Business Interruption Insurance Explained

Protecting income when trading is disrupted by insured events.

Business interruption (BI) insurance is designed to protect your income if your business can’t operate normally after an insured event — such as a fire, flood, or major equipment failure — depending on the policy.

BI is often linked to property insurance and can be crucial for businesses that rely on premises, equipment, or a steady flow of customers. This guide explains how BI works and what to check.

What business interruption insurance covers

BI is about maintaining business continuity financially. It can cover lost gross profit, ongoing fixed costs, and extra costs to keep operating, depending on policy structure. Most BI is packaged with property insurance and is triggered by physical damage to insured property caused by an insured peril.

• Loss of gross profit (or revenue basis) due to interruption after insured damage.
• Ongoing fixed costs (rent, wages) within the BI calculation basis.
• Additional increased cost of working (AICOW) to reduce the interruption impact.
• Access restrictions or supplier/customer extensions (policy-dependent).

Triggers: why BI often requires ‘damage’

A common misunderstanding is that BI covers any downturn. Usually, it only responds when there is an insured event that triggers the cover — often physical damage to property. Some policies offer extensions (for example denial of access, public authority, utilities failure), but these have strict definitions and limits.

• Standard trigger: insured damage at insured premises.
• Denial of access: restrictions preventing access after nearby damage (limited cover).
• Supplier/customer extensions: if a key supplier suffers insured damage (policy-dependent).
• Utilities failure: interruption due to power/water failure (often limited).

Indemnity period: choosing the right length

The indemnity period is the maximum time the insurer will cover losses while you recover. Choosing too short a period is a common and costly mistake. Think beyond ‘reopening’. Recovery can include rebuilding, replacing equipment, regaining customers, and restoring normal revenue levels.

• Common periods: 12, 18, 24, 36 months depending on business complexity.
• Consider supply chains and specialist equipment lead times.
• Consider regulatory approvals or fit-out times for premises.

Sums insured and BI calculations

BI sums insured should reflect your forecast gross profit (or revenue) over the indemnity period, adjusted for trends. Underinsurance can reduce claims payouts. Work with your accountant or broker to set a realistic figure, especially if your business is growing.

• Choose the correct basis (gross profit vs revenue).
• Update sums insured annually as turnover and costs change.
• Understand ‘average’ clauses: underinsurance can proportionally reduce claims.

Practical steps to improve BI outcomes

BI claims require good financial records. Maintain management accounts, VAT returns, payroll records, and detailed notes of interruption impacts. Also build an operational continuity plan. The faster you can trade again, the smaller the loss and the smoother the claim.

• Maintain clean financial records and backup copies securely.
• Document interruption impacts daily during an incident.
• Plan alternative premises or trading routes where feasible.
• Understand your policy’s notification and cooperation requirements.

Key takeaways

• BI protects income after an insured interruption, usually triggered by insured damage.
• Check triggers and extensions carefully — not all disruptions are covered.
• Indemnity period is critical; choose a realistic recovery timeframe.
• Set sums insured accurately; underinsurance is a major risk.
• Good records and a continuity plan improve claim outcomes.