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 |
|---|---|---|---|---|---|
| 8810••• | COMMERCIAL | $30,000,000 | $77,366,400 | 2.58× | ~$663,130/yr |
| 8814••• | COMMERCIAL | $10,000,000 | $19,700,100 | 1.97× | ~$135,801/yr |
| 8841••• | INDUSTRIAL | $12,637,226 | $20,844,400 | 1.65× | ~$114,900/yr |
| 8848••• | INDUSTRIAL | $2,800,000 | $5,898,200 | 2.11× | ~$43,375/yr |
| 8829••• | COMMERCIAL | $2,300,000 | $5,233,000 | 2.28× | ~$41,062/yr |
| 8827••• | COMMERCIAL | $2,750,000 | $5,607,100 | 2.04× | ~$39,999/yr |
| 8821••• | COMMERCIAL | $1,125,000 | $3,220,200 | 2.86× | ~$29,333/yr |
| 8820••• | COMMERCIAL | $2,600,000 | $4,620,000 | 1.78× | ~$28,280/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.