Summary: There are a multitude of ISO commercial auto endorsements, and year by year, the list keeps growing. Rather than attempt a discussion of all of the endorsements in one commentary, we will provide a listing, brief discussion and explanation of each of the endorsements by the way they are categorized by ISO – Amendatory endorsements (Categories 01 and 05), Cancellation and Suspension endorsements (Category 02), Deductible endorsements (Category 03), Additional Coverage endorsements (Category 04), Specialized Types endorsements (Category 20), Uninsured Motorists endorsements (Category 21), No-Fault endorsements (Category 22), Commercial Auto endorsements (Category 23), Public Transportation endorsements (Category 24), Garage endorsements (Category 25), Single Interest endorsements (Category 26), Additional Garage endorsements (Category 27), Special Types endorsements (Category 28), and Common Coverages and Rating Procedures endorsements (Category 99).

The first of these commentaries addressed Categories 01, 02, 03 and 05.

The next categories of endorsements discussed were Categories 04, Additional Coverage endorsements, and 20, Specialized Types endorsements, then 23 – Commercial Auto endorsements. These are varying endorsements that address certain exposures and coverages not otherwise categorized.