Allegheny County Property Tax Appeal Guide
In Allegheny County, file your appeal by Annual appeals are filed the year BEFORE the tax year and the deadline is set county-by-county. Under state law the default is on or before September 1, but the county commissioners may designate an earlier date no earlier than August 1; in practice most counties use August 1 or September 1. Allegheny County's window is July 1 through September 1, and Philadelphia's deadline is the first Monday in October. Confirm the exact date with your county Board of Assessment Appeals each year. at Allegheny County Office of Property Assessments's online portal.
| Deadline | Annual appeals are filed the year BEFORE the tax year and the deadline is set county-by-county. Under state law the default is on or before September 1, but the county commissioners may designate an earlier date no earlier than August 1; in practice most counties use August 1 or September 1. Allegheny County's window is July 1 through September 1, and Philadelphia's deadline is the first Monday in October. Confirm the exact date with your county Board of Assessment Appeals each year. |
|---|---|
| Lien date | January 1, 2026 |
| Appeal body | County Board of Assessment Appeals (Board of Assessment Appeals) |
| Assessor / district | Allegheny County Office of Property Assessments |
| Online portal | File online |
How to File a Appeal in Allegheny County
- Gather your assessment notice — it lists your account number and any access code
- File online through Allegheny County Office of Property Assessments's portal or by mail
- State your grounds and submit evidence (comparable sales, a licensed appraisal, or photos of defects)
- Request an informal review to try to settle before a formal Board of Assessment Appeals hearing