Imagine this: you are driving home from campus when another car runs a red light and hits you. You are hurt, your car is damaged, and the other driver hands you an expired insurance card -- or no card at all. Your own liability insurance will not help you here, because it only pays for damage you cause to others. This is exactly the gap that uninsured and underinsured motorist coverage (UM/UIM) fills. For most college students it is the cheapest, most overlooked protection on the policy.
What UM/UIM Actually Covers
UM/UIM is really two protections in one. Uninsured motorist (UM) coverage steps in when the at-fault driver has no insurance. Underinsured motorist (UIM) coverage steps in when the at-fault driver has insurance, but their limits are too low to cover your bills.
Each part has two pieces:
Bodily injury (UMBI/UIMBI): pays your medical bills, lost wages, and pain-and-suffering if you or your passengers are hurt. It usually has no deductible.
Property damage (UMPD/UIMPD): repairs your own car or other property when an uninsured driver cannot pay. It typically carries a $200 to $500 deductible and is available in only 25 states plus Washington, D.C.
Why Students Skip It -- and Why That Is a Mistake
The most common reason students decline UM/UIM is that it sounds expensive. It is not. Combined UM/UIM typically costs just $5 to $7 per month -- about $60 to $84 per year. Bumping your bodily injury limit from 25/50 to a stronger 100/300 usually adds less than $50 per year. For the price of a single coffee each week, you protect yourself against tens of thousands in medical bills.
Sample state costs for UMBI at a 100/300 limit run about $86 to $134 per year; at a 25/50 limit, just $33 to $76 per year. In low-uninsured states such as Massachusetts, the annual cost can be as little as $11.
The 1-in-3 Problem
This is not a theoretical risk. According to the Insurance Research Council (2025 report, using 2023 data), 15.4% of U.S. drivers have no insurance at all, and a striking 33.4% are uninsured or underinsured -- roughly one in three. The worst states are sobering:
Mississippi: 28.2% uninsured
New Mexico: 24.1%
Washington, D.C.: 23.1%
Michigan: 22.3%
Tennessee: 21.3%
Missouri: 20.7%
Florida: 20.6%
California: 20.4%
If you are a student in any of these states -- or drive through them -- the odds of meeting an uninsured driver are far higher than most people expect.
What Happens When an Uninsured Driver Hits You
Make sure everyone is safe and call 911.
Get a police report -- it is your proof that the other driver was at fault and uninsured.
Photograph the scene, the vehicles, and your injuries.
Collect witness contact information.
File a UM claim with your own insurer and supply medical bills, proof of lost wages, and repair estimates.
A key detail: UIM only activates after the at-fault driver's own policy limits are exhausted. If their $25,000 limit is not enough to cover your $60,000 in bills, your UIM pays the difference (up to your limit). And importantly, a not-at-fault UM claim generally does not raise your premium.
Hit-and-Run Protection
A hit-and-run driver is, by definition, unidentified and therefore treated as uninsured in most states. Your UMBI coverage can pay your medical costs -- but you must file a police report, and a few states require that there was actual physical contact between the vehicles. Never just drive away from a hit-and-run; the police report is what unlocks your coverage.
Stacking: A Free Multiplier in Many States
In about 30 states, you can "stack" UM/UIM limits -- combining the limits across multiple vehicles on your policy, or across policies in the same household, to multiply your effective coverage. Florida is the best-known example. Stacking costs a little more but can double or triple what you collect after a serious crash. Ask your agent whether your state allows it.
Which States Require It
UM/UIM is mandatory in more places than students realize. About 20 states plus D.C. require uninsured motorist (UM) coverage. A separate group of 14 states require underinsured motorist (UIM) coverage: Connecticut, Maine, Maryland, Massachusetts, Minnesota, Nebraska, New Jersey, North Carolina, North Dakota, Oregon, South Dakota, Vermont, Virginia, and Wisconsin. New Jersey and Virginia both raised their minimum UM limits in 2026. Even where it is optional, adding it is one of the highest-value dollars you will spend on your policy.
How Much Should a Student Buy?
The standard advice is simple: match your UM/UIM limits to your own liability limits. If you carry 100/300 liability, carry 100/300 UM/UIM. Since the price jump between low and high limits is tiny (often under $50 per year), there is little reason to skimp. If your state offers UMPD, keep it -- a small $200 to $500 deductible is far better than paying for your own collision repair after an uninsured driver wrecks your car.
Bottom line: UM/UIM is the coverage that protects you from other people's bad decisions. For most students it costs less than a streaming subscription each month -- and after a crash with an uninsured driver, it can be the difference between a paid hospital bill and years of debt.
About the Author
Written by Sarah Mitchell, founder of Student Car Insurance Guide. Sarah spent 8 years as a licensed insurance agent helping young drivers and their families find affordable coverage. Every guide on this site is fact-checked against current state regulations and real quote data from major insurers.
Have a question about this topic? Email our editorial team at 1404555604w@gmail.com.
