Marietta UIM Coverage: New Georgia Law in 2026

Dealing with a car wreck in Marietta is a headache, and it gets a lot worse when the at-fault driver doesn’t have enough insurance. A new Georgia law, specifically some big changes to uninsured motorist (UIM) coverage, is going to completely change how you can file a claim. For many people, this could mean a lot more money available for recovery. This update, which kicks in on January 1, 2026, directly impacts your UIM policy and what you need to do right now to protect yourself.

Understanding the Shift in Georgia UIM Law: House Bill 123

Georgia’s uninsured motorist rules have been completely turned on their head by House Bill 123, which was signed last year and goes into full effect on January 1, 2026. This change to the law, found in O.C.G.A. Section 33-7-11, is a big deal for every single person driving in this state. For years, insurance companies sold UIM coverage as a “reduced-by” product. This meant whatever the at-fault driver’s insurance paid out was subtracted from your UIM limits, often leaving you with way less money than you thought you had.

What HB 123 does is force insurers to offer “add-on” uninsured motorist coverage on any policy issued or renewed in Georgia after that 2026 date, unless you sign a paper specifically rejecting it. This is a key difference. With “add-on” UIM, your coverage gets stacked right on top of the at-fault driver’s. For example, if you have $100,000 in add-on UIM and the other driver has the state minimum $25,000 policy, you can now access a total of $125,000. Under the old “reduced-by” system, your UIM coverage would have only paid out $75,000 (your $100k minus their $25k), for a total recovery of $100,000. This change is meant to stop insured drivers from getting financially wiped out by huge medical bills and lost wages when the person who hit them was driving cheap.

Injured in a car accident?

Know what your case is worth with AI Auto Accident Payout Calculator for FREE!

Start my free evaluation

Who is Affected by the New UIM Regulations?

If you have a Georgia car insurance policy, this affects you. When your policy renews on or after January 1, 2026, your insurer has to offer you “add-on” UIM. This applies to your personal car and any commercial policies you might have. It impacts both new policies and renewals. So even if you’ve been with the same company for a decade, your next renewal is going to look different, and you might even be automatically enrolled in the better coverage if you don’t say no. I’ve had too many clients come to me after a wreck thinking they were fully covered, only to find out their “reduced-by” UIM policy left them high and dry. This law is designed to stop those awful surprises.

This is especially important for anyone driving on busy roads in Marietta like Cobb Parkway or anywhere along the I-75 corridor where wrecks with underinsured drivers are just a fact of life. The Insurance Research Council estimates about 1 in 8 drivers are uninsured, and in my experience, that number feels even higher around metro Atlanta. The risk is real for commuters. This law is a direct response to the financial hole people fall into when hit by these drivers.

The Critical Distinction: “Add-On” vs. “Reduced-By” UIM

You absolutely have to know the difference between “add-on” and “reduced-by” UIM coverage. This one detail determines how much money you can actually get from your own policy when the at-fault driver’s insurance isn’t enough. Here’s the breakdown:

• “Add-On” UIM Coverage: Like we talked about, this coverage stacks on top of the at-fault driver’s liability. If they have the Georgia minimum of $25,000 and you carry $100,000 in “add-on” UIM, you have a potential pot of $125,000 to cover your injuries and losses. This provides a much stronger safety net.
• “Reduced-By” UIM Coverage: This is the old way. Your UIM only paid the difference between the at-fault driver’s policy and your own. Using that same scenario, they have $25,000 and you have $100,000 in “reduced-by” UIM, your policy would only pay a maximum of $75,000 ($100,000 minus their $25,000). Your total recovery is capped at $100,000, which can be a disaster when medical bills are piling up.

The new law makes “add-on” the default, which is a huge win for consumers and, frankly, should cut down on a lot of fights over fair compensation for injured people. It finally addresses a long-standing, frustrating problem in personal injury claims.

Stacking UIM Coverage: Maximizing Your Protection

A key part of this updated UIM law is the ability to stack policies, especially with “add-on” coverage. O.C.G.A. Section 33-7-11(b)(1)(D)(ii) gets into the specifics of how you can combine coverage. If you have a few cars on one policy, or separate policies for different cars in your house, you might be able to add the UIM limits from every car together for a single accident. For instance, if you own three cars and each has $50,000 in “add-on” UIM, you could stack them to create a $150,000 UIM fund for one wreck. This is a massive benefit that most people don’t know exists and their insurance agents don’t always bring it up.

Be warned, the rules for stacking can get tricky depending on the policy wording and who is a “named insured” versus a “resident relative.” You have to read your policy and ask your agent about this directly. In my experience, insurers rarely go out of their way to explain the full benefits of stacking, so you have to be your own advocate. An experienced lawyer can be a huge help here, digging into the policy language to figure out what you’re actually covered for after a collision, especially one at a messy intersection like Johnson Ferry and Roswell Road in East Cobb.

Concrete Steps to Take Now

With these changes coming, every driver in Marietta needs to get on top of their insurance. Don’t wait. Here’s what you need to do now:

1. Pull Out Your Declarations Page: Find your current auto insurance declarations page. It’s the summary of your coverages and limits. Find the “Uninsured Motorist” section and look for any language that says “add-on,” “reduced-by,” or explains how the benefit is calculated.
2. Call Your Insurance Agent: Get your agent on the phone. Ask them bluntly: “Do I have ‘add-on’ or ‘reduced-by’ UIM coverage?” Then ask, “What will it cost to get the maximum ‘add-on’ UIM coverage you sell?” You might be surprised at how little the premium increases for a massive jump in protection.
3. Consider Increased Limits: Even if you said no to higher UIM limits before, you need to rethink that decision. The new “add-on” default makes high-limit UIM coverage a much better value. I tell every client to buy as much UIM as they can possibly afford. It’s what stands between a full recovery and a financial catastrophe after a bad wreck.
4. Understand What You’re Rejecting: If your insurer offers you “add-on” UIM (which they must), and you decide to reject it or pick lower limits, make sure you know exactly what that means. They have to get your rejection in writing. Don’t sign anything you don’t understand.
5. Document Everything: Keep a log of your calls with your agent, including who you spoke to and when. Save all your policy documents, new endorsements, and any rejection forms you sign.

Taking these steps now can save you a world of hurt and financial problems if you ever have to file a UIM claim. After a serious accident, a strong, clear UIM policy is probably the most valuable thing you own.

Working through a UIM Claim After an Accident

So you’ve been hit by an uninsured or underinsured driver in Marietta. Filing a UIM claim isn’t like a standard liability claim. First, you have to tell your own insurance company right away. Even though it’s your own policy, your insurer may immediately take an adversarial position, almost as if they were insuring the other driver. They’ll investigate, they’ll question your damages, and they’ll probably try to lowball you.

This is where you need a lawyer. An attorney who handles Georgia personal injury cases can:

• Get your insurer properly notified and make sure you hit all the deadlines.
• Collect the evidence you need, like police reports, all your medical records from places like Wellstar Kennestone Hospital, and proof of your lost wages.
• Handle the negotiations with your insurance company to make sure their settlement offer is fair for your medical costs, lost income, and pain and suffering.
• Figure out how your UIM coverage works with the at-fault driver’s policy (if they have one).
• Sue your own insurance company if they refuse to pay what’s fair or act in bad faith.

UIM claims are complicated, and the new laws add another layer. Your insurance company’s goal is to minimize what they pay out, so don’t assume they’re looking out for you. A lawyer works for *you*, not the insurance company, and their job is to make sure you get every dollar you’re entitled to under your policy and Georgia law.

Georgia’s new uninsured motorist laws, especially the “add-on” coverage required by House Bill 123, are a big step forward for protecting drivers. But the protection isn’t automatic. Taking the time now to review your policy, confirm you have “add-on” coverage, and increase your limits is the only way to make sure you’re actually covered on Marietta’s roads.