The Answer in 60 Seconds

A Singapore commercial insurance policy's headline sum insured is only the first of four limit structures that determine the actual payout at claim. The four structures - sum insured, sub-limit, aggregate, and deductible - operate together: the deductible is the SME's first-dollar contribution per loss; the sub-limit caps the cover for specific loss types within the broader cover; the sum insured is the maximum payout per loss or per item; the aggregate is the maximum total payout across the policy period regardless of how many claims occur. A policy with a S$10 million sum insured may pay only S$500,000 on a specific loss if a sub-limit applies, less the deductible, and may stop paying entirely once the aggregate is exhausted. This article sets out how each structure operates, where each appears most often in standard Singapore wordings, and the renewal-time questions that determine whether the structure matches the SME's exposure.

The Sourced Detail

The headline sum insured is the figure that draws the attention at quote stage. The four-limit interaction is the figure that determines the payout at claim. The SME that understands the difference is the SME that selects cover for value rather than for headline price - see why buying corporate insurance on price alone costs more in the long run.

The four structures

1. Sum insured. The maximum the policy will pay for a covered loss, subject to any further limits. For property cover, the sum insured is typically the value of the property (reinstatement basis, replacement basis, or indemnity basis); for liability cover, the sum insured is the maximum third-party damages the policy will pay per claim.

2. Sub-limit. A cap within the broader cover for specific loss types. Common sub-limits:

  • Money cover - the sub-limit for cash on premises, cash in transit, cash in safe.
  • Documents and records - a sub-limit for reinstatement of business records.
  • Theft of stock - sometimes capped within a fire-and-perils cover.
  • Specific peril sub-limits in property cover (water damage, accidental damage to specific assets).
  • Crisis management sub-limit in cyber and crime covers.

A sub-limit operates as the maximum for that specific loss type within the broader cover. If the sum insured is S$5 million but the money sub-limit is S$50,000, a money loss is capped at S$50,000 regardless of the broader sum insured.

3. Aggregate. The maximum the policy will pay across the policy period, across all claims. Aggregates apply commonly to:

  • Professional indemnity (PI) - typically aggregated.
  • Directors' and officers' liability (D&O) - typically aggregated.
  • Cyber liability - typically aggregated.
  • Employment practices liability (EPL) - typically aggregated.
  • Crime / fidelity guarantee - typically aggregated.

Once the aggregate is exhausted, the policy pays no further claims in the period, even if individual per-claim limits have not been reached.

4. Deductible. The SME's first-dollar contribution per loss before the insurer pays. Two structures matter:

  • Each-and-every claim deductible. The deductible applies per claim. Multiple claims in the year each carry the deductible.
  • Aggregate deductible. The total deductible across all claims in the year is capped; once the aggregate deductible is met, subsequent claims are paid in full.

Deductibles serve two purposes: reduce the premium (the SME self-insures the small layer) and align the SME's risk-management incentive with the insurer's.

How the structures interact at a claim

For a single claim, the payout calculation runs:

Insurer pays = (Loss amount, capped at applicable sub-limit, capped at sum insured) minus deductible

For multiple claims in the policy period, the aggregate caps the running total of insurer payments.

A worked example. An SME holds a cyber policy with:

  • Sum insured: S$2 million per claim.
  • Aggregate: S$4 million for the policy period.
  • Sub-limit on cyber-extortion: S$500,000.
  • Sub-limit on regulatory fines (where insurable): S$250,000.
  • Deductible: S$50,000 each and every claim.

A ransomware incident triggers an extortion payment of S$300,000, forensic costs of S$200,000, individual notification costs of S$100,000, and third-party liability claims of S$1,500,000. The payout:

  • Extortion: S$300,000 (within sub-limit) less S$50,000 deductible = S$250,000.
  • Forensics: S$200,000 (no sub-limit) less S$50,000 deductible (per-claim, deductible already applied) = S$200,000 if treated as same claim; S$150,000 if treated as separate claim with own deductible.
  • Notification: same analysis.
  • Third-party claims: S$1,500,000. If all four items are treated as one claim, their total of S$2,100,000 is more than the S$2 million per-claim sum insured, so the insurer's payment for that claim cannot exceed S$2 million.

Total insurer payout depends on the "one claim" definition in the wording. If treated as one claim, the deductible applies once (S$50,000); if treated as multiple claims, the deductible applies multiple times.

The running aggregate is reduced by the insurer's payments.

Where sub-limits hide cover gaps

Three patterns where sub-limits create unexpected cover gaps.

Documents and records. The sub-limit for reinstatement of damaged business records can be small in property wordings. A fire that destroys the SME's filing room may face a reinstatement cost in the hundreds of thousands.

Specific perils within "all risks" property. An "all risks" wording may carry sub-limits on specific perils (theft, water damage, accidental breakage) that meaningfully restrict the cover.

Defence costs. Liability wordings treat defence costs differently: some pay them in addition to the limit of liability, and others count them in the loss that erodes the limit. Where defence costs erode the limit, a serious claim can use up cover before it is resolved.

Where aggregates hide cover gaps

Three patterns where aggregates create unexpected cover gaps.

Multiple PI claims in one year. A PI policy with a S$2 million per-claim limit and a S$2 million aggregate effectively only covers one full-limit claim per year. A second claim in the same year reduces the available cover.

Cyber aggregates. The aggregate may be the binding constraint, not the per-event limit.

Crime / fidelity aggregates. Multiple discovery events in one year (different schemes by different employees) may aggregate against the policy's annual limit.

Where deductibles compound

Three patterns where deductibles compound to a larger-than-expected SME cost.

Each-and-every claim in a high-frequency line. A motor fleet policy with an each-and-every deductible can produce significant SME contribution across the year if multiple incidents occur.

Per-location deductibles in multi-location property cover. A loss at one location does not erode the deductible at another.

Time-deductibles in BI cover. The "waiting period" before BI cover begins is effectively a time-deductible. A 72-hour waiting period excludes the first three days of revenue impact.

The renewal-time questions

Five questions to put to the licensed adviser at every renewal:

  1. What are all the sub-limits in our policy, and where do they bind against our exposure?
  2. What is the aggregate, and how does it compare to our claims experience and to our exposure?
  3. What deductibles do we carry, and what is the structure (each-and-every, aggregate, time-deductible)?
  4. Are there sub-limits we could increase by endorsement, at what cost?
  5. What is the "one claim" definition, and how does it operate across linked incidents?

How the structures interact with subrogation

Where the insurer pays a claim, the insurer may then exercise subrogation rights against a responsible third party - see subrogation: when your insurer recovers from a third party. Under the English Napier principles, unless the policy provides otherwise, a recovery goes first to the SME's uninsured loss other than the deductible, then to the insurer up to what it paid, and last towards the deductible.

The policy wording can vary that order, including where the deductible falls in it.

Common Mistakes / What Goes Wrong

  1. Reading the sum insured without reading the sub-limits. The binding constraint may not be the headline limit.

  2. Assuming the aggregate is not relevant. Multiple claims in a year may compound to exhaustion.

  3. Each-and-every deductible across a high-frequency line without an aggregate cap.

  4. Defence costs treatment missed at the liability-policy review.

  5. Money sub-limit set at default without checking actual cash exposure.

  6. "All risks" property cover treated as boundless. The sub-limits within bind.

  7. No "one claim" analysis on linked events.

  8. BI waiting period (time-deductible) ignored. Three days of revenue is material.

  9. Aggregate-deductible structure not considered as an alternative to each-and-every.

  10. No documentation of the limit structure rationale for future renewal reference.

What This Means for Your Business

  1. Map all four limit structures in every policy.

  2. Identify the binding constraint per cover - is it the sum insured, the sub-limit, the aggregate, or the deductible?

  3. Calibrate sub-limits to actual exposure, not to default values.

  4. Choose deductible structure (each-and-every vs aggregate) based on the line's frequency profile.

  5. Document the renewal decision rationale for each limit.

  6. Connect the limit structure to the 60-minute audit findings.

  7. Review the "one claim" definition in claims-made covers.

  8. Update the limit structure when the exposure changes materially.

Questions to Ask Your Adviser

  1. For each of our covers, what are the sum insured, sub-limits, aggregate, and deductible structures?
  2. Where do you see the binding constraint - the limit most likely to bind at a serious claim?
  3. For our deductibles, would an aggregate-deductible structure produce a better total-cost-of-risk than the each-and-every structure?
  4. For our sub-limits, which would you flag as inadequate against our specific exposure?
  5. For our aggregates, what is the relationship to our typical claims frequency and severity?

Related Information

Published 22 May 2026. Source verified 22 May 2026.