Pennsylvania assessment is decentralized at the county level, with appeals heard by each county's Board of Assessment Appeals. Most PA counties operate on a pre-set annual appeal window with August or September deadlines. The state publishes the Common Level Ratio (CLR) each July, which materially affects the math on every appeal. Contingency engagements are common; PA is generally a strong state for over-assessment work because most counties have not reassessed in decades.
Verify before filing. Statutory deadlines change, and many counties operate on their own schedule inside the state framework. Always confirm the current year's window with the assessor or appeal board for the specific jurisdiction before relying on a date.
State-level deadlines plus major sub-jurisdictions where the schedule diverges from the state default. Where a column says "Varies," confirm the date with the local assessor.
| Month | Type | Event | Date | Details |
|---|---|---|---|---|
| July | RP | STEB publishes new Common Level Ratios Statewide (PA) |
Early July (annually) | New CLR factors take effect July 1 for the following tax year. Materially impacts appeal math statewide. |
| August | RP | Annual appeal deadline Most PA counties (statutory default) |
August 1 | Statutory annual appeal deadline for most PA counties. County may set an earlier date by ordinance. |
| September | RP | Annual appeal deadline Allegheny County |
September 1 | Allegheny County (Pittsburgh) statutory annual appeal deadline. |
| October | RP | First Monday in October — appeal deadline Philadelphia |
First Monday in October | Philadelphia (BRT/OPA) annual appeal deadline. Filed with the Board of Revision of Taxes. |
| August | RP | Annual appeal deadline Montgomery County |
August 1 | Annual deadline for filing with the Montgomery County Board of Assessment Appeals. |
| August | RP | Annual appeal deadline Bucks County |
August 1 | Annual deadline for filing with the Bucks County Board of Assessment Appeals. |
| August | RP | Annual appeal deadline Chester County |
August 1 | Annual deadline for filing with the Chester County Board of Assessment Appeals. |
| August | RP | Annual appeal deadline Delaware County |
August 1 | Annual deadline for filing with the Delaware County Board of Assessment Appeals. |
| Varies | RP | Interim / change notice appeal |
40 days from notice | Statewide: appeals from interim/change-of-assessment notices must be filed within 40 days of the notice mail date. |
| January | RP | Value Notices Issued Pittsburgh |
15-Jan | |
| March | RP | Appeal Deadline Pittsburgh |
31-Mar |
RP = Real Property · BPP = Business Personal Property · Both = Applies to both
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