AssessCheck

New Jersey Property Tax Deadlines

New Jersey runs one of the most compressed calendars on this site: the value is set the October 1 before the tax year, and the appeal deadline — April 1, filed and received — lands just six months later. Everything that follows (hearings, judgments, the Tax Court window) happens before most of the year’s bills are even paid.

October 1: the valuation date

New Jersey values property annually as of OCTOBER 1 of the prior year — the added/omitted mechanism exists precisely because improvements made after October 1 enter the roll later, as a separate added assessment. The assessment on the bill is the assessor's determination of FULL market value; New Jersey has no year-over-year value cap. The county tax boards and the Tax Court run on a statewide calendar set by the Division of Taxation.

Anchor: October 1 of the prior year, the statutory valuation date for the following tax year · Basis: rule tied to an event

April 1: filed and received

A petition of appeal (Form A-1 with the A-1 Comp. Sale attachment) must be filed and RECEIVED by APRIL 1 with the County Board of Taxation — or with the Tax Court directly for assessments over $1,000,000. Two statewide variations: MAY 1 where the municipality undertook a revaluation or reassessment, and JANUARY 15 in Burlington, Gloucester and Monmouth Counties, which follow an alternative assessment calendar. The burden is on the petitioner to prove the assessment does not fairly represent market value or the common level range.

Anchor: April 1 of the tax year (filed AND received by that date) · Basis: fixed date

The certified average ratio and the ±15% band

New Jersey's distinctive mechanism is the Chapter 123 test: the Division of Taxation certifies an AVERAGE ASSESSMENT RATIO for each taxing district each year, and the COMMON LEVEL RANGE is that ratio plus or minus 15%. An assessment outside the range is presumptively excessive or discriminatory, and the court or board adjusts it to the range — while an assessment inside the range stands unless the owner proves the value itself is wrong. This is a different argument from a pure market-value appeal: a 35% assessment ratio with a ±15% band tolerates assessments from 20% to 50% of market before Chapter 123 even engages.

Anchor: the average ratio certified annually for each taxing district by the Division of Taxation · Basis: rule tied to an event

45 days to the Tax Court

A taxpayer dissatisfied with a County Board of Taxation judgment may appeal to the Tax Court of New Jersey within 45 DAYS of the judgment's date. Assessments over $1 million (or added/omitted aggregates over $750,000) skip the county board entirely and start in the Tax Court.

Anchor: the date of the County Board of Taxation's judgment · Basis: rule tied to an event

The shape of a year (illustrative)

Illustrative sequence for tax year 2026 — confirm your municipality’s status (revaluation or not, which county) each year.

  1. October 1, 2025: valuation date — the assessment for tax year 2026 is set.
  2. January 15, 2026: the deadline if you are in Burlington, Gloucester, or Monmouth County.
  3. February 2026: assessment notices confirm the number; the ratio screen tells you which standard to argue.
  4. April 1, 2026: Form A-1 filed and received by the county board — or May 1 in a revaluation municipality.
  5. Spring–summer 2026: county board hearings; the certified average ratios are published for the year.
  6. Within 45 days of the judgment: the Tax Court window, if the board’s result is not acceptable.
  7. August 2026 (illustrative): the tax bill arrives — computed on the appealed value if the judgment landed first.
  8. December 1, 2026 (typically — confirm with your county board): the added/omitted assessment deadline for improvements made after the prior October 1.

What this tells you: the April 1 deadline governs the whole year’s opportunity. New Jersey has no second window for regular appeals — miss April and the next chance is next April, for the next tax year.

What it does not tell you: whether your municipality revalued this year (moving your deadline to May 1) and your county board’s hearing calendar — both published by the county boards and the Division.

Where the processes are explained

Sources