Pennsylvania Property Tax Appeal | 2026 Guide

Pennsylvania is the only state that does not require periodic countywide reassessments. Instead, 53 Pa.C.S. §8842(a) lets a county adopt a base-year market value — the values established in its most recent countywide reassessment — and continue using them year after year without updating to current market value.

Why base years drift so far from reality. Because there is no reassessment mandate, many counties have base years that are decades old. Reported examples range from counties last reassessed in the 1960s to others reassessed only recently. The longer the gap, the more individual assessments diverge from what homes actually sell for today — which is exactly why appeals work.

How the base year and the CLR interact. Your assessment is stated in base-year dollars, not today's dollars. To make a base-year assessment comparable to a current sale price, the State Tax Equalization Board publishes a Common Level Ratio (CLR) each year. On appeal, the board determines your property's current market value and applies the CLR (when it varies from the predetermined ratio by more than 15%, per §8842(b)) to translate that into the correct base-year assessment.

What this means for your appeal. Don't compare your assessment directly to recent sale prices — they're in different units. Instead, take your current market value, multiply by the county CLR, and compare the result to your assessed value. If your assessment is higher than market value × CLR, you are over-assessed.

Note on spot reassessment. A county may not single out your property for a fresh reassessment outside a countywide program; 53 Pa.C.S. §8843 prohibits "spot reassessment." Routine changes for new construction or improvements are handled separately as interim assessments.

Pennsylvania does not require counties to reassess on a schedule, so most counties tax off an old "base year." The Common Level Ratio (CLR) is the bridge between that stale base-year number and today's market. It is the ratio of assessed value to current market value, calculated each year by the State Tax Equalization Board (STEB) from county sales-ratio studies and certified to county assessors before July 1.

How the CLR controls an appeal. Under 53 Pa.C.S. §8842(b), the board first finds your property's current market value as of the date the appeal was filed, then applies the county's established predetermined ratio to that value — unless the CLR last published by STEB varies by more than 15% from the predetermined ratio, in which case the board must apply the CLR instead. In counties with old base years, the CLR is usually far below the predetermined ratio, so the CLR controls.

Why it wins appeals. If your home would sell for $300,000 and the county CLR is 50%, your assessment should be about $150,000. If the county currently assesses you at $200,000, that implies a market value of $400,000 at the same ratio — clear grounds for a reduction. The CLR converts your evidence of market value into the correct assessed value automatically.

Key 2026 fact: Allegheny County's CLR dropped to 50.14% for 2026 (from 54.5%), per STEB — meaning a homeowner now needs less of a market-value gap to win. Each county has its own CLR; check STEB's annual certification for yours. Bring recent comparable sales or a current appraisal as your market-value evidence, and let the CLR do the rest of the math.

The Court of Common Pleas is the judicial stop after you exhaust the administrative appeal at the county board.

When and where to file. After the county Board of Assessment Appeals (in Philadelphia, the BRT; in Allegheny, BPAAR then the Board of Viewers) issues its decision, you typically have 30 days to appeal to the Court of Common Pleas for that county. The appeal is heard de novo, meaning the court takes fresh evidence and decides the property's market value independently — it does not merely review the board for error.

What the court decides. The court determines the property's current fair market value, then applies the Common Level Ratio under 53 Pa.C.S. §8842(b) to set the assessment — the same equalization mechanic used at the board level. Both sides usually present appraisal evidence; in many counties an owner is wise to have a certified appraisal at this stage.

County-specific routing:

• Allegheny County: appeals run BPAAR -> Board of Viewers (de novo) -> a judge of the Court of Common Pleas. The Board of Viewers step is built into the court process and must be used before a judge hears the matter.
• Philadelphia: appeals run BRT -> Court of Common Pleas (Philadelphia County).

After Common Pleas. A Common Pleas decision can be appealed to the Commonwealth Court of Pennsylvania, and ultimately the Pennsylvania Supreme Court, on legal grounds.

Practical note: the 30-day window is unforgiving, and judicial appeals carry filing requirements and often appraisal costs. For most homeowners the board level resolves the matter; escalate to Common Pleas when the dollars at stake justify an appraisal and the board got the value clearly wrong.

Pennsylvania's annual appeal is forward-looking, but the law also lets the county adjust your assessment during the year when the property itself changes — and that change comes with its own appeal right.

When an interim assessment happens. Under 53 Pa.C.S. §8817, the assessor may change the assessed valuation when a parcel is subdivided, when physical changes are made (new construction, or the removal or alteration of existing improvements), when a catastrophic loss occurs, or when there is a change in use. New buyers and owners who pull building permits for additions are the most common recipients of an interim notice.

Your appeal right resets. An interim assessment isn't a quiet adjustment you have to accept. The county must send you a notice, and you get a fresh window to appeal that specific change — commonly around 40 days from the date the interim notice is mailed, separate from the regular annual September deadline. This matters because the annual deadline may already have passed when your interim notice arrives.

**What it is not. An interim assessment for genuine physical change is different from a prohibited "spot reassessment." 53 Pa.C.S. §8843 forbids a county from singling out an unchanged property for a one-off reassessment to capture market appreciation. If your value jumped without any physical change to the property, that may be an unlawful spot reassessment worth challenging.

How to respond.** Read the interim notice for its stated appeal deadline (don't assume the annual date applies), confirm the added value reflects only the actual improvement — not a fresh valuation of the whole property — and apply the Common Level Ratio to test whether the new total assessment overstates your home's market value. File the interim appeal within the notice's window to preserve the year.

Because Pennsylvania is the only state without a reassessment mandate, the year your county last did a countywide reassessment — its base year — varies enormously. Some counties last reassessed in the 1960s; others have completed recent reassessments. There is no single statewide schedule.

Why the base-year age is the appeal opportunity. When a county freezes values for decades under 53 Pa.C.S. §8842, neighborhoods appreciate at different rates while the base-year assessments stay fixed. The result is widening unfairness between similar homes. The State Tax Equalization Board's annual Common Level Ratio measures how far, on average, base-year assessments have fallen below current market value — and a low CLR signals a stale base year ripe for appeals.

How to find your county's base year and reassessment status. Check your county assessment office's official website, which states the base year used and whether a reassessment is underway. A handful of counties periodically announce new countywide reassessments, which reset everyone's values and often trigger a wave of appeals from owners whose new numbers overshoot.

Two examples of distinct county systems:

• Allegheny County continues to rely on a 2012 base year, adjusting toward current value through the CLR (50.14% for 2026). See Allegheny County.
• Philadelphia reassesses far more frequently than most counties, with countywide reassessments in recent years; appeals run through the Board of Revision of Taxes.

Bottom line: if your county's last reassessment is old, don't assume your frozen number is fair. Pull your county's current CLR, estimate your true market value, and run the comparison — old base years are where over-assessment hides.

Philadelphia gives homeowners two separate ways to challenge an assessment, and they are not the same thing.

First Level Review (FLR) — informal, run by the OPA. When the Office of Property Assessment issues a Notice of Proposed Valuation, it includes an FLR request form. The FLR is an informal reconsideration: an OPA evaluator re-examines your property's data and value. It is the low-effort first step, but it is optional — you do not have to complete an FLR before appealing, and the FLR deadline is set by the date on your notice (typically a set number of days after the notice is mailed).

Formal appeal — binding, decided by the BRT. A formal market-value appeal goes to the independent Board of Revision of Taxes (BRT). This is the statutory appeal, and it must be filed by the first Monday in October of the year before the tax year — October 5, 2026 for tax year 2027. The BRT holds a hearing and issues a binding decision.

You can do both. Requesting an FLR does not preclude a BRT appeal, and the city advises homeowners not to wait for the FLR result before filing with the BRT — because the two run on different clocks and the BRT deadline is firm. File the FLR for a quick informal fix, and file the BRT appeal in parallel to protect the hard October deadline.

After the BRT. If the BRT denies your appeal, you may appeal to the Pennsylvania Court of Common Pleas (Philadelphia County), which hears the matter de novo.

Practical rule: treat the FLR as a bonus shot, not your safety net. The first-Monday-in-October BRT filing is the deadline that actually preserves your right to a binding decision and a court appeal.

Unlike states where you appeal the bill you just received, Pennsylvania's annual appeal is forward-looking. The deadline set in 53 Pa.C.S. §8844(c) — on or before September 1, or a county-designated date no earlier than August 1 — governs the assessment used for the following tax year. An appeal filed in the late summer of 2025 sets your assessed value for the 2026 county, municipal, and school taxes.

Why it works this way. Counties certify assessment rolls before the tax year begins so that every taxing body — county, municipality, and school district — can set its millage rate against a final number. The statute requires appeals to be heard by October 31 and decisions mailed by November 15, leaving time for the certified roll to feed into the next year's bills.

What this means for you. Even if your current bill already looks too high, the relief from a successful annual appeal generally applies going forward, not retroactively to the bill in hand. To fix the current year you usually need a different path — an interim or special appeal tied to a specific notice (new construction, a catastrophic loss, or a correction), which carries its own short deadline.

County variations:

• Allegheny County sets a specific annual-appeal window each year (July 1 through early September for the 2026 tax year), administered by BPAAR. Confirm the current window at Allegheny County.
• Philadelphia requires a Board of Revision of Taxes market-value appeal by the first Monday in October of the year preceding the tax year.

Because the filing year and the tax year differ, mark next year's deadline as soon as you receive any change-of-value notice — waiting for the actual bill is usually too late.

Pennsylvania is one of the few states where a **taxing body can appeal to raise your assessment — a so-called "reverse appeal," most often filed by a school district chasing extra revenue after a property sells for more than its assessed value.

The statutory right. 53 Pa.C.S. §8855 gives a school district or other taxing district the right to appeal any assessment within its jurisdiction "in the same manner, subject to the same procedure and with like effect" as an owner's appeal. On its face, that lets a district file against your property.

The constitutional limit.** The right is sharply constrained by the Pennsylvania Constitution's Uniformity Clause. In Valley Forge Towers Apartments N, LP v. Upper Merion Area School District (2017), the state Supreme Court held that a taxing authority may not selectively appeal assessments based on a property's classification — for example, targeting only commercial properties or only recently sold homes — because all property in a taxing district is a single class entitled to uniform treatment. The Court reaffirmed and applied these uniformity limits to selective reverse appeals again in 2026.

What this means for you. A school district can still file a reverse appeal, but it must do so in a way that complies with uniformity — it cannot run a program that cherry-picks recent sales while ignoring comparable un-sold properties. If you're hit with a reverse appeal, two defenses are worth raising: (1) whether the district's appeal program is unconstitutionally selective under Valley Forge, and (2) whether the Common Level Ratio applied to your actual market value still supports a lower number than the district seeks.

Bottom line: a recent purchase above your assessed value can attract a school-district appeal, but the district must play by uniformity rules — and you have standing to challenge a selective program.

The State Tax Equalization Board (STEB), administered by the Pennsylvania Department of Community and Economic Development, is the agency that keeps Pennsylvania's wildly uneven county assessments comparable. It was created in 1947 to equalize values across counties for distributing state school subsidies — its primary statutory job is to determine the aggregate market value of taxable real property in every county and school district.

How STEB makes the number you'll use. Each year STEB runs a sales-ratio study for each county: it compares actual sale prices to the county's assessed values and computes the arithmetic median of those ratios. That median is the Common Level Ratio (CLR) — the typical assessed-to-market-value relationship in that county. STEB must publicly disclose its methodology in the Pennsylvania Bulletin and certify the ratios to county assessors before July 1.

Why it matters in your appeal. Under 53 Pa.C.S. §8842(b), when STEB's published CLR varies by more than 15% from the county's established predetermined ratio, the appeal board must apply the CLR to your proven market value. In counties that haven't reassessed in decades, the CLR is the only thing keeping assessments tethered to reality — and it is your strongest single piece of leverage.

Use it like this: look up your county's current STEB CLR, establish your home's true market value with recent comparable sales or an appraisal, and multiply. If the county's assessment implies a higher market value than yours at the same ratio, you have a uniformity-based reduction argument. The CLR is published data — neither you nor the county can dispute the ratio itself, only the market value to which it applies.