Category: Insurance definitions · Reviewed by Tim Roche, Director · PI & Commercial · Last reviewed May 2026
An aggregate limit in professional indemnity insurance is the total amount the insurer will pay out across all claims notified during a single policy period. Once the aggregate is exhausted, the policy stops responding to further claims that year — regardless of how many separate matters arise. It is one of the two main ways PI limits are structured in the UK market.
In PI wording, the limit of indemnity tells you the maximum the insurer is committed to pay. “Aggregate” is a structural word that describes how that maximum is applied across the policy year. An aggregate limit pools all claims notified during the period of insurance into one shared bucket. If the policy is written with a £1m aggregate limit and three claims are notified — at £400,000, £350,000 and £300,000 — the first two pay in full and the third leaves the firm exposed for the £50,000 shortfall after the aggregate is exhausted.
This is contrasted with an each-and-every-claim limit, where the insurer commits to pay the limit afresh on each separate claim. Several regulated UK professions — solicitors under the SRA minimum terms, and architects under ARB’s published criteria — require that primary PI is written on an each-and-every-claim basis precisely because aggregate cover can run out at the worst possible moment.
Aggregate limits are common on top-up or excess layers, on some unregulated professions’ wordings, on certain extensions to a core policy, and on package or combined-cover products aimed at smaller firms.
When a claim is notified, the insurer reserves a sum from the aggregate to cover the likely settlement and defence costs. If a second claim is notified later in the year, the available aggregate is the original limit minus the reserve on the first claim (plus or minus reserve adjustments as the first claim develops). Once the aggregate is exhausted, the policy is, in plain terms, used up for that year.
Several practical features follow from this:
Consider a small UK consultancy with a £100,000 fee income buying £500,000 of PI cover and carrying a £2,500 excess. Two claims are notified during the policy year:
Under an aggregate £500,000 limit, defence costs inside, the insurer’s exposure is capped at £500,000 total. The two claims together cost £545,000 in settlement and defence. The insurer pays £500,000 (after the firm’s £2,500 excess on each claim is netted off where applicable); the firm is exposed for the £45,000 shortfall. Any third claim that year hits an exhausted policy.
Under an each-and-every £500,000 limit, defence costs outside, the insurer pays Claim A in full (£180,000 indemnity plus £45,000 costs outside), and Claim B in full (£260,000 plus £60,000 costs outside). The firm is responsible only for the £2,500 excess on each. A third claim that year would still have a fresh £500,000 of cover available.
The figures are illustrative — real-world settlements and costs vary widely — but the structural point is what matters: the same headline “£500,000 limit” delivers very different protection depending on whether it is aggregate or each-and-every, and whether defence costs sit inside or outside.
Aggregate limits matter most in three situations:
Multiple-claim years. Some firms see a cluster of notifications in a single year — a systemic process error, a former employee whose files trigger several complaints, a particular project where multiple counterparties claim. On an aggregate wording, the second and subsequent claims share the same cap. On an each-and-every wording they do not.
Excess and top-up layers. Above the primary policy, excess layers and top-up cover are commonly written on an aggregate basis. A firm with £1m primary cover and £4m excess cover written aggregate has £1m available on each claim through the primary plus a single £4m pool above that, shared across all claims in the year.
Smaller firms and unregulated professions. Where the regulator does not mandate each-and-every cover, package and combined-cover products often default to aggregate limits at the lower end of the market because it is cheaper to underwrite. Firms should not assume their policy is each-and-every just because their previous one was.
UK PI wordings use a range of phrases for the same underlying concepts. Look for:
The wording on the schedule is what governs. Brokers and firms should not rely on summary documents or quote sheets if a specific structure is needed.
Is an aggregate limit worse than each-and-every?
It is less protective for the same headline figure, because the total annual payout is capped. Whether it is “worse” depends on the firm’s risk profile. A practice that historically notifies one claim every few years gets very similar protection from a £1m aggregate as from a £1m each-and-every. A practice that has had multiple claims in a year — or could plausibly do so — gets materially less protection from the aggregate version. The price difference is usually modest.
Are aggregate limits allowed under SRA minimum terms?
The SRA’s minimum terms and conditions for solicitors’ PI require that the primary cover is written on an each-and-every-claim basis, with no aggregate cap. Excess layers above the SRA minimum are not bound by the same rule and are commonly aggregate. ARB’s published PI criteria for architects similarly expect each-and-every primary cover. Other regulators take different positions; the relevant minimum terms should be checked for each profession.
What is “one automatic reinstatement”?
A reinstatement provision means that after the aggregate limit is exhausted by paid or reserved claims, the insurer agrees to provide a fresh aggregate for the remainder of the policy year. “One automatic” means a single reinstatement is provided automatically, without negotiation. Some wordings provide it free; others charge an additional premium when triggered. Reinstatement does not turn an aggregate policy into an each-and-every policy; it gives one extra bite at the cap.
How are defence costs treated under an aggregate limit?
Defence costs may sit inside or outside the aggregate limit, and this is set out in the policy schedule. Inside-the-limit costs erode the available indemnity, so a £1m aggregate with inside costs can be largely consumed by defending a single substantial claim before any indemnity is paid. Outside-the-limit costs do not erode the indemnity available. Read the schedule, not the marketing summary.
Can I have a mix of aggregate and each-and-every cover?
Yes — and it is common. The primary policy may be each-and-every; an excess layer above may be aggregate. A specific extension within an each-and-every policy may itself be aggregate (for example, regulatory defence costs cover, or cyber). The schedule should be read section by section to understand the structure of each.
Does the excess apply per claim or per aggregate?
Excess is usually applied per claim, not per aggregate. On the worked example above, the firm pays the £2,500 excess on Claim A and again on Claim B. Some specialised wordings apply a single annual excess for related matters, but per-claim excess is the market norm. The schedule will set this out under the excess or deductible section.
What happens if my aggregate is exhausted mid-year?
If the aggregate is exhausted and no reinstatement applies, the policy will not respond to further claims notified during that policy period. The firm bears further claims itself unless top-up cover is in place. New cover bought mid-year would typically not respond retrospectively to facts already in existence. This is one of the practical reasons each-and-every cover is required at primary level in regulated professions.
Does an aggregate limit affect run-off cover?
Run-off cover is normally arranged for a defined number of years after a firm ceases trading, often with its own aggregate limit for the whole run-off period or with a per-year aggregate. The run-off aggregate is separate from the last working policy’s aggregate. Firms approaching closure should ask the broker to set out the run-off limit structure explicitly. See run-off cover.
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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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