Category: Insurance definitions · Reviewed by Amy Price, Account Executive · Last reviewed May 2026
The retroactive date on a professional indemnity policy is the earliest date back to which the policy will respond to past work. Anything done before that date — even if the claim is made during the current policy year — is outside cover. Because almost all UK PI is written on a claims-made basis, the retroactive date is one of the most important dates on the schedule.
PI policies in the UK are almost universally written on a claims-made basis. The policy in force when a claim is notified is the policy that responds — regardless of when the underlying work was done. The retroactive date is the bracket on the other end: it sets the earliest point in time at which the work covered by the policy could have been performed.
In practical terms, the policy responds to a claim if:
A claim arising from work done before the retroactive date falls outside cover. The most common retroactive date on a continuously insured firm is the date the firm first took out PI cover (often expressed as “full retroactive” or “unlimited retroactive”). On a newly arranged policy, the retroactive date may be set to the inception date itself — meaning no past work is covered — or to a defined earlier date negotiated with the insurer.
The concept exists because claims-made cover, by definition, picks up claims notified in the period, including for very old work. Without a retroactive date, an insurer would be on the hook for any historic act ever performed by the insured. The retroactive date is the boundary.
Several practical features matter:
A UK firm of accountants begins trading in March 2017 and buys PI cover at inception. The retroactive date on the original policy is the inception date — March 2017 — and is preserved every year because the firm renews with the same insurer.
In May 2026 the firm switches to a new insurer to save approximately 15% on premium. The new insurer’s quotation lists a “three-year retroactive date” — i.e. May 2023. This is offered because the new underwriter is uncomfortable taking on historic exposure on work the firm did in 2017–2023 without additional review or premium loading.
Three months into the new policy year, a former client notifies the firm of a £180,000 claim arising from a tax-advice file dated June 2019. Under the new policy, the work was performed before the May 2023 retroactive date and is outside cover. The firm checks the old insurer’s position: the matter was not notified during the previous policy year, so it cannot trigger the old policy either.
The firm is uninsured for the £180,000 claim plus defence costs that might add £40,000 or more.
What should have happened: the broker should have either negotiated full retroactive cover with the new insurer (with whatever additional premium that required), bought “prior acts” cover from the new insurer back to March 2017, or, if neither was acceptable, advised the firm to remain with the existing insurer to preserve the retroactive date. The 15% premium saving on £8,000 of annual premium — £1,200 — is dwarfed by the loss on a single uninsured claim.
This is not a hypothetical pattern. It is one of the most common avoidable PI losses in the UK market, and it almost always traces back to a retroactive date that was changed without the firm fully understanding the consequences.
The retroactive date matters most:
At every change of insurer. The single highest-risk moment. The new schedule must be checked to confirm the retroactive date is at least as broad as the previous policy’s, or that the gap is being filled by prior acts cover or by continuing run-off with the previous insurer.
On takeover, merger or restructure. Where one firm absorbs another, the acquiring firm’s PI may not have a retroactive date that extends back to cover the acquired firm’s historic work. Bolt-on run-off or a specifically negotiated extension is often needed.
For newly qualified or newly formed practices. A new firm whose principals have prior practice elsewhere may need to ensure that either the new firm’s policy picks up past work (with an earlier retroactive date), or the previous firm’s policy is in run-off to cover claims arising from the principals’ earlier work.
For regulated professions. ARB, SRA and other regulators expect retroactive cover to extend across the architect’s or solicitor’s past work. A restrictive retroactive date can put the practitioner in breach of the regulatory minimum.
When considering ceasing practice. Run-off cover must be arranged with a retroactive date that goes back to the start of the firm’s working period — not just from the date of ceasing. Otherwise, the run-off does not cover old work.
UK PI wordings express retroactive date in several ways. Common phrases:
The schedule is what governs. Marketing language about “full retro” or “prior acts” must be confirmed in the bound policy wording.
What does “retroactive date” mean on my PI policy?
It is the earliest date back to which the policy responds to past work. A claim arising from work performed before the retroactive date is outside cover, even if the claim is notified during the current policy year. The retroactive date is a defining feature of claims-made PI and sits on the policy schedule, usually expressed as a calendar date or as “unlimited” / “no retroactive limitation”.
What happens to my retroactive date when I change insurer?
The new insurer sets the retroactive date on the new policy. It should be at least as broad as the previous policy’s retroactive date, ideally with full or unlimited retroactive cover. If the new policy carries a more restrictive retroactive date, the firm has lost cover for past work between the new retroactive date and the previous one. Always check the new schedule and request prior acts cover if needed.
Is the retroactive date the same as the inception date?
No. The inception date is when the current policy year begins. The retroactive date is the earliest date the policy will respond back to. They can coincide — a policy with retroactive date equal to inception covers no past work — but they are conceptually different.
Can a retroactive date be unlimited?
Yes. Many UK PI policies for established firms carry “no retroactive limitation” or “unlimited retroactive”, meaning all past work is potentially covered subject to the claim being notified during the policy period. This is the broadest position and is preferred for firms with long working histories.
Does retroactive cover apply to all past work or only insured past work?
It applies to past work performed by the insured on or after the retroactive date, regardless of whether the firm was insured at the time. The policy in force when the claim is notified is the one that responds. This is why a firm with a long retroactive date is protected even on years where its earlier insurer may have changed multiple times.
What is prior acts cover?
Prior acts cover is a specific endorsement or extension that broadens the retroactive date to cover work performed by the insured or by a defined predecessor entity before the standard retroactive date. It is commonly used after a takeover or merger, or when a firm changes insurer and wants to preserve the longer retroactive date the previous insurer had granted.
Does the retroactive date apply to run-off cover?
Yes. Run-off cover must have a retroactive date that goes back across the firm’s working period, not just from the date of ceasing trading. Otherwise, the run-off only covers claims arising from work done from the ceased date onwards, which is meaningless because the firm is no longer trading. Brokers placing run-off should confirm the retroactive date explicitly.
What if I cannot get full retroactive cover at renewal?
This sometimes happens — for example, where the firm’s claims experience or the nature of recent matters concerns the new underwriter. Options are: stay with the current insurer to preserve the retroactive date; negotiate a defined earlier retroactive date with the new insurer in exchange for additional premium; or arrange a separate run-off policy with the previous insurer for the period the new policy will not cover. Each option has trade-offs to work through with the broker.
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Apex Insurance Brokers Ltd is a Bristol-based insurance broker authorised and regulated by the Financial Conduct Authority (firm reference number 724952). The company is registered in England and Wales under Companies House number 07014570. Contact: info@apexinsurancebrokers.co.uk | 0117 325 0027.
Last reviewed: May 2026 by Apex Insurance Brokers Ltd.
Important: this article is general information, not advice on your specific circumstances. For advice on PI insurance for your firm, contact us on 0117 325 0027 or info@apexinsurancebrokers.co.uk.
Apex Insurance Brokers serves UK professional services firms and commercial businesses. Call 0117 325 0027, email hello@apexinsurancebrokers.co.uk, or request a quotation.
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