Everyone wants a number: what are my odds? But an honest answer isn't a percentage — it's a description of what actually moves a decision. Here's what determines whether a Philadelphia appeal succeeds, and how much of it is in your hands.
You'll see confident-sounding statistics floating around — this share of appeals win, that share fail. Ignore them. A blanket percentage tells you nothing about your case, because an appeal isn't a lottery draw. It's a decision about one property, weighed on the specific evidence you bring. Two homes on the same block can get opposite outcomes for the simple reason that one owner showed up with strong comparable sales and the other showed up with a hunch. Averaging those together into a headline number would be worse than useless — it would mislead you about what to do.
So the useful question isn't "what percent win?" It's "what makes a case win?" That, unlike a success rate, has a real answer — and most of it is within your control.
When the Board of Revision of Taxes or an OPA reviewer looks at your appeal, a handful of things carry the weight:
The owners who win aren't the ones with the biggest complaint. They're the ones who file a well-evidenced, realistic request, on time and in the right format.
The failure modes are the mirror image of the above, and they're common:
Notice that none of these are about luck. They're about preparation. Which is the encouraging part: the levers that decide outcomes are almost entirely the ones you control.
Three things separate a case that's ready from one that isn't, and you own all three. First, the evidence — assembling comparable sales that actually hold up and documenting any condition or record issues; our guide on what evidence you need lays out exactly what to gather, and how to find comparable sales that win covers the hardest part in depth. Second, a realistic requested value that follows cleanly from that evidence. Third, filing on time and in the right format. Do those three well and you've given yourself the best chance the facts allow. That's the honest ceiling: strong preparation maximizes your odds, but it can't manufacture a gap that isn't there — and if the evidence shows your assessment is fair, the right move is not to file.
If your case does reach a hearing, presenting it calmly and clearly matters too, though it's more about clarity than performance. We walk through what that room is like in what to expect at a BRT hearing.
No tool, lawyer, or consultant can guarantee an appeal will win — anyone who promises otherwise is overselling. What you can do is stack the odds by bringing genuinely comparable evidence, asking for a value your evidence supports, and filing correctly and on time. That's why the do-it-yourself path works so well for straightforward residential appeals: the deciding factor is the strength of the case, not who carries it into the room. Our guide to appealing without a lawyer makes that case in full.
TaxAssessmentIQ focuses on the one input that decides outcomes: evidence. It pulls your live OPA record, finds real comparable sales, and shows you whether the gap is strong enough to be worth filing — so you're not guessing about the quality of your comps. If the case is there, it builds a Board-ready packet with a realistic requested value, formatted the way the process expects. It won't promise you a win, because nothing honestly can. What it does is make sure that if the evidence is on your side, your filing shows it clearly.
There is no single number that predicts your outcome, and any headline percentage would be misleading because every appeal turns on its own evidence. Whether a given appeal succeeds depends on the strength of that specific case, not on an average across everyone else.
The comparability and recency of the sales you present, documented condition issues or factual errors in your record, and whether the value you are requesting is realistic. A well-evidenced, reasonable request is far more persuasive than a large one you cannot support.
Thin or mismatched comparables, an unrealistic requested value, unaddressed errors, and missing the deadline or required format. Any one of these can undercut a case that might otherwise have merit.
Yes. The parts within your control are the quality of your evidence, the realism of your requested value, and filing on time in the correct format. Owners who do those three things well give themselves the best chance the facts allow.
For a straightforward residential appeal, the deciding factor is the evidence, not who presents it, and owners can file well on their own. Professional help matters more for complex commercial cases. No tool or representative can guarantee an appeal will win.
TaxAssessmentIQ gives you a free, honest verdict from the City's own recorded sales — just enter your address, no sign-up and no account. If your home looks over-assessed, you can get a ready-to-file appeal packet for a flat, one-time price, backed by a money-back guarantee. If it isn't worth filing, we tell you that too — for free, before you pay anything.
Free in public beta — no charge to check your assessment or build your packet.