Underinsured motorist coverage fills the gap between what the at-fault driver’s liability insurance pays and what the injured plaintiff actually needs to be made whole. The gap is common in Georgia because the statutory liability minimum of $25,000 per person is genuinely minimal, and serious injuries routinely produce damages well above that figure. UIM coverage on the plaintiff’s own policy steps in when the at-fault driver’s coverage exhausts before the plaintiff’s losses are covered. This article walks through how UIM works in Georgia, the statutory framework, the trigger conditions, and the practical mechanics of claims.
The UM/UIM combined statute #
Georgia treats UM and UIM coverage as components of a single statutory scheme under O.C.G.A. § 33-7-11. The same insurer-offering requirement, the same default-limits rule, and the same writing requirements for rejection apply to both. The structural distinction in coverage is functional rather than statutory:
- UM (uninsured motorist): Applies when the at-fault driver has no liability coverage at all.
- UIM (underinsured motorist): Applies when the at-fault driver has some liability coverage, but the coverage is insufficient to cover the plaintiff’s damages.
The same policy that offers UM coverage typically offers UIM coverage under the same limits and the same form (add-on or reduced-by). A policyholder who has UM has UIM. A policyholder who rejected UM in writing has rejected UIM as well, because the offering and rejection apply to the combined coverage.
When UIM coverage triggers #
UIM coverage triggers when three conditions are met:
- The at-fault driver has liability insurance. This distinguishes UIM from UM. The at-fault driver carries some policy.
- The plaintiff’s damages exceed the at-fault driver’s liability limits. UIM does not apply if the at-fault driver’s coverage is sufficient to cover the loss.
- The plaintiff’s UIM limits are higher than the at-fault driver’s liability limits. This is the add-on form requirement. Under reduced-by UIM, the UIM limits must exceed the at-fault driver’s limits by enough to cover the gap after subtraction.
The trigger is the gap between actual damages and available liability coverage, not the severity of the injury alone, because UIM exists to fill recovery gaps rather than to provide an alternative source for claims that the at-fault driver’s policy already covers. A plaintiff with $30,000 in damages against a driver with $25,000 in liability coverage has a $5,000 gap that UIM can fill. A plaintiff with $30,000 in damages against a driver with $50,000 in coverage has no UIM trigger, because the liability policy covers the loss.
The add-on form’s importance for UIM #
The 2008 amendment to § 33-7-11 made add-on the default form for both UM and UIM. UIM is where this matters most. The add-on form matters more for UIM than for UM, because UIM by definition involves some liability recovery. The structural distinction works this way:
Under add-on UIM, the plaintiff with $200,000 in damages and a $25,000 at-fault liability policy plus $100,000 in UIM recovers:
- $25,000 from the at-fault driver’s liability policy
- $100,000 from the plaintiff’s UIM (the full UIM limit, not reduced by the $25K liability)
- Total: $125,000
Under reduced-by UIM, the same numbers produce:
- $25,000 from the at-fault driver’s liability policy
- $75,000 from UIM (reduced by the $25K already paid)
- Total: $100,000
The $25,000 difference can determine whether the plaintiff recovers a meaningful portion of the actual damages. For serious-injury cases, add-on UIM is materially better protection.
How UIM claims interact with the underlying liability claim #
A UIM claim sits on top of, not in place of, the underlying liability claim. The procedural sequence typically runs:
- Liability claim against the at-fault driver’s insurer. The plaintiff pursues the at-fault driver’s policy first.
- Notice to the UIM insurer. Once it becomes clear the liability policy will exhaust before the damages are covered, the plaintiff notifies the UIM insurer.
- Consent to settle from the UIM insurer. Most UIM policies require the policyholder to obtain consent before settling with the at-fault driver. Settling without consent can void UIM coverage.
- UIM insurer’s right to substitute payment. Some UIM policies give the UIM insurer the right to “substitute” payment, meaning the UIM insurer pays the at-fault driver’s liability limits in exchange for keeping the subrogation rights against the at-fault driver. This protects the UIM insurer’s recovery.
- UIM claim proceeds. Once the liability claim is settled (or the limits are tendered), the UIM claim becomes the primary recovery vehicle.
The consent-to-settle requirement is one of the most commonly missed procedural rules in UIM claims. A plaintiff who settles with the at-fault driver without UIM consent risks losing the UIM claim entirely. The relationship between UIM and UM coverage, including stacking and offering rules, is covered in a companion piece in this cluster.
What UIM covers and does not cover #
UIM coverage covers the same categories of damages as the underlying liability claim, subject to the UIM policy limits. The categories track tort recovery. UIM damages mirror tort damages:
- Medical expenses (past and future)
- Lost wages (past and future earning capacity)
- Pain and suffering and other non-economic damages
- Other personal injury damages recoverable in a Georgia tort claim
The scope is tort-equivalent. UIM does not cover:
- Damages that fall within the at-fault driver’s liability policy limits (those are paid by the liability insurer)
- Damages beyond the UIM policy limits (the plaintiff bears any excess)
- Damages from a crash where the at-fault driver had sufficient liability coverage (no UIM trigger)
- The plaintiff’s own fault percentage under modified comparative negligence
The same comparative negligence rules apply to UIM. A plaintiff’s percentage of fault reduces both the underlying tort recovery and the UIM recovery. A plaintiff found 30% at fault recovers 70% of damages. The UIM coverage applies only to the gap between the available liability coverage and the recoverable (reduced) damages.
Stacking UIM coverage #
UIM stacking follows the same general rules as UM stacking. Policy language controls. The specific stacking outcome in any case depends on the policy language, the number of vehicles covered, the relationship between separate policies, and the anti-stacking provisions that the insurer included. Multiple vehicles on a single policy typically permit stacking, subject to the policy’s anti-stacking provisions. Multiple separate policies require more careful analysis of policy language and the relationship between the policies.
For Georgia plaintiffs with serious injuries against low-limits at-fault drivers, stacking can be the difference between a near-total recovery and a partial recovery. The strategy of carrying UIM on multiple policies (auto, motorcycle, RV, etc.) is one way drivers expand their UIM exposure for the worst-case scenarios.
Bad-faith exposure on UIM claims #
UIM claims, like UM claims, are first-party claims against the plaintiff’s own insurer. Bad-faith exposure under O.C.G.A. § 33-4-6 applies when the UIM insurer unreasonably refuses to pay a clear claim. The bad-faith penalty includes:
- The amount owed
- A penalty of up to 50% of the amount or $5,000, whichever is greater
- Reasonable attorney fees
A 60-day demand and refusal procedure under § 33-4-6 is the typical setup for a first-party bad-faith claim. The bona fide controversy doctrine provides the insurer’s primary defense: a refusal to pay grounded in a reasonable dispute over coverage, liability, or damages is not bad faith. Unreasonable delay, unreasonable denial, or unreasonable investigation can support bad-faith liability. UM/UIM-specific bad-faith claims also operate under O.C.G.A. § 33-7-11(j), which authorizes a penalty up to 25% of the recovery or $25,000 (whichever is greater) plus attorney fees, in a separate action after judgment against the uninsured motorist.
The bad-faith framework creates settlement leverage for the plaintiff. A UIM insurer aware of bad-faith exposure typically responds to clear claims more quickly than to claims where bad-faith exposure is weak.
UIM in the layered recovery framework #
UIM is the most important coverage type for serious-injury plaintiffs in Georgia. The math drives the importance. The statutory liability minimum is $25,000, and serious injuries routinely produce damages that exceed it many times over. Without UIM on the plaintiff’s own policy, the gap is borne by the plaintiff. The add-on form provides materially better protection than reduced-by, which makes the 2008 default change significant for policies issued or renewed after 2009. The procedural rules around consent-to-settle, notice, and cooperation matter at every stage of the claim. For Georgia drivers thinking about coverage decisions, UIM is typically the highest-leverage coverage type relative to its cost, and adequate UIM limits are often the difference between recovery and gap.
Disclaimer #
This article is published for educational and informational purposes only. It is not legal advice and does not create an attorney-client relationship between any reader and the publisher, the author, or any law firm. Personal injury law in Georgia is fact-specific, and the rules summarized here can change through new legislation, regulatory updates, and court decisions after this article’s publication date. Statutes, case citations, and procedural rules referenced in this article are summarized for general understanding; readers should consult the current official text of any law cited and should not rely on this article for the resolution of a specific legal question.
If you have suffered an injury in Georgia and want to understand how the law applies to your situation, consult a licensed Georgia personal injury attorney. An attorney can review the facts of your case, identify the deadlines and procedural requirements that apply to you, and advise you on your options under current Georgia law.
Nothing in this article should be read as a guarantee of any particular outcome, a recommendation about whether to settle or pursue litigation in any specific case, or a substitute for personalized legal counsel.