Dependent Business Interruption
Also known as: Contingent Business Interruption, Dependent Property Coverage, Contingent Business Income
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.
Real-world scenario
Brightline Coffee Roasters, a wholesale roaster in Portland, Oregon, sells roasted beans to 40 regional cafes but sources 70% of its green (raw) coffee from a single importer's climate-controlled warehouse in Oakland. When that warehouse suffered a sprinkler malfunction and flooded, the importer shut down for 11 weeks — and Brightline, though physically undamaged, could not fulfill orders. Brightline had added a Dependent Business Interruption endorsement to its commercial property policy with a $500,000 sublimit, a 72-hour waiting period, and a $2,500 deductible, for an added annual premium of $3,800 on top of its $14,200 package premium.
During the shutdown Brightline's monthly revenue fell from $210,000 to $46,000. Its adjuster calculated lost business income of $318,000 over the interruption after subtracting $74,000 in payroll and continuing expenses that were saved. Brightline also spent $41,000 on extra expense — buying pricier spot-market beans from a backup importer at a $1.85-per-pound premium and paying $9,200 in expedited freight — to keep its three largest cafe accounts.
The insurer applied the 72-hour waiting period (roughly $18,000 of the first three days' loss uncovered), subtracted the $2,500 deductible, and paid $338,500 against the $500,000 sublimit. Without the endorsement, Brightline's standard business income coverage would have paid $0, because the physical damage happened at a supplier's location, not its own.
How it affects your premium
Dependent Business Interruption (also called contingent business interruption) is priced on how concentrated and how critical your supplier or customer relationships are. Underwriters weigh these factors:
- Supplier/customer concentration — reliance on one or two "dependent properties" for most revenue drives premium up sharply; a diversified supply chain lowers it.
- Sublimit selected — because this is usually a sublimit within your property form, higher limits ($250K vs $1M) raise cost proportionally.
- Waiting period length — a longer time deductible (72 hours vs 24 hours) reduces frequency of small claims and lowers premium.
- Named vs. blanket dependent properties — specifically scheduling key suppliers costs less than blanket "all suppliers" wording, which is broader and pricier.
- Covered causes of loss — extending coverage to include utility outages, civil authority, or non-physical triggers (like cyber events) increases rate.
- Industry and geography of your dependents — suppliers in flood, wildfire, or earthquake zones increase the exposure and the premium.
- Coinsurance and BI worksheet accuracy — an under-reported business income value can trigger a coinsurance penalty and affect how the account is rated.
Common misconceptions
Myth: My regular business income coverage will pay if a key supplier shuts down.
Reality: Standard business interruption insurance only responds to direct physical damage at your premises. Loss caused by damage at a supplier's or customer's location requires a separate Dependent Business Interruption extension.
Myth: It covers me whenever a supplier fails to deliver, including bankruptcy or a labor strike.
Reality: Coverage is triggered only by a covered physical peril (like fire or flood) at the dependent property — not by financial failure, contract disputes, or strikes, unless a specialized endorsement broadens the trigger.
Myth: If I buy it, every supplier I use is automatically covered.
Reality: Many policies only cover the specific 'dependent properties' scheduled on the form; blanket coverage for all suppliers must be requested and is priced higher.
Frequently asked questions
What is the difference between dependent and contingent business interruption?
Does it cover income lost because my customer's business shut down?
Is there a waiting period before it pays?
Does it cover a supplier that shut down because of a cyberattack?
How do I know how much limit to buy?
Sources cited
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