How Allegheny County Property Tax Actually Works
Pennsylvania counties set their own assessment systems. Allegheny County uses a base-year system — properties are assessed at market value as of a specific base year, not continuously updated to current market value. The county then certifies an annual Common Level Ratio (CLR) that reflects the relationship between assessed values and current market values.
Your actual tax bill = Assessed Value × (County Millage + School District Millage + Municipal Millage).
The CLR doesn't appear on your bill — it's used in assessment appeals to determine whether you're being taxed fairly relative to your current market value.
The 2026 CLR is 50.1%, down from 54.5% in 2025. This means the State Tax Equalization Board has certified that Allegheny County assessed values are, on average, 50.1% of current market values.
What this means for you: If you buy a $490,000 home and Allegheny County assesses it at $270,000, check whether that's within 15% of the CLR-indicated value ($490,000 × 50.1% = $245,490). If the assessment exceeds $245,490 × 1.15 = $282,313, you may have grounds to appeal. File within 40 days of the assessment notice.
Millage Rates by Community (2025)
Your total tax rate combines county, school district, and municipal millage. These vary by municipality within Allegheny County.
| Area | County Mills | School District Mills (approx.) | Municipal Mills (approx.) | Total Mills |
|---|---|---|---|---|
| Allegheny County (County portion only) | 6.43 | — | — | 6.43 |
| Hampton (near Richland) | 6.43 | ~18.0 | ~3.5 | ~27.9 |
| Richland Township | 6.43 | ~19.0 | ~4.0 | ~29.4 |
| Economy Boro (Beaver Co., for reference) | ~4.0 | ~17.5 | ~3.5 | ~25.0 |
| Cranberry Township (Butler Co., for reference) | ~3.0 | ~17.5 | ~3.0 | ~23.5 |
Millage rates change annually. Verify with each county and municipality's assessment office before purchase.
Senior Tax Programs — What Actually Exists
Act 77 — Allegheny County Senior Discount
✓ EXISTS (Allegheny County Only)A 30% flat discount on the Allegheny County portion of property taxes for qualifying senior homeowners.
Act 50 — Allegheny County Homestead Exclusion
✓ EXISTS (Allegheny County Only)Reduces the assessed value by $18,000 for purposes of calculating Allegheny County property tax. Not age-restricted — available to all owner-occupied primary residences.
PA Property Tax/Rent Rebate (PTRR)
✓ EXISTS (Statewide)Annual state rebate of up to $1,000 for qualifying homeowners 65+. Expanded by Act 7 of 2023. Applies regardless of which county you live in.
Statewide Senior Property Tax Freeze
✗ DOES NOT EXISTPennsylvania does not have a statewide senior property tax freeze. The PA Constitution's Uniformity Clause (Article VIII §1) prohibits age-based differential tax treatment. Local freezes exist in extremely few Pennsylvania municipalities. Do not plan your retirement finances around a freeze that does not exist.
How to Calculate Your Actual Allegheny County Tax Bill
Step 1: Find the current assessed value of the property at the Allegheny County Real Estate Portal (alleghenyassessor.com).
Step 2: Multiply assessed value × total millage rate for the specific municipality. Convert mills to percentage (1 mill = 0.001).
Step 3: Verify the municipality's millage at the Allegheny County Assessment Office — millage tables are published annually.
Step 4: Check whether any Act 50 homestead exclusion is currently applied. If not, subtract $18,000 from assessed value before multiplying by county millage.
Step 5: If buying at a price above current assessed value, check whether a reassessment is likely and what the resulting tax would be.