How to Appeal Property Taxes in Allegheny County

Last updated May 18, 2026

·Independent Pennsylvania tax education

Allegheny County's last full reassessment was effective for the 2013 tax year, with 2012 base-year market values. Combined with the recent court rulings on the Common Level Ratio, that base-year freeze has made Allegheny one of the most active property tax appeal markets in Pennsylvania. The procedure: file by March 31, present to a hearing officer, escalate to BPAAR if needed.

Key takeaways

Allegheny County's last full reassessment was in 2013, with 2012 base-year market values — most assessments are out of sync with current market value.
The annual appeal deadline is March 31. Catastrophic loss appeals follow a separate, narrower path.
BPAAR uses a two-step process: an informal hearing officer first, then a formal BPAAR hearing.
The Common Level Ratio (CLR) — not the county's older Predetermined Ratio — drives implied market value calculations after recent court rulings.
Taxing authorities (school districts, especially) regularly file reverse appeals after a property sells above its assessed value.

Why Allegheny County appeals are different

Allegheny County has not done a county-wide reassessment since 2013, with assessed values pegged to 2012 base-year market data. In a rising real estate market that mismatch shows up two ways: most homes are assessed at less than current market value (good for owners), but homes that just sold for well above the 2012 base value are exposed to reverse appeals from taxing authorities.

The procedural framework is also different from most PA counties. Appeals go to the Board of Property Assessment Appeals and Review (BPAAR), but the first stop is actually a single hearing officer. Only after the hearing-officer stage does the case reach the three-member BPAAR.

The March 31 annual deadline

Annual appeals can be filed by the owner or by any taxing body (county, municipality, or school district). The deadline is firm; late filings are dismissed.

The two-step appeal: hearing officer + BPAAR

Allegheny County's two-step structure is unusual:

Hearing officer. An assigned hearing officer reviews evidence and makes a written recommendation. This is relatively informal — many homeowners present pro se. Sessions are typically 10–15 minutes.
BPAAR formal hearing.If either side disagrees with the hearing officer's recommendation, they can escalate to a formal hearing before the three-member BPAAR. The BPAAR hearing is more formal — counsel is more common, and the taxing authority is often represented.

You cannot skip the hearing-officer step. Filing always starts at Level 1.

PDR vs CLR — the 2022 court rulings

For years, Allegheny County applied a Predetermined Ratio (PDR) higher than the actual ratio of assessments to sales in the county. A 2022 ruling required the county to use the State Tax Equalization Board's published Common Level Ratio (CLR) when it diverged materially from the PDR.

Mathematically, a lower CLR means a higher implied market value for the same assessed value. The shift to the STEB CLR made many Allegheny assessments look high relative to the implied market value the formula now produces — which is why the post-2022 appeal volume jumped.

See our Pennsylvania Common Level Ratio guide for the math and worked examples.

What evidence BPAAR accepts

The same evidence rules as the rest of Pennsylvania apply, with Allegheny-specific emphasis on the CLR calculation:

Three to five recent arm's-length sales of similar properties in the same school district.
The current STEB-published Common Level Ratio for Allegheny County.
Photographs and contractor estimates for condition arguments.
The county property record showing square footage, year built, and lot size for the subject and each comp.

For more on how to assemble a comp packet, see our comparable sales methodology guide.

Reverse appeals by taxing authorities

Allegheny County's major taxing authorities — especially Pittsburgh Public Schools and several suburban school districts — regularly file reverse appeals on recently sold properties whose 2012-base assessment is far below the new sale price. A recorded sale price above the assessment is the simplest evidence the district has for raising the assessment.

If you've recently bought a home in a high-tax Allegheny school district, consider this risk before celebrating a low assessment. Talking with a property tax attorney before closing can be worth the cost on higher-priced transactions.

After BPAAR — Court of Common Pleas

A BPAAR decision can be appealed to the Allegheny County Court of Common Pleas. That step is formal litigation with motion practice, discovery, and usually a Pennsylvania-licensed attorney and a certified property tax appraiser. Most owner-occupied residential appeals stop at BPAAR; commercial and high-value residential appeals more often reach Common Pleas.

Catastrophic loss appeals (separate path)

When a property is materially damaged by fire, flood, or similar event, owners can file a catastrophic loss appeal outside the normal annual window. The relief is typically pro-rated for the portion of the year the property was uninhabitable. Filing requirements and timing are stricter than the annual appeal — confirm with the Allegheny County Office of Property Assessments immediately after the loss.

Best practices

Calendar March 31 every year your implied market value looks higher than what your home would sell for today.
Look up the current STEB-published Common Level Ratio for Allegheny County — that's the multiplier the board uses.
Pull three to five arm's-length sales from the same school district and ideally the same neighborhood, within the last 12 months.
Verify the Allegheny County property record online — square footage, year built, finished area errors are common and free to correct.
Attend the hearing officer's session in person or by phone — written-only submissions tend to underperform.

Common mistakes

Skipping the hearing officer step and going straight to BPAAR — you have to start at the informal level.
Bringing pre-2013 sales as comps. Base year is 2012 but evidence boards care about recent market behavior.
Submitting Zillow or Redfin estimates as evidence. Boards reject them; only recorded sales work.
Forgetting that the school district can file a reverse appeal after a sale. A high purchase price cuts against you.
Letting the deadline lapse because the assessment notice arrived late — confirm via the county portal.

Official Pennsylvania sources

Allegheny County Office of Property Assessments
Allegheny County's property assessment office and online search.
Allegheny County Board of Property Assessment Appeals and Review (BPAAR)
Hears Allegheny County property assessment appeals via hearing officers and the BPAAR board.
PA State Tax Equalization Board (STEB)
Publishes the annual Common Level Ratio (CLR) for every Pennsylvania county.
PA County Assessors — directory by county
Find your county assessor for property tax appeals.
Pennsylvania Bar Association — attorney lookup
Find or verify a Pennsylvania attorney.

Frequently asked questions

What is the Allegheny County property tax appeal deadline?

Allegheny County's annual appeal deadline is March 31. Catastrophic loss appeals have their own, separate timing tied to when the damage occurred. Always confirm the current year's deadline with the Board of Property Assessment Appeals and Review (BPAAR).

What's the difference between the hearing officer and BPAAR?

The hearing officer is the informal first step — a single officer reviews evidence and makes a recommendation. The BPAAR formal hearing is the second step, before the three-member board. Either side (owner or taxing authority) can appeal the hearing officer's recommendation to BPAAR.

What changed about the Common Level Ratio in Allegheny County?

Pennsylvania courts found in 2022 that Allegheny County had been using an artificially high predetermined ratio that didn't reflect actual sales-to-assessment data. The court required the county to use the STEB-published CLR. The CLR dropped dramatically, making appeals far more impactful for owners whose assessment-implied market value was higher than reality.

Will the school district appeal my assessment back up if I sell?

Pittsburgh-area school districts, particularly Pittsburgh Public Schools, frequently file reverse appeals after a property sells well above its 2012 base-year-driven assessed value. A recorded sale price is a powerful piece of evidence the taxing authority can use against you.

Do I need an attorney to appeal in Allegheny County?

For residential properties most owners file pro se at the hearing-officer level. Higher-value, commercial, or BPAAR-level cases — especially against a school district that has hired counsel — usually warrant a Pennsylvania-licensed attorney with Allegheny County property tax experience.

Next read

PA Common Level Ratio (CLR)

Allegheny appeals turn on the Common Level Ratio more than almost any other PA county. Understanding the CLR is essential.

SEO Quality Rating

How we currently rate this article. Updated as the content evolves.

Target keyword: allegheny county property tax appeal
Search intent: The user wants the step-by-step procedure for appealing an Allegheny County property tax assessment.

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Explanation

Strong Allegheny-specific coverage of the hearing officer / BPAAR two-step, the March 31 annual deadline, and the post-Cohen / Cone-Stewart CLR landscape. Very high local relevance.

Suggested improvements

Add expert review from an Allegheny County property tax attorney.
Add a worked example using the current STEB-published CLR.
Add downloadable BPAAR evidence packet checklist.

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