristol. This guide is written for a professional readership. Where regulators publish numerical minima or fee-income bands, the figures quoted reflect the rules in force as at the review date. PII regulations are amended periodically by each accountancy body, and firms must always read this guide alongside the current published rules of their regulator. Nothing here constitutes regulated advice — it is technical reference material to help principals brief their broker and challenge their renewal.
Why accountants are a distinct PI class ATT licensed members — the tax technician position Fee-multiple sizing: ICAEW, ACCA and the worked examples The R&D tax advice claim wave Sole-practitioner economics: why small does not mean cheap Professional Indemnity is, at heart, a contract liability product layered with a tort overlay. Most professional firms are exposed to similar archetypes of claim: negligent advice, missed deadlines, conflicts of interest. Accountants nonetheless occupy their own underwriting class because of three structural features that no other UK profession quite combines. Accountants alone are routinely appointed to perform functions whose liability and scope are defined directly by statute. The Companies Act 2006 prescribes the form of an audit report.
The Insolvency Act 1986 and Insolvency (England and Wales) Rules 2016 give insolvency office-holders specific duties, with personal liability attaching to the practitioner rather than the firm. The Taxes Management Act 1970 and the Finance Acts impose obligations on the agent that overlap with the client's own liability. Where a statute defines the duty, a court need not infer what a "reasonable accountant" would have done — the standard is set in the legislation, and the PI policy must respond to it. A solicitor's negligent advice is, in the typical case, actionable only by the client to whom it was given. An accountant's signature on a set of accounts is relied upon by HMRC, by the lender financing the client's overdraft, by the trade creditor extending payment terms, and — in the case of audited accounts — by the entire market. Each has its own minimum limits and run-off requirements.
A practice specialising in high-risk advisory work, for example, might need coverage exceeding what turnover-based formulas suggest. Type of work: Client profile significantly impacts risk levels. Practices serving large corporations, high-net-worth individuals, or regulated industries face different risk exposures than those focusing on small businesses or personal tax work. Complex corporate restructuring advice carries different liability risks than basic bookkeeping services. Contractual obligations: Some contracts stipulate minimum cover levels.
As a sole practitioner providing basic bookkeeping services to small local businesses, you might adequately manage risk with £250,000 coverage. However, if you were offering corporate tax advice to medium-sized companies, you would likely need £500,000 or more. If you’re asking yourself this question, ICPA can help. Accounting-specific insurers, like A-rated insurer AXA, understand the profession’s nuances and regulatory requirements. ICPA Pro, Premium, and Essentials members benefit from tailored cover provided by AXA, along with options to scale up affordably depending on your practice’s turnover and risk profile.
Don’t leave your practice exposed to preventable risks. Whether you’re a sole practitioner or a growing firm, contact ICPA today to discuss how our professional indemnity insurance solutions can provide the protection and peace of mind your practice deserves. Sign up to our mailing list to receive weekly bulletins on all of the latest accounting news. A definitive reference for principals, sole practitioners, audit firms, tax specialists, R&D advisers and insolvency practitioners operating within the United Kingdom. This guide consolidates every UK accountancy body's Professional Indemnity Insurance (PII) position, sets out how regulators tie required limits to gross fee income, and walks through the high-risk specialisms — audit, tax investigation overlap, R&D credit advisory, and insolvency — where PI placement most often goes wrong. A firm with multi-body membership must meet the highest applicable standard. Audit, AML and insolvency layer further requirements on top of the baseline PII rules. The Institute of Chartered Accountants in England and Wales sets out its Professional Indemnity Insurance Regulations as a stand-alone rule set, last consolidated by Council and amended periodically. Every ICAEW firm — defined as a firm with at least one principal who is an ICAEW member, or one that uses the description "Chartered Accountants" — must hold cover meeting these regulations.
| Rating Factor | High-Risk Example | Lower-Risk Example | Impact on Premium |
|---|---|---|---|
| Services Offered | Insolvency, M&A advice | Bookkeeping, payroll | High for complex services |
| Claims History | Multiple past claims | Clean record | Significant increase with claims |
| Client Types | High-net-worth, listed companies | Small local businesses | Higher for complex clients |
| Risk Management | Poor file reviews, no engagement letters | Strong systems, CPD, quality control | Discounts for good systems |
The ICAEW PII Regulations (Regulation 3.3 and supporting schedule) require firms to hold cover of: the greater of two-and-a-half times gross fee income in the immediately preceding accounting year, or subject to an overall cap of £3 million any one claim where 2.5 × gross fee income exceeds £3 million. Firms with gross fee income above £30 million negotiate higher limits but are no longer governed by the formulaic minimum and instead must demonstrate cover that is "adequate and appropriate" in writing to ICAEW.
Regulator says: ICAEW PII Regulations expressly require the minimum to be calculated on an any one claim basis, not in the aggregate, except for firms operating with aggregate cover (see 3.3 below).
The maximum permitted self-insured excess is the lower of: 3% of the firm's gross fee income.
The duty of care framework set out in Caparo Industries plc v Dickman [1990] 2 AC 605 restricts third-party recovery, but a quarter-century of case law since then has substantially carved out exceptions: assumed responsibility cases, Hedley Byrne economic loss claims, and the modern strand of audit-third-party claims following Barclays Bank plc v Grant Thornton UK LLP [2015] EWHC 320 (Comm). The third structural feature is the time over which a claim can crystallise. An audit signed in year one may not produce a writ until year seven, when a subsequent insolvency exposes the underlying error. A tax planning structure that has worked for a decade can collapse if HMRC's policy position shifts. Limitation begins to run when the cause of action accrues (six years for contract under the Limitation Act 1980, six years for negligence, twelve from latent damage discovery under s.14A) — and that creates a long-tail liability profile that PI underwriters price for explicitly.
Watch out: because of the long tail, run-off cover is not optional for retiring accountants. The Limitation Act gives a claimant up to 15 years from the act complained of to bring proceedings in certain latent damage scenarios. Six years of run-off is the regulatory minimum for most bodies — the prudent figure is longer. Accountants combine statutory roles, third-party reliance and long claim tails — three features that drive a distinct PI underwriting class. The Companies Act 2006, Insolvency Act 1986 bet free bets no deposit or wagering and a 30-year body of negligence case law set the duty framework.
Run-off cover is mandated by every accountancy body. Six years is the floor; longer is prudent. The Ultimate UK Professional Indemnity Insurance Guide (2026) How Much PI Cover Does My Accountancy Practice Need? Before drilling into individual rulebooks, it is worth orienting on which bodies regulate which work, and which PI rule applies when a firm is a member of more than one. A practitioner who holds membership of more than one body must comply with the highest standard. A firm with five principals therefore cannot run an excess above £150,000 per claim without seeking a dispensation. Where the firm wishes to retain a higher excess, ICAEW must be notified and a written justification (typically supported by capital adequacy) is required.
Where a firm elects to purchase cover on an aggregate rather than "any one claim" basis (more common in the £20m+ fee income segment), the aggregate limit must be at least equal to the any-one-claim minimum, and at least one reinstatement must be purchased. Reinstatement effectively buys a second tower of the same size to respond to a separate later claim.
A firm that has both ICAEW and ACCA principals must meet the ICAEW PII minimum if it is higher than ACCA's, and vice versa. Where an ICAEW-registered firm holds an audit registration, the audit regulations themselves bite on top of the PII regulations. Where a firm contains a licensed insolvency practitioner, that individual's licensing body sets a further minimum. The chartered bodies (ICAEW, ICAS, CAI) and ACCA are Recognised Supervisory Bodies (RSBs) for audit purposes under the Companies Act 2006, with the Financial Reporting Council (FRC) exercising direct oversight over Public Interest Entity (PIE) audits. The Insolvency Service oversees the RPBs that license insolvency practitioners. ICAEW PII obligations do not end with placement. Disclose to clients on request the existence and limit of PII (and to ICAEW on request); Notify ICAEW if cover is cancelled, declined, declared void, or subject to material restrictions; Maintain run-off for at least two years if the firm ceases (ICAEW recommends six years and a longer period is industry standard, particularly where audit work has been undertaken); Use a Participating Insurer — only insurers approved by ICAEW under the participation scheme may write the cover. ICAEW maintains a published list of Participating Insurers. The Participating Insurer agreement obliges the insurer to: offer renewal terms unless misrepresentation or non-payment is established; not impose retroactive date restrictions on continuing risks; give a minimum of 30 days' notice of any cancellation; Firms placing with non-participating insurers are in breach unless they have obtained specific dispensation.
