How to Appeal Property Taxes in Allegheny County, Pennsylvania (2026 Guide)

The 2026 Allegheny County annual appeal window is open now for tax year 2027: file between July 1, 2026 and September 1, 2026. File online from the county Real Estate Portal’s “Appeal Status” tab, or submit the county Annual Appeal Form to the Office of Property Assessments; there is no county filing fee for an annual appeal. (alleghenycounty.us)

How assessments work in Allegheny County

Allegheny County is not on an annual market reassessment system. It uses a base-year system: the current base year is 2012, with an effective value date of January 1, 2012, and the county says that base year has been used for tax year 2013 and every tax year since. The last countywide reassessment was in 2013. (alleghenycounty.us)

That means the value you see on the Real Estate Portal is usually not what the county thinks your house would sell for today. It is the county’s base-year value, adjusted only for things such as omissions, math or clerical errors, physical changes like demolitions or building permits, subdivisions, interim assessments requested by a municipality or school district, or catastrophic loss. (alleghenycounty.us)

Beginning with tax year 2026, Allegheny’s annual appeals are prospective: you appeal in the year before the tax year at issue. So in 2026, you are filing an annual appeal for tax year 2027, not to reopen your 2026 bill. The Board rules state that the Assessment Appeal Form is used to challenge the county’s certified assessed value for a particular year, while the Special Appeal Form is used for interim assessments, notices of assessment change, and exemption or abatement determinations. (alleghenycounty.us)

A key 2027 number is the Common Level Ratio (CLR). Allegheny County’s Board page states that the 2027 CLR is 49.3%, and that this factor will be applied to current market value in appeals starting in September 2026. The Pennsylvania Department of Revenue explains that CLR factors are based on State Tax Equalization Board sales data. (alleghenycounty.us)

Whether you should appeal

Start with three checks.

1. Check your property record. The county’s FAQ says to make sure OPA has the right property characteristics, and notes that a Property Record Card may contain more detail than the public Real Estate Portal. You can request the PRC for free by emailing landhelp@alleghenycounty.us, or buy a paper copy at the County Office Building copy desk. (alleghenycounty.us)

2. Compare your assessment to supportable value. For a 2027 appeal, you can argue either a base-year value or a current-market-value approach. For market value, the county’s FAQ recommends recent arm’s-length sales, preferably within the last 12 months, of similar properties in your neighborhood and school district, plus photos/estimates for major repairs or a tax-purpose appraisal. (alleghenycounty.us)

3. Understand the risk. BPAAR may increase, decrease, or sustain the assessment based on the evidence. Also, a school district or municipality can participate, and taxing bodies may file appeals. (alleghenycounty.us)

I did not find an official Allegheny County or Pennsylvania page publishing countywide homeowner appeal success rates or median reductions. Treat any advertised “average savings” from private firms cautiously unless they show parcel-level methodology.

Step-by-step how to file

Step 1: Use the right form. For the open 2026 filing window, use the Annual Appeal Form for a 2027 annual appeal. The county’s Annual Appeals page links the form and says the 2027 annual appeal may be filed July 1, 2026 through September 1, 2026. (alleghenycounty.us)

Use the Special Appeal Form only if you are responding to a written OPA determination, such as an Assessment Change Notice, catastrophic loss, Clean and Green, exempt status, Homestead/Farmstead, interim assessment, or LERTA determination. Special appeals generally must be filed within 30 days of the official mail date on the notice and must include the notice or determination letter; there is no filing fee. (alleghenycounty.us)

Step 2: Choose a filing method. Annual appeals may be filed:

• Online: search your parcel in the Allegheny County Real Estate Portal, open the parcel, and use the Appeal Status tab.
• Email: the county’s annual appeal form instructions have used AnnualAppeals@AlleghenyCounty.US for signed/scanned annual appeal applications.
• Mail or hand delivery: Board rules list the filing address as Room 334, Attention: Appeals Manager, County Office Building, 542 Forbes Avenue, Pittsburgh, PA 15219.
• Do not fax an annual appeal; the Annual Appeals page says not to submit by fax. (alleghenycounty.us)

Step 3: Do not send evidence with the appeal form. The Board rules say no evidence is to be included with the form; evidence must be submitted at least 10 days before the hearing. Keep proof of filing—an online confirmation, email receipt, postmark/proof of mailing, or a date-stamped copy. (alleghenycounty.us)

Step 4: If you missed the deadline, know the narrow late-appeal rule. The county’s Late-Filed Appeal form says valid reasons include administrative breakdown by the county, fraud, physical or mental infirmity preventing timely filing, or overseas military service. It specifically says reasons such as buying after the deadline, obtaining a low appraisal after the deadline, misunderstanding the process, being away, or mortgage-company bill handling do not qualify. (alleghenycounty.us)

What happens after

The appeal is heard by the Allegheny County Board of Property Assessment Appeals and Review (BPAAR). The Office of Property Assessments schedules the hearing and sends notice; residential hearing notices must be mailed at least 21 days in advance, and commercial notices at least 30 days in advance. (alleghenycounty.us)

For 2026, Allegheny County says all hearings are by telephone. You must provide a valid phone number at least 5 days before the hearing. If you are not available when called, the appeal is treated as a “Did Not Appear” and considered withdrawn. Hearings typically last about 20 minutes, and no decision is given that day. (alleghenycounty.us)

Your evidence must go to OPA and the opposing parties at least 10 days before the hearing. BPAAR uses relaxed evidence rules and may consider photographs, appraisals, estimates, invoices, and other value evidence, but the county warns that third-party documents may carry less weight if the appraiser or other preparer is not available to testify. (alleghenycounty.us)

After the hearing, BPAAR reviews the evidence and any recommendations before issuing a decision. You can track the disposition on the Real Estate Website under the parcel’s Appeals tab, and the county will notify you in writing. If you disagree, you have 30 days from the BPAAR disposition letter’s mailing date to appeal to the Court of Common Pleas, Board of Viewers; the county lists a $135.25 non-refundable filing fee for that next-level appeal. (alleghenycounty.us)

Local tips

Use the CLR math before you file. Suppose your 2027 county assessed value is $160,000, but you can prove a current market value of $250,000. Applying Allegheny’s 2027 CLR of 49.3% gives a target assessed value of $123,250 ($250,000 × 0.493). That is a $36,750 assessment reduction.

Using Allegheny County’s actual county tax rate of 6.43 mills—$6.43 per $1,000 of assessed value—that reduction would save about $236.30 per year in county tax alone ($36,750 ÷ 1,000 × $6.43). Your total savings could be larger because school district and municipal taxes are separate; multiply the same assessment reduction by your combined school, municipal, and county millage to estimate the full annual effect. The county’s Homestead page confirms the 6.43 county rate and shows how millage is applied to assessed value. (alleghenycounty.us)

Check exemptions before or alongside an appeal. Allegheny’s Act 50 Homestead/Farmstead exclusion is for primary residences and reduces assessed value by $18,000 for county tax purposes only, worth $115.74 at the 6.43 county millage. The application deadline is March 1 for the exclusion to apply for the current and future tax years; once approved, you generally do not refile unless your ownership or primary residence changes. (alleghenycounty.us)

Also check Act 77 Senior Citizen Tax Relief if you are at least 60, have annual income of $30,000 or less, and have lived in and owned the current Allegheny County residence for at least 10 years; the county describes the benefit as a 30% reduction in the county tax bill. Other local programs include Clean and Green, LERTA in participating areas, residential visitability credits, catastrophic loss relief, and certain nonprofit/government/disabled-veteran exemptions. (alleghenycounty.us)