How Much Can I Get From an Underinsured Motorist Claim in MA?

You’ve been in an accident, and the other driver’s insurance paid its limit, and your bills are still coming in. Now you’re wondering what your own policy will pay. In Massachusetts, that answer starts with your underinsured motorist coverage, if you added it to your policy. We’ll walk through how the UIM coverage math actually works.

Key Takeaways

• Your UIM limit is a ceiling, not a payout. In Massachusetts, underinsured coverage pays only to the extent your limit is higher than the at-fault driver’s limit. What you may actually receive depends on your provable damages.
• UM is required on every policy; UIM is optional. Every Massachusetts auto policy includes uninsured motorist coverage, at least 25/50 on policies written or renewed since July 2025. Underinsured coverage only applies if you added it.
• You can’t stack policies, but a relative’s policy may help. Massachusetts doesn’t let you add limits together. If you live with a relative, though, the household policy with the highest limits may apply.

What Is Uninsured Motorist Coverage, and What Does UIM Pay For?

Underinsured motorist coverage (UIM) protects you when the driver who hurt you has insurance, but not enough of it. Their policy pays its limit, and UIM may step in for the rest of your losses, up to your own limit. In Massachusetts, under M.G.L. c. 175, § 113L, UIM is optional. It only applies if you added it to your policy.

What Does UIM Cover

A lot of people think UIM only pays medical bills. That’s a myth we hear all the time, and it can cost you. UIM pays the damages you’d be “legally entitled to recover” from the at-fault driver if they had enough coverage. In other words, you can bring the same kind of injury claim, just against your own insurer. Depending on your case, that may include:

• Medical bills, once PIP has paid its share, plus future treatment
• Lost wages and lost ability to earn
• Pain and suffering, including physical pain, lost sleep, anxiety, and the parts of daily life you missed

Pain and suffering usually requires your injuries to meet Massachusetts’ tort threshold. That means more than $2,000 in reasonable medical expenses, or certain serious injuries such as a fracture or permanent disfigurement. Your insurer will also subtract what other sources have already paid, and we’ll walk through that math shortly. First, it helps to know where UIM stops.

What UIM Doesn’t Cover

UIM covers injuries, not your car. In Massachusetts, uninsured and underinsured coverage pays only for bodily injury. Underinsured motorist coverage does not cover:

• Car repairs: Collision coverage pays no matter who was at fault. Limited Collision pays only if you were no more than 50% at fault and the other driver can be identified.
• Your deductible: Under the standard Massachusetts policy, your collision deductible usually still applies, even when the other driver caused the crash.
• Rental car: This is covered only if you bought Substitute Transportation coverage. That coverage has daily limits and ends shortly after a total-loss offer.

So your repairs, rental car, and deductible have to come from other parts of your policy.

This is a common frustration we hear from clients. Your injury claim and your car claim run on separate tracks. Look at your coverage selections page to see what you actually have. Now that you know what UIM can and can’t pay for, let’s look at how it lines up against the uninsured coverage every Massachusetts driver already carries.

UM vs. UIM in Massachusetts: What’s the Difference?

It comes down to one question: did the driver who hurt you have insurance?

• If they had none, or it was a hit-and-run accident, that’s uninsured motorist coverage (UM).
• If they had some but not enough, that’s underinsured motorist coverage (UIM).

Both cover your injuries. They just kick in at different times.

1. UM Is Required on Every Policy
   You can’t drive in Massachusetts without UM. It may cover you in your own car, in someone else’s car, or as a pedestrian, and it can cover your passengers and household members too. A driver can also count as “uninsured” if their insurer denies coverage or goes insolvent. So if you got a denial letter, bring it to your own insurer.
2. UIM Is Optional but Often Makes the Difference
   Plenty of drivers carry only the state minimum, and that can run out fast after a serious injury. UIM may pick up where their coverage stops. The catch is that UIM only applies when the other driver’s limits are lower than your UIM limit. So check the actual number on your coverage selections page.

Now you know which coverage fits your situation. Next is the question that brought you here: how much can it actually pay? Let’s work through the math.

The Underinsured Coverage Math, Step by Step

This is where most people get lost, and it’s usually where the frustration starts. You see a big number on your policy and expect that amount. Then your insurer offers far less. Let’s walk through how the number actually gets built. We’ll use a simple example. It’s hypothetical, so your own case may look very different.

Step 1: Start With the At-Fault Driver’s Limit

The other driver’s bodily injury coverage pays first. Let’s say they carried $25,000 per person and their insurer paid it all. That $25,000 is your starting point. Your UIM claim only covers what’s left after that.

Step 2: Find Your UIM Limit on Your Coverage Selections Page

In Massachusetts, your policy summary is called the Coverage Selections Page. Most people call it the declarations page. Find the underinsured line. You’ll usually see two numbers, like $100,000/$300,000. The first is the most your policy pays for one injured person. The second is the most it pays for everyone injured in the same crash combined. If you were the only one hurt, the first number is the one that matters.

Step 3: Subtract (the Massachusetts Offset)

This is the step that catches people off guard. In Massachusetts, what you collect from the at-fault driver’s policy comes off your UIM limit. So in our example: $100,000 UIM limit − $25,000 already paid = up to $75,000 potentially available. That $75,000 is a ceiling. It’s not a promise.

Step 4: Compare It to Your Real Damages

Your insurer pays only what your documented losses support, up to that ceiling. Say your medical bills, lost wages, and pain and suffering add up to $90,000. Subtract the $25,000 you already got, and $65,000 remains. That’s under the $75,000 ceiling, so $65,000 is what your UIM claim may be worth. If your losses came to $150,000, the ceiling would cap you at $75,000. PIP, workers’ comp, and your share of fault can lower the number further. We’ll cover those next.

Why You Can’t Stack Policies in Massachusetts

Got two cars on your policy, or two policies in your house? It’s natural to think you can add the UIM limits together. In Massachusetts, you can’t. The law says limits “shall not be added together, combined or stacked,” no matter how many vehicles or policies you have. You get one limit from one policy.

The law also decides which single policy applies. For most people, it’s their own. But if you don’t have your own auto policy, the answer may be a relative’s policy. That’s where the household member rule comes in.

The Household Member Rule: A Relative’s Policy May Cover You

If you don’t have your own auto policy, you may still have UIM coverage through a relative you live with. Under Massachusetts law, you recover from the household policy with the highest limits. That can help an adult child living at home, or someone hit while walking or biking. If you have your own policy, the rules usually point back to it. So before you assume there’s no coverage, check what your household carries.

Even with the right policy, a few things can shrink your payment. Let’s look at those next.

What Can Reduce Your UIM Payment?

Most low offers have a reason behind them, even when nobody explains it to you. Here are the most common ones, so you’re not caught off guard.

PIP Payments

PIP pays up to $8,000 for medical bills and lost wages, no matter who caused the crash under Massachusetts no-fault system. Your UIM claim won’t pay those same costs a second time. So whatever PIP covered usually gets subtracted from your UIM damages.

Workers’ Comp, If You Were Hurt on the Job

If you were driving for work, workers’ comp may cover your wages and medical care. The standard Massachusetts policy lets your UIM insurer reduce your claim by what workers’ comp paid. Workers’ comp may also have a right to be repaid from your recovery. With both in play, this math gets tricky fast.

Your Share of Fault

Massachusetts uses modified comparative negligence. If you were partly at fault, your damages drop by your percentage. If you were more at fault than the other driver, you may not recover at all. Expect insurers to look hard for any reason to put some of the blame on you.

Gaps in Treatment and Thin Records

Insurers pay for what’s documented. A missed appointment, a long gap between visits, or pain you never mentioned to your doctor can all be used to argue your injuries weren’t that serious. Keep your appointments. Tell your providers everything. Save every bill and note.

Put all of this together, and you can see why two crashes that look alike can end very differently. It’s also why there’s no reliable “average” UIM settlement.

Why There’s No “Average” UIM Settlement

We get asked this all the time, and our honest answer is that a reliable average doesn’t exist. Every UIM claim depends on two policies, your injuries, how you’ve healed, and how well it’s all documented. So a number that fits someone else’s case tells you very little about yours. What you can control is how you handle your UIM claim from day one, so let’s go through how to file without hurting it.

How to File a UIM Claim Without Hurting It

An underinsured motorist claim has an order to it. Get the steps out of order, and you can give your insurer an easy reason to pay less, or nothing at all. Here’s the sequence we walk our clients through.

1. Get Care and Keep Records
   See a doctor right away, even if you think you’re “just sore.” Then keep a simple file: medical bills, pay stubs that show missed work, receipts, and a few notes about how the injury affects your day.
2. Tell Your Insurer Early
   Don’t wait until the other driver’s insurer pays. The standard Massachusetts policy says your insurer “must be notified promptly.” Late notice may mean they don’t have to pay your UIM claim. So call your own insurer, open the claim, and get the claim number in writing.
3. Don’t Sign the Other Driver’s Release Before Your Insurer Consents
   This is the mistake we see hurt people the most. The other driver’s insurer offers their full limit. You’re tired, and you sign it. Then your own insurer says you settled without its consent. Under the standard policy, your insurer pays UIM only if the claim “was settled with our consent,” though it can’t “unreasonably withhold” that consent. Before you sign anything, ask your insurer in writing for consent to settle, and wait for the answer.
4. Collect the At-Fault Driver’s Coverage First
   UIM pays on top of what the other driver’s policy pays. So that money usually needs to be collected first, with your insurer’s sign-off. Once it is, your UIM claim can move forward.
5. Send Your Demand and Negotiate
   Next, you send your insurer a demand package. It lays out your injuries, treatment, lost income, and how the crash changed your life, with records to back it up. Expect them to review it closely. They may ask for a recorded statement, an examination under oath, or a medical exam with a doctor they choose. You have a duty to cooperate. If you can’t agree on a number, the policy sends the dispute to arbitration.
6. Watch the Deadline
   Time limits apply, and they’re easy to miss. An injury lawsuit against the at-fault driver generally has to be filed within three years. Your UIM claim against your own insurer may run on a different clock, depending on the facts. Don’t count on having more time. Start early.

Even when you follow every step, UIM claims don’t always go smoothly. Some of the hardest moments come from your own insurer.

Common Challenges in Massachusetts UIM Claims

You’ve paid your premiums for years, and now your own insurer is acting like the other side. In a UIM claim, that’s often how it works. Your insurer steps into the at-fault driver’s shoes and looks for reasons to pay less.

• When Your Insurer Questions Your Injuries
  Your insurer may blame an old injury, call the crash “too minor,” or question your treatment. A pre-existing condition doesn’t end your claim, though. If the crash made it worse, that harm can still count. Clear medical records that tie your symptoms to the crash help most.
• When the Offer Comes in Low
  Low first offers are common. Massachusetts law expects insurers to give “a reasonable explanation” for their offer. So ask, in writing, how they reached that number.
• When Your Claim Stalls
  Massachusetts treats some delays as unfair, such as failing to settle once liability is “reasonably clear”. In that case, you can send a written demand, and the insurer has 30 days to respond. But not every delay qualifies. It depends on the facts.
• When You Can’t Agree on Fault or Value
  If you and your insurer can’t agree, the standard policy sends the dispute to arbitration. It’s less formal than court, but preparation still shapes the result.

Do You Need a Lawyer for a UIM Claim?

Not always, and we’ll be the first to tell you that. If your injuries were minor and the insurer offered close to your remaining limit, a lawyer may not change much. But many UIM claims aren’t that simple. A review can make sense when:

• Your injuries are serious or still being treated
• PIP, workers’ comp, or health insurance liens are involved
• More than one policy might apply, such as a relative’s household policy
• Fault is disputed
• You’re being pressured to sign a release
• Your claim has stalled, or the offer doesn’t add up

In these cases, a lawyer can check the math, deal with your insurer, and keep the deadlines from slipping while you focus on getting better.

The Bottom Line on Your Massachusetts UIM Claim

Your UIM limit sets the ceiling. Your documented losses and the Massachusetts offset decide where you actually land. The steps you take early, like giving notice, getting consent before you settle, and keeping records, can protect that number. And if your own insurer pushes back, Massachusetts law gives you tools to push back too.

If the other driver’s coverage ran out and you’re not sure what your own policy should pay, call us. We’ll go through your coverage selections page, the other driver’s limits, and the numbers with you, in plain language. The consultation is free, with no obligation.

Our Stone Cold Guarantee is our collection of promises to you, so you know what to expect when you work with us. We’ll return your call within 24 hours, meet face-to-face within 24 hours of your request, and give you an update on your case every two weeks. And we only get paid after you get paid. We are available to help clients from our offices in Boston, Fall River, Natick, Norwood, Peabody, and Plymouth.