CIOT publishes its Professional Rules and Practice Guidelines (PRPG) and a specific PII Regulations section. CIOT requires its members in practice to hold PII at not less than: a minimum floor of £100,000 for the smallest sole-practitioner practices, and a tapering structure that brings firms above £400,000 of fees to a £1,000,000 minimum. Many tax-only firms hold both Chartered Tax Adviser (CIOT) members and Taxation Technician (ATT) members.

Do You Have a Legal Requirement to Have Professional Indemnity Insurance?

The Public Practice Regulations set out the PII obligations. ICAS aligns broadly with ICAEW: the greater of 2.5 × gross fee income or £1.5 million, with the £3m cap on the formula for sub-£12m firms. Beyond that, "adequate and appropriate" cover is required. The ICAS excess cap mirrors ICAEW: lower of £30,000 per principal or 3% of gross fee income. Two Scots-law features should be on the underwriter's risk note: Scots law has a five-year prescriptive period for most obligations under the Prescription and Limitation (Scotland) Act 1973, but with delayed-discoverability provisions that can extend the practical exposure considerably.

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The 2018 amendments brought parts of the regime closer to England's Limitation Act framework, but differences remain. Scottish law applies joint and several liability among delinquent professionals somewhat differently from English law; counsel's advice is essential where a claim has both English and Scottish defendants. ICAS is a Recognised Supervisory Body for audit purposes. ICAS audit firms must hold PII that responds to audit work and must notify ICAS Audit Monitoring of any audit-related claim. The minimums apply uniformly to audit and non-audit firms; the standard expected on placement, however, is markedly higher for audit firms with quoted-company or substantial pension-scheme audits in their portfolio. The CIOT/ATT joint guidance treats the firm-level requirement as set by the highest bet betting site offers uk body; in practice, where any principal is a CIOT member, the CIOT rules apply firm-wide. CIOT-regulated tax firms see a recurring pattern of claim types that drive limit-setting: Mis-application of a tax statute (capital allowances, EIS/SEIS, IHT business property relief). Failure to file or to advise of a filing deadline. Negligent advice on a tax-driven structure (EBT, contractor loan schemes, certain R&D positions). Misadvice on residence and domicile (heightened risk since the 2024 statutory residence reforms). These claims often combine direct tax loss (the unpaid tax, interest, sometimes penalties) with consequential loss (forced sale of an asset, breakdown of a transaction). Heads of damage compound, and a £1m minimum can be eroded quickly by a single high-net-worth client matter. CIOT requires six years of run-off at the level of the last live limit. Worked example: A CIOT-regulated tax boutique with £900,000 of fees must hold at least 2.5 × £900k = £2.25m. The firm runs a single high-net-worth client with annual planning fees of £80,000 and a potential structure size of £4m. The minimum complies with CIOT, but is not "adequate" for the actual risk: the broker should recommend at least £5m to give headroom. CIOT requires 2.5 × fees with a £100k floor and a £1m practical minimum for mid-sized firms.

The regulatory backdrop — what ICAEW, ACCA and AAT require

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. This matters at renewal: a "cheaper" non-participating quote may not be a permitted alternative. Worked example: A four-partner ICAEW firm in Bristol with gross fee income of £1.6 million must hold not less than 2.5 × £1.6m = £4m any one claim, but is capped at the £3m floor where 2.5 × fees > £3m — so the minimum is £3m. Excess cannot exceed the lower of 4 × £30k = £120k, or 3% × £1.6m = £48k.

Cover starting at £5 a month

The binding excess cap is therefore £48k. The ICAEW PII Regulations apply at firm level. Where the practice operates through a holding entity with subsidiary undertakings (common in the consolidator model of recent years), the regulations require that the consolidated gross fee income be used to calculate the limit, and that all entities undertaking regulated work be named insureds. Networks where firms share branding but not legal structure must each carry their own compliant cover. ICAEW minimum: greater of 2.5 × gross fee income or £1.5m, capped at £3m for sub-£12m firms; "adequate" cover beyond.

Employers’ liability insurance

Excess cap: the lower of £30k per principal or 3% of gross fees. Must place with a Participating Insurer; run-off mandatory. How Much PI Cover Does My Accountancy Practice Need? The Association of Chartered Certified Accountants regulates UK-based members in practice through the Global Practising Regulations (GPR), with PI requirements set out in Annex 1 and referenced by ACCA's Bye-Law 8 conduct framework. The minima are constructed in a sliding scale rather than a single floor. Tax claims combine direct and consequential loss — minima erode quickly on HNW work.

Annual Gross Fee Income Band	Minimum PII Cover (Any One Claim)	Minimum Aggregate Cover
Up to £100,000	£100,000	£200,000
£100,001 - £200,000	£250,000	£500,000
£200,001 - £500,000	£500,000	£1,000,000
£500,001 and above	£1,000,000	£2,000,000

The Association of Taxation Technicians sits alongside CIOT as the sister-body for tax practitioners.

Maintain a valid MOT certificate if the vehicle is over the required age, as insurance may be void without it.
Keep the vehicle in a roadworthy condition; insurers may refuse claims for defects that caused an accident.
Do not use the vehicle for any purpose excluded by the policy, such as racing or track days.
Secure the vehicle against theft by using appropriate locks and alarms as specified by the insurer.

Its Members in Practice (MiP) rules require licensed members to hold PII at the same proportional structure as CIOT. a £1,000,000 minimum for firms above £400,000 of fees. A meaningful proportion of ATT MiPs operate as compliance and bookkeeping practitioners with a tax-return-heavy book of business. The risk profile is different from a CIOT-only advisory boutique: high volume of low-value engagements, lower per-claim severity but higher claim frequency. PI structuring should reflect this — a relatively lower per-claim limit with a higher aggregate or reinstatement may be more appropriate than a flat any-one-claim policy. ATT requires six years of run-off and reserves the right to suspend the MiP licence if PII evidence is not produced on demand.

Ensure the policy meets the minimum requirements for any associated finance or leasing agreement.
If using the vehicle for ride-sharing or delivery services, obtain specific business use coverage.
For modified vehicles, seek a specialist policy or endorsement that covers the modifications.
Verify coverage for driving in other countries if planning a trip abroad (may require a Green Card).

ATT mirrors CIOT structurally: 2.5 × fees, £100k floor, £1m practical minimum at £400k+ fees.

Member Type / Firm Size	Minimum Limit of Indemnity (per claim)	Minimum Excess (per claim)	Policy Basis
Practising Certificate Holder (Sole Practitioner)	£100,000	£2,500	Civil Liability
Firm (1-3 Partners)	£250,000	£5,000	Civil Liability
Firm (4-10 Partners)	£500,000	£10,000	Civil Liability
Firm (11+ Partners)	£1,000,000	£25,000	Civil Liability

Tax technician portfolios skew to frequency rather than severity — structure accordingly. The Association of Accounting Technicians licenses members in practice through its Licensed Accountant and Licensed Bookkeeper schemes.

Declare all material facts relevant to the risk, such as the vehicle's primary use (e.g., business, commuting).
Accurately state the vehicle's registered address and where it is normally kept overnight.
Disclose any previous insurance claims, cancellations, or refusals within the period requested by the insurer.
Provide correct information about the driver's license status, points, and convictions for all drivers.
Declare any pre-existing damage to the vehicle before the policy inception.

AAT is the largest UK accountancy body by membership and supervises a substantial number of small-practice principals.

Do accountants need insurance?

ACCA's PII requirement scales the minimum limit to gross fee income as follows: A firm sitting just above each band must move up to the next minimum — and underwriters typically price at, or above, that minimum. For firms in the upper bands ACCA permits aggregate cover where: the aggregate limit is at least double the any-one-claim requirement, or ACCA caps the self-insured excess at 2% of gross fee income per claim, subject to insurer agreement. Where the excess exceeds this, the principals must be able to demonstrate capital sufficient to honour it. ACCA Bye-Law 8 — the foundation of the Disciplinary Regulations — empowers ACCA to discipline members for failing to comply with the GPR, including PII. A practitioner who allows cover to lapse, places with a non-compliant insurer, or fails to notify ACCA of a material claim, is exposed to a disciplinary process.

Errors and Omissions

Continuing professional development records and PII evidence are typically requested together at the annual practising certificate renewal. Run-off is required for at least six years following cessation of practice, with the limit equal to the last live limit. ACCA recommends — though does not mandate — that audit firms maintain run-off for longer where the firm has signed Companies Act audits within the limitation window. Worked example: A sole-practitioner ACCA member with gross fee income of £180,000 must hold 2.5 × £180k = £450,000 — above the £100k floor and below the £500k band minimum. The next band starts at £200,001 of fees, when the limit jumps to £500,000 minimum.

Breach of Confidentiality

ACCA requires its members in practice to: Confirm PII compliance annually at practising certificate renewal; Disclose insurer details to ACCA on request; Notify ACCA of any decline, cancellation, void or non-renewal within 14 days. ACCA uses a four-band sliding scale, floored at £100k for the smallest practices and capped at £1.5m for the largest under the formula. Excess bet uk sports betting sites not on gamstop capped at 2% of gross fee income. Six-year run-off mandatory; Bye-Law 8 disciplinary risk for any breach. The Institute of Chartered Accountants of Scotland regulates members and firms operating north of the border, but its rule set applies UK-wide to ICAS members in practice. AAT requires every Licensed Member to hold PII at not less than £50,000 per claim as a baseline, with the limit scaled to gross fee income: AAT licensed members may undertake bookkeeping, financial accounts, management accounts, payroll, VAT, personal tax and limited company tax (where the member's licence covers it), and limited company accounts. AAT does not licence audit work — a member intending to perform audit must hold registration with a Recognised Supervisory Body (ICAEW, ICAS, CAI or ACCA).

9. IFA Practising Certificate PI requirements

Watch out: an ICAS firm registered with HMRC for AML supervision but not for audit still has a Public Practice Regulations obligation — the PI rule does not turn on whether the firm does audit work. ICAS minimum mirrors ICAEW: greater of 2.5 × fees or £1.5m, capped at £3m on formula. Scots-law prescription rules differ from English limitation — this affects long-tail claim profile. Audit-registered ICAS firms face supervisory monitoring of claim notification. The Chartered Institute of Taxation regulates Chartered Tax Advisers and the firms they own or principal. six years of run-off following cessation; notification within 14 days of cancellation, decline or material restriction; Worked example: A newly licensed AAT bookkeeper with first-year gross income of £18,000 must hold £50,000 minimum.