Delaware County, PA Property Tax Appeal Deadline 2026

In Pennsylvania the assessment on your bill is presumed correct until you prove otherwise — and the proof that counts is fair market value: recent sales of comparable homes around Upper Darby, Chester and Media (a sales-comparison, cost, or income analysis), not a list of other properties' assessed values.

Appeals go to the Delaware County Board of Assessment Appeals. There is no statewide deadline — each county sets its own annual cutoff, and missing it forecloses the annual appeal for that tax year. Delaware County's window: County-set annual deadline (commonly August 1 in Pennsylvania) — confirm with the county. Filing fee: Set by the county — check the board's current fee schedule.

How to appeal in Delaware County — step by step

1. 1

   Confirm your county's exact deadline

   Pennsylvania deadlines vary by county (commonly August 1, with different dates in Philadelphia and Allegheny County). The date on your assessment notice or the board's website controls — verify it before anything else.

2. 2

   Gather comparable sales

   Three to five recent sales of similar homes are the backbone of a residential appeal. The board presumes the current assessment is correct, so the burden of proving market value is on you.

3. 3

   File the written appeal on the county's form

   Each Pennsylvania county provides its own appeal form. Submit it to the Delaware County Board of Assessment Appeals before the deadline — a late annual appeal is out for the year.

4. 4

   Deliver your evidence in advance

   Boards commonly require written evidence a fixed number of days before the hearing (about 10 days is typical) and may require multiple paper copies — check your county's hearing rules when you file.

5. 5

   Present your case at the hearing

   Walk the board through your comparable sales and your conclusion about the home's fair market value. Evidence not provided in advance generally must be presented at the hearing itself — the board will not continue the hearing to accept late evidence.

6. 6

   Keep paying your tax bill

   An appeal does not pause collection. Pay on time; a reduction is applied after the board rules.

Frequently asked questions

• When is the deadline to appeal property taxes in Delaware County in 2026?

  Pennsylvania appeal deadlines are set county by county — for most counties the annual deadline is August 1, but your county's own date controls. Confirm Delaware County's exact 2026 deadline on your assessment notice or with the county Board of Assessment Appeals before filing.

• What does it cost to file?

  Set by the county — check the board's current fee schedule. Fees are set county by county in Pennsylvania, so double-check the board's current schedule when you file.

• What evidence actually works in a Pennsylvania appeal?

  Proof of fair market value — recent comparable sales, or a cost or income analysis. Pointing at other properties' assessed values is not the operative proof; the appellant bears the burden and the existing assessment is presumed correct.

• What if I miss the deadline?

  Missing the county's annual filing deadline forecloses the annual appeal for that tax year — the next chance is next year's window. Put the county's date on your calendar now.

More Pennsylvania county deadline guides

• Philadelphia County
• Allegheny County
• Montgomery County
• Bucks County
• Chester County
• Berks County