Allegheny County, Pennsylvania property-tax payment and appeal deadlines
Tax bills, payment rules, and valuation-review windows are controlled by the local jurisdiction and the governing state framework. The reviewed record below separates published figures from items that still require confirmation with Allegheny County Office of Property Assessments and Treasurer's Office.
Rate context
Confirmcounty millage is published, but no single countywide effective rate applies across municipal and school districts.
Statement mailing
PublishedJanuary 2026; the Treasurer's 2026 calendar states the Treasurer's Office mails tax statements in January.
Payment deadline
Published2026 county real-estate tax: 2% discount period ends March 31, 2026; gross/face payment period ends April 30, 2026; delinquent period begins May 1, 2026 with a one-time 5% penalty and 1% monthly interest.
Valuation protest
PublishedFor tax year 2026, the annual assessment appeal window was July 1, 2025 through September 2, 2025. The 2027 annual window is July 1, 2026 through September 1, 2026 under County Ordinance 06-24-OR.
Do not assume a grace period.
The reviewed record identifies the payment timing above but does not establish a universal penalty schedule for this page. Late charges, interest, collection costs, tax-sale procedures, and lien or foreclosure timelines can depend on state law and the local collector’s process. If the deadline is close or a balance is delinquent, contact the tax collector directly and request the current payoff amount in writing.
Treat a published payment deadline as a hard operational date and retain your receipt or confirmation number.
From assessment to collection
01Valuation and notice
Review the assessment notice as soon as it arrives. The protest window may run from the notice date rather than from the payment due date.
02Statement and account review
Match the tax statement to the parcel or account number and confirm exemptions, assessed value, taxing units, credits, and balance.
03Payment confirmation
Use the official collector channel, then save the receipt, transaction reference, and date posted. A bank submission is not always the same as a county posting date.