NJ UIM Underinsured Motorist Claims — Strategies When the At-Fault Driver’s Policy Falls Short

PERSONAL INJURY LAW · SONG LAW FIRM COLUMN

Situation

Serious injuries with modest at-fault insurance coverage are common in NJ. New Jersey minimum liability limits are only $15,000 per person (N.J.S.A. 39:6B-1), and many drivers carry only the minimum. When medical bills alone reach tens of thousands of dollars, the at-fault carrier cannot make you whole.

This is where Underinsured Motorist (UIM) coverage on your own auto policy comes in. UIM is a safety net that allows recovery from your own insurer for the shortfall.

Legal Concept

NJ distinguishes UIM from UM:

• UM (Uninsured Motorist): applies when the at-fault driver has no insurance or is a hit-and-run
• UIM: applies when the at-fault driver has insurance but limits are inadequate

The core of NJ UIM claims is the gap requirement. Your UIM limit must exceed the at-fault liability limit for the claim to trigger. The recoverable amount is capped at your UIM limit minus the at-fault liability limit — the offset formula.

Example: At-fault liability $15,000, your UIM $100,000, actual damages $80,000

• At-fault carrier pays $15,000
• UIM claim ceiling: $100,000 − $15,000 = $85,000
• Of the $80,000 in damages, $15,000 already paid; UIM covers up to the remaining $65,000

NJ Rules

NJ UIM claims require several procedural steps.

• Longworth Notice: Before accepting a tender of the at-fault carrier's full limits, you must give written notice to your own UIM carrier. Settling without this notice can allow the UIM carrier to deny payment for loss of subrogation rights.
• 30-day response window: The UIM carrier has 30 days after notice to "substitute" — pay the at-fault limits directly to preserve its own subrogation position.
• Mandatory arbitration: Most NJ UIM policies require disputes to go to a 3-person arbitration panel rather than court litigation.
• Statute of limitations: The default contract-claim period is 6 years (N.J.S.A. 2A:14-1), but individual policies may impose separate notice and claim deadlines.

Practical Response

• Review your own auto policy declarations page immediately — confirm UIM limits
• Anti-Stacking: NJ is an anti-stacking state; multi-vehicle households cannot stack UIM limits across policies
• Always send Longworth Notice before settling with the at-fault carrier
• Document all communications with your own UIM carrier — email and certified mail
• For arbitration, retain an economist and complete medical documentation to quantify losses

Recognize that your own carrier becomes adverse once a UIM claim is filed. It will investigate, contest, and delay to minimize payout — separate legal counsel is essential.

Common Misunderstandings

• "My insurer is on my side." Once you invoke UIM, your carrier is effectively adverse.
• "UIM automatically stacks on top of at-fault limits." No — it applies the offset formula, capped at your UIM minus at-fault liability.
• "I can stack UIM across multiple vehicles." NJ prohibits stacking.
• "Settle quickly with the at-fault carrier, then pursue UIM." Failing to send Longworth Notice may forfeit your UIM claim.

Key Takeaways

• UIM covers the shortfall when the at-fault driver's policy is inadequate
• Claim ceiling = your UIM limit minus at-fault liability limit
• Longworth Notice is mandatory before settling with the at-fault carrier
• NJ prohibits stacking across policies
• Most UIM disputes resolve via 3-person arbitration, not court

FAQ

Q1. If my UIM limits equal the at-fault limits, can I still claim?

Generally no. NJ UIM triggers only when your UIM limit exceeds the at-fault limit — the gap requirement.

Q2. The at-fault driver has already tendered full policy limits and my injuries exceed that. What now?

Give Longworth Notice to your UIM carrier. Once the 30-day response window expires, UIM proceeds.

Q3. How long does UIM arbitration take?

Typically 6-12 months — faster than court litigation, slower than early settlement.

Q4. Is there a statute of limitations on UIM claims?

Default is 6 years for contract claims (N.J.S.A. 2A:14-1), but individual policies impose their own notice and claim deadlines that must be checked promptly.

Q5. What if I disagree with the arbitration outcome?

Arbitration awards are generally final. Under limited NJ arbitration jurisprudence, vacatur is possible but the grounds are narrow.