Retroactive Cover Explained: Why It Matters for Accountants and Bookkeepers
Retroactive cover decides whether your professional indemnity policy pays for mistakes made before the current policy began. Because PI responds to claims made during the policy year, the retroactive date sets how far back your past work stays protected. Accountants and bookkeepers feel this more than most, since HMRC can assess a careless error up to six years after the tax year ends. Set the date too recently and a valid claim can land with no insurer behind it.
Key Takeaways
The retroactive date is the earliest point from which past work is covered.
ICAEW rules in force from 1 October 2026 require established firms to hold a retroactive date at least six years before the current policy.
AAT expects licensed members to hold fully retroactive cover.
Switching insurers or letting a policy lapse can reset the date and leave years of work uninsured.
Tax errors often surface years after the work, so short retroactive cover is a real risk for accountants.
What Is Retroactive Cover in Professional Indemnity Insurance?
Retroactive cover extends a professional indemnity policy to claims arising from work done before the policy started, back to a fixed point called the retroactive date. Anything earlier sits outside the policy, however strong the claim. Because PI works on a claims-made basis, the policy in force when the claim arrives responds.
Take a policy running from 1 November 2026 with a retroactive date of 1 November 2020. A claim made in March 2027 about accounts prepared in 2021 falls inside the cover. The same claim about accounts from 2019 would not, even though the policy was live when the client complained.
A policy with no retroactive date, often sold as unlimited retroactive cover, protects past work no matter how old. Our guide to what professional indemnity insurance covers explains the rest of the policy.
Why Does Retroactive Cover Matter for Accountants and Bookkeepers?
Accountancy and bookkeeping mistakes tend to surface late. A miscoded VAT return can sit unnoticed until HMRC opens an enquiry. HMRC can raise a discovery assessment up to four years after the tax year ends, six years if the loss was careless and 20 years if it was deliberate.
Civil claims run longer still. In England and Wales, a client normally has six years to sue in negligence or contract, or three years from discovering hidden damage, subject to a 15-year longstop. A return prepared this year could still produce a claim well into the 2030s. If your professional indemnity policy's retroactive cover does not reach that far back, the bill falls on your practice.
What Do ICAEW and AAT Require?
Both bodies make retroactive cover a condition of compliant PI. Under ICAEW's PII Regulations, in force from 1 October 2026, a firm's retroactive date must be at least six years before its current policy, or its start in practice if that is more recent.
AAT requires licensed members' cover to be fully retroactive, so it covers losses that have happened but have not been reported yet. At renewal, the retroactive date on your schedule deserves the same attention as the limit.
When Can Past Work Lose Its Cover?
Retroactive dates rarely disappear through one dramatic decision. They tend to slip during ordinary business changes, such as:
moving to an insurer that resets the retroactive date to its own start date
letting cover lapse between policies, even for a few days
incorporating or merging, where the new entity starts a fresh policy
closing or selling the practice without run-off cover
Most of these can be planned around. Before you switch insurers, ask your broker to confirm in writing that the new policy keeps your existing retroactive date. A change in legal structure partway through the policy year can go through as a mid-term adjustment, which is the time to check that the date carries over.
What This Means for Professional Bodies
Members often discover retroactive dates when they change insurers or retire, and by then a gap is expensive to fix. Professional and trade associations that explain the detail in plain terms help members spot the problem early.
Organisations on the Parliament Hill platform can add professional indemnity cover to their member benefits. Our partners Marsh Commercial, Caunce O'Hara and Markel Direct provide the cover and handle quotes, policies and claims. Cover, limits and exclusions vary, so members should read the policy wording before buying.
Add Professional Cover to Your Member Benefits
Partner professional indemnity cover sits next to IT support and everyday member discounts on one platform. Book a demo and see it through your members' eyes.
FAQ
How long should run-off cover last after I retire?
ICAEW expects a closing practice to keep compliant cover for at least two years, then take all reasonable steps to extend it for four more. AAT recommends keeping PII for at least six years after you stop being a licensed member.
Can I get retroactive cover on my first professional indemnity policy?
The retroactive date usually matches the day you started trading, which ICAEW accepts for new practices. If you did paid work before your first policy, ask whether the insurer will backdate cover. Expect to declare that you know of no claims or circumstances.
What should I do if I spot a past mistake before renewal?
Tell your broker or insurer and notify it as a circumstance while the policy is still live. A claims-made policy can then respond to a later claim, which matters most if you are about to switch insurers.
Sources
ICAEW, Professional Indemnity Insurance Regulations, effective 1 October 2026, icaew.com
Taxes Management Act 1970, sections 34 and 36, legislation.gov.uk
Limitation Act 1980 and Latent Damage Act 1986, legislation.gov.uk
AAT, Professional indemnity insurance (PII), aat.org.uk
Parliament Hill is authorised and regulated by the Financial Conduct Authority for non-investment insurance mediation and credit broking only. You can check this out on the Financial Services Register by visiting register.fca.org.uk, under register number 308448. Professional indemnity insurance is provided by our partners Marsh Commercial, Caunce O'Hara and Markel Direct. Marsh Commercial is a trading name of Marsh Ltd. Marsh Ltd is authorised and regulated by the Financial Conduct Authority for General Insurance Distribution and Credit Broking (Firm Reference No. 307511). Not all products and services are regulated by the FCA. Caunce O'Hara & Company Limited is authorised and regulated by the Financial Conduct Authority (Firm Reference number 306183). To verify this visit www.fca.org.uk/register. Markel Group Inc. is the ultimate holding company for Caunce O'Hara & Company Limited. Markel Direct is a trading name of Markel International Insurance Company Limited, which is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and Prudential Regulation Authority (Financial Services Register reference number 202570).
About author
Christina Loukissa is the Growth Marketing Lead at Parliament Hill, where she helps membership organisations grow, retain, and energise their communities through targeted perks and benefits strategies.
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