Surreal illustration of lost revenue symbolized by a broken hourglass.

Lost Profits Forecasts: How to Project Revenue with Accuracy

"Navigate the complexities of projecting lost revenue with proven methods and expert insights. Ensure your forecasts are reliable and defensible."


When a business suffers an interruption, accurately measuring the resulting lost profits is crucial. This process begins with projecting the revenue that the business would have earned had the interruption not occurred—the "but for" revenue. This projection then serves as the basis for calculating the overall financial damage.

Projecting lost revenue involves a variety of techniques, ranging from simple extrapolation of historical data to sophisticated statistical modeling. The choice of method depends on the availability of data, the complexity of the business, and the need for accuracy and defensibility.

This article explores the key methods for projecting lost revenue, highlighting their strengths and weaknesses. Whether you're an attorney, forensic accountant, or business owner, understanding these techniques is essential for navigating business interruption claims.

Why Is Selecting the Right Revenue Base So Critical?

Surreal illustration of lost revenue symbolized by a broken hourglass.

Before diving into forecasting techniques, it’s essential to define the relevant revenue base. This involves identifying the specific products, services, or geographic markets directly affected by the interruption. Using total sales figures without considering these nuances can lead to inaccurate projections.

For example, if a business has multiple product lines and only one was affected by the interruption, the revenue projection should focus solely on that product line. Similarly, if the business operates in multiple geographic markets, the projection should focus on the affected regions.
  • Product Line Specifics: Focus on the revenue streams directly impacted.
  • Geographic Precision: Account for regional variations and impacts.
  • Expert Insight: Ensure alignment with economic factors and industry standards.
Furthermore, some situations might warrant considering the "spillover" effects, where the disruption of one product line impacts others. In such cases, the expert must convincingly demonstrate the link between the different product lines to justify including them in the revenue projection.

Ensuring Accuracy and Reliability in Revenue Projections

Projecting lost revenue is a complex undertaking that requires careful consideration of various factors. By understanding the available techniques, selecting the appropriate revenue base, and accounting for potential pitfalls, you can create reliable and defensible financial forecasts. Whether for litigation or internal business planning, accurate revenue projections are essential for making informed decisions.

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