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Pennsylvania Property Tax Updates

UPDATED december 2025

PA Lawsuit Seeking to Declare Base-Year Assessment System Unconstitutional

A lawsuit in Pennsylvania’s Commonwealth Court’s original jurisdiction from Petitioners Mon Valley Unemployed Committee Inc. seeks to declare Pennsylvania’s Base-Year Assessment System Unconstitutional. Mon Valley through their attorneys from the Community Justice Project are challenging the base-year system in Pennsylvania related to high coefficient of dispersion (COD) rates. They state that the COD in the majority of Pennsylvania counties is above 20% in 2024 indicating high rates of variation in property assessments. In their arguments they include the fact that under Pennsylvania’s base-year system some counties have not performed county-wide reassessments since the late 1960s.  

The petitioners charge two counts as to the current system’s unconstitutionality. Count I argues that the General Assembly under Article II, § 1 of the PA Constitution, unconstitutionally delegated their powers to Counties by failing to provide guidance on using a base-year versus current year assessment system, and by failing to set standards for counties to implement their property tax responsibilities. For Count II Petitioner’s argue that the base-year system establishes an unauthorized tax exemption under Article VIII § 2 and § 5 of the PA Constitution. Petitioners argue this unconstitutional tax exemption exists as irregular countywide assessments have de facto exempted property appreciation from taxation. These arguments both seek to eliminate the base-year system of property tax assessments in Pennsylvania.

Recently the Petitioners filed an amended complaint on December 23rd, 2025, removing the Governor and Attorney General of Pennsylvania as respondents and adding the General Assembly as a party to the lawsuit. Originally, the Petition from Mon Valley was filed in July 2025 against the Governor and Attorney General of Pennsylvania. The Respondents filed Preliminary Objections in September 2025 with an additional brief in Support of Preliminary Objections filed on November 24th, 2025. These Preliminary Objections challenged the organizational standing to file the suit, whether the petition claims a non-justiciable question, whether the parties are mis-joined in the suit, and that the petitioner failed to state a claim under Count I and II. It will be interesting to see how the court responds to the argument that the base-year system and its failure to account for property appreciation results in a property being exempt from taxation when the underlying property is still taxed.

By filing the amended complaint, the Petitioner sought to correct the joinder of the Governor and Attorney General as they are not involved in the Executive or Legislative Functions of property tax administration in Pennsylvania. However, the other claims from the Preliminary Objections will still need to be addressed if brought up by the General Assembly in further litigation. The only other change in the Amended Petition is the removal of Petitioner’s request for injunctive relief which had requested the Defendants to direct counties to assess properties. Now the petition merely asks the Court to declare the base-year system unconstitutional and to grant such additional relief as is just and proper.

Now that the General Assembly has been added as a party it is likely they will file a response and preliminary objections similar to those made previously by the Attorney General. One of those objections could be that the General Assembly is not the correct party to this litigation and instead the Defendants should be the 67 individual counties of Pennsylvania. Depending on their response and subsequent filings, this case could take a while to meet its resolution at the Commonwealth Court. Whether this case resolves before legislative change occurs will depend on the willingness of PA’s General Assembly to address this matter. However there have been talks of legislation to eliminate the base-year system and replace it with regular county-wide reassessments. In the end, it is too early to determine the willingness of the Court to accept these novel arguments of unconstitutionality, and we will be watching for the General Assembly’s response to being added as a party.

Connor R. Baumle, Esquire
Siegel Jennings, Co., L.P.A.

American Property Tax Counsel (APTC)

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