How do you prove business interruption?
James Craig
Published Feb 25, 2026
The numbers in a well-prepared and documented business interruption claim can be verified back to their sources, such as the general ledger, financial statements, tax returns, vendor statements, customer orders, letters from customers, market forecasts from external sources, and other verifiable sources.
What is needed for a business interruption claim?
Among the necessary documents for a business interruption insurance claim are: Pre-disaster financial statements and income tax returns. Post-disaster business records. Copies of current utility bills, employee wage and benefit statements, and other records showing continuing operating expenses.
How do you prove loss of business income?
These documents must cover the entire year and may include:
- general ledgers (if you do not have a ledger, include at least 6 months of receipts)
- spreadsheets.
- income and expense journals (include a statement explaining why the claimed expenses relate to the business income)
- travel log or mileage statement, if applicable.
How is business interruption insurance calculated?
The business interruption formula can be summarized as follows.
- BI = T x Q x V.
- BI = business interruption.
- T = the number of time units (hours, days) operations are shut down.
- Q = the quantity of goods normally produced, or sold, per unit of time used in T.
What triggers business interruption insurance?
Business interruption insurance is insurance coverage that replaces income lost in the event that business is halted due to direct physical loss or damage, such as might be caused by a fire or a natural disaster.
How do I file a business interruption claim?
Tips for Filing a Business Interruption Insurance Claim
- Step 1: Read Your Policy. Find your declaration sheet and policy details.
- Step 2: Keep an Eye on the Time. Many policies require timely notice.
- Step 3: File a Claim.
- Step 4: Keep Thorough Records.
- Step 5: Calculate Income Loss.
- Brady Martz is Here to Help.
Can insurers deduct furlough payments from business interruption claims?
“A policyholder must not be permitted to gain from their loss and Furlough payments in addition to indemnity would constitute a ‘windfall’ benefit.” “Alternatively, furlough payments should be deducted from the Business Interruption payments and such monies returned to HMRC via tax adjustments.”
When does business interruption / loss of income get reported?
Since business interruption/loss of income relates to a period of time, does this portion of the insurance proceeds get reported during the time period it applies rather than as the time of the loss? For cash flow reporting the insurance advances must be identified as either related to investing or operating activities.
How are extra expenses calculated for business interruption?
Extra expenses are based upon the amount actually paid or incurred and the insurance company generally requests the invoice, proof of payment and brief explanation why the extra expense was incurred. Projection of lost net business income should be based upon the best information available.
How is business interruption included in an insurance policy?
Coverage for business interruption losses and related extra expenses are often included in property and casualty insurance policies. The insurance policy defines the terms of coverage.
Can a Certified Public Accountant calculate business interruption loss?
The coverage is designed to put the insured in the position they would have been in had the loss event not occurred and is not intended to be a windfall to the insured. The certified public accountant has the training and experience to calculate loss of business income and extra expenses in business interruption matters.