Allegheny County, PA — Property Tax Underwriting Guide
Pennsylvania · Cyclical hold until revaluation
What this means for multifamily underwriting
Allegheny County (Pittsburgh) uses a base-year method that can produce significant divergence between assessed value and current market value. Base-year stability keeps taxes predictable post-acquisition.
Transaction type breakdown
Allegheny County uses a base-year assessment model. A sale does not automatically trigger a reassessment — the assessed value stays at the base-year level until a formal county-wide reassessment is ordered or an individual appeal is filed.
Refinance has no effect on assessed value.
Ownership transfer does not trigger a reassessment to current market value.
Tax appeal information
16.0 mill (1.6% effective on assessed value) is a rough estimate. Allegheny County has a complex multi-layered rate that varies sharply by municipality.
Guide review
County guidance last reviewed: June 15, 2026
Tax-rate scope: Tax-rate scope is not established as parcel-specific; confirm the parcel's taxing-authority stack.
Official sources: Allegheny County Assessments
Base-year model is well documented for Allegheny; effective rate is a county-level estimate.
Parclio estimates are underwriting guidance, not legal or tax advice. Always verify millage rates, the seller's assessed value, and appeal deadlines with the county assessor or local counsel before relying on these numbers for a credit decision.
Run a tax reset estimate for Allegheny County
Use Parclio's estimator to model the post-closing tax bill, NOI impact, DSCR change, and underwriting memo language for your next Allegheny County deal.