Allegheny County is no longer going to be the oddball Pennsylvania county when it comes to its annual assessment appeal deadline. On June 4, 2024, Allegheny County amended its Ordinance regarding annual assessment appeal deadlines so that for the 2025 tax year all annual assessment appeals shall be filed by October 1, 2024. Additionally, for years after 2025, the annual assessment appeal deadline changes to September 1. These are significant changes that need to be adhered to in order to timely file going forward.

Historically, Allegheny County, with an annual assessment appeal deadline of March 31, was the only county in Pennsylvania (1 of 67) where you appealed your assessed value the year it was already effective. Hence Allegheny County and all of its taxing jurisdictions could never budget accordingly. Whereas every other county in Pennsylvania had annual assessment appeal deadlines of August 1, August 15, August 31, September 1, or the first Monday in October, which were well before the assessed values were actually in effect, i.e. January 1.

The common level ratio for Allegheny County for the 2025 tax year is 52.7%, which is down from 54.5% for the 2024 tax year.