“Stacking” is one of those insurance words nobody explains until you’re hurt and the bills arrive. Two recent Pennsylvania Superior Court decisions — Baluch and Kennedy, both against Erie Insurance — went opposite directions on stacking underinsured motorist coverage, and together they teach a lesson every Pennsylvania household should hear before a crash, not after one.
What Stacking Means, in Plain English
Underinsured motorist coverage — UIM — is the part of your own auto policy that pays when the driver who hurt you doesn’t carry enough insurance to cover your losses. Stacking, under 75 Pa.C.S. § 1738, lets you combine the UIM limits of multiple vehicles or policies you pay for, so the available coverage adds up instead of stopping at one vehicle’s limit.
Stacking isn’t free and it isn’t automatic in every situation. Insurers can require a written waiver of stacking, signed by the policyholder. And insurers have spent years writing policy language that shrinks stacking without ever asking for that signature. That’s what Baluch was about.
Baluch: You Paid for It, You Can Stack It
In Erie Insurance Exchange v. Baluch (Pa. Super., filed January 3, 2025), a passenger was badly hurt in a single-vehicle motorcycle crash. She had paid for stacked UIM coverage on her own policy. The question was whether she could also stack UIM coverage from her parents’ household policy — coverage that, combined, would actually match the seriousness of her injuries.
Erie said no, pointing to its own policy definition: a vehicle insured under that same policy didn’t count as an “underinsured motor vehicle,” which conveniently shut the door. The Superior Court saw through it. The court held that Erie’s definition operated as a disguised waiver of stacking — and a waiver of stacking is only valid under § 1738 if it’s an express written waiver signed by the insured. No signature, no waiver. The passenger could stack.
The principle is bigger than one case: an insurance company can’t take away a protection the legislature gave you by burying the removal in a definition, after charging premiums for the stacked coverage.
Kennedy: The Trap on the Other Side
Now the cautionary half. In Erie Insurance Exchange v. Estate of Kennedy (Pa. Super. 2025), the insureds were killed riding a motorcycle they owned — but the motorcycle was insured with a different carrier, while their Erie policy covered other vehicles. A household exclusion in the Erie policy was used to deny coverage, and this time the Superior Court upheld the denial.
Why the different result? Because stacking adds onto coverage you’re actually receiving. The Kennedys never first received UM/UIM benefits under another policy, so there was nothing to stack onto. The household exclusion stood, and the claim failed. Same insurer, same general subject — opposite outcome, driven by how the household’s insurance was arranged.
What This Means for You
Two practical takeaways. First, after any serious crash, the coverage hunt shouldn’t stop at one policy. Every policy in the household — yours, a spouse’s, parents’ if you live with them — needs to be audited by someone who knows what Baluch protects. People leave money on the table every year because nobody asked whether household coverage could stack.
Second, think twice before insuring a motorcycle or an extra car with a separate carrier to save a few dollars. The Kennedy fact pattern — vehicles split across companies — is exactly where household exclusions bite hardest. Keeping vehicles under one roof isn’t a guarantee of coverage, but splitting them creates a trap that only becomes visible after someone is killed or catastrophically hurt, when it’s too late to rearrange.
Honest caveat: stacking disputes are intensely fact-specific. The policy language, the waivers in the file, and who received benefits first all matter. Neither case promises any particular result — they tell you what questions to ask.
Not Sure What Coverage You Actually Have? Ask Before You Settle
Call the Law Offices of Jason P. Provinzano, LLC at 570-822-5771 for a free consultation at 16 W. Northampton Street in Wilkes-Barre. If you’ve been hurt in a crash, bring your policy declarations pages — we’ll audit your household coverage and tell you whether stacking can increase what you’re entitled to recover.
This article is general information about Pennsylvania personal injury law, not legal advice about your specific situation.
