Car insurance glossary
What is underinsured motorist coverage?
Underinsured motorist coverage can help when an at-fault driver has insurance but not enough to cover a qualifying loss.
Also called: UIM coverage
Glossary date: February 9, 2026
How it works
The coverage often applies to injuries. Property damage availability, offsets, and payment calculations depend on state law and policy language.
Example
Your covered injury claim is larger than the at-fault driver's bodily injury limit. Underinsured motorist coverage may help with the remaining covered amount.
Why it matters
A driver can meet a state minimum and still have too little insurance for a serious accident.
What to check on your policy
Review the limit, stacking rules, offsets, consent requirements, and deadlines before settling with another insurer.
Related car insurance terms
Put the terms into context
Read the full guide, find a nearby GoAuto office, or start a quote with the coverage details you want to discuss.