Glossary
Endorsement
An endorsement is a written form attached to an insurance policy that modifies, adds to, or removes terms from the base policy.
Plain-English summary
Many common trucking requests—additional insured status, waiver of subrogation, reefer breakdown, MCS-90, or a named loss payee—require an endorsement. A certificate cannot create coverage that an endorsement does not first establish in the policy.
Endorsements commonly seen in commercial trucking
- MCS-90: federal motor carrier public liability endorsement for certain regulated operations
- Additional insured: grants insured rights to a named party when the policy supports it
- Waiver of subrogation: may limit the insurer's recovery rights against a specified party
- Loss payee: directs physical damage proceeds to a lender or lienholder
- Reefer breakdown: adds mechanical refrigeration unit failure to cargo coverage when included
- Trailer interchange: adds coverage for non-owned trailers under a written interchange agreement
Why endorsements require insurer approval
An endorsement cannot be added to a certificate by writing a name or phrase. The insurer must evaluate and approve the request, issue the form, and may charge additional premium. Some endorsements are standard on certain policy forms; others require underwriting review and may not be available on all programs.
Who usually runs into this term
- Owner-operators reading a quote
- New authorities preparing documents
- Small fleets reviewing certificates or claims
Why the term matters
- Where the term appears
- How to discuss it with an agent
- Why the definition can affect coverage
How this term gets misread
What the term does not prove
- A standalone guarantee of coverage
- A substitute for policy wording
- Legal advice about a contract
Common interpretation mistakes
- Treating informal shorthand as policy language
- Assuming the same word means the same thing in every policy
Documents where it may appear
- Policy declarations
- Certificates
- Endorsements
- Contracts or official filing notices when relevant
Questions to ask about this wording
- Where is this term defined in the policy?
- Does an endorsement change the meaning?
- Does a regulator or contract use the term differently?
Sources
- Auto Insurance Regulator National Association of Insurance Commissioners — checked 2026-05-19
- Commercial Auto Insurance Educational Insurance Information Institute — checked 2026-05-19
Questions carriers ask
What happens if a carrier promises an endorsement the insurer will not issue?
The carrier may be unable to fulfill a contract requirement. This can delay broker onboarding, create a contract dispute, or leave the carrier in a position where the promised wording does not exist in the policy. Contract wording should be sent to the agent for review before it is agreed to.
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