Business Interruption Insurance Explained | Graham Silva

By Dianne Silva Published June 17, 2026 Updated September 6, 2026 8 min read

Your commercial property policy covers the cost of rebuilding after a fire. It does not cover the revenue you lose while the building is being rebuilt. That is what business interruption insurance is for, and most South African businesses have far too little of it.

A fire destroys your warehouse. The commercial property policy pays to rebuild it and replace the stock. Six months later, the building is ready. But during those six months, you could not trade. You still had to pay rent, salaries, loan repayments, and fixed overheads, from a business that was generating no revenue.

That six-month gap is the business interruption exposure. Without a Business Interruption policy in place, every rand of those fixed costs and every rand of lost profit comes out of reserves, credit, or the owner’s pocket.

What business interruption insurance actually pays

A business interruption policy pays for losses arising from an interruption to your trading activities caused by material damage to your property: a fire, storm, flood, or other insured peril that physically prevents you from operating.

Depending on how your policy is structured, BI pays for:

Lost gross profit: The revenue you would have earned during the interruption period, less the variable costs you saved by not trading (e.g., raw materials, cost of sales). Fixed costs like rent, salaries, and loan repayments continue regardless of whether you are trading.
Increased costs of working: Additional expenses incurred to maintain operations during the interruption, such as renting temporary premises, hiring equipment, or using a more expensive supplier while your own facility is out of action.
Wages: Payroll costs for staff who cannot work because the premises are inaccessible, where your policy includes a wages extension.

The material damage trigger

Business interruption cover is not a standalone product. It is triggered by physical damage to insured property. This is a critical point: if your business is interrupted for a reason that does not involve physical damage to your property (a key supplier fails, a pandemic closes the economy, a cyber attack brings down your systems), a standard BI policy will not respond.

For interruption caused by events that do not involve physical damage to your property, there are separate policy extensions and products. But the core BI product requires a material damage trigger.

The two numbers that determine your payout: sum insured and indemnity period

Business interruption underinsurance is widespread in South Africa, and it almost always comes down to one of these two figures being set incorrectly at the time the policy is taken out.

Sum insured: the gross profit figure

BI is typically insured on a gross profit basis. The sum insured must equal the gross profit your business expects to generate over the indemnity period. Gross profit for insurance purposes is your turnover minus your variable costs of production or trading; it is not the same as accounting profit, and it is not the same as your turnover figure.

A rough calculation:

If your annual turnover is R10 million and your variable costs (raw materials, direct labour, cost of goods sold) are R4 million, your gross profit for BI purposes is R6 million.

If your indemnity period is 12 months, your sum insured should be at least R6 million.

If you insure for R3 million (50% of the true gross profit exposure), the insurer applies average. A claim for R3 million is paid at 50%, meaning R1.5 million is paid and you absorb the rest.

The trap is that businesses set the BI sum insured years ago and never update it. Turnover grows. Costs change. The sum insured stays the same. By the time a claim happens, the business is significantly underinsured.

Indemnity period: how long are you actually protected?

The indemnity period is the maximum length of time the policy pays out following a loss. It begins on the date of the damage and runs for however long you have selected, typically 12, 18, or 24 months.

The question to ask is: how long would it realistically take to fully restore operations after a major loss? This includes the time to clear the site, obtain planning approvals, rebuild or refurbish, reinstall equipment, re-stock, and return to previous trading levels. For many businesses, 12 months is too short. A manufacturer with specialist plant and equipment may need 18 to 24 months. A retailer in a leased premises may need 18 months once you factor in fitout and restocking.

The indemnity period mistake: If the rebuilding and recovery takes 18 months but your indemnity period is 12 months, the policy stops paying after 12 months and you absorb the final 6 months of lost trading yourself. Setting the indemnity period too short is as costly as underinsuring the sum insured.

SASRIA cover: civil unrest and riots

Standard commercial property and business interruption policies do not cover losses arising from civil unrest, public disorder, riots, or strikes. In South Africa, this risk is covered by the South African Special Risks Insurance Association (SASRIA), a state-owned insurance company.

SASRIA cover for BI losses arising from civil unrest can be added as an extension to most commercial policies. Given the events of July 2021 (which caused an estimated R50 billion in losses to South African businesses), this extension is something every business in a risk area should consider seriously.

SASRIA cover is modest in cost relative to the risk, and it is the only mechanism for recovering BI losses caused by riot and unrest. Standard BI policies will not pay these claims.

What BI does not cover

Understanding the exclusions prevents surprises at claim time:

Interruption without physical damage to insured property (standard exclusion)
Cyber attacks causing business interruption: requires a specific cyber BI extension or standalone cyber policy
Supplier failure (unless a contingent BI extension is in place)
COVID-19 and pandemic interruption: most SA policies now specifically exclude this
Losses beyond the indemnity period, even if recovery is not complete
Losses attributable to the business’s own negligence or mismanagement

The annual review that most businesses skip

Business interruption is the commercial cover most in need of regular review. Revenue grows, costs change, indemnity period requirements evolve as businesses grow more complex. A BI sum insured that was accurate three years ago is likely to be materially inadequate today.

The right approach is to review the BI sum insured and indemnity period at each annual renewal, using current financial figures rather than last year’s estimates. Your broker should prompt this conversation. If they are not, prompt it yourself.

Frequently asked questions

Does BI cover me if a key supplier cannot deliver?

Not under a standard BI policy. Standard BI requires physical damage to your own insured property. If a supplier’s premises are damaged by fire and they cannot deliver to you, your business is interrupted, but there is no material damage to your property. A contingent business interruption extension, sometimes called denial of access or suppliers extension, can be added to cover this scenario. It must be specifically arranged and the key suppliers may need to be named in the policy.

What is the difference between gross profit and turnover for BI purposes?

For BI insurance purposes, gross profit is turnover minus variable costs: the costs that stop when trading stops, such as raw materials, cost of goods sold, and direct production costs. Fixed costs (rent, salaries, loan repayments) are included in the gross profit figure because they continue even when trading is interrupted and must be covered by the policy. Using your accounting gross profit or turnover figure without adjusting for this definition is one of the most common causes of underinsurance. A broker or accountant familiar with BI calculations can assist.

How long should the indemnity period be?

The indemnity period should be long enough to cover the full recovery time after your worst plausible loss. Work through the scenario: how long to demolish, clear, and rebuild your premises? How long to source and install replacement equipment? How long to restock? How long to recover your customer base to pre-loss trading levels? For most businesses, 18 to 24 months is more realistic than the default 12 months. For businesses with specialist infrastructure or long lead times on equipment, 24 to 36 months may be appropriate.

Does BI cover a cyber attack that takes down my systems?

A standard BI policy requires a material damage trigger: physical damage to insured property. A cyber attack that brings down your systems is not physical damage to property in the traditional sense, and most standard BI policies will not respond to it. Cyber-related business interruption cover is available as part of a standalone cyber insurance policy, which typically includes both first-party costs (your own losses during the interruption) and the cost of restoring systems. If cyber interruption is a real risk for your business, this cover needs to be arranged separately.

Is your BI sum insured actually correct?

Most South African businesses are underinsured on business interruption, often significantly. We review your current BI policy against your actual revenue and fixed cost exposure. Get in touch.

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