The short answer is that it depends on your regulatory status, not on your job title. Some accountants are required by their professional body to hold professional indemnity (PI) insurance as a condition of licence. Others are not required but would be exposed without it. This entry sets out where each group sits and what the minimum limits look like.
The one-line answer by regulatory status
An ICAEW-chartered firm in public practice, an ACCA-chartered firm holding a practising certificate, and an AAT-licensed accountant or licensed bookkeeper all need PI insurance as a condition of continuing to practise. An unregulated bookkeeper who is not a member of a professional body is not required by law to hold PI, but sits fully exposed to any claim arising from the work. HMRC agent registration and money-laundering supervision do not, in themselves, mandate PI, but the anti-money-laundering supervisor you sit under may set its own expectations.
ICAEW-chartered firms — the PII Regulations 2020
Under the ICAEW Professional Indemnity Insurance Regulations 2020, every firm in public practice must hold PI cover for the full financial year. The minimum limit of indemnity is the greater of 2.5 times gross fee income or £1.5m each and every claim, subject to a maximum required limit for larger firms and permitted retention (excess) rules that scale with firm size. Smaller firms with modest fee income may operate to the £1.5m floor; larger firms scale up on the 2.5x multiplier. Cover must be placed with a participating insurer.
Run-off cover of at least six years applies on cessation of practice, so a chartered accountant who retires, merges or exits the profession must arrange continuing cover for claims made after the firm has closed its doors.
ACCA-chartered firms — the Global Practising Regulations
ACCA members holding a UK practising certificate must comply with the ACCA Global Practising Regulations. The minimum limit is £1m each and every claim, or 2.5 times fee income if higher, with maximum permitted excess levels set by ACCA. As with ICAEW, six years of run-off is expected after the practice closes.
AAT-licensed accountants and bookkeepers
The AAT Licensed Accountant Regulations and the equivalent bookkeeper regulations require any licensed member offering services to the public to hold PI cover for the full period of licence. AAT sets a minimum limit calculated on turnover bands, with the smallest practices sitting around £50,000 and scaling up sharply above £100,000 in fees. Most brokers place AAT licensees on limits well above the AAT floor because client contracts, HMRC exposure and lender due-diligence questionnaires routinely ask for £1m or more.
Unregulated bookkeepers and unlicensed practitioners
If you offer bookkeeping, tax return preparation or management accounts without being a member of a regulated body, no professional body rulebook forces you to hold PI. You are still fully liable in contract and in tort for the work. HMRC investigations, missed deadlines, incorrect submissions and disputed advice all give rise to claims that fall on the practitioner personally. PI cover is strongly advised for anyone in this position, and lenders, larger clients and framework contracts increasingly require it as a condition of engagement.
The practical case — why PI matters beyond the rulebook
Most claims against accountants do not arise from headline-grabbing failures. They arise from HMRC enquiries where the client blames the adviser for the additional tax, penalty or interest; from tax return errors picked up by a subsequent adviser; from going-concern disputes where a company director argues that the accounts painted a misleading picture; from missed elections and reliefs; and from delays that cost the client an opportunity. PI responds to defence costs as well as damages, and the defence costs alone on a contested HMRC-linked claim can run into the tens of thousands of pounds.
Run-off cover
Claims against accountants are made on a claims-made basis, which means the policy in force when the claim is notified is the policy that responds — not the policy in force when the work was done. Chartered bodies typically require six years of run-off after cessation. AAT licensees are expected to arrange equivalent protection. Without run-off, a claim notified two years after retirement finds no policy behind it.
A worked example
Consider a solo AAT-licensed accountant with £180,000 in annual fees, a client book of around 90 small owner-managed businesses and a plan to wind the practice down over the next decade. AAT requires PI as a condition of the licence. The broker reviews the fee income, the client contracts, the mix of tax and bookkeeping work, and places £1m each-and-every cover — comfortably above the AAT floor for that fee band and appropriate for the size of the client book. When the practitioner starts to think about retirement in due course, six-year run-off is arranged so that claims arising from work done during the practising years can still be notified after the doors close.
Related reading
For a fuller picture of PI cover for accountants, see the pillar guide at Accountants’ PI insurance – UK guide 2026. Related professions and topics: IFAs’ PI insurance, Solicitors’ PI insurance, Management consultants’ PI insurance, and the general Professional indemnity insurance – UK guide 2026.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority. Firm reference number 724952. This entry is general information, not advice on any particular policy.