---
title: "How Is Business Interruption Insurance Calculated?"
description: "Keep financial statements, payroll, sales, and expense records so you can support the calculation."
canonical: "https://spot.insure/insurance-faq/business-interruption/how-is-business-interruption-insurance-calculated"
page-type: "faq-question"
updated-at: "2026-09-25"
---

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# How Is Business Interruption Insurance Calculated?

Keep financial statements, payroll, sales, and expense records so you can support the calculation.

Insurers generally calculate business-interruption losses by comparing expected income with actual results during the restoration period, then accounting for continuing expenses and costs you avoided. Your policy’s income definition, limits, and waiting period govern the payment. The policy defines the covered income measure and may address payroll, extra expense, seasonality, and partial operations. Payment is limited by the covered trigger, period, waiting period, and available limit.

Read the form’s business-income definition and records clause before a loss. Maintain financial statements, sales histories, budgets, payroll, invoices, and expense records. Ask whether the limit is actual-loss-sustained or capped, and how the policy handles trends, resumed operations, and extra expenses.

## Related Questions

- [What Is Business Interruption Insurance?](https://spot.insure/insurance-faq/business-interruption/what-is-business-interruption-insurance)
- [What Doesn’t Business Interruption Cover?](https://spot.insure/insurance-faq/business-interruption/what-business-interruption-does-not-cover)
- [Does Business Interruption Cover Lost Revenue?](https://spot.insure/insurance-faq/business-interruption/does-business-interruption-cover-lost-revenue)
- [How Much Business Interruption Coverage Do I Need?](https://spot.insure/insurance-faq/business-interruption/how-much-business-interruption-coverage-do-i-need)

## Related Coverage

- [Commercial property](https://spot.insure/coverage/commercial-property)

## Sources

1. [Business Interruption and Business Owner Policy](https://content.naic.org/insurance-topics/business-interruption-and-business-owner-policy). National Association of Insurance Commissioners; Background; Commercial property; Business interruption; Contingent business interruption. Accessed 2026-09-25.
2. [FAQ on business interruption insurance and other issues affecting California small businesses](https://www.insurance.ca.gov/01-consumers/140-catastrophes/FAQ-on-Business-Interruption-Insurance.cfm). California Department of Insurance; Business interruption trigger; COVID-19 income loss; policy exclusions; civil authority. Accessed 2026-09-25.
3. [What Business Income Loss Coverages Are Out There? Learn the Endorsements That Can Help with Lost Business Income](https://content.naic.org/article/small-business-insight-what-business-income-loss-coverages-are-out-there-learn-endorsements-can-help-lost-business-income). National Association of Insurance Commissioners; Top Considerations; Things You Should Know: business income, extra expense, service interruption, contingent business interruption, civil authority. Accessed 2026-09-25.
4. [Commercial Property and Business Income Coverage Forms in SES sample policy](https://www.ses-ins.com/media/gemhgbdl/ses_sample-policy_ces_042025-3.pdf). Insurance Services Office, Inc.; sample hosted by SES Insurance; CP 00 10 10 12, printed pp.1–16 / PDF pp.7–22: A.1 Covered Property, A.2 Property Not Covered, E.1.b Property of Others, E.1.e Outdoor Property; CP 00 30 10 12, printed pp.1–9 / PDF pp.22–30: Business Income definition, trigger, coinsurance and restoration period. Accessed 2026-09-25.

More answers: [Business Interruption Insurance FAQ](https://spot.insure/insurance-faq/business-interruption).

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