Warren County's ordinary 2026 property-assessment appeal period is closed. The regular deadline was April 1, subject to the later-of-45-days-from-bulk-mailing rule and the May 1 rule for a municipality implementing a revaluation or reassessment. Warren published 2026 appeal hearing dates on April 28, April 29, and May 5. The $249 FairPath owner-guided evidence packet remains available now for every Warren County property. It can organize the municipal record, Chapter 123 ratio analysis, owner-selected comparable sales, photographs, condition records, and the official A-1 petition instructions. A closed filing window changes procedural guidance, not access to the packet. FairPath does not submit the petition, pay the county fee, select the owner's asserted true value, testify, or represent the owner.
Assessment context: Identify the municipality, block, lot, qualifier, property class, land assessment, improvement assessment, total assessment, and October 1 valuation condition from the official record and annual notice. Warren's Board maintains the MOD-IV taxation system with its municipalities and publishes municipal rates and ratios. Those municipal ratios matter because New Jersey's Chapter 123 test compares the assessment-to-true-value relationship with the taxing district's common-level range. Depending on the value proven and the applicable ratio, an appeal can produce a reduction, no change, or an increase. The petition instructions emphasize that the appeal concerns property value, not the amount of taxes. A recent purchase may be relevant, but the owner should document whether the sale was arm's length and how the property's condition and characteristics compare with other transactions.
Filing process: Use Warren County's current A-1 petition without altering the prescribed form. File a separate petition for each taxed parcel unless the Tax Administrator approves consolidation. The original signed petition and filing fee go to the County Board; copies with all attachments go to the municipal assessor and municipal clerk, and the petitioner keeps a copy. The form offers in-person, virtual when the county offers it, and summary-hearing choices. A summary hearing is decided on the submitted evidence without the owner's appearance, so the written explanation must stand on its own. Taxes and municipal charges through the first quarter generally must be paid for the appeal to proceed. Legal entities and appraisal testimony have separate representation and witness requirements under the instructions. If the County Board judgment remains disputed, the petition explains the separate 45-day Tax Court period.
Evidence to review: Warren's instructions allow no more than five comparable sales and require any comparables not included with the petition to reach the assessor, municipal clerk, and County Board at least seven calendar days before the hearing. Record each sale's block, lot, price, deed date, property type, location, living area, lot, age, style, and condition, then explain material differences. The instructions treat comparable sales as market-value evidence and reject comparable assessments as proof of value; assessment-uniformity calculations should therefore be organized separately and tied to the municipal ratio. Photographs, surveys, cost information, inspection findings, and repair documentation can explain conditions the record misses. An owner relying on an appraisal must provide the required copies at least seven days before the hearing, and both the appraiser and taxpayer must appear. Income-producing property carries a separate income-and-expense disclosure.
Current deadline guidance: 2026 regular appeal window closed: April 1. Warren County uses New Jersey's April 1 regular deadline, or 45 days after the taxing district completes bulk mailing of assessment notices when that date is later. A municipality implementing a revaluation or reassessment uses May 1. Petitions must be received, not merely postmarked. The ordinary 2026 window has passed; an owner relying on a later notice must confirm the parcel-specific date with the Board.
Warren published three 2026 tax-appeal hearing dates: April 28, April 29, and May 5.
The original petition must be received rather than merely postmarked, and complete copies must also be served on the municipal assessor and clerk.
The petition offers a summary-hearing option decided only from submitted evidence, but appraisal evidence still requires the appraiser and taxpayer to appear.
Warren limits comparable-sale submissions to five and requires the three-recipient evidence exchange at least seven calendar days before the hearing.
Official filing authority: Warren County Board of Taxation. https://www.warrencountynj.gov/government/tax-board
Source: Warren County, New Jersey, Warren County Board of Taxation, https://www.warrencountynj.gov/government/tax-board. Reviewed 2026-07-29.
Source: Warren County Board of Taxation, Petition of Appeal Form A-1 and Instructions, https://www.warrencountynj.gov/home/showpublisheddocument/8572/638507746036070000. Reviewed 2026-07-29.
Source: Warren County Board of Taxation, 2026 Tax Appeal Meeting Dates, https://www.warrencountynj.gov/home/showpublisheddocument/13359/639114171093770000. Reviewed 2026-07-29.
Source: New Jersey Division of Taxation, Assessment and Appeals, https://www.nj.gov/treasury/taxation/lpt/lpt-appeal.shtml. Reviewed 2026-07-29.