Excess Layer Loss Development Manuals

ISO's Reinsurance Package - essential analytical and pricing tools for reinsurance underwriters and actuaries

With the detailed information in ISO's Excess Layer Loss Development Manuals, you can develop losses and payout patterns for excess layers and compare those patterns to ISO aggregate excess loss development patterns.

Manuals are available for commercial auto, general liability, and medical professional liability. The manuals break the information down into 14 different layers, providing the most detailed information available.

You will receive loss development factors with allocated loss adjustment expenses (ALAE) excluded, ALAE included with indemnity before being allocated to layer, and ALAE allocated to layer in the same proportion as indemnity. You also get data on paid loss, paid count, incurred loss, and incurred count.


  • Excel spreadsheets
  • Hard copy available by request

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The products in ISO's Reinsurance Package are available as a package or individually. For your needs that go beyond the scope of ISO's Reinsurance Package of products, ISO offers reinsurance consulting services. Talk to one of our experts to find out how we can help.

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A 5-minute pricing tool for the excess and surplus and reinsurance markets