The mental model

Property insurance pays for damage to things. Business interruption insurance pays for the loss of income that those things were generating. The two are almost always linked: a covered physical loss triggers BI coverage; BI without a triggering physical loss is the exception, not the rule. But the income loss is measured separately from the property loss, settled separately, and frequently disputed separately. A clean property settlement can hide a contentious BI dispute that takes a year longer to close.

The buyer's mental model should be: the property limit pays to rebuild the building; the BI limit pays the bills and the lost profits while the building is being rebuilt. The carrier's mental model is similar but more constrained — the BI policy pays for income that would have been earned had the loss not occurred, measured against documented historical performance, for a defined period of restoration, subject to a waiting period and any sublimits. The two mental models converge on routine claims and diverge sharply on complex ones, which is where the disputes live.

Standard BI coverage

The standard commercial property form covers business income loss and extra expense resulting from a covered cause of loss. The coverage applies to actual loss of business income sustained due to the necessary suspension of operations during the period of restoration.

The three coverage components

• Net income. The profit (or loss) that would have been earned during the period of restoration absent the loss. For a profitable business, this is the foregone profit. For a marginally profitable business, this may be small or zero.
• Continuing expenses. Operating expenses that continue during the suspension regardless of revenue — rent, salaries of retained employees, debt service, utilities maintained for security or preservation. These are reimbursed because they would have been covered by revenue had revenue not been interrupted.
• Extra expense. Additional costs incurred to continue operating during the suspension or to minimize the period of restoration — temporary location rent, expedited equipment shipping, overtime to expedite repairs. Reimbursed because they reduce the BI loss the carrier would otherwise pay.

What is NOT covered

• Losses without a covered cause. If the underlying physical damage is not covered (e.g., flood damage on a policy without flood endorsement), BI does not respond either.
• Pre-existing decline. If revenue was declining before the loss, BI typically projects forward the declining trend, not the historical peak.
• Permanent loss of business. BI pays during the period of restoration, not for the post-restoration recovery period. If a business never returns to pre-loss revenue, BI does not pay for the gap.
• Loss of market. If the cause of revenue loss is market conditions rather than the physical event (a tenant leaves because of changing demand, not because of building damage), BI does not respond.

Period of restoration

The period of restoration is the window during which BI coverage applies. It begins when the physical loss occurs and ends when the property could be — with reasonable speed and similar quality — restored to operating condition. The definition is operational, not financial: it ends when the building could be reopened, not when the business has recovered its pre-loss revenue.

How the period is defined

• Start. The date of the direct physical loss (typically subject to a waiting period — see below).
• End. The earlier of (a) the date the property is or should be restored, or (b) the date that operations are restored to a similar location.
• "Should be" matters. The carrier's obligation runs through when restoration should have been completed, not when it actually was. An insured who delays repairs is not entitled to extended BI for the additional days.

The waiting period

Most BI coverage includes a waiting period (typically 24, 48, or 72 hours) at the start of the period of restoration. The waiting period functions like a time-based deductible: the first N hours of BI loss are not covered. Reasonable for transient interruptions; potentially significant for short-duration losses where the waiting period consumes a meaningful fraction of the total loss.

Extended period of indemnity

An optional extension that continues BI coverage for a defined period (30, 60, 90 days, or more) after the property is restored, recognizing that revenue may take time to return to pre-loss levels even after the building reopens. Particularly valuable for hospitality, retail, and other businesses where customer relationships are interrupted by extended closure.

The "similar quality" question

The period of restoration is measured by when the property could be restored "to similar quality" — not better, not worse. Insureds who use the rebuild as an opportunity to upgrade (new equipment, modernized layout, expanded capacity) cannot extend the period of restoration to account for the upgrade time. The clock runs on the simpler restoration, even if the actual rebuild took longer.

Civil authority and ingress-egress

Two extensions cover situations where the insured's property is not damaged, but operations are interrupted because of damage nearby or because access is restricted by governmental order.

Civil authority coverage

Provides BI coverage when access to the insured's property is prohibited by order of civil authority as a direct result of damage to other property (typically within a defined radius — one mile, one block, "in the vicinity"). The classic example: a hurricane damages the neighboring building, the city closes the street to clear debris, and the insured's undamaged store cannot operate. Civil authority coverage responds even though the insured's property itself was not damaged.

Limits and timing

• Sublimit. Often capped at $100K–$500K, regardless of the underlying BI limit.
• Time limit. Typically 2–4 weeks of coverage, not the full period of restoration.
• Trigger requirement. The civil authority order must be a direct result of covered physical damage to other property, not a general government action.

Ingress / egress coverage

Provides BI coverage when access to the property is physically blocked — by debris, by collapsed infrastructure, by mandatory evacuation — even without a formal civil authority order. Often combined with civil authority in a single extension. The trigger requirement is similar: the blocked access must be due to covered physical damage in the vicinity.

Pandemic-era controversy

Civil authority became one of the most litigated coverage provisions in commercial insurance during 2020. Insureds argued that COVID-19 shutdown orders constituted civil authority denying access to their property. Carriers argued (largely successfully) that civil authority requires (a) physical damage to other property as the underlying trigger and (b) physical denial of access, not just an operational closure. The vast majority of courts sided with the carriers. The litigation reshaped how civil authority is read.

Contingent business interruption

Standard BI covers interruption of the insured's own operations. Contingent BI (CBI) covers interruption of the insured's operations caused by damage to someone else's property — typically a supplier, customer, or anchor tenant.

How CBI works

• Trigger. Physical damage at a contingent property (supplier, customer, etc.) that is covered cause of loss under the insured's policy form.
• Effect. The damage to the contingent property causes interruption of the insured's operations — supplier cannot ship critical inputs, anchor tenant closure reduces foot traffic, customer cannot accept the insured's product.
• Recovery. The insured collects under its own policy for its own BI loss, measured the same way as direct BI.

The three CBI categories

• Direct supplier / contributing properties. Properties that supply materials or services to the insured. Damage to a single-source supplier of a critical component can shut down the insured's manufacturing for months.
• Direct customer / recipient properties. Properties that buy from the insured. If the customer cannot receive the insured's product (e.g., a closed retail anchor), the insured's revenue is interrupted.
• Attraction / leader properties. Properties that draw traffic to the insured. The classic example is the anchor tenant in a shopping center — when the anchor is damaged and closed, the smaller tenants suffer foot-traffic loss.

Named vs unnamed CBI

Most CBI coverage requires that contingent properties be named in the policy (with corresponding sublimits per location). Unnamed or blanket CBI is increasingly rare and expensive because the carrier cannot reasonably underwrite exposure to unidentified third-party properties. Buyers with critical supplier dependencies typically schedule those suppliers explicitly.

Extra expense

Extra expense coverage pays for the additional costs the insured incurs to continue operations during the period of restoration. It is structurally part of the BI coverage but settles separately and serves a different purpose.

What extra expense covers

• Temporary location costs. Rent and operating costs at a substitute facility while the damaged property is restored.
• Expedited repairs. Overtime, premium freight, expedited equipment shipping that reduces the period of restoration.
• Temporary equipment. Rental of substitute machinery or vehicles to continue operations.
• Outsourcing. Subcontracting work to third parties to maintain customer commitments.
• Communications and relocation. Costs to inform customers, relocate staff, set up temporary IT.

The economic test

Extra expense is reimbursable only to the extent that it reduces the BI loss the carrier would otherwise have paid. Spending $100K on temporary facilities to save $400K in lost income is covered. Spending $400K on temporary facilities to save $100K is not — the carrier will pay the lower of the two amounts. This "cost-effective" test is often relaxed in practice (carriers approve reasonable extra expense without strict economic analysis) but appears explicitly in policy language.

Extra expense vs expediting expense

Some property forms distinguish "extra expense" (the broader category) from "expediting expense" (specifically the cost to speed up repairs, often a sublimit within property coverage rather than BI). The distinction is form-dependent and rarely litigated on its own, but matters at claim settlement because the two coverages may have different limits, deductibles, and approval processes.

Measurement and the BI worksheet

BI measurement is where the technical work lives. The policy specifies the formula; the BI worksheet is the standard tool to estimate the limit and prove the loss.

The standard BI formula

Business income = Net income (or loss) + Continuing expenses. Some forms add Payroll as a separate component; others fold ordinary payroll into continuing expenses. Extra expense is calculated separately.

Net income measurement

Net income is typically measured as revenue minus variable expenses (the expenses that would have been incurred to generate the revenue). It is not gross revenue, and it is not net profit. The distinction matters: gross revenue overstates the loss; net profit understates it. Net income (revenue minus variable costs) approximates the actual financial impact.

Continuing expenses

Expenses that continue during the suspension and would have been paid by revenue had revenue continued. Standard examples: rent, payroll for retained employees, debt service, insurance, depreciation. Excluded: variable costs that decline with revenue (raw materials for a manufacturer that has stopped production, sales commissions on unrealized sales).

The BI worksheet

The ISO BI worksheet (CP 15 15) is the standard pre-loss tool buyers and brokers use to estimate the BI limit needed. The worksheet starts with the prior 12 months of revenue, identifies continuing expenses, and projects the figure forward for the proposed policy period. Coinsurance penalties apply if the actual BI value at the time of loss exceeds the limit by more than a stated percentage (typically the BI limit must equal at least 80% of expected 12-month business income).

The proof of loss

After a loss, the insured must prove the BI loss through documentation — historical financial statements, sales records, expense ledgers, customer contracts. Most large BI claims are reconstructed by forensic accountants who work for the carrier (or jointly engaged), comparing actual post-loss performance to projected counterfactual performance. The reconstruction is where most BI disputes originate.

COVID-era and pandemic exposures

The COVID-19 pandemic produced the largest BI claim experiment in the history of the line. Tens of thousands of businesses filed claims for shutdown-related losses. Most were denied. The few that succeeded depended on idiosyncratic policy language.

The carrier position

Standard commercial property forms require "direct physical loss of or damage to" property to trigger BI coverage. Carriers argued — and the vast majority of courts agreed — that the presence of a virus in the air or on surfaces does not constitute physical loss or damage in the policy sense. The form requires alteration of the physical property, not merely contamination that can be remediated by cleaning.

The insured position

Insureds argued that government shutdown orders constituted civil authority denying access to property, that the presence of the virus rendered properties unusable (a form of physical loss), and that the standard property exclusions did not anticipate pandemic exposure. A small number of jurisdictions accepted some version of this argument, particularly in cases where the policy lacked a virus exclusion.

The virus exclusion

Following SARS in 2003, ISO promulgated a standard virus exclusion (CP 01 40 07 06) that excludes loss caused by virus, bacterium, or other microorganism. By 2020, the exclusion was on most US commercial property policies. Where the exclusion was present, COVID BI claims were denied with little controversy. Where it was absent, litigation continues.

Communicable disease coverage

A small post-COVID market has emerged for affirmative communicable disease BI coverage — typically narrow, expensive, and sublimited. Penetration remains low. Most carriers continue to exclude communicable disease entirely.

The structural lesson

BI coverage assumes a specific causal chain: physical damage at the insured's premises (or a contingent property) causes operational suspension that produces income loss. The pandemic broke this chain — operational suspension was caused by regulatory and behavioral response, not physical damage. The line is not structured to absorb that kind of correlated, non-physical loss, and the post-COVID consensus is that it should not be.

Where IDP earns its keep

BI claims handling is one of the most document-intensive workflows in property insurance. Loss reconstruction requires reconciling years of historical financial statements, customer contracts, payroll records, and expense ledgers against a counterfactual projection of what would have happened absent the loss.

Indico use cases

• BI worksheet extraction. Pull the structured data from CP 15 15 worksheets — revenue, continuing expenses, payroll splits — into the carrier's record so limit adequacy can be evaluated at quote.
• Financial statement normalization. Convert heterogeneous accounting formats (QuickBooks, NetSuite, custom GL exports) into a consistent revenue and expense schedule for BI projection.
• Contingent property scheduling. Extract scheduled CBI locations from policy declarations and link to the carrier's exposure model for accumulation analysis.
• Civil authority and ingress-egress triage. For event-driven mass claims (hurricanes, wildfires), automate the determination of which scheduled locations fall within the civil authority radius and which were impacted by ingress-egress restrictions.