What New Jersey Actually Requires
You're structuring coverage for multiple vehicles in New Jersey and trying to confirm whether underinsured motorist coverage is mandatory. The answer: New Jersey requires uninsured motorist coverage on every auto policy but does not require underinsured motorist coverage. The two coverages sound similar but are legally distinct products.
Uninsured motorist coverage pays when the at-fault driver has no insurance at all. Underinsured motorist coverage pays when the at-fault driver carries liability insurance but their limits are too low to cover your damages. New Jersey mandates the first and makes the second optional. This distinction matters when you're adding vehicles or combining household policies — you must carry uninsured motorist on every car, but you choose whether to add underinsured.
Compare car insurance rates in your state
Get quotes from licensed carriers — no obligation, no spam, results in minutes.
Get Your Free QuoteNJ Uninsured Motorist Rate
14.1%
More than one in seven drivers on New Jersey roads carries no insurance, despite the state's mandatory coverage law. That rate is why uninsured motorist coverage is required on every policy.
Insurance Information Institute, 2023
Why the Confusion Exists
Most drivers assume uninsured and underinsured motorist coverages are packaged together because many carriers sell them as a combined product. When you request a quote, the carrier often presents "UM/UIM" as a single line item with one combined limit. That presentation makes it look like a single mandatory coverage.
The structural reality: New Jersey law treats them as separate coverages. The state requires uninsured motorist coverage at minimum limits that match your liability policy. Underinsured motorist coverage is an add-on you can accept or reject in writing. Carriers bundle them for convenience, but the legal mandate applies only to the uninsured portion.
This matters when you're comparing policies for multiple vehicles. A carrier that quotes "UM/UIM $35,000/$70,000" is offering both coverages together, but only the UM portion is legally required. You can decline the UIM portion and still meet New Jersey's requirements, though most households with multiple vehicles choose to keep both.
New Jersey requires uninsured motorist coverage on every policy. Underinsured motorist coverage is optional — you must decline it in writing if you don't want it.
How the Two Coverages Work
Uninsured motorist coverage pays when the at-fault driver has no insurance. New Jersey requires minimum limits of $35,000 per person and $70,000 per accident for bodily injury, matching the state's liability minimums. If an uninsured driver hits your car and injures you or your passengers, your uninsured motorist coverage pays medical bills, lost wages, and other damages up to your policy limits. This coverage also applies in hit-and-run accidents where the at-fault driver is never identified.
Underinsured motorist coverage pays when the at-fault driver carries liability insurance but their limits are too low to cover your damages. Their liability policy pays its $35,000 limit, and your underinsured motorist coverage pays the remaining $25,000 if you carry limits high enough to cover the gap. Without underinsured coverage, you would pay the $25,000 shortfall out of pocket or pursue the at-fault driver personally.
Related Articles
What Happens When You Add a Vehicle
When you add a second or third vehicle to your New Jersey policy, the carrier automatically applies uninsured motorist coverage to the new vehicle because the state requires it. The underinsured motorist coverage decision is separate. If your existing policy includes underinsured coverage, the carrier typically applies the same limits to the new vehicle unless you decline in writing.
This creates a decision point for households managing multiple cars. You can carry uninsured motorist coverage only and meet New Jersey's legal requirements. You can add underinsured motorist coverage to match your uninsured limits, giving you a second layer of protection. Or you can carry underinsured limits higher than your uninsured limits if you want more protection against drivers who carry minimal insurance.
Most carriers writing multi-vehicle policies in New Jersey bundle uninsured and underinsured coverage at the same limits because it simplifies administration and because the cost difference between uninsured-only and combined UM/UIM is typically small. But the legal mandate applies only to uninsured — the underinsured portion is always optional.
NJ Minimum Liability Limits
$35,000 / $70,000
New Jersey requires $35,000 per person and $70,000 per accident in bodily injury liability, plus $25,000 in property damage liability. Uninsured motorist coverage must match your liability limits at minimum.
New Jersey Motor Vehicle Commission
When Underinsured Coverage Makes Sense
Households with multiple vehicles face higher exposure to underinsured drivers because more cars on the road means more opportunities for an accident. If one of your household's vehicles is hit by a driver carrying only New Jersey's minimum $35,000 per person liability limit, and the medical bills exceed that amount, underinsured motorist coverage pays the difference up to your policy limits. Without it, you pay out of pocket or sue the at-fault driver.
The decision depends on your household's asset position and medical insurance. If you carry health insurance with low out-of-pocket maximums, your health plan may cover most accident-related medical bills regardless of the at-fault driver's limits. If you do not carry health insurance or carry a high-deductible plan, underinsured motorist coverage functions as a backstop when the at-fault driver's liability limits fall short. Households with significant assets to protect typically carry underinsured limits equal to or higher than their liability limits.
Compare Carriers for Your Household
Seventeen carriers write auto insurance for New Jersey households with multiple vehicles, including Allstate, Geico, Progressive, State Farm, and Farmers. Each prices uninsured and underinsured motorist coverage differently, and the cost difference between uninsured-only and combined UM/UIM varies by carrier. Some carriers offer underinsured coverage at a minimal additional premium; others price it as a more substantial add-on.
Request quotes that show uninsured motorist coverage only and combined UM/UIM coverage so you can see the cost difference for your household's vehicles. Compare the underinsured premium against your household's medical insurance coverage and asset exposure. The goal is not to find the cheapest policy but to structure coverage that protects your household across all vehicles without paying for redundant protection your health insurance already provides.