Allegheny County has not conducted a countywide property tax reassessment since 2012, and every tax bill in the county still starts from that frozen base year. The gap between 2012 values and today’s market is now so wide that the county’s 2026 Common Level Ratio sits at just 50.14%, meaning the average assessment represents only about half of actual market value.1Allegheny County. BPAAR Frequently Asked Questions County Council introduced legislation in March 2026 calling for a full reassessment in 2028, with regular reassessments every three years after that, but passage is uncertain. Until a countywide reassessment actually happens, the only way to correct an inflated assessment on your own property is to file an annual appeal.
Why 2012 Still Controls Your Tax Bill
Pennsylvania allows counties to use “base year methodology.” Allegheny County’s base year is 2012: every property’s assessed value is anchored to its estimated market value as of January 1 of that year, and that figure first applied to the 2013 tax year.2Allegheny County. Property Assessments In theory, when every property is valued as of the same date, the system treats owners equally regardless of market swings afterward.
In practice, values haven’t stayed frozen uniformly. When a home sells, the county may reassess based on the sale price. Additions and renovations can trigger updates. And any owner, school district, or municipality can file an annual appeal to push a value up or down. The result is a patchwork. Some homes still carry their original 2012 numbers; others, especially recently sold properties, reflect something close to current market prices. Thirteen years in, neighbors with nearly identical houses can be paying wildly different taxes.
The Common Level Ratio and What It Means for You
The Common Level Ratio is the single most important number for anyone deciding whether to appeal. The State Tax Equalization Board calculates it each year by comparing a county’s base year assessments to actual sales data, and certifies the new ratio to each county before July 1.3Pennsylvania Department of Community and Economic Development. STEB/TED Frequently Asked Questions4Pennsylvania Department of Community and Economic Development. State Tax Equalization Board For 2026 in Allegheny County, that ratio is 50.14%.5Allegheny County. BPAAR Frequently Asked Questions
Translate that into dollars. If you bought a house for $300,000 and the county assessed it at or near that price, your assessment should be around $150,420 (50.14% of $300,000) to be in line with how long-held properties are taxed across the county. Anything higher means you are paying at a heavier rate than your neighbors whose assessments never moved after their last sale.
The ratio changes every year as the market shifts. An assessment that looked fair against last year’s CLR can become inflated against this year’s. If you own property in the county, this is the number to check annually.
Recent Buyers Pay the Steepest Price
A property that sold in 2012 for $180,000 might still carry that $180,000 assessment. A similar home nearby that sold in 2023 for $300,000 could be assessed at the full $300,000. The second owner pays taxes on roughly double the ratio-adjusted figure the first owner pays. The CLR exists to correct that gap, but only if the owner files an appeal.
The appeal process cuts both directions. School districts and municipalities regularly file their own appeals to raise the assessed value of properties they believe are undervalued, and recently sold homes are the obvious targets. The Pennsylvania Supreme Court has upheld districts’ right to selectively appeal recently sold properties without violating the state constitution’s Uniformity Clause, even when the district leaves unsold properties alone. So if you buy a home and the sale price reveals a large gap above the existing assessment, expect that your school district may move to bump the number up, sometimes before you’ve unpacked.
Filing Your Own Appeal
Allegheny County’s annual appeal window opens and closes in the year before the taxes are due, which catches many owners off guard. The window for 2026 tax year appeals closed on September 2, 2025.6Allegheny County. Property Assessments and Real Estate Miss it and you are locked into the current assessment for that tax year.
Filing costs a non-refundable $135.25.7Allegheny County. BPAAR Appeal Walk-In Form The form can go in online, by mail, or in person at the Department of Court Records in the City-County Building at 414 Grant Street in Pittsburgh. You will need your parcel identification number, and you’ll be asked whether you’re challenging the market value, the application of the CLR, or both.
Evidence decides outcomes. A professional appraisal from a certified Pennsylvania appraiser typically costs $400 to $600 and carries real weight. At a minimum, assemble three comparable sales of similar homes nearby that sold for less than the county’s value on your property. Physical defects not reflected in county records (foundation problems, an outdated roof) can further support a lower value; date your photos and get written repair estimates from licensed contractors.
The Hearing
Appeals go to the Board of Property Assessment Appeals and Review (BPAAR). Hearings are currently held by phone. Submit your evidence to the county and to any opposing parties at least ten days before the hearing, and provide a phone number at least five days ahead so the board can reach you. School districts and municipalities often send representatives to oppose reductions. If you don’t appear and haven’t requested a postponement in advance, your appeal is classified as withdrawn and you lose the challenge for that year.8Allegheny County. Appeals A written decision arrives by mail, typically within a few weeks to several months.
If You Lose at BPAAR
Either side can appeal BPAAR’s decision to the Allegheny County Court of Common Pleas through the Board of Viewers. The deadline is 30 days from the date BPAAR mails its disposition letter, not from the date you receive it. Another $135.25 filing fee applies, payable by credit or debit card online, or by business check or money order by mail.9Allegheny County. Appealing BPAAR Decision This stage is more formal, and for properties with real money at stake it’s worth consulting a property tax attorney. Filing does not pause collection; you keep paying based on the current assessment, and any overpayment is refunded if you win.
The 2028 Reassessment Proposal
The 2012 reassessment happened because a judge ordered it, not because the county volunteered.1090.5 WESA. Allegheny County Council Seeks Public Feedback on Potential Countywide Property Reassessments For more than a decade since, the county has stuck with the individual appeal process rather than ordering another countywide reset. The strain shows in the CLR, which has fallen from the 80s a decade ago to 50.14% today.
In March 2026, Allegheny County Council members introduced legislation calling for a countywide reassessment in 2028, followed by reassessments every three years. The bill was referred to council’s committee on assessment practice, and public hearings have been scheduled. Whether it passes is unsettled. Reassessment is politically unpopular because it creates visible shifts in individual tax bills, even when total revenue is held flat.
What a Reassessment Would Actually Do
The biggest fear around a reassessment is that every owner’s taxes will spike overnight. Pennsylvania law has guardrails against that. When a countywide reassessment occurs, each taxing body must calculate an “equalizing millage,” a new rate that produces the same total revenue it collected the year before reassessment, excluding new construction.11Allegheny County Controller. Property Tax Windfall Watch The specific limits:
- Municipalities can raise the equalizing millage by up to 5% with a separate vote. Going higher requires a public petition to the Court of Common Pleas and a showing of good cause.11Allegheny County Controller. Property Tax Windfall Watch
- School districts must also set an equalizing millage and may exceed it only within an inflationary index set by the state, generally around 2%.11Allegheny County Controller. Property Tax Windfall Watch
- Allegheny County government, under a 2005 ordinance, is prohibited from any windfall and must keep property tax revenue completely neutral.11Allegheny County Controller. Property Tax Windfall Watch
A reassessment reshuffles who pays what; it does not automatically raise the total collected. Owners of properties that appreciated faster than the county average would see their share rise, while owners of properties that lagged would see a decrease. If a reassessment goes forward, every property gets a new assessed value tied to current market conditions and the base year resets. The CLR would return to or near 100%, then begin drifting again as the market moves. Preventing that long slow drift is the point of the three-year cycle in the proposed bill.
Until any of that happens, the system in place is the one you have to work with. Check your assessment against this year’s CLR, watch for the next appeal window, and gather your evidence early.