| John Bosman | 1,309 words
Carrying your own auto insurance doesn't guarantee you're covered if someone else causes a wreck — if the at-fault driver has no insurance, or not enough of it, their policy (or lack of one) can leave you paying for your own medical bills and repairs out of pocket. This isn't a rare edge case: according to the Insurance Research Council, one in three drivers nationally (33.4%) were either uninsured or underinsured in 2023, up 10 percentage points since 2017, and more than one in seven (15.4%) carried no insurance at all. Uninsured motorist (UM) coverage and underinsured motorist (UIM) coverage exist specifically to close that gap. They're easy to confuse, and Minnesota's rules add a few wrinkles that don't apply everywhere — this guide explains the difference in plain English, walks through a real numeric example, and covers what's required versus what's optional here.
Short answer
UM/UIM coverage closes the gap when the at-fault driver is uninsured or underinsured. Minnesota requires both by law, but minimum limits rarely match real-world injury costs. This guide covers how each coverage works, the $150k/$50k/$100k gap example, Minnesota-specific rules, and how to choose limits that fit your household.
Reader checkpoint
- Do you know what UM/UIM limits you currently carry — and whether you signed a written rejection of higher limits at any point?
- If you were seriously injured by an uninsured driver tomorrow, would your UM/UIM limits cover the realistic cost of medical bills, lost wages, and recovery?
- Have your income, household size, or assets changed since you last chose your UM/UIM limits — meaning the exposure you're protecting against has grown?
Quick answer
UM coverage pays when the at-fault driver has no insurance. UIM coverage pays when they have insurance but not enough. In Minnesota, both are required by law — but the state minimum limits are often too low to cover a serious injury. This guide explains how each works, what the limits mean in practice, and how to choose coverage that fits your actual exposure.
At a glance
| UM covers | At-fault driver has no insurance (or hit-and-run with physical contact in MN) |
|---|---|
| UIM covers | At-fault driver's limits are too low to cover your full loss |
| MN requirement | Both required by law; lower limits require written rejection |
| Common benchmark | 100/300 — matches or exceeds most liability limits |
Defined Q&A
UM/UIM Coverage Explained: Uninsured vs Underinsured Motorist (Stress-Free Guide): common questions
Is UM/UIM coverage required in Minnesota?
Yes. Minnesota law requires both uninsured and underinsured motorist coverage. Insurers must offer UM/UIM at limits equal to your liability limits, but you can reject higher limits in writing.
What's the difference between UM and UIM?
UM (uninsured motorist) applies when the at-fault driver has no insurance. UIM (underinsured motorist) applies when they have insurance but not enough to cover your full loss.
Does UM/UIM cover hit-and-run accidents in Minnesota?
UM coverage in Minnesota applies to certain hit-and-run accidents when there is physical contact with the unidentified vehicle. No-contact hit-and-run situations are handled differently.
How much UM/UIM coverage should I carry?
A common benchmark is $100,000/$300,000 — matching or exceeding your liability limits. Higher earners or households pairing with an umbrella policy often carry $250,000/$500,000.
UM/UIM coverage is one of the few places in auto insurance where the decision is almost entirely about your own household's exposure, not the other driver's. We help clients in Minnesota and across the country choose limits that feel intentional rather than reactive.
What is UM/UIM coverage?
Uninsured and underinsured motorist coverage (UM/UIM) is auto insurance that pays for your injuries and related losses when the driver who caused the accident either has no insurance (uninsured) or doesn't have enough insurance to cover the full damage they caused (underinsured).
It protects your household from a situation you can't control: the coverage decisions of the person who hit you. In Minnesota, UM/UIM coverage is required by law, and minimum limits are set by statute — but required minimums and adequate protection are not the same thing.
If you want the big-picture map of how auto coverages fit together, start here: Auto Insurance Explained (Personal).
UM vs. UIM: what's the difference?
Uninsured Motorist (UM) applies when the at-fault driver has no liability coverage at all — or in some hit-and-run situations, depending on your state and policy. In Minnesota, UM coverage also applies to certain hit-and-run accidents when there is physical contact with the unidentified vehicle.
Underinsured Motorist (UIM) applies when the at-fault driver has liability coverage, but their limits are too low to cover the full loss. UIM coverage steps in after the at-fault driver's liability policy is exhausted.
A quick example: if you're injured and your damages total $150,000, and the other driver carries only $50,000 per person in liability, their insurer may pay up to $50,000. The remaining $100,000 gap may fall to you — unless your UIM coverage applies, subject to your policy limits and state rules.
What UM/UIM covers — and what it doesn't
UM/UIM Bodily Injury (most common): medical bills, lost wages, pain and suffering (depending on state and policy structure). In Minnesota, UM/UIM bodily injury coverage is mandatory and must be offered at limits matching your liability limits unless you sign a written rejection of higher limits.
UM/UIM generally does not cover: routine vehicle repairs after a crash (collision coverage handles that), damage from hail, theft, or vandalism (comprehensive), medical expenses covered by your no-fault/PIP coverage (in Minnesota, no-fault pays first), or mechanical breakdown.
If you want a refresher on how collision and comprehensive work, this guide helps: Understanding Collision and Comprehensive Auto Coverage.
How UM/UIM works after an accident in Minnesota
Minnesota is a no-fault state, which means your own no-fault (PIP) coverage pays first for medical expenses and wage loss, regardless of who caused the accident. UM/UIM becomes relevant when your losses exceed your no-fault limits, or when you pursue a liability claim against the at-fault driver.
In many cases, the process looks like this: you report the accident and open a claim; your no-fault coverage pays for initial medical bills and wage loss; if losses exceed no-fault limits, liability is investigated; if the other driver is uninsured or underinsured, your insurer evaluates whether UM/UIM applies.
If an accident happens and you're not sure what to do next, see: What to Do After a Car Accident: An Insurance Timeline (Step-by-Step).
Minnesota's statutory minimums and the written-rejection requirement
Minnesota law sets minimum UM/UIM limits at $25,000 per person / $50,000 per accident. These minimums must be offered at limits equal to your liability limits, unless you sign a written rejection of the higher limits.
The written-rejection requirement exists to make sure you're making an active choice — not just defaulting to the minimum because it's cheaper. If you've never been asked to sign a rejection form, it's worth confirming what limits you actually carry.
How to choose your UM/UIM limits
A practical rule of thumb: match your UM/UIM limits to your liability limits, or as close as your budget allows. If you're choosing liability limits, start here: How Much Liability Car Insurance Do You Need? (Stress-Free Guide).
| Limit tier | Per person / per accident | Who it fits |
|---|---|---|
| State minimum | $25,000 / $50,000 | Meets legal requirement; often too low for serious injuries |
| Mid-tier | $50,000 / $100,000 | Better buffer; still may fall short in multi-injury accidents |
| Common benchmark | $100,000 / $300,000 | Matches or exceeds most liability limits; reasonable starting point |
| Higher earners / umbrella pairing | $250,000 / $500,000 | For households with significant income exposure or umbrella policy |
What to do next
Use the related tool or ask for a review before you make coverage changes.
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