A PI policy trigger is the event that brings the cover into play and determines which year’s policy responds to a matter. In UK professional indemnity, which is written almost universally on a claims-made basis, the trigger is the claim being made against the insured during the policy period — or, where the wording allows, a circumstance being notified that may give rise to a future claim.
What “trigger” means in PI insurance
The trigger of a policy is the contractual event that activates cover. In other classes of insurance, the trigger is different. A property damage policy responds when damage occurs. A public liability policy on an occurrence basis responds when the injury or damage takes place. A claims-made PI policy responds when a claim is made against the insured during the period of cover.
This matters because professional services often involve a long gap between the work being done and the consequence emerging. An accountant might give tax advice in 2018 that HMRC challenges in 2025; an architect might design a building in 2010 that develops a defect in 2024; a consultant might recommend a strategy in 2020 that the client says caused loss only in 2026. Under a claims-made wording, the policy that responds is the one in force when the claim is made — usually 2025, 2024 and 2026 in those examples — not the policy that was in force when the work was done.
The corollary is the retroactive date. A claims-made policy normally covers claims first made during the policy period that arise from professional work done after a retroactive date. Work done before the retroactive date is excluded. See retroactive date and claims-made vs occurrence.
The trigger therefore answers a simple question: which year’s policy is on the hook for this matter? In claims-made PI, the answer almost always turns on when the claim was made or notified, not when the work was done.
How the PI trigger works in practice
Three operational features matter.
Claim made against the insured. Most UK PI wordings define the trigger as a written demand for compensation, civil proceedings, or a written allegation of wrongful act made against the insured during the period of cover. The policy in force on that date is the one that responds. The policy that was in force when the underlying work was done is not relevant to the trigger — it remains relevant only if a circumstance was notified to it at the time, which falls under the second mechanism below.
Circumstance notification. Most claims-made PI policies allow the insured to notify a circumstance that the insured believes may give rise to a future claim. If a circumstance is notified during the period of cover, any future claim arising from that circumstance is treated as if it were made during the year in which the circumstance was notified. The trigger is, in effect, brought forward to the notification. This is sometimes called the “deeming” provision. It is a critical mechanism because it protects the insured from the risk that a known but un-crystallised matter falls into a later policy year — or no policy year at all — when the claim eventually arrives.
Discovery, awareness and continuity. Different wordings phrase the trigger in slightly different ways. Some refer to “claims first made against the insured and notified to the insurer during the period of insurance”. Others use “claims first made or circumstances first notified”. The placement of “first” matters: it determines that the cover is for the first time a claim or circumstance comes forward, not for repeat notifications. The trigger therefore links closely with the duty to notify, which is a separate contractual obligation. See notification deadline.
Worked example
A 25-partner UK accountancy firm has held PI cover with the same broker but different insurers across three policy years:
- 2021–22: Insurer A, £5m limit
- 2022–23: Insurer B, £5m limit
- 2023–24: Insurer C, £5m limit
A client whose tax return the firm prepared in early 2022 receives an HMRC enquiry in October 2023. By April 2024 the client has written to the firm alleging negligence and demanding £400,000.
Under the claims-made trigger, the policy that responds is the one in force when the claim was made — April 2024 — i.e. Insurer C’s 2023–24 policy, not Insurer B’s policy that was in force when the original tax return was prepared.
If, however, the firm became aware of a potential issue in November 2022 — say, an internal review flagged the original return as questionable — and notified that circumstance to Insurer B at the time, the position changes. The future claim arising from that circumstance would be treated as made in the 2022–23 policy year and would attach to Insurer B’s policy under the deeming provision, even though the actual claim came later.
This is why the circumstance notification mechanism matters. Without it, the firm has no control over which insurer is on cover when the claim eventually crystallises — and the wording, limit and excess of that future year’s policy may be materially different from the policy on cover when the firm first knew there was a problem.
The retroactive date adds a further layer. If the firm’s 2023–24 policy has a retroactive date of January 2020, then claims first made in 2023–24 arising from work done after January 2020 are covered, but a claim arising from work done in, say, 1998 would fall outside the retroactive date and be excluded — regardless of when the claim was made.
When the trigger matters most
The trigger and its mechanics come into focus in three situations.
Switching insurers between policy years. Each change of insurer introduces a continuity question. The new insurer typically requires confirmation that no known circumstances are unreported. If a circumstance was known and not notified to the previous insurer, the new insurer may decline cover for the eventual claim, and the previous insurer may decline because the circumstance was not notified within its policy period. Continuity needs to be managed deliberately.
Long-tail professional work. Accountants advising on long-term tax structures, architects involved in multi-year developments, and consultants on multi-year strategy engagements all have a long tail between work and consequence. The trigger means each year’s policy needs to be considered when a problem emerges in a later year.
Cessation, run-off and gaps. When a firm ceases trading, the live policy ends. Run-off cover provides a continuing claims-made trigger for a defined number of years after cessation. A gap in cover — even short — can leave a claim made during the gap without a responding policy. See run-off cover.
Common variations and market wording
UK PI wordings express the trigger in several ways:
- “This policy applies to claims first made against the insured and notified to the insurer during the period of insurance.” Standard claims-made trigger with combined claim-and-notification language.
- “Or to circumstances first notified to the insurer during the period of insurance that may give rise to a claim.” Adds the circumstance notification mechanism.
- “Provided the act, error or omission giving rise to the claim occurred after the retroactive date.” Combines the trigger with the retroactive date condition.
- “Discovery wording.” Less common in PI but used in some related classes (crime, certain professional risks); cover is triggered by discovery of the loss rather than by a claim being made. UK PI is rarely written on a pure discovery basis.
- “Reporting period.” Extends the time within which a claim must be reported to be treated as a claim made within the policy period. See extended reporting period.
- “Deemed claim.” Used in some wordings to describe a future claim arising from a notified circumstance, treated as made in the policy year of the notification.
The wording of the trigger is short but decisive. It governs which policy year responds and is the single most important paragraph to read alongside the notification clause when handling a potential claim.
Related concepts
- Claims-made vs occurrence — the underlying structural difference.
- Retroactive date — the earliest date of work covered.
- Circumstance notification — how a known issue is locked into a particular year’s policy.
- Notification deadline — the time limit for telling the insurer.
- Extended reporting period — buying additional time to report claims after the policy ends.
Frequently asked questions
What triggers a claims-made PI policy?
A claim being made against the insured during the period of insurance, or — in most wordings — a circumstance being notified during the period that may give rise to a future claim. The wording specifies which mechanism applies and the precise definitions of “claim” and “circumstance”.
Does the work date matter for the trigger?
Only insofar as it sits after the retroactive date. The trigger itself looks at when the claim is made or circumstance notified, not when the underlying work was done. Two different policy years can be on cover for two different claims arising from the same piece of work, depending on when each claim is made.
What is a circumstance notification?
A notification to the insurer of an event, error, problem or potential issue that may give rise to a future claim. If accepted, the future claim is treated as if it had been made in the year of the circumstance notification, locking the matter into that year’s policy.
What is the deeming provision?
A wording mechanism that deems a future claim to have been made in the year a related circumstance was notified. It is what makes circumstance notification effective: without deeming, the eventual claim would attach only to the policy in force when the claim itself is made.
What is the difference between a claim and a circumstance?
A claim is a written demand, civil proceeding or written allegation of wrongful act made against the insured. A circumstance is an event or fact — known to the insured — that may give rise to a future claim, but where no claim has yet been made. The policy wording defines both, and the definitions vary slightly between insurers.
What happens if I don’t notify a circumstance I knew about?
Two risks. First, when the eventual claim is made, the policy in force at that point may have a continuity exclusion for known but unreported circumstances. Second, the previous insurer may decline cover because the circumstance was known but not notified within its policy period. A known circumstance that is not notified can fall between two policies, leaving the firm uncovered.
Does the trigger affect run-off cover?
Yes. Run-off cover is a continuation of the claims-made trigger for a defined number of years after the firm ceases trading. The trigger still requires a claim to be made (or circumstance notified) during the run-off period; claims first made after run-off expires are not covered. The retroactive date carried forward into run-off determines how far back work is covered.
Are there UK PI policies that are not claims-made?
The overwhelming majority of UK PI is claims-made. Occurrence-based PI policies exist in some specialist or legacy contexts but are rare. The MTC and ARB primary wordings are claims-made, and the standard Lloyd’s-market PI wordings follow the same structure.
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About Apex Insurance Brokers Ltd
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.