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Calculating Lost Rental Income for Insurance Claims

crunching numbers

When a property becomes uninhabitable due to damage from fire, storms, water, or other covered perils, landlords may lose out on rental income. Fortunately, many insurance policies include Loss of Rent or Business Income coverage, which reimburses property owners for the rental income they would have earned during the period of restoration. Calculating lost rental income accurately is crucial for a successful insurance claim. Here are some points to consider when evaluating a lost rental income claim.  

1. The Insurance Policy

Before calculating your claim, review your insurance policy to determine:

  • Coverage Limits: The maximum amount the insurer will pay.
  • Covered Perils: Events for which you are eligible to file a claim.
  • Period of Restoration: The reasonable time needed to repair or rebuild the property.
  • Waiting Period: Some policies include a 24–72 hour waiting period before coverage kicks in.
2. The Period of Restoration

The period of restoration begins when the damage occurs and ends when the property is reasonably restored to its pre-loss condition, not necessarily when repairs are completed. This period must be:

  • Reasonable and Necessary: Based on typical construction timelines.
  • Documented: Through contractor estimates, permits, and repair schedules.

Insurers often require detailed evidence to support the claimed duration.

3. Identify Monthly Rental Income

You must determine how much rent you were collecting or expected to collect. Consider:

  • Lease Agreements: Show actual rental rates and tenant responsibilities.
  • Rent Rolls: Details the rental income and occupancy history per unit. 
  • Comparable Market Rent: If the property was vacant, use market analysis or appraiser reports to estimate potential income.

Be sure to exclude non-rent payments like utility reimbursements unless otherwise specified in your policy.   

4. Calculate Gross Rental Income Loss

Use the following formula:

Lost Rental Income = Monthly Rent x Number of Months Property is Uninhabitable

Example:

  • Monthly rent: $2,000
  • Property uninhabitable for 6 months
  • Lost rental income: $2,000 x 6 = $12,000
5. Deduct Expenses Saved During the Loss Period

Subtract any expenses you did not incur because the property was vacant. These may include:

  • Utility costs (if landlord-paid)
  • Maintenance or cleaning services
  • Property management fees (if charged per unit or based on occupancy)

This yields your net lost rental income.

Net Loss = Gross Rental Income – Expenses Saved

6. Provide Supporting Documentation

A well-documented claim is less likely to be delayed or denied. Include:

  • Lease agreements or rent rolls
  • Monthly profit and loss statements
  • Prior year income statements or tax returns
  • Payroll reports
  • Communications with tenants (e.g., notices to vacate)
Conclusion

Calculating lost rental income for insurance claims involves more than simply multiplying rent by the number of months the property is vacant. By carefully documenting income, understanding the policy, and factoring in saved expenses, you can present a well-founded claim.

For further information, please contact the experts at FAZ Forensics. 


Charles Amodio

Charles Amodio is a Certified Public Accountant and Partner with FAZ Forensics. A Master Analyst in Financial Forensics and Certified in Financial Forensics, he focuses on economic damage analysis, specializing in evaluating lost earnings for individuals as a result of personal injury, wrongful death, and employment disputes.

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