Business Interruption Insurance: Coverage, Indemnity Periods, and the COVID Lessons

Property damage is rarely the most expensive part of a disaster. The real financial impact of a fire, flood, or significant equipment failure is typically the interruption to business operations — the revenue that cannot be earned while premises are out of action, the fixed costs that continue regardless of trading, the customers lost to competitors during the recovery period. Business interruption (BI) insurance is the cover designed to make a business financially whole during exactly this period.

Yet BI insurance is notoriously complex to design correctly and frequently purchased in inadequate amounts. The COVID-19 pandemic exposed significant gaps in business interruption wordings across the market, resulting in major litigation and Supreme Court-level clarification of what standard policy language means. Understanding how BI insurance works — and where its limits lie — is essential for any business owner serious about risk management.

How Business Interruption Insurance Works

BI insurance compensates a business for the financial losses it suffers as a result of an insured event interrupting its operations. It is almost always sold as an extension to a commercial property policy — it requires the insured property to have suffered damage as the trigger for cover (the "material damage proviso").

The cover operates on the principle of indemnity: the insurer puts the business back into the financial position it would have been in had the loss not occurred. This is measured by reference to the business's trading results in the period before the loss, projected forward through the interruption period.

The key financial measure insured is typically one of:

Gross profit (the standard basis): Under the gross profit definition used in BI insurance, "gross profit" is specifically defined in the policy — it is not the same as accounting gross profit. The BI definition is typically turnover minus variable costs (the direct costs that reduce in line with reduced turnover). Fixed costs (rent, salaries, loan repayments, rates) continue regardless; BI cover on the gross profit basis includes these continuing costs within the indemnity.

Gross revenue (or turnover): Some policies cover the full loss of revenue rather than gross profit. This provides a higher level of indemnity but also requires a higher sum insured, with higher premiums as a consequence.

The distinction matters enormously. A business with £2 million of revenue and variable costs of £500,000 has a "BI gross profit" of £1.5 million — this is the appropriate sum insured on a gross profit basis. Insuring at the accounting gross profit figure (£2 million minus direct costs of goods sold, which in some sectors could be much lower) would represent significant overinsurance or underinsurance depending on the sector.

The Indemnity Period

The indemnity period is the maximum duration for which BI insurance will pay — measured from the date of the insured event. Common options are 12, 24, or 36 months.

Selecting the correct indemnity period requires honest assessment of how long it would realistically take to restore full trading capacity following a worst-case loss. For a small retail unit, 12 months might be sufficient. For a manufacturer with bespoke equipment on long lead times, a specialist professional services firm that must rebuild client relationships, or a business operating from listed buildings with complex planning requirements for reinstatement, 24 or even 36 months may be necessary.

The single most common and costly error in BI insurance is selecting too short an indemnity period. If a major fire takes 18 months to remediate and the policy has a 12-month indemnity period, the business bears the full cost of the final six months of interruption — even though the policy otherwise responds correctly.

When setting the indemnity period, ask: if our primary premises were destroyed tomorrow and we had to rebuild from scratch, how long before we were trading normally? Use the most pessimistic credible answer, not the optimistic one.

The Material Damage Proviso

Standard BI policies include a material damage proviso: cover is only triggered if there has been physical damage to property insured under the associated property policy (or under any other property policy held by the insured). The BI does not stand alone — it is dependent on a property damage trigger.

This proviso has two practical implications:

1. The sum insured under the property section must be adequate. If the property policy is insufficient to pay the rebuild cost (because of underinsurance), the BI policy's ability to respond may also be affected, since the material damage proviso may be unmet.

2. BI losses arising from causes that do not involve physical property damage are not covered by a standard BI policy — this is the gap that became dramatically apparent during COVID-19.

Non-Damage Business Interruption Extensions

Recognising that many significant business interruptions do not involve physical property damage, the market offers a range of non-damage BI extensions:

Prevention of access: Covers BI losses when the premises are inaccessible due to an event at a nearby location (a police cordon around a bomb threat, evacuation due to a fire at a neighbouring building, flooding of access roads) — even though the insured property itself is undamaged.

Utilities failure: Covers BI losses due to failure of electricity, gas, water, or telecommunications supply from the public grid — provided the failure originated outside the insured premises.

Denial of access by civil authority: Covers government or civil authority action preventing or restricting access to the premises.

Supplier and customer contingency: Covers BI losses arising from damage at a key supplier's or customer's premises that prevents them from supplying the insured or purchasing from it.

These extensions are not automatically included in standard policies. Each must be specifically added by endorsement, and each carries its own trigger wording that may be narrower than it appears. The prevention of access extension, for example, typically requires that access be physically blocked — an advisory warning or voluntary closure does not trigger cover under most wordings.

COVID-19 and the FCA Test Case

The COVID-19 pandemic created an unprecedented BI crisis. Businesses across hospitality, retail, leisure, and many other sectors were forced to close or severely curtail operations by government mandates. Many held BI policies that they believed would respond — only to find that insurers disputed coverage.

The Financial Conduct Authority (FCA) brought a test case in 2020 seeking High Court clarification on disputed policy wordings. Following a High Court judgment in September 2020 and a "leapfrog" appeal, the Supreme Court handed down its judgment on 15 January 2021, ruling on the scope of several disputed non-damage BI wordings. Key findings:

• Certain "disease clauses" (covering BI losses due to notifiable disease occurring within a defined radius of the premises) did respond to COVID-19 losses, though the basis of indemnity was complex given that COVID was a national rather than localised event.
• "Prevention of access" clauses that required physical prevention (rather than mere hindrance) of access typically did not respond to COVID-19 lockdown restrictions, which prevented certain uses of premises but not physical access per se.
• Policies with "hybrid clauses" (disease and prevention of access combined) were more likely to respond.

The case did not resolve all disputed claims — many businesses still faced arguments about quantum and indemnity calculation even where the trigger was established. However, it established that broad non-damage BI clauses can respond to pandemic-related losses where the policy wording is appropriately drafted.

The post-COVID market position: Following the pandemic, insurers either removed or significantly restricted disease and non-damage BI extensions, or introduced pandemic exclusions as standard. Buyers should review current wordings carefully to understand what non-damage extensions remain available and what exclusions have been added. The market availability of broad non-damage BI coverage has contracted substantially.

Additional Covers Within BI Policies

Payroll cover: The insured's wages bill is typically included within the gross profit sum insured. However, some businesses elect to cover payroll separately or at a higher rate to ensure key staff are retained during a recovery period even if trading has not resumed.

Accountants' clause: BI policies typically include an accountants' clause allowing the use of the insured's own accountants to prepare the claim, with reasonable professional fees met by the insurer. This is valuable for complex claims where detailed financial analysis is required.

Increased cost of working: Where the insured can reduce the BI loss by spending money (renting alternative premises, working overtime, accelerating production elsewhere), the insurer covers these increased costs up to the lesser of the actual cost incurred or the BI loss avoided. This encourages the insured to mitigate losses efficiently.

Under-Insurance Risk

Under-insurance in BI — setting too low a sum insured for gross profit — is extremely common and extremely costly. Many BI policies include an "average clause" (also called condition of average): if the sum insured is less than the actual gross profit, claims payments are reduced proportionally.

On a policy with a 12-month indemnity period and an actual gross profit of £1.5 million, if the sum insured is only £900,000, a claim that would otherwise pay £400,000 would be reduced to £240,000 (60%). The insured bears 40% of the loss themselves.

Regular review of the sum insured — ideally every two to three years, and certainly following material changes in turnover or cost structure — is essential. The sum insured should reflect the business's projected gross profit for the indemnity period, not its historic figure.

Important: BI policy wordings vary significantly between insurers and have changed materially following COVID-19. The description of cover in this guide is general in nature; specific policy terms and exclusions must be reviewed carefully. Professional advice should be sought when establishing or reviewing BI cover.

How Global Investments Can Help

Global Investments assists business owners in designing BI insurance programmes that correctly reflect the business's financial structure, indemnity period requirements, and non-damage exposure. We review existing programmes for under-insurance risk, inadequate indemnity periods, and gaps in non-damage extensions — and we benchmark terms across the commercial market to ensure competitive pricing.

For businesses with complex structures — multiple locations, international operations, supply chain dependencies — we advise on how to design BI cover that addresses the full range of interruption risks rather than just property damage.

Contact our commercial insurance team to discuss your business interruption requirements.