Tail Factor Calculator

Calculate loss development tail factors for actuarial reserving using exponential decay extrapolation.

Dev Factor Year 1-2

Dev Factor Year 2-3

Dev Factor Year 3-4

Dev Factor Year 4-5

Decay Rate (%)

Tab to move between fields

Tail Factor

1.03

Ultimate Factor

2.062

Cumulative Factor (1-5)2.002

Projected Factor 5-61.015

Projected Factor 6-71.0075

How to Use This Calculator

Enter the cumulative loss development factors from your triangle at the latest available age.
Input any tail assumptions based on industry data or curve-fitting methods.
Review the selected tail factor applied to develop losses to ultimate.
A tail factor > 1.0 acknowledges that some losses are still unreported at the latest triangle age.
Document the basis for the tail selection in your actuarial analysis.

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