You're over-assessed when the County's value is higher than what your home would actually sell for — and then you're over-paying every year until you appeal. Philadelphia's formal market-value appeal to the Board of Revision of Taxes is due the first Monday in October; a separate, earlier First Level Review (FLR) is also available. Confirm both windows with the BRT.
Live Philadelphia County parcels whose assessed market value exceeds their recent arm's-length sale price — a real over-assessment signal pulled from the public assessor roll. If your parcel looks like these, you have a strong appeal:
| PIN | Use | Recent sale | County says mkt | Over | Indic. overpay |
|---|---|---|---|---|---|
| 8814••• | COMMERCIAL | $10,000,000 | $19,505,100 | 1.95× | ~$133,071/yr |
| 8815••• | APARTMENTS > 4 UNITS | $7,000,000 | $12,000,000 | 1.71× | ~$70,000/yr |
| 8827••• | COMMERCIAL | $2,750,000 | $4,442,000 | 1.62× | ~$23,688/yr |
| 7782••• | COMMERCIAL | $650,000 | $1,492,900 | 2.3× | ~$11,801/yr |
| 7725••• | COMMERCIAL | $1,190,138 | $2,023,900 | 1.7× | ~$11,673/yr |
| 8820••• | COMMERCIAL | $735,000 | $1,563,000 | 2.13× | ~$11,592/yr |
| 8824••• | COMMERCIAL | $1,300,000 | $2,041,800 | 1.57× | ~$10,385/yr |
| 8848••• | INDUSTRIAL | $700,000 | $1,372,700 | 1.96× | ~$9,418/yr |
Most owners who win use a contingency property-tax appeal firm — it costs nothing unless they cut your bill, then takes a share of the first-year saving. About 95% of over-assessed owners never appeal, so the saving is usually left on the table.
Open the official Philadelphia County appeal page → Confirm the official deadline →against the official Philadelphia County / PA deadline (phila.gov · 53 Pa.C.S. §8844). These are public deadline facts, not legal or tax advice — confirm your exact date with the Philadelphia Board of Revision of Taxes (BRT) and consult a professional before filing.
More for Philadelphia County: how to lower Philadelphia taxes · Philadelphia property tax appeal.