Aggregate limit

An aggregate limit is the maximum total amount an insurer will pay across all claims made or notified under a liability policy during the policy period, irrespective of the number of separate claims.

Definition §

The aggregate limit is the period-wide ceiling on the insurer's liability. It sits alongside the per-claim limit. Where the per-claim limit controls the most that the insurer will pay on any single claim, the aggregate limit controls the most the insurer will pay across the policy period as a whole, regardless of how many claims are made and whether or not those claims are aggregated together by the aggregation clause. ^[1]

In contractual terms the aggregate limit functions as a cap that is consumed cumulatively. Each payment made by the insurer during the policy period — whether damages, settlement, defence costs (if included) or third party costs — erodes the aggregate. Once the aggregate is exhausted, the insurer has no further liability under the policy for the remainder of the period, even if further claims are properly notified within time. ^[2]

The interaction between the per-claim and aggregate limits is the most commercially important feature of the policy's financial architecture. A policy with a high per-claim limit but a low aggregate limit will respond fully to one large claim but offers thin coverage for multiple claims. A policy with a per-claim limit equal to the aggregate limit (a "one limit" policy) gives full per-claim cover for a single claim but no coverage for any subsequent claim. A policy with a per-claim limit and a generous multiple of the per-claim limit as aggregate (for example a 1:3 ratio) gives the insured headroom for multiple incidents. ^[3]

Legal / Regulatory basis §

Aggregate limits are a feature of contract rather than of statute. They are, however, regulated indirectly through the minimum cover requirements imposed by professional bodies and the FCA.

The FCA Handbook at MIPRU 3.2.7R sets minimum levels of professional indemnity insurance for insurance intermediaries, expressed both as a per-claim minimum and an aggregate minimum. The aggregate minimum is calibrated to the firm's annual income. ^[4]

The SRA Minimum Terms and Conditions of Professional Indemnity Insurance for solicitors take a different approach. Cover at the qualifying minimum is required for any one claim, and the MTC at the primary layer do not impose an aggregate limit on most types of claim, although excess layer cover above the qualifying minimum routinely contains aggregate limits. ^[5]

The RICS minimum policy wording requires aggregate cover for surveyors calibrated to firm income. Other professional regulators take broadly similar approaches.

The Insurance Act 2015 provides the general statutory framework for the construction of liability policies and the law on warranties and terms, against which the operation of the aggregate limit is interpreted. ^[6]

The case law on aggregate limits is mostly embedded in the aggregation cases. The Supreme Court in AIG Europe Ltd v Woodman [2017] UKSC 18, the House of Lords in Lloyds TSB v Lloyds Bank Group Insurance [2003] UKHL 48 and the House of Lords in Axa Reinsurance (UK) plc v Field [1996] 1 WLR 1026 all touch on the function of the aggregate limit as part of the broader limits architecture, although their analytical focus is on the unifying factor that determines how many separate claims there are for limits purposes. ^[7]

How it works in practice §

Aggregate limits drive both placement strategy and claims management.

In placement, the choice of aggregate limit depends on the insured's exposure to frequency. A professional services firm exposed to a small number of high-severity claims may favour a high per-claim limit relative to a modest aggregate. A firm exposed to a large number of low-severity claims may favour a generous aggregate. The aggregate is also a regulatory minimum for many regulated activities, and placement must satisfy the relevant rules whatever the insured's commercial preferences. ^[8]

In claims management, the aggregate limit interacts with the per-claim limit, the excess and the aggregation clause to determine the insurer's exposure to any given combination of claims. A series of small claims may consume the aggregate without any individual claim approaching the per-claim limit. Conversely, a single large claim may consume both a single per-claim limit and a substantial slice of the aggregate.

The aggregate is also the touchstone for the question of when excess layer cover engages. Excess layers commonly attach by reference to "exhaustion" of the underlying layer. Where the underlying layer has an aggregate limit, that aggregate must be exhausted before the excess layer responds. The drafting of the exhaustion provision and the relationship between the underlying aggregate and the excess layer is closely scrutinised in claims work. ^[9]

Some policies include a reinstatement feature whereby the aggregate limit can be refreshed during the period, either automatically or on payment of an additional premium. The terms of reinstatement vary and are an important element of placement.

Common variations §

The simplest variation provides a per-claim limit equal to the aggregate limit. The cover is one limit for one claim; once consumed there is nothing left.

The most common professional indemnity structure provides a per-claim limit and an aggregate limit equal to one or two times the per-claim limit. Higher multipliers are available at higher premium.

Some wordings provide a per-claim limit without any aggregate restriction on certain types of claim. SRA Minimum Terms primary layer cover for solicitors operates in this way for many categories of liability, although excess layers commonly carry aggregate limits.

Reinstatement structures vary. Some policies provide one automatic reinstatement after exhaustion; others provide multiple reinstatements subject to a hard outer cap. Reinstatements are typically more common in property and cyber covers than in PI.

Some directors' and officers' policies operate with a combined per-claim and aggregate limit. Others operate with separate limits for different categories of insured (Side A for individual directors; Side B and Side C for the corporate).

Example §

A consultancy firm holds professional indemnity insurance with illustrative limits of £2,000,000 per claim and £6,000,000 in the aggregate, with a £25,000 per-claim excess. Defence costs are payable inside the limit.

During the policy period the firm notifies four unconnected claims. Claim one is settled for £1,800,000 inclusive of £300,000 defence costs. Claim two is settled for £2,000,000 inclusive of £400,000 defence costs (in this case the per-claim limit is reached and the firm covers any excess loss itself). Claim three is settled for £1,500,000 inclusive of £200,000 defence costs. Claim four is being defended and reserves stand at £900,000 inclusive of £200,000 defence costs.

The aggregate consumption stands at £5,300,000 before claim four is paid. Only £700,000 of aggregate remains. If claim four ultimately costs £900,000, the firm will need to fund the £200,000 shortfall from its own resources or from any excess layer cover that has been purchased.

If aggregation had grouped the four claims into a single claim, the aggregate would have been touched only once but the £2,000,000 per-claim limit would have applied to the combined exposure, again leaving a substantial uninsured shortfall.

These figures are illustrative; the actual position depends on the wording and the facts.

See also §

• /wiki/per-claim-limit/ — the per-claim ceiling
• /wiki/each-and-every-loss/ — closely related concept
• /wiki/aggregation-clause/ — the mechanism that decides how many claims there are
• /wiki/excess-insurance/ — interaction with aggregate
• /wiki/deductible/ — variant terminology
• /wiki/professional-indemnity-insurance/ — the line of business
• /wiki/business-interruption-insurance/ — example of aggregate-driven cover

References §

1. ↑ FCA Handbook, MIPRU 3.2 — https://www.handbook.fca.org.uk/handbook/MIPRU/3/
2. ↑ SRA Minimum Terms and Conditions of Professional Indemnity Insurance — https://www.sra.org.uk/solicitors/standards-regulations/indemnity-insurance-rules/
3. ↑ AIG Europe Ltd v Woodman [2017] UKSC 18 — https://www.supremecourt.uk/cases/uksc-2016-0033.html
4. ↑ Lloyds TSB General Insurance Holdings Ltd v Lloyds Bank Group Insurance Co Ltd [2003] UKHL 48 — https://publications.parliament.uk/pa/ld200203/ldjudgmt/jd031106/lloyds-1.htm
5. ↑ Axa Reinsurance (UK) plc v Field [1996] 1 WLR 1026 (HL)
6. ↑ Insurance Act 2015 — https://www.legislation.gov.uk/ukpga/2015/4