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Contingent Business Interruption Calculator

Contingent BI covers losses from damage at a dependent business. This calculator sizes the loss.

Dependent monthly revenue

Dependency loss months

Mitigation offset %

Monthly fixed costs

Contingent BI loss

$733,750

Revenue loss (net)

$543,750

Fixed cost loss

$190,000

How the math works

Loss = revenue × months × (1 − mitigation) + fixed costs × months.

List dependent properties explicitly on the policy. Blanket CBI endorsements often sub-limit at $100-250k — plenty for a dependent supplier, not enough for a retail anchor that drives 40-60% of property traffic.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Contingent Business Interruption Calculator is built to give a quick, browser-based estimate for contingent business interruption. Contingent BI covers losses from damage at a dependent business. This calculator sizes the loss. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the contingent business interruption result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this contingent business interruption estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter monthly revenue dependent on the affected party.
Enter months of dependency loss.
Enter mitigation offset %.
Enter fixed costs continuing during loss.
Read contingent BI loss.

Frequently Asked Questions

What triggers contingent BI?

Damage to a 'dependent property' — supplier, customer, attraction (anchor tenant), or utility. Must be listed on the policy or covered via blanket endorsement. Requires same perils trigger as direct BI.

Dependent property types?

Contributing (supplier), recipient (customer/distributor), manufacturing (co-dependent plant), leader (anchor tenant drawing traffic). Each with separate sub-limits — sum them during underwriting, not after loss.

Mitigation requirement?

Insured must pursue reasonable mitigation (alternate suppliers, relocate sales, reduce variable costs). Failure to mitigate cuts recovery. Document every vendor alternative pursued and its economics.

How often should I rerun this?

Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.