Professional Indemnity Insurance for Accountants: ACCA Requirements Explained

Professional indemnity insurance (PII) is a mandatory requirement for accountants in practice, not an optional extra. If you're studying toward ACCA and planning to set up in practice, or you're already qualified and choosing cover for the first time, understanding what your professional body actually requires — rather than just what an insurer recommends — is essential.

What is professional indemnity insurance?

PII protects accountants and accountancy firms against claims of negligence, error, or breach of professional duty made by clients or third parties. If a client suffers a financial loss because of advice you gave, or work you carried out, PII covers the cost of defending the claim and any damages or settlement — costs that could otherwise be ruinous for a sole practitioner or small firm.

ACCA's minimum limits of indemnity

ACCA sets minimum PII requirements for members in practice based on the firm's total income. For firms with total income below £600,000, the minimum limit of indemnity must be at least the greater of two and a half times the firm's relevant total income, or £100,000 (or the euro equivalent). For firms with total income of £600,000 or more, the minimum limit is a fixed £1.5 million (or euro equivalent) per claim. "Total income" is defined broadly — it includes professional charges, commissions retained, and importantly, fees received for work that has been sub-contracted out to another firm, not just fees for work done in-house.

Excess and claim basis

ACCA generally requires cover on an "each and every claim" basis rather than an aggregate basis, meaning the limit of indemnity applies separately to each claim rather than being shared across all claims in a policy year. The maximum uninsured excess permitted is £20,000 (or euro equivalent) per principal for each and every claim. Aggregate-basis cover is permitted in specific higher-risk areas — such as cyber, tax planning, and financial services work — where each-and-every-claim cover isn't reasonably available.

Run-off cover: the rule practitioners most often overlook

PII policies are written on a "claims-made" basis, meaning a policy responds to claims made while it's in force, regardless of when the underlying work was carried out. This creates an obvious gap when a practitioner retires, merges, or otherwise stops practising — a client could still bring a claim years later, once there's no active policy to respond to it. To close that gap, practitioners ceasing practice are required to maintain run-off cover for six years from the date they stop practising, matched to the same minimum limits that applied while they were trading.

Why the requirement exists

Mandatory PII exists to protect the public, not just the practitioner. Clients relying on an accountant's advice need confidence that redress is available if that advice turns out to be negligent, and professional bodies enforce minimum PII as a condition of a firm holding a practising certificate. Firms found to be operating without adequate cover can face regulatory action, including restrictions on practising, in addition to the direct financial exposure of an uninsured claim.

Practical considerations when arranging cover

Beyond meeting the regulatory minimum, firms should think about whether their actual risk profile justifies cover above the minimum limit — a firm doing complex tax planning, financial services work, or advisory for high-value transactions carries materially more claims risk than a firm doing routine compliance work, even at similar fee income. It's also worth checking a policy's exclusions carefully, since some activities (such as certain regulated financial advice) may need separate or additional cover, and confirming the insurer is on your professional body's approved list where one exists, since cover from a non-approved insurer may not satisfy the regulatory requirement even if the policy itself looks adequate on paper.

What isn't covered

PII is not a substitute for good risk management. Policies typically exclude deliberate wrongdoing, fraud, and claims a practitioner already knew about before taking out cover, and most policies require prompt notification of any circumstance that could give rise to a claim — delaying notification can itself jeopardise cover. Firms often pair PII with strong engagement letters, clear scope-of-work documentation, and file review processes, since insurers increasingly price cover based on the quality of a firm's risk management, not just its size and fee income.

FAQs

Is professional indemnity insurance a legal requirement or a professional body requirement? For accountants, it's typically mandated by professional bodies such as ACCA and ICAEW as a condition of holding a practising certificate, rather than a general legal requirement, though some regulated activities carry their own statutory insurance obligations.

What happens if a firm's income grows during the policy year? Firms should review their limit of indemnity regularly, since it's based on income — a firm that grows past £600,000 in total income during the year should move to the fixed £1.5 million minimum at renewal.

Do sole practitioners need PII, or only firms with staff? Sole practitioners are just as exposed to negligence claims as larger firms and are equally required to hold adequate cover, including run-off cover if they stop practising.

Professional indemnity insurance is one of the less glamorous parts of setting up or running a practice, but getting the limits, excess and run-off arrangements right is fundamental to both regulatory compliance and genuine protection against the financial impact of a claim.