Montgomery County's annual assessment appeal deadline is August 1 of the year before the tax year under the Board's revised 2026 rules, making August 1, 2026 the deadline for a 2027 annual appeal. An interim appeal from a notice of assessment change has a separate 40-day period. The Board's current form requires parcel and ownership information, the existing assessment, the owner's opinion of market value, a reason for appeal, a signature, and the applicable fee. FairPath can organize a manual source and evidence file. It does not sign or submit the appeal, pay the county fee, supply an opinion of value, appear for the owner, or claim automated Montgomery County coverage.
Assessment context: Montgomery County maintains the assessment rolls, maps, and real-estate ownership registry. Begin with the official parcel number, municipality, school district, assessed land and improvements, property use, living area, age, construction, lot, condition, and change-notice history. Pennsylvania appeal analysis may use the county assessment ratio or state equalization framework when relating assessment to market value, so preserve the source and year of every ratio rather than applying a generic multiplier. Montgomery includes dense boroughs, older housing near Philadelphia, high-value Main Line communities, postwar suburbs, condominium projects, office and industrial corridors, and rural northern areas. Municipality, school district, site utility, transit access, property type, renovation, and condition can materially change comparison quality.
Filing process: Download the current Assessment Appeal Form and revised Board rules from the official county page. Identify whether the case is annual or interim, use the correct deadline, complete a separate form for each parcel, state the assessment appealed and owner opinion of value, sign the certification, and include the nonrefundable fee. The county FAQ identifies a $50 fee for a single-family residence or individually owned condominium, but verify the live schedule before payment. Montgomery warns that USPS postmarks may be delayed and recommends obtaining hand cancellation or a certificate of mailing at a Post Office counter. Retain the complete filed form, payment evidence, mailing proof or stamped receipt, and later hearing notice. Follow the 2026 rules for evidence, representation, and attendance rather than assuming submission of the form completes the case.
Evidence to review: Build a Montgomery residential record around comparable market transactions and verified physical facts. Record sale date, price, municipality, school district, neighborhood, type, living area, lot, age, basement, garage, renovation, condition, and transaction circumstances. Explain differences between a borough rowhouse, condominium, Main Line property, subdivision home, or rural parcel instead of relying on countywide price trends. Preserve the official property record and mark any disputed field. Dated photographs, inspections, permits, surveys, contractor scopes, and appraisals can support condition or factual issues when tied to market impact. Use any applicable county ratio consistently and show the calculation. Index the exhibits and retain the exact packet for the hearing because the signed appeal form alone is not the evidentiary presentation.
Current deadline guidance: Annual appeal for 2027 is due August 1, 2026; interim appeals are due within 40 days of the notice. Montgomery County's revised 2026 rules set August 1 of the year before the appealed year as the annual deadline. An interim appeal from a change notice must be filed within 40 days of the notice date. Because the annual deadline falls on a fixed date and the county warns of delayed USPS postmarks, owners should obtain reliable filing proof.
Montgomery's annual deadline is August 1 of the preceding year, while interim change notices create a separate 40-day deadline.
The county explicitly warns that delayed USPS postmarks can make a filing appear late and recommends hand cancellation or a certificate of mailing.
The 2026 form requires an original signature for an owner filing and requests an owner opinion of market value.
Montgomery's borough, Main Line, postwar suburban, condominium, commercial-corridor, and rural markets require municipality and property-type discipline.
Official filing authority: Montgomery County Board of Assessment Appeals. https://www.montgomerycountypa.gov/index.aspx?nid=464
Source: Montgomery County Government, Board of Assessment Appeals, https://www.montgomerycountypa.gov/index.aspx?nid=464. Reviewed 2026-07-16.
Source: Montgomery County Government, 2026 Appeal Rules and Regulations, https://www.montgomerycountypa.gov/DocumentCenter/View/1165/Appeal-Rules-and-Regulations-rev-2026?bidId=. Reviewed 2026-07-16.
Source: Montgomery County Government, 2026 Assessment Appeal Form, https://www.montgomerycountypa.gov/DocumentCenter/View/1158/Assessment-Appeal-Form-rev-2026?bidId=. Reviewed 2026-07-16.
Source: Montgomery County Government, Board of Assessment Appeals FAQ, https://montgomerycountypa.gov/faq.aspx?TID=37. Reviewed 2026-07-16.