Indiana Does Not Require Underinsured Motorist Coverage
Indiana law does not mandate underinsured motorist (UIM) coverage on your auto policy. The state requires only liability insurance: $25,000 per person for bodily injury, $50,000 per accident, and $25,000 for property damage. Carriers must offer UIM when you purchase a policy, but you can decline it in writing.
When you insure two, three, or four vehicles on one Indiana policy, that optional status does not change. The carrier will present UIM as an add-on for the entire policy, not per vehicle. Declining it means every car and every driver on the policy goes without UIM protection, even though 14% of Indiana motorists drive uninsured and many more carry only the state minimum liability limit.
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Get Your Free QuoteIndiana Uninsured Motorist Rate
14%
One in seven Indiana drivers operates without insurance. When an at-fault driver carries no coverage or only the $25,000 minimum, your household's medical bills, lost wages, and repair costs can exceed their liability limit quickly—especially when multiple vehicles or occupants are involved.
Insurance Research Council, 2023
What Underinsured Motorist Coverage Actually Pays
UIM coverage steps in when the at-fault driver's liability limit is insufficient to cover your household's damages. Indiana is an at-fault state: the driver who caused the collision is responsible for your injuries and vehicle damage, up to their liability policy limit.
Your UIM coverage pays the difference between the at-fault driver's limit and your actual damages, up to the UIM limit you purchased. If you bought $50,000 per person in UIM and the at-fault driver carried $25,000, your UIM pays up to $25,000 more. UIM applies to bodily injury only in Indiana—property damage from an underinsured driver is not covered under UIM; you would file that claim under your own collision coverage if you carry it.
On a multi-vehicle policy, one UIM limit applies to every car and every driver listed. If two household members are injured in separate incidents within the same policy term, each can claim up to the per-person UIM limit, subject to the per-accident cap. The coverage does not multiply by vehicle count; it is a shared policy-level resource.
Declining UIM on a multi-car policy leaves every vehicle and driver exposed when the at-fault driver's $25,000 liability limit falls short of your household's total claim.
How UIM Interacts With a Multi-Vehicle Household
Carriers price UIM as a policy-level add-on, not a per-vehicle charge. Adding UIM to a three-car policy costs more than adding it to a one-car policy because the insurer's exposure increases—more drivers, more miles, more claim opportunities—but the structure remains the same: one UIM limit covering all listed vehicles and drivers. You cannot buy UIM for one car and skip it for another on the same policy.
The shared-limit structure creates a coverage gap when multiple household members are injured in the same accident. This per-accident cap is standard across Indiana carriers and applies whether you insure one car or five.
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When Declining UIM Becomes Expensive
A household with multiple vehicles faces higher total exposure when an at-fault driver is underinsured. If a driver carrying only the $25,000 minimum causes a collision that damages two of your cars and injures two household members, their liability insurer pays $25,000 per person for injuries (up to $50,000 total) and $25,000 for property damage. Without UIM, you absorb the shortfall.
Collision coverage on your own policy pays for vehicle repairs minus your deductible, but it does not cover the medical bills, lost wages, or pain-and-suffering damages that UIM would. If you declined UIM to keep the multi-car premium manageable, your household's out-of-pocket exposure grows with every additional driver and vehicle on the policy.
Indiana law does not require you to carry UIM, but carriers must offer it at limits equal to your liability coverage unless you reject it in writing. That written rejection stays on file; if you later want to add UIM mid-term, the carrier will allow it, but the coverage will not apply retroactively to any incident that occurred while you were uninsured.
Indiana Minimum Bodily Injury Limit
$25,000
Indiana requires only $25,000 per person in liability coverage. A driver carrying the minimum who causes a serious injury cannot pay more than that amount, leaving your household to cover the difference unless you carry UIM.
Indiana Code 9-25-4-5
Structuring UIM Across Multiple Vehicles
When you quote a multi-vehicle policy in Indiana, the carrier will present UIM limits that match your liability limits by default. You can decline UIM entirely, or you can purchase lower UIM limits than your liability limits, but you cannot purchase higher UIM limits than your liability limits under Indiana law.
Households that insure teen drivers, high-mileage commuters, or multiple vehicles often choose UIM limits above the state minimum because the risk of encountering an underinsured driver increases with exposure. A household driving 40,000 combined miles per year across three cars has more claim opportunities than a household driving 12,000 miles in one car. Carriers price UIM accordingly, but the per-vehicle increment is typically smaller than the base policy-level charge.
Compare Carriers That Write Multi-Vehicle Policies in Indiana
Not every carrier prices UIM the same way on a multi-vehicle policy. Some apply a flat policy-level charge; others scale the UIM premium by vehicle count and driver profile. When you compare quotes, ask each carrier how they structure UIM on a household policy with two or more cars, and whether declining UIM reduces the premium enough to justify the exposure. Carriers writing multi-vehicle policies in Indiana include State Farm, Geico, Progressive, Allstate, Nationwide, and others listed in the state roster above. Compare UIM pricing alongside liability and collision coverage to see the total cost of protecting every vehicle and driver on your policy.