Stacked vs. Unstacked Coverage in Pennsylvania: What It Means When You’re Hurt
If you're seriously hurt by a driver who has little or no insurance, one line on your own auto policy can make a big difference: whether your coverage is stacked or unstacked. Most people never think about it until after a crash. Here's what it means in Pennsylvania and why it matters.
First, what coverage are we talking about?
Stacking applies to two coverages on your own policy: uninsured motorist (UM) coverage, which pays when the at-fault driver has no insurance or flees the scene, and underinsured motorist (UIM) coverage, which pays when the at-fault driver's insurance isn't enough to cover your losses. See What If the Other Driver Was Uninsured or Underinsured?
What "stacking" means
Stacking lets you add together the UM or UIM limits for each vehicle you insure. For example, if you have two cars on your policy, each with $100,000 in UIM coverage:
Stacked: up to $200,000 may be available to you ($100,000 × 2 vehicles).
Unstacked: you're generally limited to $100,000, no matter how many vehicles you insure.
Stacking can also work across separate policies in the same household, for example a car policy and a motorcycle policy. Whether that's available depends on the policies and how they were written.
Stacking is the default in Pennsylvania
Under Pennsylvania's Motor Vehicle Financial Responsibility Law, stacked UM and UIM coverage is the default. An insurer can only sell you unstacked coverage if you sign a specific waiver form whose wording is set by statute. Stacked coverage costs more, which is why many people sign the waiver when they buy a policy, often without realizing what they gave up.
If there's no valid signed waiver, or the form doesn't follow the law's requirements, stacked coverage may apply even if the declarations page says otherwise. That's one reason it's worth having someone review the actual paperwork, not just the summary.
The "household vehicle exclusion"
Some policies included a clause that denied UM/UIM coverage if you were hurt in a household vehicle that wasn't insured on that same policy. In 2019, the Pennsylvania Supreme Court ruled in Gallagher v. GEICO that this kind of exclusion could not be used to take away stacked coverage that a policyholder paid for and never waived. Courts have applied that decision differently depending on the facts since then, so the details of your policies matter.
Why this matters after a serious crash
In Northeastern Pennsylvania, many drivers carry only the state minimum of $15,000 in bodily injury liability coverage. If a serious injury leads to months of treatment and missed work, that amount can be used up quickly. Your own UIM coverage, and whether it stacks, may decide how much is actually available. See Lost Wages After an Accident and How Pain and Suffering Is Valued.
Stacking and your tort option
Stacking and tort selection are separate choices on your policy. Your tort option affects whether you can recover for pain and suffering; stacking affects how much UM/UIM coverage is available. See Limited Tort vs. Full Tort in Pennsylvania.
A UM/UIM claim is still a claim against an insurance company
Even though it's your own insurer, a UM or UIM claim works like a claim against the other side. Your insurer will evaluate the claim, may ask for a recorded statement, and may request broad medical authorizations. See Do I Have to Give a Recorded Statement to My Own Insurance Company? and The Adjuster Sent a Medical Records Authorization. If your insurer drags its feet, see Bad Faith in Pennsylvania.
What you can do now
Pull your declarations page and look for the words "stacked" or "unstacked" next to your UM and UIM coverage.
If you're shopping for a policy, ask your agent to price stacked coverage and higher UM/UIM limits before deciding.
If you've already been hurt, don't assume your coverage is unstacked just because the paperwork says so. The waiver itself matters.
Not sure what your policy really covers? The attorneys at Joyce, Carmody & Moran can review your policy and explain what may be available to you. Request a free consultation.
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