Montgomery County Property Tax Appeal — Deadline and How to File
The deadline
Filing deadline
August 1
per the Montgomery County Board of Assessment Appeals' annual appeal deadline notice, checked 2026-09-10 — source
Who hears it, and where it goes
Your appeal is decided by the Montgomery County Board of Assessment Appeals.
Where to file
Montgomery County Board of Assessment AppealsMontgomery County Courthouse
P.O. Box 311
Norristown, PA 19404-0311
The form: Assessment Appeal Form.
Filed by mail to the P.O. Box or by hand, UPS or FedEx at One Montgomery Plaza, Suite 301, 425 Swede Street, Norristown.
Not accepted by fax or by email.
A filing fee is due with the appeal.
Include three copies of any supporting documentation. USPS postmarks can be delayed, so the Board advises asking the Post Office counter for a hand-cancelled postmark, a Certificate of Mailing, or Registered or Certified Mail.
per the Montgomery County Board of Assessment Appeals' appeal instructions, checked 2026-09-10 — source
Nearby counties
- Bucks County — Bucks County Board of Assessment Appeals
- Philadelphia County — Board of Revision of Taxes
- Delaware County — Delaware County Board of Assessment Appeals
- Chester County — Chester County Board of Assessment Appeals
- Lehigh County — Lehigh County Board of Assessment Appeals
- Berks County — Berks County Board of Assessment Appeals
More: the county index and the Pennsylvania guide.
What your assessed value means here
Pennsylvania — assessed at a base-year value; the STEB Common Level Ratio for your county is about 29.76% of current market. Confirm the ratio on your notice (53 Pa.C.S. §8854).
Montgomery County's common level ratio is drawn from the 2025 CLR (2024 sales data; effective 7/1/2026–6/30/2027) table — the same figure the app uses to compare your assessment to current market value.
Can the board raise your assessment?
Yes. The Montgomery County Board of Assessment Appeals can raise your assessment on your own appeal, not only lower it. That is the risk you take by filing, and it is why the case has to be worth making before you file it.
What a board actually weighs
The Montgomery County Board of Assessment Appeals decides what your property was worth on the valuation date, so recent comparable sales carry the case, not the size of the bill. The Pennsylvania guide covers the evidence.
Common questions
- When is the deadline to appeal my property assessment in Montgomery County?
- The deadline is August 1 — per the Montgomery County Board of Assessment Appeals' annual appeal deadline notice, checked 2026-09-10.
- Who decides my appeal in Montgomery County?
- The Montgomery County Board of Assessment Appeals.
- Where do I send my appeal in Montgomery County?
- To the Montgomery County Board of Assessment Appeals, Montgomery County Courthouse, P.O. Box 311, Norristown, PA 19404-0311 — per the Montgomery County Board of Assessment Appeals' appeal instructions, checked 2026-09-10. The form is the Assessment Appeal Form.
Sources
Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.
PROppeal is coming soon for Montgomery County
When it launches, PROppeal will check your case against real, recent comparable sales and give you an honest verdict — then build the board-ready letter to file — $29.99, no percentage of your savings.
Want a heads-up when it’s live? Email [email protected].