A fire guts a factory in Johor. The factory is not yours. It belongs to the supplier that makes the one component your product cannot ship without. For six weeks your production line sits idle, your revenue stops, and your fixed costs keep running. You file a business interruption claim. The insurer declines it. Nothing was damaged at your premises, and the business interruption section in a standard fire policy pays for interruption caused by damage at the premises named in its schedule and nowhere else. The loss is real, the cause is insured somewhere, but the money is flowing to the wrong policy.

This is the gap that catches you if you depend on a small number of suppliers or customers. Ordinary business interruption (BI) cover follows the bricks. When the damage happens at someone else's bricks, you need a different extension: Contingent Business Interruption (CBI), sometimes called a supplier or customer extension. Unless your BI section carries that extension, it does not do this.

The Answer in 60 Seconds

The business interruption section in a standard fire policy pays for interruption caused by damage at the premises named in its schedule and nowhere else. A fire, a flood or a breakdown at your supplier's or your customer's site is not damage at your premises, so that section does not respond, however large your loss.

Contingent Business Interruption (CBI) is the extension that widens the trigger to damage at a supplier's premises, a customer's premises, or both. Read four conditions in yours: whether it covers named suppliers only or unnamed suppliers too; its own sub-limit; its indemnity period, set separately from the main BI one; and whether the event at the third party must be a peril insured at your own premises, as some wordings require.

A CBI extension keyed to physical damage does not respond to a supplier's insolvency, a lost licence or a closed shipping lane. The Strait of Hormuz closure that Singapore's Prime Minister described on 1 May 2026 as "closed for more than two months" is that kind of event (PMO, May Day Rally 2026).

The Sourced Detail

What business interruption cover actually responds to

Read the business interruption section of your property or fire policy first, because that is where the trigger lives. Its trigger, in the wording in front of you, is built from four elements: physical loss or damage, by an insured peril, at the premises named in the schedule, causing an interruption to the business carried on there. Take away any one of those elements and the section does not respond.

That structure exists for a reason. BI is meant to put you back in the financial position you would have been in had the damage at your premises not happened. Your BI section states its measures - loss of gross profit, increased cost of working, and the fixed costs that keep running while the business is down - and an indemnity period that starts at the date of damage and ends when the business recovers or at the maximum indemnity period in the schedule, whichever is first.

For a worked example of how the gross-profit measure is calculated and how the indemnity period behaves, see the companion article on Business Interruption (BI) vs Contingent Business Interruption (CBI): A Worked Example for Singapore SMEs. The mechanics there apply equally to CBI; the only thing that changes is whose premises the triggering damage occurs at.

Why a supplier's loss does not reach your BI policy

Here is the failure point. When the damage happens at a supplier's site or a customer's site, the chain that BI requires is broken at the first link. There is no physical damage at your premises. Your operations were perfectly capable of running. What stopped was the flow of goods into your factory or the flow of orders out of it.

The economic loss is genuine, and it can be larger than a fire at your own premises would have caused. But the standard BI trigger has no hook for it. The damage is somewhere your policy does not look. This is not an insurer being difficult. It is the cover working exactly as written. The premium you paid bought protection against interruption from damage at your premises, and that is what you have.

The fix is an extension that widens the trigger to include damage at named or unnamed third-party locations: a Contingent Business Interruption extension.

What Contingent Business Interruption adds

A CBI extension widens that trigger so that physical damage at a third party's premises, by a peril the extension covers (in some wordings, only the perils insured at your own premises), counts as a trigger for your BI cover. The third party is one of two kinds:

  • A supplier (an inbound dependency): the loss of goods, components, raw materials, utilities or services flowing into your business, headed in most wordings as a "suppliers' premises" extension - check the heading in yours.
  • A customer (an outbound dependency): a buyer that takes a material share of your output, so that damage at the customer's site stops the orders, headed as a "customers' premises" extension where your wording offers it.

Check whether your wording splits suppliers into direct (first-tier, the firms you contract with) and indirect (the suppliers of your suppliers, and the utilities and logistics providers everyone depends on). The breadth matters, because a shock two tiers up the chain reaches you through a firm you never contracted with.

A CBI extension carries its own conditions that the main BI section does not impose; the four to find in yours are:

  • Named versus unnamed suppliers. Where your extension covers only suppliers scheduled by name, a supplier that is not on the list is not covered, even though the extension exists; where it covers unnamed (or "all") suppliers, read the sub-limit that grant carries, because it is set separately from the named one.
  • A separate sub-limit. Find the CBI cap in your schedule - a fixed dollar figure or a percentage of the BI sum insured - because a concentrated dependency can blow straight through it.
  • A shorter indemnity period. Compare the CBI indemnity period in your schedule with the main BI one, because a supplier's rebuild runs on the supplier's timetable, not yours.
  • The damage-equivalence condition. Some wordings require the third-party event to be an insured peril at your own premises, so a supplier hit by a flood is covered only if flood is insured on your policy; others reach a wider range of perils, so check which yours does.

For the specific case where a key supplier fails not through physical damage but through insolvency, the trigger question is different again, and is covered in detail in Key Supplier Insolvency: The Contingent BI Trigger. The short version: where your CBI extension is keyed to physical damage at the supplier, a pure insolvency or financial-failure event falls outside it unless the wording extends to non-damage supplier failure. Where a supplier has filed under the Insolvency, Restructuring and Dissolution Act 2018, the legal status of your contracts with that supplier is governed by that statute and the appointed officeholder's decisions, not by your property policy. (Insolvency, Restructuring and Dissolution Act 2018, Singapore Statutes Online.)

The concentration problem

CBI exposure is a function of how concentrated your supply chain is. An SME that buys a commodity input from twenty interchangeable suppliers has little CBI exposure: lose one, switch to another, absorb a small cost. An SME that depends on a single specialist supplier, a sole licensor, or one anchor customer for a large share of revenue has a sharp exposure, because there is no substitute to switch to and no second source to absorb the shock.

If you are a precision manufacturer, a specialist distributor or a service firm built around one or two anchor relationships, you sit in the second category. If your inputs come through Malaysia, Indonesia, Vietnam or China, your dependency sits at overseas sites you do not own and cannot inspect. You would never run your own factory without fire cover; check whether you are running your entire revenue through a single upstream dependency with none.

The practical test is simple: identify the one supplier and the one customer whose sudden, six-week disappearance would most damage your revenue. If the answer to either is "we would be in serious trouble," you have a CBI exposure, and the only question is whether your policy covers it and to what limit.

What 2026 added to the non-damage list

The live case is a closed shipping lane, and nothing about it is physical damage at a supplier. Singapore's Prime Minister described the Strait of Hormuz on 1 May 2026 as "closed for more than two months" (PMO, May Day Rally 2026); the Minister for Trade and Industry said on 28 March 2026 that the closure had "disrupted shipping routes" (MTI, 28 March 2026); the Acting Minister for Transport told Parliament on 7 May 2026 that "port operations have remained stable thus far" and that "four more berths at Tuas Port are scheduled to commence operations this year" (MOT, 7 May 2026); and EnterpriseSG's Business Adaptation Grant, available since 7 October 2025 with enhanced support from 1 April 2026, "helps enterprises adapt" their operations to tariff measures (EnterpriseSG). A damage-keyed CBI extension does not respond to any of it. The software version of the same shape is a compromised dependency: CSA's advisory of 6 August 2026 on the npm worm (CSA AD-2026-009) and the guide on software supply-chain attacks carry it.

Common Mistakes

  1. Assuming standard BI covers supplier and customer losses. It does not. BI follows physical damage at your own premises. A supplier's fire is invisible to it. It is also a costly misunderstanding, because the whole loss falls outside the policy rather than part of it.

  2. Believing you have CBI because the policy "mentions suppliers." A supplier extension that covers only named, scheduled suppliers is worthless if the supplier that fails is not on the schedule. Read the named-versus-unnamed condition, not just the heading.

  3. Ignoring the CBI sub-limit. The CBI cap in your schedule is not the BI limit; a concentrated dependency can produce a loss many times the sub-limit, leaving most of the loss uninsured even when the claim is accepted.

  4. Forgetting the customer side. The loss of an anchor customer to a fire or flood at their premises is as damaging as a supplier's loss, and it needs the customers' premises extension, which your wording grants separately from the suppliers' one, or not at all.

  5. Confusing physical-damage CBI with non-damage supplier failure. A supplier going insolvent, or losing a licence, is not physical damage, and a damage-keyed CBI extension does not respond to a pure financial or regulatory failure unless specifically extended.

  6. Setting the CBI indemnity period too short. Supplier recovery runs on the supplier's timetable, and a CBI indemnity period that lapses before the supplier rebuilds leaves a tail of uninsured loss.

  7. Treating the supply chain as static. The supplier list moves; a supplier added last quarter, or a new anchor customer, is not on a named-supplier schedule that was set at last renewal.

What This Means for Your Business

In your programme, CBI sits as an extension to the BI section of the property or fire policy, and the work is in mapping your real dependencies to that wording. The shape of the response is the same regardless of insurer.

Map your concentration first. Before looking at any policy, list your suppliers and customers and rank them by how much revenue depends on each. Flag any single relationship that carries a large share of inbound supply or outbound sales. This map is the input to every coverage decision that follows. Without it, you cannot size a sub-limit or decide which suppliers to name.

Check the trigger and the named-supplier condition. Read whether your BI section has a supplier or customer extension at all, and if so, whether it covers named suppliers only or all suppliers. If it is named-only, confirm your critical suppliers are actually on the schedule and that the schedule is current.

Size the sub-limit against the real loss. Estimate the gross-profit loss from a six-to-twelve-week outage at your most concentrated dependency, then compare it to the CBI sub-limit. If the sub-limit is a fraction of the exposure, you know the gap before a loss instead of discovering it during a claim.

Separate the damage cases from the non-damage cases. Physical damage at a supplier (fire, flood, machinery breakdown) is the classic CBI case. Insolvency, licence loss, sanctions, a closed shipping lane or a congested port, or a supplier simply walking away are non-damage failures that a damage-keyed CBI extension does not reach; the Strait of Hormuz closure that Singapore's Prime Minister described on 1 May 2026 as "closed for more than two months" is the live example (PMO, May Day Rally 2026). Decide whether those need a separate non-damage supply-chain or trade-disruption solution, and route that decision through your adviser.

Keep the schedule alive between renewals. A named-supplier extension is only as good as the list behind it. When you onboard a critical supplier or sign an anchor customer, the schedule should move with it, not wait for the next renewal.

Pair cover with operational resilience. Insurance is the backstop, not the plan. A second source for critical inputs, buffer stock for long-lead components, and contractual rights against suppliers all reduce the loss before any policy is called on. CBI pays for the loss you were unable to engineer away, not the one you chose not to.

Questions to Ask Your Adviser

When you sit with a licensed adviser or commercial broker to review your property and BI programme, ask these specifically, and take written answers, because the answers depend on your wording and your schedule at this renewal.

  1. Does my BI section include a Contingent Business Interruption extension for suppliers, for customers, or for both, or is it silent on third-party premises?
  2. Is the supplier extension limited to named suppliers, or does it cover unnamed (all) suppliers, and what is the sub-limit for each?
  3. Are my most concentrated suppliers and customers actually scheduled, and how do I keep that schedule current between renewals?
  4. What is the CBI sub-limit, and how does it compare to my estimated gross-profit loss from a six-to-twelve-week outage at my single most critical dependency?
  5. What is the CBI indemnity period, and is it shorter than my main BI indemnity period?
  6. Does the extension reach indirect suppliers (the suppliers of my suppliers, utilities, logistics), or only first-tier direct suppliers I contract with?
  7. Does the extension require physical damage at the supplier, and what happens if my supplier fails through insolvency, licence loss, or sanctions rather than physical damage?
  8. Must the third-party event be a peril that would have been insured at my own premises, and which of my key suppliers' likely loss scenarios fall outside that condition?

Related Information

Published 31 May 2026. Source verified 12 September 2026.