Business Interruption Insurance: Five Lessons on What Triggers a Valid Claim
Business interruption insurance is one of the most misunderstood commercial covers — and one of the most disputed at claim time. This article examines the five factors that most commonly determine whether a BI claim succeeds.
Five factors that determine whether a BI claim succeeds
1
Material damage trigger
Standard BI policies require physical damage to the insured premises as a precondition for a revenue loss claim. Revenue lost without physical damage — from a power failure, an evacuation order, or a pandemic — is typically not covered unless the policy has specific extensions. This is the single most common reason BI claims fail. Check whether your policy has a material damage requirement and what extensions are in place.
2
The indemnity period
Cover only runs for the indemnity period stated in the policy — typically 12, 24, or 36 months. If the business takes longer than that period to recover, losses after the period ends are not covered. Many businesses that choose a 12-month period find this insufficient after major structural damage. Review this at every renewal.
3
Sum insured adequacy
The BI sum insured should represent the gross profit (as defined in the policy) for the full indemnity period. If the sum insured is too low — because the business has grown since last renewal — a claim will be subject to averaging, reducing the payout proportionately. Reviewing the sum insured annually against actual trading figures is essential.
4
Mitigation
Policyholders have a duty to mitigate losses — to take reasonable steps to reduce the interruption period and limit financial loss. An insurer may reduce a BI payout if the business failed to take obvious mitigation steps (relocating to temporary premises, fulfilling orders from another site, maintaining key customer relationships). Document mitigation efforts throughout the interruption period.
5
Policy wording specificity
BI policies vary significantly in their definitions and extensions. "Denial of access," "loss of attraction," "suppliers' extension," and "notifiable disease" clauses all expand what triggers cover — and the absence of each limits it. Two businesses in the same sector with similar losses may get very different outcomes based solely on their policy wording. Read the policy, not just the summary, before a claim arises.
Preparing your business before a claim
The businesses that navigate BI claims most successfully are those that prepared before the loss occurred: they have up-to-date accounts that accurately reflect revenue, they understand their policy wording, they have current supplier and customer contact details, and they have a recovery plan. For detail on what the cover includes, see our business interruption insurance guide. For the liability side of business insurance, see business liability explained.
Business interruption FAQ
Frequently asked questions
- It depends on the policy wording and the source of the outage. Some BI policies include "denial of access" or "utilities failure" extensions that cover losses from external infrastructure failures — power, gas, water. Others require that the interruption was caused by physical damage at the insured premises. A standard BI policy without an extension is likely to decline a revenue loss claim from a grid power failure with no physical damage. Check whether your policy includes utilities failure cover explicitly. See our business interruption insurance guide.
- Gross profit under BI policies is typically defined in the policy itself — not in the accounting sense. It usually means turnover minus variable direct costs (materials, packaging, variable labour). The insurer will compare actual gross profit during the interruption period with the projected gross profit based on recent trading history, adjusted for trends and seasonality. Businesses with highly seasonal revenue need to ensure the indemnity period and projection methodology reflect peak periods. Keeping accurate, up-to-date management accounts makes the claim calculation much smoother.
- The indemnity period is the maximum time over which BI losses are paid. It starts when the interruption begins and ends either when the business is restored to normal trading OR when the indemnity period expires — whichever comes first. Most businesses choose 12 months; complex premises (manufacturers, specialist facilities) often need 24 or 36 months to allow for full rebuild and recommissioning. Choosing too short an indemnity period is a common and expensive mistake — especially for premises that take longer to rebuild than expected.
- Yes, but the payout reflects actual pre-loss trading performance. A business that was already loss-making before the interruption will not receive a BI payout that treats the interruption as the cause of that loss. The insurance principle is to return the business to the position it would have been in without the interruption — if it was already struggling, the baseline is low. New businesses may face particular difficulty demonstrating projected revenues. Some policies have specific provisions for newer businesses.