Allegheny County's Common Level Ratio — the factor used to convert a home's assessed value back to its estimated market value for tax appeal purposes — dropped from 54.5% in 2025 to 50.1% in 2026. That's not a rounding footnote. It means the fraction of your home's value the county is actually taxing shifts year to year, and two identical houses can end up taxed on two different fractions of value depending on their appeal history.
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Talk to a Specialist →Allegheny County hasn't done a full countywide reassessment in years, so assessed values on record are increasingly disconnected from actual market value for any given property. The CLR exists specifically to let the county and property owners translate between the two — but because it's recalculated annually and applies uniformly to a county full of unevenly-aged assessments, it doesn't fix the underlying unevenness. It just gives you the year's official conversion factor.
If a neighbor successfully appeals their assessment down, their tax bill reflects a different, lower basis than yours — even on an otherwise identical house. Multiply that across a county where assessments haven't been comprehensively updated in years, and "compare the effective rate" stops being a clean exercise. Two nearly identical listings can carry meaningfully different tax bills for reasons that have nothing to do with the homes themselves, and everything to do with each owner's individual appeal history.
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| County | Effective rate | Annual tax, $500K home |
|---|---|---|
| Butler | ~1.4% | ~$7,000 |
| Washington | ~1.4%-1.6% | ~$7,500 |
| Beaver | ~1.5%-1.8% | ~$8,500 |
| Allegheny | ~2.0%-2.3%, plus appeal variance | ~$11,000, individually variable |
Crossing into Butler, Washington, or Beaver County sidesteps the CLR question entirely — those counties carry meaningfully lower nominal rates on top of not sharing Allegheny's assessment-currency problem. If you specifically want an Allegheny County community like Rose Ridge or Traditions of America at Richland, request the property's actual current assessed value and its appeal history, not just a generic "effective rate" pulled from a countywide average — the average is exactly the number the CLR complicates.
The honest way to shop this market: if you're set on Allegheny County, get the specific parcel's current assessment and appeal status in writing before comparing it to any other listing's tax bill — a countywide "effective rate" is a planning estimate here, not a number you can rely on property to property.
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