ACCA PII vs ICAEW: two accountants regimes compared

Reviewed by Matthew Bartlett, Director · Last reviewed 2026-07-06

Two of the UK's largest chartered accountancy bodies — the Association of Chartered Certified Accountants (ACCA) and the Institute of Chartered Accountants in England and Wales (ICAEW) — regulate their members' professional indemnity insurance under separate rulebooks. Members carrying only ACCA credentials follow ACCA's Global Practising Regulations and the ACCA UK-specific Practising Regulations. Members carrying ICAEW credentials follow Bye-law 61 and the PII Regulations made by the ICAEW Council. Firms with a mix of ACCA and ICAEW members — or members holding both credentials — need to satisfy both regimes. The two regimes converge on the broad shape of what PII cover must look like but diverge on the detail. This entry compares them side by side.

What accountants' PII actually covers

Both regimes require civil-liability professional indemnity cover, and it helps to be clear on what that phrase buys. The policy responds to a claim alleging financial loss caused by the firm's negligent act, error or omission across the whole of its work — statutory audit, accounts preparation, tax compliance and planning, bookkeeping and payroll, corporate finance, advisory, forensic work and insolvency appointments. A modern wording also picks up breach of contract, breach of duty of care, breach of confidentiality, loss of documents and dishonesty of employees or partners, subject to the policy conditions. Just as significant is the cost of defending an allegation whether or not it succeeds: the defence alone can run to six figures before liability is established, which is why both regulators care about how a policy treats defence costs. Cover is written on a claims-made basis, responding to claims first notified during the policy year whenever the work was done, provided the matter falls after any retroactive date.

The compulsory limit

The ICAEW Regulations require the greater of £1.5 million or 2.5 times gross fee income. The ACCA Practising Regulations require a limit calibrated to fee income on a similar scaling principle but expressed in different bands, with a floor at £100,000 for very small practices and a scaling multiplier that rises through fee-income tiers. The upper reaches of the ACCA scale operate broadly comparably to the ICAEW 2.5× figure for firms of similar size, but at the smaller end the two regimes can produce meaningfully different minimums. A sole practitioner with £80,000 of fees would carry £1.5m under ICAEW and a materially lower minimum under ACCA. A £2 million practice would produce broadly similar minimums under the two regimes.

Where a firm has members from both bodies, the operative minimum for the firm is the higher of the two calculations. That is not a formal cross-regime rule — it is the practical consequence of the fact that a policy insufficient for one member is non-compliant for that member, so the firm's policy must satisfy the more demanding regime.

How limits and sums insured are sized

The compulsory minimum is a floor, not a recommendation, and sizing the limit a firm buys turns on a few factors. The first is the size of individual engagements: a limit calibrated only to fee income can be badly wrong for a firm whose typical client is small but whose advice moves large sums — a tax-planning error on a transaction worth many multiples of the annual fee is the classic mismatch. The second is aggregation: most accountancy wordings aggregate claims arising from one originating cause or source, so a single flawed piece of advice replicated across dozens of clients can present as one claim against one limit — a firm with standardised advice must think about the worst realistic aggregation, not the average claim. The third is how the limit interacts with defence costs — a "costs in addition" wording preserves the full limit for the claimant's loss and pays defence spend on top, while a "costs inclusive" wording erodes the limit as the defence runs. Sizing is a conversation about limit, aggregation and costs treatment together — not a single number from a fee multiplier.

Run-off

The ICAEW Regulations require two years of run-off cover from the date of cessation. ACCA's Practising Regulations require an equivalent period on cessation and impose the obligation on the practitioner or firm rather than on the incumbent insurer. Both regimes recognise that longer run-off may be prudent in specific circumstances but neither mandates it as a general rule. For firms with meaningful audit or tax-advisory exposure, extended run-off is a broker recommendation rather than a regulatory requirement under either regime. Run-off matters because cover is claims-made: a claim from the firm's final years may surface long after the practice has closed, and without a live run-off policy the former partners carry that exposure personally.

Approved insurers

Neither ACCA nor ICAEW publishes a closed list of approved insurers in the way the SRA does for solicitors. Both rely on criteria — regulatory authorisation (PRA or FCA or equivalent EEA authorisation), financial strength ratings meeting a stated threshold, wording that meets the substantive requirements of the regulations. The practical difference is that the ACCA regime imposes some additional wording obligations around defence costs and the scope of "civil liability" cover that a wording must include, and firms placing ACCA-compliant cover should check that the insurer's standard wording either matches the requirements or is endorsed to do so.

Reporting

Both bodies require firms to confirm PII compliance annually. The ACCA confirmation is via the annual return; the ICAEW confirmation is via the annual return of practising certificates. Late renewal — where a firm's cover has lapsed and a new policy is not yet in place — is a reportable breach under both regimes.

What ACCA does that ICAEW does not, and vice versa

Two points of substantive difference are worth flagging. ACCA's Practising Regulations attach specific requirements to firms undertaking insolvency work regulated under the Insolvency Act 1986, including additional PI cover for the insolvency practitioner's licence — this echoes rather than replaces the RPB's own insolvency PI rules (the ICAEW, IPA and ACCA are all recognised professional bodies for insolvency purposes). Firms with insolvency practitioners need to consider both bodies' rules.

ICAEW's regulations, meanwhile, contain explicit provisions on how PII cover interacts with the Registered Auditor status many ICAEW firms hold. Firms conducting statutory audit work must ensure the PII policy meets both the ICAEW PII Regulations and the audit-specific expectations. ACCA has parallel provisions for its audit-registered firms.

The exposures that drive accountancy claims

Understanding the rulebooks is easier once you can see the exposures they protect against. Tax is consistently the largest single source of accountancy claims — a missed election, a late filing that triggers a penalty, advice on a scheme HMRC later challenges — attractive to pursue because the loss is crisp. Audit and assurance work carries lower frequency but the highest severity, because a failure that misses a fraud or going-concern problem can expose the firm to the full value of a business. Accounts and advisory work generates a steadier stream of medium-sized claims, and cutting across all of it are two modern exposures — cyber and data, and dishonesty by an employee who diverts client funds. A firm's real risk profile is the mix of these, weighted by the sums its advice moves.

Claim scenarios and which cover responds

A few illustrative scenarios show how the pieces fit together. On a tax error — a corporation-tax return filed on a mistaken reading of a relief, an HMRC enquiry, and a client facing additional tax, interest and a penalty — the civil-liability section responds to the avoidable interest and penalty (the tax the client would always have owed is usually not recoverable) and defence-costs cover funds the experts arguing causation. On an audit failure that misses a material fraud, followed by collapse and a lender's claim, severity can approach the value of the lending, and the firm needs both an adequate limit and confirmation the wording sits alongside its Registered Auditor obligations. Where an employee diverts client funds, a wording extending to dishonesty of employees responds subject to the policy conditions. In each case the pattern is the same: the limit sets the ceiling, the aggregation basis sets how many claims share it, and the defence-costs treatment sets how much survives the fight.

Dual-regulated members and firms

A member holding both ACCA and ICAEW credentials — not uncommon — needs a policy that satisfies both regimes. In practice this is a wording question rather than a limit question: any wording that meets the more demanding of the two regimes on any given point (limit, run-off, defence costs, aggregation) satisfies the less demanding on that point. The firm's broker should be able to produce a written note confirming which regime drives each policy feature at renewal.

Worked example

Illustrative only. A three-partner firm has two ICAEW members and one ACCA member. Fee income £900,000. Under ICAEW: minimum £2.25m (2.5× fees). Under ACCA: minimum under ACCA's scaling regime for that fee band. Operative minimum is £2.25m — the higher figure. Broker places a £3m primary layer on a wording that includes explicit "defence costs in addition to the limit" language and meets both regimes' documentation requirements. Confirmation memo issued at binding.

Frequently asked questions

If my firm has only ACCA members, do I need to worry about the ICAEW rules?
No. A pure-ACCA firm satisfies its obligation by meeting the ACCA Practising Regulations. The comparison with ICAEW matters only where the firm has ICAEW members, holds ICAEW registrations such as audit, or has members carrying both credentials — in which case the more demanding requirement on each point governs.

Is the compulsory minimum enough on its own?
It is a regulatory floor, not a measure of adequacy. A firm whose advice moves sums far larger than its annual fees can be badly under-insured at the minimum. The right limit is a judgement about the size of individual engagements, the worst realistic aggregation and how defence costs are treated — not simply the fee multiplier.

Why does run-off cover matter if I'm winding the practice down cleanly?
Because cover is claims-made. A claim arising from your final years of work may not surface until after you have closed, and only a live run-off policy can respond. Two years is the minimum under both regimes; longer is often prudent where audit or tax-advisory work is involved.

What is the single most important wording feature to check?
How defence costs are treated. A "costs in addition" wording keeps the full limit available for the claimant's loss and funds the defence on top; a "costs inclusive" wording erodes the limit as the defence runs. For a firm carrying the minimum limit, that can decide whether cover survives a hard-fought claim.

Does one policy cover a firm with both ACCA and ICAEW members?
Yes, provided the wording meets the more demanding regime on every relevant point — limit, run-off, defence costs and aggregation. Your broker should confirm in writing which regime drives each feature, so the policy is demonstrably compliant for every member at renewal.