Dependent Business Interruption

Dependent business interruption — also called contingent business interruption — extends a company's business income coverage to losses caused by physical damage at someone else's property. If a direct-damage peril (fire, storm, etc.) strikes a key supplier, a major customer, a "leader" business that draws foot traffic, or a shared logistics facility, and that damage forces the insured to slow or stop, this coverage replaces the resulting lost earnings. The insured's own building is never touched — the interruption flows downstream from a dependency in its supply or revenue chain.

For a small-business buyer, this matters because modern operations are tightly linked to a handful of critical vendors and clients, and a single supplier's fire can idle a business that is otherwise fully operational. A manufacturer that buys a specialty component from one plant, or a retailer whose sales depend on an anchor store next door, can lose weeks of income through no fault or damage of its own. Standard business interruption coverage only responds to damage at the insured's own premises, so this dependent-property extension fills a gap most owners do not realize exists until it is too late. It is typically added by endorsement to a commercial property or business owners policy.

A practical nuance: coverage usually requires that the loss stem from a peril that would have been covered had it occurred at the insured's own location, and dependent properties must generally be scheduled or defined — named suppliers/customers, or broad "unnamed" language, each priced differently. Buyers should confirm whether coverage extends to "secondary" dependencies (a supplier's supplier), review the coinsurance and waiting-period terms, and pair it with extra expense coverage to fund the cost of sourcing alternatives while the dependent property recovers.